OTTER TAIL CORP
BIG STONE II POWER PLANT OPERATION & MAINTENANCE SERVICES AGREEMENT
<DOCUMENT>
<TYPE>EX-10.2
<SEQUENCE>3
<FILENAME>c97507exv10w2.htm
<DESCRIPTION>BIG STONE II POWER PLANT OPERATION & MAINTENANCE SERVICES AGREEMENT
<TEXT>
<HTML>
<HEAD>
<TITLE>exv10w2</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
<!-- PAGEBREAK -->
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>
<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Confidential information has been omitted from this Exhibit and filed separately with the
Commission pursuant to a confidential treatment request under Rule&nbsp;24b-2.</B>
</DIV>


<DIV align="right" style="font-size: 10pt; margin-top: 12pt"><B>Exhibit&nbsp;10.2</B>
</DIV>


<DIV align="center" style="font-size: 18pt; margin-top: 6pt"><B>BIG STONE II POWER PLANT</B></DIV>


<DIV align="center" style="font-size: 24pt; margin-top: 6pt"><FONT style="font-variant: SMALL-CAPS"><B>Operation &#038; Maintenance</B></FONT></DIV>


<DIV align="center" style="font-size: 24pt; margin-top: 6pt"><FONT style="font-variant: SMALL-CAPS"><B>Services Agreement</B></FONT></DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><FONT style="font-variant: SMALL-CAPS"> <B>By and Among</B></FONT>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><B>CENTRAL MINNESOTA MUNICIPAL POWER AGENCY,</B><BR>
</DIV>
<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><B>GREAT RIVER ENERGY,</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><B>HEARTLAND CONSUMERS POWER DISTRICT,</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><B>MONTANA-DAKOTA UTILITIES CO., A DIVISION OF MDU<BR>
RESOURCES GROUP, INC.,</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><B>OTTER TAIL CORPORATION dba OTTER TAIL POWER<BR>
COMPANY,</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><B>SOUTHERN MINNESOTA MUNICIPAL POWER AGENCY, AND</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><B>WESTERN MINNESOTA MUNICIPAL POWER AGENCY,</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><FONT style="font-variant: SMALL-CAPS"><B>As Owners,</B></FONT>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><FONT style="font-variant: SMALL-CAPS"><B>and</B></FONT>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><B>OTTER TAIL CORPORATION dba OTTER TAIL POWER<BR>
COMPANY,</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><FONT style="font-variant: SMALL-CAPS"> <B>As Operator</B></FONT>
</DIV>


<DIV align="center" style="font-size: 14pt; margin-top: 6pt"><B>JUNE 30, 2005</B></DIV>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page </FONT>i</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June</FONT>&nbsp;30, 2005</TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>TABLE OF CONTENTS</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="76%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2"><U>Page</U></TD>
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD colspan="5" align="left"><B>OPERATION AND MAINTENANCE SERVICES AGREEMENT</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="5" align="left"><B>ARTICLE I RULES OF CONSTRUCTION AND INTERPRETATION; DEFINED TERMS</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">1.01</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Rules of Construction</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS"> 2</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">1.02</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Interpretation with the 2005 Joint Facilities Agreement</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS"> 2</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">1.03</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Interpretation with Participation Agreement</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS"> 3</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">1.04</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Defined Terms</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS"> 3</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="5" align="left"><B>ARTICLE II TERM &#038; TERMINATION</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">14</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">2.01</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Term</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">14</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">2.02</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Suspension or Termination</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">14</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">2.03</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Suspension and Termination Payments</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">15</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">2.04</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Surviving Provisions</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">16</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="5" align="left"><B>ARTICLE III OWNERS&#146; RIGHTS &#038; RESPONSIBILITIES</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">16</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">3.01</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Engineering and Operating Committee</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">16</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">3.02</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Documents</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">17</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">3.03</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Utilities</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">17</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">3.04</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Fuel and Fuel Transportation</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">17</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">3.05</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Trust Account</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">17</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">3.06</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Authorizations</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">17</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">3.07</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Fines &#038; Penalties</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">17</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">3.08</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Additional Agreements</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">17</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">3.09</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Notifications</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">18</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">3.10</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Audits</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">18</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">3.11</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">On-Site Owner Representative</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">19</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">3.12</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Operation by Owners</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">19</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">3.13</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Monthly Financial Statements</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">19</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="5" align="left"><B>ARTICLE IV OPERATOR RIGHTS &#038; RESPONSIBILITIES</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">20</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">4.01</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Scope of Services</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">20</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">4.02</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Operational Standards</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">22</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">4.03</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Personnel</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">22</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">4.04</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Plant Manager</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">23</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">4.05</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Training</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">23</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">4.06</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Procurement</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">23</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">4.07</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Records and Reports</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">25</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">4.08</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">BSP II Manuals</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">26</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">4.09</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Authorizations</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">26</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">4.10</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Notifications</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">26</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">4.11</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:30px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Emergency Actions</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">27</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page</FONT> ii</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June</FONT>&nbsp;30, 2005</TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="76%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">4.12</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Cooperation in Financing</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">28</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">4.13</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Cooperation Following Termination</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">28</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">4.14</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Liens or Encumbrances</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">29</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">4.15</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Authority Limitations</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">29</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="5" align="left"><B>ARTICLE V BUDGET AND OPERATING PLAN PROCEDURES</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><B>30</B></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">5.01</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Pre-Commercial Operation</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">30</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">5.02</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Operations Period</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">31</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="5" align="left"><B>ARTICLE VI CONSIDERATION</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><B>32</B></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">6.01</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Compensation</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">33</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="5" align="left"><B>ARTICLE VII INSURANCE</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><B>33</B></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">7.01</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Provided by Owners</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">33</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">7.02</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Provided by Operator</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">34</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">7.03</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Premiums &#038; Deductibles</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">34</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">7.04</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Replacement Insurance By Operator</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">35</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">7.05</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Replacement Insurance By Owner</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">35</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="5" align="left"><B>ARTICLE VIII INDEMNIFICATIONS</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><B>35</B></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">8.01</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Owners&#146; Indemnification</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">35</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">8.02</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Operator Indemnification</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">35</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">8.03</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Comparative Liability</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">35</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">8.04</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Notice and Participation</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">36</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">8.05</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Net Amount</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">37</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="5" align="left"><B>ARTICLE IX DEFAULTS &#038; REMEDIES</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><B>37</B></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">9.01</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Operator Events of Default</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">37</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">9.02</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Owners Events of Default</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">38</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">9.03</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Procedure and Remedies</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">38</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">9.04</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Operator Liability Limiting Events</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">38</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">9.05</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Remedies Cumulative</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">39</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="5" align="left"><B>ARTICLE X LIABILITY LIMITATIONS</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><B>39</B></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">10.01</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">No Consequential Damages</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">39</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">10.02</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">No Warranties or Guarantees</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">39</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">10.03</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Assertion of Claims</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">40</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="5" align="left"><B>ARTICLE XI DISPUTE RESOLUTION</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><B>40</B></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">11.01</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Resolution By Coordination Committee</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">40</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">11.02</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Continued Performance</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">40</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="5" align="left"><B>ARTICLE XII REPRESENTATIONS &#038; WARRANTIES</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><B>40</B></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">12.01</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Of Each Party</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">40</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="5" align="left"><B>ARTICLE XIII MISCELLANEOUS</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><B>41</B></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.01</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Access</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">41</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page </FONT>iii</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June&nbsp;30, 2005</FONT></TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="76%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.02</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Cooperation of the Parties</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">42</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.03</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Force Majeure Event</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">42</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.04</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Publicity Policy</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">42</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.05</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Notices</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">43</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.06</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Transfers &#038; Assignments</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">43</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.07</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Late Payments</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">44</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.08</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Third-Party Beneficiaries</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">45</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.09</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Title Passage</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">45</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.10</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Relationship of Parties</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">45</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.11</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Entire Agreement</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">45</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.12</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Amendments</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">45</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.13</FONT>
      <FONT style="font-variant: SMALL-CAPS"></font></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px">Governing Law</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">45</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.14</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Consent to Jurisdiction</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">45</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.15</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Waiver Of Trial By Jury</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">46</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.16</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Severability</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">46</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.17</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Waiver</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">46</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.18</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Counterparts</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">46</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right"><FONT style="font-variant: SMALL-CAPS">13.19</FONT></TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:45px; text-indent:-15px"><FONT style="font-variant: SMALL-CAPS">Captions</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><FONT style="font-variant: SMALL-CAPS">46</FONT></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="5" align="left"><B>EXHIBIT A</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><B>48</B></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="5" align="left"><B>SCHEDULE 1.04</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><B>50</B></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="5" align="left"><B>SCHEDULE 4.01</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><B>51</B></TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top" align="left">&nbsp;</TD>
    <TD valign="top" align="right">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="5" align="left"><B>SCHEDULE 5.02(b)(i)</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right"><B>62</B></TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page </FONT>1</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June&nbsp;30, 2005</FONT></TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="center" style="font-size: 12pt; margin-top: 18pt"><FONT style="font-variant: SMALL-CAPS"><B>Operation and Maintenance</B></FONT>
</DIV>


<DIV align="center" style="font-size: 12pt; margin-top: 18pt"><FONT style="font-variant: SMALL-CAPS"><B>Services Agreement</B></FONT>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>THIS OPERATION AND MAINTENANCE SERVICES AGREEMENT </B>(the &#147;Agreement&#148;) dated as of June&nbsp;30,
2005 (the &#147;Effective Date&#148;), by and among Central Minnesota Municipal Power Agency, an agency
incorporated under the laws of Minnesota (&#147;CMMPA&#148;), Great River Energy, a cooperative corporation
incorporated under the laws of Minnesota (&#147;GRE&#148;), Heartland Consumers Power District, a consumers
power district formed and organized under the South Dakota Consumers Power District Law (Chapter
49-35 of the South Dakota Codified Laws) (&#147;Heartland&#148;), Montana-Dakota Utilities Co., a Division of
MDU Resources Group, Inc., a corporation incorporated under the laws of the State of Delaware
(&#147;Montana-Dakota&#148;), Otter Tail Corporation, a corporation incorporated under the laws of Minnesota
(&#147;Otter Tail&#148;), Southern Minnesota Municipal Power Agency, a municipal corporation and political
subdivision of the State of Minnesota (&#147;SMMPA&#148;), and Western Minnesota Municipal Power Agency, a
municipal corporation and political subdivision of the State of Minnesota (&#147;WMMPA&#148;) (each an
&#147;Owner&#148; and collectively, the &#147;Owners&#148;) and Otter Tail, in its capacity as operator of BSP I and/or
BSP II (&#147;Operator&#148;). Each of the Owners and the Operator is referred to herein individually as a
&#147;Party,&#148; and collectively as the &#147;Parties.&#148;
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>RECITALS</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>WHEREAS</B>, Owners, for as long as they remain Owners, along with such other Persons that from
time to time may be Owners of BSP II, are the developers and owners of the new, approximately 600
MW coal-fired electric generating plant in Big Stone City, South Dakota known as BSP II (as such
term is defined below); and
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>WHEREAS</B>, Otter Tail owns fifty-three and nine-tenths percent (53.9%) of BSP I (as such term is
defined below) and currently operates BSP I for itself, Montana-Dakota, and NorthWestern
Corporation (formerly known as NorthWestern Public Service Company), a corporation incorporated
under the laws of the State of Delaware, doing business as NorthWestern Energy (&#147;NorthWestern&#148;);
and
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>WHEREAS, </B>on June&nbsp;30, 2005, CMMPA, GRE, Heartland, Montana-Dakota, NorthWestern, Otter Tail,
SMMPA, and WMMPA entered into the Joint Facilities Agreements (as such term is defined below); and
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>WHEREAS</B>, Owners believe that certain cost savings, efficiencies and economies can be realized
through the joint operation and maintenance of BSP I and BSP II, and through the utilization of the
experience and expertise which Operator has obtained from its operation and maintenance of BSP I;
and
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>WHEREAS</B>, Owners desire to retain Operator to provide the Services (as such term is defined
below) for BSP II, and Operator desires to perform the Services, upon the terms and conditions set
forth in this Agreement.
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page </FONT>2</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June&nbsp;30, 2005</FONT></TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>NOW, THEREFORE</B>, in consideration of the agreements and covenants set forth herein, and other
good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, and
intending to be legally bound by this Agreement, the Parties covenant and agree as follows:
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>ARTICLE I</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>RULES OF CONSTRUCTION AND INTERPRETATION; DEFINED TERMS</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>1.01 Rules of Construction. </B>The capitalized terms listed in this Article shall have the
meanings set forth herein whenever the terms appear in this Agreement, whether in the singular or
the plural or in the present or past tense. Other terms used in this Agreement but not listed in
this Article shall have meanings as commonly used in the English language and, where applicable, in
Prudent Utility Practice (as such term is defined below). Words not otherwise defined herein that
have well-known and generally accepted technical or trade meanings are used herein in accordance
with such recognized meanings. In addition, the following rules of interpretation shall apply:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The masculine shall include the feminine and neuter.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>References to &#147;Appendices,&#148; &#147;Articles,&#148; &#147;Sections,&#148; &#147;Schedules&#148; or &#147;Exhibits&#148;
shall be to appendices, articles, sections, schedules or exhibits of this Agreement.
Any references to &#147;Appendices,&#148; &#147;Sections,&#148; &#147;Schedules,&#148; or &#147;Exhibits&#148; shall be deemed
to mean, as applicable, as the same may be amended from time to time in accordance with
the provisions of this Agreement.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>This Agreement was negotiated and prepared by each of the Parties with the
advice and participation of counsel. The Parties have agreed to the wording of this
Agreement and none of the provisions hereof shall be construed against one Party on the
ground that such Party is the author of this Agreement or any part hereof.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The Parties shall act reasonably and in accordance with the principles of good
faith and fair dealing in the performance of this Agreement. Unless expressly provided
otherwise in this Agreement, (i)&nbsp;where the Agreement requires the consent, approval, or
similar action by a Party, such consent or approval shall not be unreasonably withheld,
conditioned or delayed, and (ii)&nbsp;wherever the Agreement gives a Party a right to
determine, require, specify or take similar action with respect to a matter, such
determination, requirement, specification or similar action shall be reasonable.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>1.02 Interpretation with the Joint Facilities Agreements. </B>The Parties, recognizing that they
have entered into the Joint Facilities Agreements with each other and NorthWestern:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>acknowledge that the terms of this Agreement are not binding upon NorthWestern;
and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>notwithstanding any other provision in this Agreement, nothing in the Joint
Facilities Agreements (as such term is defined below) shall alter or modify a Party&#146;s
rights, duties and obligations under this Agreement. This Agreement shall</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page </FONT>3</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June&nbsp;30, 2005</FONT></TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 8%">not be
construed to create any rights between the Parties and any Third Party, except to
the extent specifically provided herein.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>1.03 Interpretation with Participation Agreement. </B>The Parties recognize that they are
contemporaneously entering into that certain Participation Agreement dated as of June&nbsp;30, 2005 (the
&#147;Participation Agreement&#148;) which defines, governs and controls the relationship between the Owners
in connection with their ownership of BSP II.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>1.04 Defined Terms.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In addition to definitions of other terms appearing elsewhere in this Agreement, the following
terms, when used herein, have the meanings specified:
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Additional Agreement: </I>Shall mean:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any contract, instrument or agreement; or</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any amendment, modification or supplement to, or restatement of, a Project
Document; in either case that (i)&nbsp;is entered into after the Effective Date, and (ii)
may materially affect Operator&#146;s obligations or liabilities under this Agreement, the
performance of the Services, BSP II or the Joint Facilities.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Affiliate(s): </I>Shall mean with respect to any Person:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any Person that directly or indirectly, controls or is controlled by or is
under common control with such Person; or</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any Person that beneficially owns or holds fifty percent (50%) or more of any
class of voting securities of such Person or owns or holds fifty percent (50%) or more
of an ownership interest (on a fully diluted basis) in such Person.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">For the purposes of this definition, &#147;control,&#148; &#147;controlled by,&#148; and &#147;under common control with,&#148;
mean the possession, directly or indirectly, of the power to direct or cause the direction of the
management or policies of a Person, whether through the ownership of voting securities or by
contract or otherwise. Notwithstanding the foregoing provisions, Operator and Owners (except with
regard to Otter Tail) shall not be deemed to be Affiliates of each other and any Person that is
otherwise an Affiliate of Operator shall not be deemed to be an Affiliate of Operator for purposes
of this Agreement to the extent such Person is acting in its capacity as an Owner or as a
Representative of an Owner.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Agreement: </I>Shall mean this Agreement, as amended from time to time.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Applicable Law: </I>Shall mean:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any and all Laws enacted, issued or promulgated by a Governmental Authority;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any and all orders, judgments, writs, decrees, injunctions, Governmental
Approvals or other decisions of a Governmental Authority; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any and all legally binding announcements, directives or published practices or
interpretations, regarding any of the foregoing in (a)&nbsp;or (b)&nbsp;of this definition,
enacted, issued or promulgated by a Governmental Authority;
</TD>
</TR>
</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">


</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page </FONT>4</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June&nbsp;30, 2005</FONT></TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">to the extent, for each of the foregoing in (a), (b)&nbsp;and (c)&nbsp;of this definition, applicable to or
binding upon (i)&nbsp;BSP II; (ii)&nbsp;a Party, its Affiliates, its members, it partners or their respective
Representatives, to the extent any such Person is engaged in activities related to BSP II; or (iii)
the property of a Party, its Affiliates, its members, its partners or their respective
Representatives, to the extent such property is used in connection with BSP II or an activity
related to BSP II.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Authorization: </I>Shall mean any corporate, governmental or other license, permit, approval,
entitlement, allowance, franchise, or other authorization, including Governmental Approvals,
applicable to or binding upon:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>BSP II;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>a Party, its Affiliates, its partners or their respective Representatives, to
the extent any such Person is engaged in activities related to BSP II; or</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the property of a Party, its Affiliates, its partners or their respective
Representatives, to the extent such property is used in connection with BSP II or an
activity related to BSP II.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Bankruptcy: </I>Shall mean with respect to a Person, any situation in which:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>such Person (i)&nbsp;applies for or consents to the appointment of, or the taking of
possession by, a trustee, receiver, custodian, liquidator or the like of itself or of
all or a substantial part of its property; (ii)&nbsp;admits in writing its inability, or
becomes generally unable, to pay its debts as such debts become due; (iii)&nbsp;makes a
general assignment for the benefit of its creditors or takes any other similar action
for the protection or benefit of its creditors; (iv)&nbsp;commences a voluntary case under
the Federal Bankruptcy Code; (v)&nbsp;files a petition seeking to take advantage of any
other law relating to bankruptcy, insolvency, reorganization, winding-up, composition
or adjustment of debts or other relief for debtors; or (vi)&nbsp;takes any action for the
purpose of effecting any of the foregoing; or</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>a proceeding or case is commenced without the application or consent of such
Person in any court of competent jurisdiction, seeking (i)&nbsp;such Person&#146;s liquidation,
reorganization, dissolution, winding-up, composition or readjustment of its debts or
other relief for its debtors; (ii)&nbsp;the appointment of a trustee, receiver, custodian,
liquidator or the like of such Person or of all or a substantial part of its property
under any law relating to bankruptcy, insolvency, reorganization, winding-up,
composition or adjustment of its debts or other relief for its debtors; or (iii)&nbsp;a
warrant of attachment, execution or similar process against all or a substantial part
of the assets of such Person; and such proceeding or case shall continue undismissed,
or any order, judgment or decree approving or ordering any of the foregoing in (b) (i),
(ii)&nbsp;or (iii)&nbsp;of this definition shall be entered and continue unstayed and in effect,
for a period of ninety (90)&nbsp;or more days, or any order for
relief against such Person shall be entered in an involuntary case under the Federal
Bankruptcy Code.</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page </FONT>5</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June&nbsp;30, 2005</FONT></TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Benefits: </I>Shall mean:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>time for which Operator&#146;s employees are paid but during which they are not
actually working including, but not limited to, vacations, company holidays, floating
holidays, sick leave, jury duty, funeral leave, parental leave, military leave, paid
time off, weather-related limitations on work, rest periods, standby pay, and any
excused absences;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>accrued vacations (for which the employees have not yet been paid); provided,
however, that such amounts shall not be double-counted;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>expenses of, and related to, other reasonable and customary Benefits,
including, but not limited to, employee stock ownership plans, employee stock purchase
programs, employee charitable donation matching programs, education expense
reimbursement programs, employee assistance programs, adoption assistance, and employee
interest free financing programs;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>pension plan expenses, post-retirement medical expenses and long-term
disability medical expenses, actuarially calculated per the guidelines of FASB 87, FASB
106 and FASB 112, respectively, the cost of the employer&#146;s match of employees&#146; 401(k)
contributions (per Operator&#146;s company policy), and any other retirement and
post-retirement benefits, costs and expenses;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(e)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the employer&#146;s share of medical, vision, dental, accidental death and
dismemberment insurance, disability and life insurance benefits for Operator&#146;s
employees and their dependents;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(f)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the employer&#146;s share of Social Security and Medicare tax and government
mandated disability insurance, unemployment insurance, and workers&#146; compensation
insurance and benefits; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(g)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>without duplication, any benefits provided pursuant to collective bargaining
agreements.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Blanket Easement Agreement: </I>Shall mean that certain easement agreement dated June&nbsp;30, 2005 by
and among the Parties and NorthWestern.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>BSP I: </I>Shall mean the existing 450 MW coal-fired electric generating plant located in Grant
County, South Dakota, and owned by Otter Tail, NorthWestern and Montana-Dakota.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>BSP Workforce: </I>Shall mean those employees of Operator who perform work on behalf of BSP II at
BSP II.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>BSP II or Plant: </I>Shall mean the new, approximately 600 MW coal-fired electric generating
plant to be located adjacent to BSP I, and owned jointly by the Owners.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>BSP II Manuals: </I>Shall mean, with respect to BSP II:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the administrative policies and procedures manual(s);</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the operations and maintenance manual(s);</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page </FONT>6</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June&nbsp;30, 2005</FONT></TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the safety manual(s);</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the environmental compliance manual(s);</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(e)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the training manual(s);</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(f)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the emergency response plan; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(g)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any other manuals or plans (except for accounting and operating records, logs
and reports) associated with operation and maintenance of BSP II or performance of the
Services that are, in either case, required by this Agreement, Applicable Law or that
are routinely prepared by Operator;</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">in each case as the same may be amended, supplemented or replaced from time to time.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Business Day: </I>Shall mean any day other than Saturday, Sunday or a weekday that is a legal
holiday in the State of South Dakota.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Capacity: </I>Shall mean an electrical rating expressed in megawatts (MW).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>CMMPA: </I>Shall have the meaning given to such term in the preamble to this Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Commencement Date: </I>Shall mean the date, as set forth in a Notice prepared by Owners and
delivered to Operator in accordance with Section&nbsp;2.01, on which Operator assumes the full care,
custody and control of the operation and maintenance of BSP II.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Commercial Operation: </I>Shall mean that the Plant is operating and producing Capacity and
Energy on a continuous basis, and is delivering such Energy to the Owners in accordance with
Prudent Utility Practice and Applicable Law.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Construction Contracts: </I>Shall mean the contracts and agreements for the construction of BSP
II, including any transmission or other interconnection facilities, that are duly authorized and
executed.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Default Budget: </I>Shall mean, in the absence of an approved Operating Plan &#038; Budget for
performing the Services due to a disagreement between the Parties, the cost budget prepared by
Operator in accordance with Section&nbsp;5.02(c).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Demobilization Costs: </I>Shall mean the costs and expenses reasonably incurred and paid or
payable by Operator as a result of a suspension of the Services or a termination of this Agreement
as contemplated in Section&nbsp;2.03(b), including, without limitation, any cancellation or termination
charges incurred by Operator in accordance with any BSP II or Services related agreement to which
Operator is a party and that is not assigned to Owners.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Demobilization Invoice: </I>Shall mean the invoice for Demobilization Costs prepared by Operator
and submitted to Owners in accordance with Section&nbsp;2.03(b).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Dispute: </I>Shall mean any controversy, dispute or claim between the Parties in connection with,
relating to, or arising out of this Agreement (including any question regarding a controversy&#146;s,
dispute&#146;s or claim&#146;s existence, validity, interpretation, or termination or the performance or
non-performance of a Party) that cannot be resolved informally by the Plant
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page </FONT>7</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June&nbsp;30, 2005</FONT></TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">Manager and the
Engineering and Operating Committee within seven (7)&nbsp;days of such controversy, dispute or claim
being brought to the attention of one Party by another Party.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Effective Date: </I>Shall have the meaning given to that term in the preamble to this Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Emergency: </I>Shall mean any condition or circumstance related to BSP I, BSP II or the Joint
Facilities that, in the reasonable opinion of Operator, requires prompt action in order to avoid or
mitigate personal injury, substantial property damage, violation of an Applicable Law or any other
material adverse impact on BSP II, the Parties, any other Person, or the performance of the
Services.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Energy: </I>Shall mean energy having characteristics commonly known as three phase alternating
current, with a nominal frequency of sixty (60)&nbsp;Hertz, a nominal voltage equivalent to that of
Otter Tail&#146;s or its successor&#146;s transmission system, and measured in kilowatt-hours (kWh) or
megawatt-hours (MWh).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Engineering and Operating Committee or E&#038;O Committee: </I>Shall have the meaning given to such
terms in Section&nbsp;3.01.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Escalation Factor: </I>Shall mean the Gross Domestic Product Implicit Price Deflator as published
routinely by the Bureau of Economic Analysis, U. S. Department of Commerce, its successor or such
other reasonably appropriate indicator of inflation agreed to in writing by the Parties.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>FASB: </I>Shall mean the Financial Accounting Standards Board or any successor thereof.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Final Expenses &#038; Fees Invoice: </I>Shall mean the invoice prepared by Operator and submitted to
Owners in the event of termination of this Agreement in accordance with Section&nbsp;2.03(a).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Force Majeure Event: </I>A cause or event beyond the reasonable control of, and without the fault
or negligence of the Party, including, without limitation, an Emergency, act of God; flood,
earthquake, hurricane, or tornado and the like; sabotage; vandalism beyond that which could
reasonably be prevented by a Party; terrorism; war; riot; fire; explosion; blockade; insurrection;
strike, slow down or labor disruption (even if such could be resolved by conceding to the demands
of a labor group); and action or failure to take actions by any Governmental Authority after the
Effective Date (including, without limitation, the adoption or change in any Law, but only if such
action or failure to take action prevents or delays performance) and the inability, despite due
diligence, to obtain any license, permit, or approval required by any Governmental Authority;
provided, however that an Owner&#146;s action or failure to take any action if such Owner is a
Governmental Authority shall not be deemed a Force Majeure Event; provided, however, that the
occurrence of a Force Majeure Event shall not excuse or relieve a Party from any payment
obligations hereunder.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Fully Loaded Wages: </I>Shall mean the sum of the following: Wages &#043; (Wages x Labor Loading).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Governmental Approvals: </I>Shall mean any and all Authorizations issued or granted by any
Governmental Authority to BSP II or to any Party, its Affiliates, its partners, its members or
their
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page </FONT>8</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June&nbsp;30, 2005</FONT></TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">respective Representatives in connection with such Person&#146;s participation in any activity
related to BSP II.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Governmental Authority(ies): </I>Shall mean any federal, state, local or municipal governmental
body; any governmental, quasi-governmental, regulatory or administrative agency, commission, body
or other authority exercising or entitled to exercise any administrative, executive, judicial,
legislative, policy, regulatory or taxing authority or power; any court or governmental tribunal;
any independent system operator, regional transmission organization, reliability organization, or
other regulatory body; in each case having jurisdiction over any Owner, the Operator, the Project,
Site, or the transmission system to which either Plant is interconnected.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>GRE: </I>Shall have the meaning given to such term in the preamble to this Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Heartland: </I>Shall have the meaning given to such term in the preamble to this Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Indemnified Party: </I>Shall mean any Person entitled to be indemnified pursuant to this
Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Indemnifying Party: </I>Shall mean the Party required to indemnify the Indemnified Party pursuant
to this Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Joint Facilities: </I>Shall mean those facilities identified as such in the Joint Facilities
Agreements.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Joint Facilities Agreements: </I>Shall mean that certain Big Stone I and Big Stone II 2005 Joint
Facilities Agreement dated as of June&nbsp;30, 2005, by and among CMMPA, GRE, Heartland, Montana-Dakota,
NorthWestern, Otter Tail, SMMPA, and WMMPA, a copy of which is attached hereto as <B>Schedule&nbsp;1.04</B>.,
the Option to Purchase Contract, and the Blanket Easement Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Key Performance Indicators or KPIs: </I>Shall mean those performance indicators that the E&#038;O
Committee may use to measure the operating performance under this Agreement, including, without
limitation, those KPIs listed on <B>Schedule&nbsp;5.</B><B>02(b)(i)</B> hereto.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Labor Expenses: </I>Shall mean:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the Fully Loaded Wages of the BSP Workforce;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the Fully Loaded Wages of Operator&#146;s employees who are not members of the BSP
Workforce who provide services for the benefit of and directly attributable to BSP II,
plus a (*) thereon; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>all directly attributable, legitimate and verifiable costs of administering the
compensation and Benefit programs and any such other costs and expenses relating to the
employment or employment termination of the BSP Workforce, but
excluding any bonuses paid to the BSP Workforce (unless required by a collective
bargaining agreement).</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Labor Loading: </I>Shall mean a percentage equal to the ratio of the total cost of Benefits to
the total Wages paid for all employees working in Operator&#146;s electric utility operations.
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page</FONT> 9</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June&nbsp;30, 2005</FONT></TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Laws: </I>Shall mean any and all federal, state, and local statutes, laws, judicial decisions,
regulations, ordinances, rules, judgments, orders, decrees, codes, plans, injunctions, permits,
governmental agreements and governmental restrictions of any Governmental Authority, whether now or
hereafter in effect.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Lender: </I>Shall mean a Person providing financing or refinancing to any Owner in connection
with the development, construction, alteration, rehabilitation, or working capital needs of BSP II.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Lenders&#146; Consent: </I>Shall have the meaning given to such term in Section&nbsp;4.12.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Liability Limiting Event: </I>Shall have the meaning given to such term in Section&nbsp;9.04.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Losses</I>: Shall mean, with respect to a Party, its Affiliates, its partners or their respective
Representatives, any and all costs, expenses, liabilities, damages, injuries or other financial
losses of any kind or nature, including fines, penalties, claims, awards, judgments, demands,
insurance deductibles, court costs and reasonable attorneys&#146; fees, incurred by such Person.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Manufacturers&#146; Recommendations: </I>Shall mean the written instructions, procedures and
recommendations relating to the operation, maintenance and repair of equipment used at BSP II which
are issued by the manufacturer of such equipment, and any revisions thereto, issued by the
manufacturer, which:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>have been delivered to Operator;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>are consistent with the requirements, if any, of the insurance underwriters for
BSP II; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>have not been superseded by written agreement of Owners and Operator.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>MAPP: </I>Shall mean the Mid-Continent Area Power Pool or any successor thereof.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Montana-Dakota: </I>Shall have the meaning given to such term in the preamble to this Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Non-Recurring Operating Expenses: </I>Shall mean Operating Expenses that do not occur or are not
expected to occur consistently at least once every year.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Notice: </I>Shall mean a written communication regarding:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the occurrence of an event related to BSP II or the Joint Facilities;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the intent to take or omit to take any action related to BSP II or the Joint
Facilities;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>a consent, approval or the request therefor;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>other similar type of communication related to BSP II or the Joint Facilities;
or</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(e)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any other communication required to be given under this Agreement;</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">delivered, in each of the foregoing in (a), (b), (c), (d), and (e)&nbsp;of this definition, by one Party
to the other Party or to a Lender in accordance with Sections&nbsp;3.09 and 13.05 of this Agreement.
</DIV>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page </FONT>10</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June&nbsp;30, 2005</FONT></TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Notification Matrix: </I>Shall mean the specific procedures for notifications by Operator as
required by Applicable Law and Section&nbsp;4.10.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>On-Site Representative: </I>Shall mean the individual designated by an Owner or Owners in
accordance with Section&nbsp;3.11.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Operating Expenses: </I>Shall mean, without duplication, all properly authorized and directly
attributable BSP II costs and expenses incurred in connection with Operator&#146;s provision of Services
in accordance with this Agreement, including, without limitation:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Labor Expenses, to the extent they are the result of direct, legitimate and
verifiable services provided for the benefit of BSP II;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>costs and expenses incurred in connection with the procurement and delivery of
goods and services from Third-Party Suppliers and the administration of procurement
contracts;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>costs and expenses incurred in connection with reactive, preventive and
predictive maintenance and repairs;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>costs incurred in connection with capital improvements, additions, replacements
and alterations; however, all such costs shall be separately accounted for and reported
to Owner as capital improvements prepared pursuant to the Federal Energy Regulatory
Commission&#146;s Uniform System of Accounts;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(e)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>costs and expenses incurred in connection with Emergencies, Force Majeure
Events and Changes in Law;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(f)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>costs and expenses incurred in connection with the use or consumption of water
supply and telephone and other utility-related services;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(g)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>costs and expenses incurred in connection with ash and waste handling and
disposal;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(h)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>costs and expenses incurred in connection with training the BSP Workforce;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>costs and expenses incurred in connection with obtaining, maintaining and
administering insurance protection, including, but not limited to, policy premiums,
deductibles, self-insured retentions, broker fees and claims administration costs.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(j)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>costs and expenses incurred in connection with legal, accounting, engineering
and other professional services;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(k)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>costs and expenses incurred in connection with Site security;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(l)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>costs and expenses incurred in connection with obtaining, maintaining,
renewing, extending and complying with Laws, Governmental Approvals and other
Authorizations;</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page </FONT>11</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June&nbsp;30, 2005</FONT></TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(m)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>costs and expenses incurred pursuant to and within the limitations of the
Pre-Commercial Operation Operating Plan &#038; Budget or the applicable Operating Plan &#038;
Budget, as the case may be;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(n)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Permitted Overruns;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(o)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>fines paid by Operator relating to BSP II or the operations thereof that are
not caused by the Willful Action of the Operator;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(p)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the Operator Incentive;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(q)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the obligations of the BSP II Owners pursuant to the Joint Facilities
Agreements;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(r)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>taxes or assessments by Governmental Authorities, including sales and gross
receipts taxes, duties and levies, except for Operator&#146;s income taxes and any taxes or
assessments that are levied directly against any Owner; or</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(s)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>costs and expenses otherwise authorized by this Agreement or approved by the
Owners.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">To the extent that any cost or expense described above benefits BSP I and/or the Joint Facilities
as well as BSP II, for the purposes of this Agreement such costs shall be Operating Expenses to the
extent they are allocated to BSP II by the Joint Facilities Agreements or are otherwise
legitimately allocable to BSP II.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Operating Plan &#038; Budget: </I>Shall mean the operating plan and cost budget for performing the
Services during the year specified in such plan and budget, approved by Owners in accordance with
Section&nbsp;5.02(b).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Operator: </I>Shall have the meaning given to such term in the preamble to this Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Operator Event of Default: </I>Shall have the meaning given to such term in Section&nbsp;9.01.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Operator Incentive: </I>Shall mean (*), as adjusted annually using the Escalation Factor.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Operator Indemnitee: </I>Shall mean each of Operator and its respective Representatives, who is
entitled to indemnification by Owners in accordance with Section&nbsp;8.01.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Option to Purchase Contract: </I>Shall mean that certain option to purchase contract dated June
30, 2005 by and among the BSP I Owners and Otter Tail, as administrative agent on behalf of itself
and the other BSP II Owners.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Otter Tail: </I>Shall have the meaning given to such term in the preamble to this Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Overdue Payment Rate: </I>Shall mean the interest rate published in The Wall Street Journal,
Eastern edition, as the &#147;prime rate&#148; as of the date a payment required by this Agreement to which
the Overdue Payment Rate is applied is first due and payable, plus an additional four percent (4%)
per annum.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Owner Indemnitee: </I>Shall mean each of Owners, its partners and Affiliates, and their
respective Representatives, who is entitled to indemnification by Operator in accordance with
Section&nbsp;8.02.
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page </FONT>12</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June&nbsp;30, 2005</FONT></TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Owner(s): </I>Shall mean those Persons designated as Owners under the Participation Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Owners Event of Default: </I>Shall have the meaning given to such term in Section&nbsp;9.02.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Participation Agreement: </I>Shall have the meaning given to such term in Section&nbsp;1.03.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Party or Parties: </I>Shall have the meaning given to such term in the preamble to this
Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Permitted Overrun(s): </I>Shall mean any Operating Expense incurred in accordance with Prudent
Utility Practices that is in excess of the budget for any given line item for such Operating
Expenses as set forth in the Pre-Commercial Operation Operating Plan &#038; Budget.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Person: </I>Shall mean an individual, a partnership, a corporation, a limited liability company,
an association, a joint-stock company, a business trust, consumers powers district, cooperative,
unincorporated association, government or any subdivision thereof, or an organized group of
individuals (whether incorporated or not), or a receiver, trustee or other liquidating agent of any
of the foregoing in his capacity as such.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Plant Manager: </I>Shall mean that individual designated by Operator, in accordance with Section
4.04, to act as the representative of Operator in matters relating to this Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Pre-Commercial Operation Operating Plan &#038; Budget: </I>Shall mean the operating plan and cost
budget for performing the Services during the Pre-Commercial Operation Period approved by the
Parties in accordance with Section&nbsp;5.01(b).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Pre-Commercial Operation Period: </I>Shall mean the period beginning with the date of approval of
the Proposed Pre-Commercial Operation Operating Plan &#038; Budget and ending with and including the day
prior to the date of Commercial Operation.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Project: </I>Shall mean the undertaking of the Owners with respect to the development and
construction of BSP II as set forth in Section&nbsp;2.01 of the Participation Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Project Documents: </I>Shall mean any and all documents, agreements and Governmental
Authorizations, as such may be amended from time to time, in accordance with their respective
terms, related to the Plant and the Project.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Proposed Operating Plan &#038; Budget: </I>Shall mean the proposed plan of operations and cost budget
for a specified year prepared by Operator and submitted to Owners in accordance with Section
5.02(a).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Proposed Pre-Commercial Operation Operating Plan &#038; Budget: </I>Shall mean the proposed cost
budget and plan for performing Services during the Pre-Commercial Operation Period prepared by
Operator and submitted to Owners in accordance with Section&nbsp;5.01(a).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Prudent Utility Practice: </I>Shall mean any of the practices, methods or acts required by
Applicable Law, the National Electric Safety Code, the Midwest Independent Transmission System
Operator, Inc., any other applicable regional transmission organization, the North American
Electric Reliability Council, or the successors of any of them, whether or not a Party is a member
thereof, or otherwise engaged in or approved by a significant portion of the utility
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page </FONT>13</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June&nbsp;30, 2005</FONT></TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">electric
generation industry during the relevant time period or any of the practices, methods and acts that
in the exercise of reasonable judgment in light of the facts known at the time the decision was
made, could have been expected to accomplish the desired result at a reasonable cost consistent
with good business practices, reliability, safety and expedition. Prudent Utility Practice is not
intended to be limited to the optimum practice, method or act to the exclusion of all others, but
rather to be acceptable practices, methods or acts generally accepted in the Upper Midwest region.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Reasonable Efforts: </I>Shall mean a level of effort which, in the exercise of reasonable
judgment in the light of facts or circumstances known, or which should reasonably be known, at the
time a decision is made, can be expected by a reasonable Person to accomplish the desired result in
a manner consistent with Prudent Utility Practice.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Representative: </I>Shall mean, with respect to a Party, any principal, shareholder, director,
officer, employee or agent of such Party or its Affiliates, but only to the extent, in each case,
such individual is engaged in the fulfillment of an obligation under this Agreement and is
fulfilling such obligation in his or her capacity as a principal, shareholder, member, director,
officer, employee or agent of such Party or its Affiliate.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Services: </I>Shall mean the obligations of Operator as set forth in this Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Site: </I>Shall mean the real property on which BSP II and the Joint Facilities are located,
together with any easements, leases, licenses, option rights, rights-of-way, and other rights used
in connection with BSP II.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>SMMPA: </I>Shall have the meaning given to such term in the preamble to this Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Successor Operator: </I>Shall mean the Person engaged by the Owners to operate BSP II upon the
termination of this Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Term: </I>Shall have the meaning given to such term in Section&nbsp;2.01 of this Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Third Party(ies): </I>Shall mean any Person other than a Party or an Affiliate of a Party.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Third-Party Supplier: </I>Shall mean any Person other than Operator and its Affiliates engaged by
Operator to perform any portion of the Services, including supplying goods, in accordance with this
Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Third-Party Losses: </I>Shall mean, with respect to a Person other than a Party and their
respective Affiliates, any and all claims by such Person for any and all costs, expenses,
liabilities, damages, injuries or other financial losses of any kind or nature, including fines,
penalties, claims, awards, judgments, demands, insurance deductibles, court costs and attorneys&#146;
fees.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Trust Account: </I>Shall mean the segregated trust account already established by Operator, in
accordance with Section&nbsp;3.05, for the payment of Operating Expenses.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Trust Account Deposit: </I>Shall have the meaning given to such term in Section&nbsp;3.05.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Wages: </I>Shall mean all wages and salaries for all time worked by Operator&#146;s employees, as
contemplated by this Agreement, including, but not limited to, overtime and other wage premiums.
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page </FONT>14</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June&nbsp;30, 2005</FONT></TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Willful Action: </I>Shall mean any act or omission of a Party (including an Owner acting as
Operator), done or not done, at the direction of its directors, a corporate officer or Plant
Manager in respect of the matter involved, which:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>is knowingly or intentionally done or not done with conscious indifference to
the consequences, or with the expectation that injury or damage to other Owners or any
other Person would, or would be reasonably likely to, result therefrom, which results
in a material breach of any provision of this Agreement; or</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>is determined by final judgment or decree of a court having jurisdiction, to be
a material default under this Agreement, and occurs or continues beyond the time
specified in such judgment or decree for curing such default, or if no time to cure is
specified therein, occurs or continues beyond a reasonable time to cure such default.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>WMMPA: </I>Shall have the meaning given to such term in the preamble to this Agreement.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>ARTICLE II</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>TERM &#038; TERMINATION</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>2.01 Term. </B>The term of this Agreement shall begin on the Effective Date and shall continue
for twenty (20)&nbsp;years after the first day of Commercial Operation unless terminated earlier in
accordance with the terms hereof (the &#147;Term&#148;). Owners shall deliver to Operator a Notice not later
than sixty (60)&nbsp;days prior to the Commencement Date.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>2.02 Suspension or Termination.</B>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>By Owners.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Owners may terminate this Agreement in accordance with Section
9.03 following an Operator Event of Default.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Owners may terminate this Agreement in the event a Force
Majeure Event that prevents operation of the Plant for a period of twelve (12)
months or more; provided that Owners deliver a Notice of termination to
Operator at least sixty (60)&nbsp;days prior to the effective date of such
termination.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Owners may terminate this Agreement for (*); provided that
Owners deliver a Notice of termination to Operator at least one hundred eighty
(180)&nbsp;days prior to the effective date of such termination; and provided
further, that Owners may not terminate this Agreement (*).</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iv)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>If the Plant becomes incapable of operation at any time after it commences
Commercial Operation, and the Plant cannot reasonably be expected to recommence
operations for a period of twelve (12)&nbsp;months or longer, then Owners may
require that Operator suspend performance of all or any portion of the Services
for such period, by delivering a Notice to Operator of such suspension. In
such event, Operator shall be relieved of any obligation to perform the
suspended Services during the period of</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page </FONT>15</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June&nbsp;30, 2005</FONT></TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 10%">suspension; provided that if such
suspension follows an Operator Event of Default, such suspension shall not
relieve Operator of any liability to Owners resulting from such Operator Event
of Default.
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>By Operator.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Operator may terminate this Agreement in accordance with
Section&nbsp;9.03 following an Owners Event of Default.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Operator may suspend performance of the Services following an
Owners Event of Default. Such suspension shall not relieve Owners of any
liability to Operator resulting from such Owners Event of Default. The
suspension shall end after the default is cured.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Operator may terminate this Agreement (*).</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>2.03 Suspension and Termination Payments.</B>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Expenses and Fees.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>If this Agreement is terminated for any reason before the first
date of Commercial Operation, then, no later than sixty (60)&nbsp;days following
such termination, Owners shall, without duplication of any amounts otherwise
paid in accordance with this Agreement: (A)&nbsp;pay to Operator a sum equal to four
(4)&nbsp;months of Fully Loaded Wages of Operator&#146;s employees who provide services
exclusively for the benefit of BSP II, and (B)&nbsp;pay to any other Owner a sum
equal to four (4)&nbsp;months of wages and benefits of any of such Owner&#146;s employees
who have been authorized to work exclusively for the benefit of BSP II.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Not later than sixty (60)&nbsp;days following termination of this
Agreement for whatever reason, Operator shall submit to Owners the Final
Expenses &#038; Fees Invoice which shall describe, in detail and with supporting
documentation reasonably acceptable to Owners and without duplication of any
amounts in any other invoice prepared in accordance with this Agreement, the
following:</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="10%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(1)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any and all Operating Expenses that: (A)&nbsp;were
incurred by Operator in accordance with this Agreement, (B)&nbsp;were paid
or are payable by Operator using other than Owners&#146; funds (including
such funds that
have been deposited in the Trust Account) and
(C)&nbsp;were not previously reimbursed by Owners;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="10%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(2)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any Operator Incentive due to Operator and
accrued prior to termination of this Agreement which has not previously
been paid by Owners;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="10%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(3)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any and all reasonable costs and expenses
incurred by Operator in connection with the performance of its
termination cooperation obligations as set forth in Section&nbsp;4.13;

</TD>
</TR>
</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">


</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%"></TD>
    <TD width="5%"></TD>
    <TD width="47%"></TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Operation and Maintenance Services Agreement</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page </FONT>16</TD>
</TR>
<TR valign="bottom">
    <TD align="left" valign="top"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power plant</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June&nbsp;30, 2005</FONT></TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="3" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="10%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(4)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any and all amounts due from Operator to Owners
pursuant to this Agreement, which amounts shall be offset against
amounts due Operator; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="10%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(5)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any damages determined by Operator to be due to
Operator by reason of an Owners Event of Default or, if such amount
cannot then be determined, such amounts as Operator estimates are
likely to be due to Operator as damages by reason of such Owners Event
of Default.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Not later than thirty (30)&nbsp;days after receiving the Final
Expenses &#038; Fees Invoice, Owners shall pay to Operator in immediately available
funds the total amount due, as such amount is set forth in the Final Expenses &#038;
Fees Invoice; provided, however, that any disputed amounts shall be deposited
into the Trust Account, pending resolution of any such Dispute. Any Dispute
regarding the Final Expenses &#038; Fees Invoice shall be resolved pursuant to
Article&nbsp;XI of this Agreement.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Demobilization. Not later than one hundred eighty (180)&nbsp;days after (i)
suspension of the Services by Owners; or (ii)&nbsp;termination of this Agreement for any
reason other than in accordance with Section&nbsp;9.01 for an Operator Event of Default;
Operator shall submit to Owners the Demobilization Invoice which shall describe the
Demobilization Costs in detail and with supporting documentation reasonably acceptable
to Owners. Not later than thirty (30)&nbsp;days after receiving the Demobilization Invoice,
Owners shall either dispute the Demobilization Invoice or pay to Operator in
immediately available funds the total amount of the Demobilization Costs, as such
amount is set forth in the Demobilization Invoice. Any Dispute regarding the
Demobilization Invoice shall be resolved pursuant to Article&nbsp;XI. Operator agrees to
cooperate with and support Owners after termination of this Agreement per the
requirements of Section&nbsp;4.13 of this Agreement.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>2.04 Surviving Provisions. </B>The termination of this Agreement shall not affect any rights or
obligations which have arisen or accrued before such termination. In addition, the provisions of
(a)&nbsp;Articles VIII, IX, X, XI, and XII and Sections&nbsp;2.03, 3.11, 13.10, 13.11, and 13.13, shall each
survive such termination
indefinitely; and (b)&nbsp;Sections&nbsp;3.10 and 13.04, shall each survive for a period of five (5)
years following the date of such termination.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>ARTICLE III</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>OWNERS&#146; RIGHTS &#038; RESPONSIBILITIES</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>3.01 Engineering and Operating Committee. </B>The Engineering and Operating Committee established
pursuant to the Participation Agreement (the &#147;Engineering and Operating Committee&#148; or &#147;E&#038;O
Committee&#148;) shall be authorized to act for and on behalf of Owners in all matters concerning this
Agreement. Owners shall be bound by the communications, directions, requests and decisions made by
the Engineering and Operating Committee. Owners shall deliver
</DIV>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">

<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation
And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 17</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant
</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt">to Operator a Notice of the identity
of the members of the Engineering and Operating Committee and the alternates thereto along with
general contact information.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>3.02 Documents. </B>Owners shall supply to Operator true and accurate copies of (a)&nbsp;the Project
Documents and (b)&nbsp;any other documents, materials, records, accounts reports and other information
related to BSP II in the possession of, or reasonably available to, Owners that (i)&nbsp;arose from, is
related to or is the result of the process of obtaining and maintaining Authorizations and that is
useful for identifying, interpreting and establishing the manner of compliance with Applicable Law
with respect to the performance of the Services or (ii)&nbsp;in Owner&#146;s reasonable discretion is
otherwise necessary or desirable for the performance of the Services in accordance with this
Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>3.03 Utilities. </B>Operator shall procure, or cause to be procured, as an Operating Expense, all
potable water, wastewater discharge service and telephone and data services required to perform the
Services in accordance with this Agreement. Such utility services will be procured as per policies
established by the Engineering and Operating Committee.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>3.04 Fuel and Fuel Transportation. </B>Operator shall assist the E&#038;O Committee with respect to
the procurement of fuel transportation and all types of fuel used in the operation of BSP II,
including coal and fuel oil. Fuel and fuel transportation will be procured at the direction of the
E&#038;O Committee, and in accordance with fuel procurement policies established by the Engineering and
Operating Committee from time to time. It is contemplated that the E&#038;O Committee may establish a
subcommittee for this purpose. All fuel, whether obtained for prompt consumption or for reserves,
shall be the property of the Owners. The cost of fuel purchased, including the cost of
transportation, shall be an Operating Expense.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>3.05 Trust Account. </B>Operator, on behalf of the Owners, has caused the Trust Account to be
established in the name of Owners with a financial institution agreed to by Owners. The Plant
Manager and certain other individuals designated by Operator with the prior concurrence of the
Engineering and Operating Committee shall be authorized to direct the trustee of the Trust Account
to make withdrawals from the Trust Account for the sole purpose of making Operating Expense
payments. Any interest earned on funds in the Trust Account shall be deposited into the Trust Account and shall accrue to the
benefit of Owners. Owners shall make payments into the Trust Account (each such deposit, a &#147;Trust
Account Deposit&#148;), as provided for in the Participation Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>3.06 Authorizations. </B>Owners shall obtain, renew or extend, as required, all Authorizations
required for the performance of the Services except for those Authorizations which must be obtained
by or in the name of Operator. Operator shall comply with all of the requirements of such
Authorizations except for those requirements that can only be complied with by Owners.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>3.07 Fines &#038; Penalties. </B>Owners shall pay all charges, fees, fines or penalties assessed by
any Governmental Authority against BSP II, the Operator, or its Affiliates, or their respective
Representatives, except those caused by the Willful Action of Operator.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>3.08 Additional Agreements. </B>Owners shall deliver to Operator a Notice of any Additional
Agreement. Upon delivery of such Notice of Additional Agreement, Operator shall
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 18</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">comply with the
requirements of the applicable provisions of the Additional Agreement in the performance of the
Services, unless compliance would require Operator to act in contradiction to this Agreement.
Owners shall make any such amendments to the then applicable Operating Plan &#038; Budget that is
required by any such Additional Agreement.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>3.09 Notifications. </B>Upon obtaining knowledge thereof, Owners shall as soon as practicable,
but no later than five (5)&nbsp;Business Days after obtaining such knowledge, deliver to the Operator a
Notice of the following:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any litigation, claim, Dispute, action or proceeding concerning BSP II,
Operator, its Affiliates or the Services, which is either pending or threatened and
material;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any refusal, or material threat of refusal, to grant, renew, or extend, or any
pending litigation, claim, Dispute, action or proceeding that might, in the reasonable
opinion of Owners, affect the granting, renewal or extension of any Authorization;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any incident requiring notification of any Governmental Authority in accordance
with Applicable Law;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any notice from any Governmental Authority of any non-routine inspection of BSP
II; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(e)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any other event or circumstance that could be expected, in the reasonable
opinion of Owners, to have a material adverse effect on BSP II, Operator or the
performance of the Services.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>3.10 Audits. </B>Owners (either directly or through a Third Party retained by Owners) shall be
entitled to review and audit all:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>records and reports prepared by Operator in accordance with this Agreement;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>withdrawals by the trustee, at the direction of the Operator, from the Trust
Account;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>amounts paid by Operator directly, or as an agent of Owners, in accordance with
this Agreement;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>payroll and employee compensation records for the BSP Workforce and any
Operator employees that allocate time to BSP II that are not members of the BSP
Workforce;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(e)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>records, reports and accounts relating to costs and expenses incurred by
Operator or its Affiliates in connection with BSP I and the Joint Facilities; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(f)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>all other information regarding costs incurred by or allocated to BSP II;</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">together with any supporting documentation. Any such audit, if conducted on behalf of all Owners,
shall be at the Owners&#146; expense. If, pursuant to such review and audit, it is determined that any
amount previously withdrawn from the Trust Account or paid by Operator directly, or as an agent of
Owners, was done so in breach of this Agreement, Owners may submit a claim to Operator indicating
the amount of the challenged withdrawal or payment and the reasons for such
</DIV>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 19</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">challenge. Operator
shall, not later than thirty (30)&nbsp;days after receiving Notice of such claim, pay Owners in
immediately available funds an amount equal to that portion of the challenged withdrawal or payment
not disputed by Operator in good faith plus the Overdue Payment Rate times the period of time such
overpayment was retained by the Operator. Unless otherwise instructed by Owners, Operator shall
keep all such financial records in a safe and secure place until such time as the Owners may
determine that such records may be disposed of. Any Owner&#146;s failure to audit or review the BSP II
records for any year does not eliminate Owner&#146;s right to audit or review these records in
subsequent years or Owner&#146;s right to reimbursement for amounts withdrawn from the Trust Account in
breach of this Agreement for that year. Any Owner&#146;s failure to detect amounts withdrawn from the
Trust Account in breach of this Agreement during an audit or review does not eliminate Owner&#146;s
right to future reimbursements for such amounts.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>3.11 On-Site Owner Representative. </B>The Owners (or any one or more of them) may designate an
individual to be such Owners&#146; (or Owner&#146;s) On-Site Representative. In no event, however, shall the
Owners designate more than one On-Site Representative at any one time. The Owner or Owners
electing to have an On-Site Representative shall be responsible for all costs associated with
supporting such On-Site Representative, including but not limited to all costs relating to the
On-Site Representative&#146;s salary, benefits, overhead, and insurance. The Operator may, in its sole
discretion, assign the On-Site Representative tasks and projects that are commensurate with the
skills of the On-Site Representative with the goal of utilizing the On-Site Representative as an
efficient resource at the Plant. An On-Site Representative shall have no independent authority to
direct any activities at the Plant, unless expressly directed or assigned to do so by the Operator.
The On-Site Representative shall be permitted full access to all Plant operations, to observe Plant
operations and maintenance, and attend meetings of Plant personnel related to construction,
operation or maintenance of the Plant; provided that the On-Site Representative complies with all
Plant safety practices and does not interfere with Plant construction, operations or maintenance.
Nothing herein shall require the Operator to provide to the On-Site Representative any private
employee information or other information to which the Owners would not otherwise be entitled pursuant to
this Agreement. The On-Site Representative shall, at his or her sole discretion, report information
about construction, operation, maintenance, and other activities at the Plant to the Owner(s) that
have so designated the On-Site Representative. An Owner requesting an On-Site Representative and
the Operator shall enter into such other agreements as are reasonably requested by Operator to
implement this provision.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>3.12 Operation by Owners. </B>In the event, for a period exceeding twenty-four (24)&nbsp;consecutive
hours, Operator fails to operate BSP II at all or substantially all of its full Capacity in breach
of this Agreement or as a result of a strike or other form of labor action by the BSP Workforce,
Owners shall have the right to (a)&nbsp;assume care, custody and control for operation and maintenance
of BSP II and (b)&nbsp;retain such other Persons as Owners, in their reasonable discretion, deem
necessary or advisable for such purposes. Owner shall permit Operator to resume the operation and
maintenance of BSP II when such breach has been cured or such strike or labor action has been
settled, and Operator is capable of resuming the operation and maintenance of BSP II in accordance
with this Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>3.13 Monthly Financial Statements. </B>Operator shall provide the following financial statements
to the Owners on a monthly basis, prepared pursuant to the Federal Energy Regulatory Commission&#146;s
Uniform System of Accounts:
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 20</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>BSP II balance sheet;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>statement of expenses for each month and year-to-date, including a comparison
to budget and explanation of significant variances;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>statement of cash flows; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any other reasonable information requested by the Owners.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>ARTICLE IV</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>OPERATOR RIGHTS &#038; RESPONSIBILITIES</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>4.01 Scope of Services.</B>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Operator shall perform the Services in accordance with this Agreement. The
Services shall include:</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>staffing, training, directing, supervising and otherwise
managing the BSP Workforce personnel as required to operate and maintain and
perform the Services in accordance with this Agreement;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>performing routine preventive and corrective maintenance of the
equipment at BSP II to optimize equipment reliability and availability and
minimize maintenance cost;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>implementing and maintaining a spare parts inventory control system;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iv)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>directing and supervising the work of Operator&#146;s Affiliates
engaged by Operator to perform any portion of the Services;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(v)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>procuring in its own name, or in the name of Owners as Owners&#146;
agent, all fuel, goods and services required to perform the Services in
accordance with this Agreement;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(vi)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>developing coal receipt and measurement procedures;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(vii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>coordinating the activities of Third-Party Suppliers,
including administering procurement agreements;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(viii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>performing such other services or doing such other work as described in the
Pre-Commercial Operation Operating Plan &#038; Budget, the applicable Operating Plan
&#038; Budget, or as Owners may otherwise reasonably request;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ix)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>providing such periodic reports regarding any aspect of BSP II
as are reasonably requested by the Engineering and Operating Committee
(including, without limitation, personnel records of Operator&#146;s employees who
are or have provided services at BSP II, so long as such disclosure does not
violate Applicable Law or any collective bargaining agreement governing such
employee&#146;s employment relationship with Operator (it being understood that such
personnel records may be redacted by Operator</TD>
</TR>


</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 21</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>to remove any personally identifiable information such as names, Social Security Numbers and the like));</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(x)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>performing all other work necessary to operate and maintain BSP II; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(xi)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>if it occurs during the Term, retiring the Plant.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>During the Pre-Commercial Operation Period, the Services shall also include:</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>coordinating and providing general direction of work on the
Project;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>administering and enforcing the Owners&#146; rights under the
Construction Contracts;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>scheduling and conducting monthly progress meetings and
reports for the Engineering and Operating Committee to address procedures,
progress, problems, contractual issues, change orders and scheduling milestones
related to the Project;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iv)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>reviewing and approving monthly progress estimates and requests
by the construction contractors, auditing quality control programs and
monitoring construction safety programs;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(v)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>obtaining or assisting the construction contractor in obtaining
all necessary construction and building permits;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(vi)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>upon notification by any construction contractor that it has
achieved a milestone for its work or a designated portion thereof, verifying
that such event has occurred in accordance with the terms of the applicable
Construction Contract, informing the construction contractor of any
incomplete or unsatisfactory items and, when appropriate or required, obtain
the Engineering and Operating Committee&#146;s consent to approve completion of
such milestone;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(vii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>preparing and delivering to Owners, for comments and approval,
the Proposed Pre-Commercial Operation Operating Plan &#038; Budget;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(viii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>reviewing the Project Documents and preparing and delivering to Owners, for
comments and approval, a written description of the practices and procedures
required to perform the Services in a manner that is consistent with the
requirements of the Project Documents;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ix)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>preparing, reviewing and amending, as needed, and delivering to
Owners, for comments, the BSP II Manuals;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(x)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>preparing and delivering to Owners the Notification Matrix;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(xi)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>preparing and delivering to Owners, for comments and approval,
the Proposed Operating Plan &#038; Budget for the first year of the Term;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(xii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>staffing the BSP Workforce in accordance with this Agreement
and the Pre-Commercial Operation Operating Plan &#038; Budget;</TD>
</TR>


</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 22</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">

    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(xiii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>training the BSP Workforce in accordance with the BSP II Manuals;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(xiv)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>participating in the commissioning, start-up and testing of
BSP II;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(xv)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>procuring environmental allowances as per the Agreement of
Representation attached hereto as <B>Schedule&nbsp;4.01</B>; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(xvi)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>conducting testing and maintaining MAPP accreditation of the
Plant.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The Operator shall have the authority to enter into agreements and to execute
documents for expenditures authorized under this Agreement, on behalf of the Owners for
transactions involving less than Five Hundred Thousand Dollars ($500,000). Agreements
in excess of such amounts must be approved in advance by the Engineering and Operating
Committee. Agreements for expenditures that are part of an approved budget shall be
deemed to be approved for purposes of this Section&nbsp;4.01(c).</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>4.02 Operational Standards. </B>Operator shall perform the Services in accordance with:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>all Applicable Laws and Authorizations;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>this Agreement, including the operational principles (which shall be developed
before Commercial Operation) established by the Engineering and Operating Committee;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the BSP II Manuals;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the Pre-Commercial Operation Operating Plan &#038; Budget or the applicable Annual
Operating Plan &#038; Budget;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(e)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Prudent Utility Practice;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(f)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the requirements, if any, of the insurer insuring BSP II (including BSP II&#146;s
share of the Joint Facilities) and the Parties in connection with their BSP II-related
activities;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(g)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Manufacturers&#146; Recommendations;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(h)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the requirements of the Project Documents; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any other reasonable request made by Owners.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>4.03 Personnel.</B>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>All individuals employed by Operator or its Affiliates to perform the Services
shall be qualified to perform the duties to which they are assigned. Such
qualifications shall include the possession and maintenance of any individual or
personal licenses or permits required by Applicable Law. Operator shall not adversely
discriminate against BSP II, in the assignment of BSP Workforce personnel, and Operator
shall establish a rotation system to ensure that BSP I, BSP II, and the Joint
Facilities receive equitable treatment with respect to the assignment of BSP Workforce
personnel.</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 23</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Operator shall have the sole right and responsibility to manage labor relations
and determine working hours, employee benefits, rates of compensation and all other
personnel-related matters.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Operator shall only charge Labor Expenses to the Owners, to the extent they
represent direct, legitimate and verifiable services for the benefit of BSP II, and
Operator shall cause each member of the BSP Workforce and any other applicable
personnel to maintain time reports in sufficient detail to verify the actual time
worked in connection with BSP II and any applicable Joint Facilities.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>4.04 Plant Manager. </B>Not later than thirty (30)&nbsp;days after the Effective Date, Operator shall
appoint an individual as the Plant Manager. Operator&#146;s selection of the initial Plant Manager, and
all subsequent Plant Managers, shall be subject to the approval of the Owners, which shall not be
unreasonably withheld. The Plant Manager shall (a)&nbsp;be authorized to act for and on behalf of
Operator in all matters concerning performance of the Services and (b)&nbsp;direct and manage Operator&#146;s
resources in the performance of the Services. Operator shall be bound by the communications,
directions, requests and decisions made by the Plant Manager; provided that the Plant Manager shall
have no authority to amend or waive any provision of this Agreement. Operator shall also designate
at least one alternate to the Plant Manager who shall, at all times, act as the Plant Manager in
the unavailability of the Plant Manager. Operator shall deliver to Owners a written Notice of the
identity of the Plant Manager and the alternates thereto along with specific instructions as to how
each such individual can be reached at all times.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>4.05 Training. </B>Subject to the limitations of the Pre-Commercial Operation Operating Plan &#038;
Budget or the applicable Operating Plan &#038; Budget and this Agreement, Operating Expenses shall
include costs and expenses incurred by Operator in connection with training the BSP Workforce for
their duties in connection with BSP II, including costs of Third-Party Suppliers engaged by
Operator in connection with such training programs.
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>Initial Training. </B>During the Pre-Commercial Operation Period, Operator shall
conduct an initial training program to prepare the BSP Workforce participants for
performing the Services in accordance with this Agreement. Wherever reasonably
practicable, such initial training program shall be conducted in conjunction with the
manufacturer of the major equipment incorporated as part of BSP II.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>Ongoing Training. </B>Following the initial training provided in accordance with
Section&nbsp;4.05(a), Operator shall offer an ongoing training program for the BSP Workforce
participants which shall be described in greater detail in the BSP II Manuals. This
training program shall include an orientation element and emphasize, among other
things, safety, environmental compliance, operation and maintenance skills and the
fundamental economics of BSP II.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>4.06 Procurement.</B>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>General. </B>All goods and services required for performance of the Services in
accordance with this Agreement that the BSP Workforce personnel and other Operator
personnel are either unavailable or unqualified to supply directly, shall be procured
by Operator in accordance with this Agreement. All such</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 24</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 6%">procurements shall also be in
accordance with and subject to the limitations of the Pre-Commercial Operation
Operating Plan &#038; Budget or the applicable Operating Plan &#038; Budget. Operator shall
include in the Pre-Commercial Operation Operating Plan &#038; Budget and each Operating Plan
&#038; Budget:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>a brief description of all major goods and services to be
procured during the period covered by the Pre-Commercial Operation Operating
Plan &#038; Budget or the applicable Operating Plan &#038; Budget;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>a list of previously qualified and pre-approved Third-Party Suppliers; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>standard terms and conditions for the procurement of goods and
services from Third-Party Suppliers.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Operator shall prepare and include, as part of each supply agreement, specifications
and other terms and conditions, including, if deemed appropriate by Operator,
minimum performance and warranty requirements.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>Operator Affiliate Supply Agreements. </B>All goods and services supplied by an
Affiliate of Operator shall be supplied in accordance with a written agreement between
Operator and the supplier. All such supply agreements shall be subject to the approval
of Owners.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>Competitive Bids. </B>Operator shall prepare a written request for bids for each
procurement of goods or services with a term greater than one (1)&nbsp;year or an estimated
purchase price and contract value in excess of an amount set by the Engineering and
Operating Committee from time to time. Such requests shall include:</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the minimum specification requirements;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the terms and conditions of the supply agreement;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>a request for a quotation for providing the requested goods or services; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iv)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>a request for the Third-Party Supplier&#146;s qualifications and experience.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Operator shall evaluate all responses and select the successful bidder. Prior to
the execution thereof, Operator shall obtain Owners&#146; approval for each expenditure
with a value in excess of Five Hundred Thousand Dollars ($500,000).</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>For all expenditures requiring Owners&#146; prior approval, Operator shall prepare a
summary of the responses to Operator&#146;s request for bids and a description of the
terms and conditions of the supply agreement to the extent such terms and conditions
are materially different than the standard terms and conditions as set forth in this
Agreement or contained within the applicable Operating Plan &#038; Budget.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>Supply Agreement Administration. </B>Operator shall administer all agreements for
the supply of goods and services procured by Operator in accordance with this Section
4.06, including:</TD>
</TR>


</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 25</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>scheduling and coordinating the work, including the delivery of goods;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>inspecting all goods and services for compliance with the
supply agreement specifications and other terms and conditions;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>enforcing material supply agreement terms and conditions,
including warranty provisions; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iv)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>advising Owners of any potential material claims against a
Third-Party Supplier for such Third-Party Supplier&#146;s failure to perform in
accordance with such supply agreement, and assisting Owners in investigating,
pursuing, preserving and litigating or arbitrating, if necessary, such claims.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(e)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>Supplier Invoices. </B>Operator shall promptly review and approve invoices from
Third-Party Suppliers. Operator shall endeavor to resolve any Third-Party Supplier
invoice conflicts or errors as quickly as is reasonably practicable.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(f)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>Supplier Insurance. </B>Prior to any Third-Party Supplier beginning work at BSP
II, Operator shall obtain certificates that verify the existence of insurance
protection required by the applicable supply agreement. Operator shall arrange for
transportation insurance to cover the replacement value of any goods damaged or
lost during the transportation of such goods to the Site to the extent such
insurance protection is not provided by the supplier or shipper of such goods.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(g)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>Emergencies. </B>Nothing in this Section&nbsp;4.06 shall be deemed to limit Operator&#146;s
rights or obligations to respond to Emergencies as set forth herein or to restrict
Operator&#146;s ability to contract directly, or indirectly as Owners&#146; agent, for goods or
services required for responding to an Emergency.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>4.07 Records and Reports.</B>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>Financial. </B>Operator shall maintain complete and accurate financial records of
all costs, including expenses, associated with performing the Services. Operator shall
prepare and deliver to Owners detailed financial reports in a form and at intervals
requested by Owners. Operator shall keep all such financial records in a safe and
secure place until such time as the Owners may determine that such records may be
disposed of and shall make such records available to Owners for inspection, audit and
copying at reasonable times and as set forth in Section&nbsp;3.10.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>Performance. </B>Operator shall maintain accurate written (or electronic) records
of the performance of BSP II, including records associated with operation and
maintenance, environmental compliance and safety incidents as are required by
Applicable Law. Operator shall prepare and deliver to Owners performance reports in a
form and at reasonable intervals requested by Owners. Operator shall keep all
performance-related records in a safe and secure place until such time as the Owners
may determine that such records may be disposed of and shall make such records
available to Owners for inspection, audit and copying at reasonable times and as set
forth in Section&nbsp;3.10.</TD>
</TR>


</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 26</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>As-Built Plans &#038; Specifications. </B>Operator shall maintain in a safe and secure
place BSP II as-built plans and specifications and the plans and specifications for
major modifications or additions to the Facilities. The As-Built Plans and
Specifications are the property of Owners and shall remain at the Facility upon
termination of this Agreement.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>4.08 BSP II Manuals. </B>Operator shall, from time to time, amend the BSP II Manuals to reflect
changes to BSP II, Applicable Law and Prudent Utility Practice. The BSP II Manuals, and any
amendments or supplements thereto, shall be subject to review, comment and approval by Owners. The
BSP II Manuals are the property of Owners and shall remain at BSP II upon termination of this
Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>4.09 Authorizations. </B>Operator shall apply for, obtain and maintain all Authorizations which
are required under Applicable Law to be obtained and maintained by Operator, its Affiliates or
their respective Representatives in order for Operator to perform the Services. Operator shall, at
Owners&#146; reasonable request, assist Owners in applying for, obtaining and maintaining Authorizations
obtained and maintained by Owners in accordance with Section&nbsp;3.06.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>4.10 Notifications. </B>Operator shall, as soon as is reasonably practicable after obtaining
knowledge thereof, notify the Engineering and
Operating Committee and thereafter, in accordance with the Notification Matrix, deliver to
Owners Notice of the following:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any litigation, claim, Dispute, action or proceeding by any Person, concerning
BSP II, the Joint Facilities, a Party or the Services that is either pending or
threatened and material;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any (i)&nbsp;suspension or revocation, (ii)&nbsp;refusal to
grant, renew, or extend, or (iii) pending litigation, claim, Dispute, action or proceeding, in each such case
that might, in the reasonable opinion of Operator, result in the suspension or
revocation, or affect the granting, renewal or extension of any relevant
Authorization;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any bona fide or material threat of (i)&nbsp;a suspension or revocation, (ii)&nbsp;a
refusal to grant, renew, or extend, or (iii)&nbsp;litigation, claim, Dispute, action or
proceeding, that, in each case, is likely, in the reasonable opinion of Operator, to
result in a suspension or revocation, or affect the granting, renewal or extension, of
any Authorization;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any notice from any Governmental Authority of any alleged violation of
Applicable Law or any imposition of any material fine or penalty that is assessed by
any Governmental Authority against BSP II, Operator or a Party, its Affiliates or their
respective Representatives;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(e)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any Emergency;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(f)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any Force Majeure Event;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(g)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any unscheduled BSP II outage and any acceleration, postponement or extension
of a scheduled BSP II outage;</TD>
</TR>


</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 27</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(h)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any incident of death or serious injury or damage at the Site or that is
likely, in the reasonable opinion of Operator, to have a material adverse effect on BSP
II, a Party or the performance of the Services in accordance with this Agreement;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any incident requiring notification of any Governmental Authority in accordance
with Applicable Law;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(j)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any notice from any Governmental Authority of any non-routine inspection of BSP
II or records related to BSP II;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(k)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any potential shortage of fuel or utilities which Owners are required to make
available in accordance with the terms hereof;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(l)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any current or potential non-compliance with the Pre-Commercial Operation
Operating Plan &#038; Budget or applicable Operating Plan &#038; Budget;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(m)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any default or potential default under any Project Document or any breach or
potential breach of such documents;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(n)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any unauthorized access to the Site or other breach of Site security;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(o)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any actual or threatened labor Dispute relating to the BSP Workforce or BSP I,
BSP II, or the Joint Facilities;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(p)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any material violation of any Authorization or Applicable Law;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(q)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any material damage to any component of BSP II; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(r)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any other event or circumstance occurring at BSP I, BSP II, the Joint
Facilities, or elsewhere that could be expected, in the reasonable opinion of Operator,
to have a material adverse effect on BSP II, a Party or the performance of the
Services.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>4.11 Emergency Actions. </B>In the event of an Emergency, Operator:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>shall take prompt action, in accordance with Applicable Law and Prudent Utility
Practice, to attempt to stabilize the situation and avoid or mitigate damage, injury or
loss to Persons or equipment;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>notwithstanding any other provision of this Agreement to the contrary, may
incur any reasonable expenditure or take any other action as Operator reasonably deems
necessary or appropriate as required to achieve the objectives set forth in clause (a)
of this Section&nbsp;4.11, and such expenditures shall be deemed to be Operating Expenses;
provided that Operator shall, to the extent practicable in light of the circumstances
constituting the Emergency, minimize such expenditures and obtain Owners&#146; prior
approval of such expenditures; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>shall include within the notification of Owners required by Section&nbsp;4.10 a
description of the Emergency, any response proposed or taken by Operator, any
expenditures incurred by Operator, or expected to be incurred by Operator, in
connection with such Emergency and any consequences resulting from or expected to
result from such Emergency and Operator&#146;s response thereto.</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 28</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>4.12 Cooperation in Financing.</B>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Upon the request of an Owner, Operator shall execute and deliver to a Lender
the Lenders&#146; Consent. The Lenders&#146; Consent shall provide that Operator:</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>consents to the grant to the Lender of a security interest in,
to and over the applicable Owner&#146;s rights under this Agreement;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>agrees that prior to any suspension of the Services or
termination of this Agreement by Operator, Operator shall notify each Lender of
such suspension or termination and give the Lenders a right to cure the cause
for such suspension or termination or to take such other actions as may be
required by the Lenders to mitigate the consequences from or avoid such
suspension or termination; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>consents to the exercise by a Lender of Owners&#146; rights under
this Agreement, or the replacement of the applicable Owner there under by the
Lender, and to the right of the Lender to assume all the rights and
obligations of Owners under this Agreement.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Upon the request of an Owner, Operator shall, at the requesting Owner&#146;s expense:</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>execute such documents or instruments as are customarily
required to give effect to the Lenders&#146; Consent;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>cause counsel acceptable to the Lender to deliver to the Lender
a legal opinion concerning this Agreement and the Lenders&#146; consent, which
opinion shall be in a form satisfactory to the Lender; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>prepare and provide to the Lender such information in
connection with this Agreement or the performance of the Services as may be
required by the Lender.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">Operator shall cooperate with Owners in good faith in order to satisfy the requirements of Owners&#146;
financing arrangements, including, where appropriate, the making of such amendments to the terms of
this Agreement as may be required by any Lender. Nothing in this Section&nbsp;4.12 shall be deemed to
require Operator to agree to any amendments to this Agreement that would adversely affect
Operator&#146;s risks, rights or obligations under this Agreement.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>4.13 Cooperation Following Termination. </B>Upon the termination of this Agreement for whatever
reason, Operator shall, at Owners&#146; expense, (i)&nbsp;turn over operation and maintenance of BSP II to
the Successor Operator, if any; and (ii)&nbsp;execute and deliver documents and take other actions, in
each case as necessary to facilitate the orderly transition of duties from Operator to the
Successor Operator, including:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>promptly deliver to Owners or the Successor Operator (if so directed by
Owners), all work, property and recorded information, which are in Operator&#146;s
possession or under its control, including records and reports and the BSP II Manuals
prepared in accordance with Sections&nbsp;4.07 and 4.08, respectively; and</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 29</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>transfer, or cause the transfer, to Owners or the Successor Operator (if so
directed by Owners), all rights and obligations of Operator, its Affiliates and their
respective Representatives under all contracts entered into and Authorizations held by
such Person in connection with the performance of the Services; provided that Owners
shall assume, or shall cause the Successor Operator to assume, all such rights and
obligations and provided the Owners obtain the release of Operator from all such
obligations pertaining to the BSP Workforce.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">Upon the termination of this Agreement, Operator shall, at the request of Owners, at Owners&#146;
expense, and for a period not to exceed sixty (60)&nbsp;days, train the Successor Operator. However, if
the termination is a result of an Operator Event of Default, then the costs of complying with this
Section&nbsp;4.13 shall be borne exclusively by Operator.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>4.14 Liens or Encumbrances. </B>Operator shall keep and maintain BSP II free and clear of all
liens and encumbrances resulting from performance of the Services to the extent such Services are
performed directly by Operator or, to the extent that Owners have deposited funds adequate therefor in the Trust Account, by
a Third-Party Supplier in accordance with a subcontract between Operator and such Third-Party
Supplier.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>4.15 Authority Limitations. </B>Notwithstanding any provision in this Agreement to the contrary,
unless specifically provided for in the Pre-Commercial Operation Operating Plan &#038; Budget or the
applicable Operating Plan &#038; Budget, or as otherwise specifically approved or directed by Owners in
writing, Operator shall not directly, or as an agent of Owners, and shall ensure that its
Affiliates and Representatives do not:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>sell, lease, pledge, mortgage, convey, or make any license, exchange or other
transfer or disposition of any property or assets of Owners, its Affiliates or
Representatives, including any property or assets purchased by Operator in accordance
with this Agreement;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>make, enter into, execute, amend, modify or supplement any contract or
agreement (including any labor or collective bargaining agreement) on behalf of or in
the name of Owners;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>incur, consent to or agree to any cost or expense directly or as agent of
Owners that is to the account of Owners, its Affiliates, or otherwise recoverable from
such Person, except for Operating Expenses and cost and expenses otherwise authorized
or permitted under this Agreement;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>settle, compromise, assign, pledge, transfer, release or consent to the
compromise, assignment, pledge, transfer or release of, any claim, suit, debt, demand
or judgment against or due by, Owners or Operator, the cost of which is to the account
of Owners, its Affiliates, or otherwise recoverable from such Persons; or submit any
such claim, Dispute or controversy to arbitration or judicial process, or stipulate in
respect thereof to a judgment, or consent to do the same;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(e)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>engage in any other transaction on behalf of or as an agent for Owners except
as specifically provided for in this Agreement or as specifically directed by Owners in
writing; or</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 30</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(f)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>issue or make any public announcements or statements regarding BSP II, Owners,
their Affiliates, the Services or this Agreement, unless, prior thereto, Owners have
been furnished with a copy thereof and have approved the same.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>ARTICLE V</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>BUDGET AND OPERATING PLAN PROCEDURES</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>5.01 Pre-Commercial Operation.</B>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>Proposed Pre-Commercial Operation Operating Plan &#038; Budget. </B>As soon as
reasonably practical but in no event later than twelve (12)&nbsp;months prior to the date
of Commercial Operation, Operator shall prepare and deliver to Owners the Proposed
Pre-Commercial Operation Operating Plan &#038; Budget. The Proposed Pre-Commercial
Operation Operating Plan &#038; Budget shall include:</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>a staffing plan;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>a description of the Services to be performed during the
Pre-Commercial Operation Period, a schedule for completion of such Services and
an estimate, including a reasonable contingency, of the Operating Expenses to
be incurred in connection with performing such Services;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>a description of the Services to be performed by an Affiliate
of Operator or Third-Party Supplier on a cost recoverable basis together with
an estimate of the cost of such Services;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iv)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any other information which Owners may reasonably request be
included in the Proposed Pre-Commercial Operation Operating Plan &#038; Budget; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(v)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>in preparing the Proposed Pre-Commercial Operation Operating
Plan &#038; Budget, Operator shall separately account for capital expenditures and
operating expenditures.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>Approval. </B>Not later than forty-five (45)&nbsp;days after receiving the Proposed
Pre-Commercial Operation Operating Plan &#038; Budget, Owners shall either approve the
Proposed Pre-Commercial Operation Operating Plan &#038; Budget or provide Operator with its
reasons for withholding approval and the changes to the Proposed Pre-Commercial
Operation Operating Plan &#038; Budget required to obtain Owners approval. Any Disputes
regarding the Pre-Commercial Operation Operating Plan &#038; Budget not resolved by the
Parties within twenty (20)&nbsp;days following Operator&#146;s receipt of Owners&#146; comments shall
be resolved in accordance with Article&nbsp;XI. The Proposed Pre-Commercial Operation
Operating Plan &#038; Budget may be approved in whole or in part in order to not
unreasonably delay the performance of the Pre-Commercial Operation Period Services.
The portions of the Proposed Pre- Commercial Operation Operating Plan &#038; Budget approved
by the Parties shall constitute the Pre-Commercial Operation Operating Plan &#038; Budget.</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 31</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>5.02 Operations Period.</B>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>Proposed Operating Plan &#038; Budget. </B>Not later than forty-five (45)&nbsp;days prior to
the date of Commercial Operation and thereafter not later than July 1<SUP style="font-size: 85%; vertical-align: text-top">st</SUP> of
each year during the Term, Operator shall prepare and deliver to Owners the Proposed
Operating Plan &#038; Budget for performing the Services during the period beginning with
the date of Commercial Operation and for the remainder of the year in which such date
occurs, in the first instance, and during the following year in each subsequent case.
The Owners shall provide Operator with the operating schedule estimate for BSP II at
least thirty (30)&nbsp;days prior to budget submittal. The operating plan component of the
Proposed Operating Plan &#038; Budget shall include:</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any staffing plan revisions;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the Notification Matrix;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>a description of and plan for Non-Recurring Operating Expenses
(including (A)&nbsp;Plant betterments and other additions, replacements and
alterations, (B)&nbsp;major maintenance repairs and replacements) for the next year
and each of the subsequent four (4)&nbsp;years, and (C)&nbsp;spare parts in the aggregate
in excess of Two Hundred Fifty Thousand Dollars ($250,000);</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iv)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>a description of the Services, and proposed budget, to be
performed by an Affiliate of Operator on a cost recoverable basis during the
period to which the Proposed Operating Plan &#038; Budget applies;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(v)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>a list of the Third-Party Suppliers to be engaged to provide
major goods or services valued at over One Hundred Thousand Dollars ($100,000)
during the period to which the Proposed Operating Plan &#038; Budget applies;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(vi)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>all cost allocations between BSP I and BSP II;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(vii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any other information which Owners may reasonably request be
included in the Proposed Operating Plan &#038; Budget; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(viii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>in preparing the Proposed Operating Plan &#038; Budget, Operator shall separately
account for capital expenditures and operating expenditures.</TD>
</TR>

</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 6%">The budget components of the Proposed Operating Plan &#038; Budget shall be prepared on a
cost basis and shall include: (1)&nbsp;an estimate, on a monthly as well as an annual
basis, of the Operating Expenses, prepared pursuant to the Federal Energy Regulatory
Commission Uniform System of Accounts, to be incurred during the applicable period
in connection with performance of the Services; and (2)&nbsp;a reasonable contingency
separately identified and quantified.
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>Operating Plan &#038; Budget Approval.</B></TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Not later than thirty (30)&nbsp;days after receiving the Proposed
Operating Plan &#038; Budget, Owners shall either approve the Proposed Operating
Plan &#038; Budget or provide Operator in writing with its reasons for withholding</TD>
</TR>


</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 32</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>approval and the changes required to obtain Owners&#146; approval. The Owners, as
part of the process of approving the Proposed Operating Plan &#038; Budget, shall
set reasonable annual performance standards for the Operator within one or more
Key Performance Indicators listed on <B>Schedule&nbsp;5.</B><B>02(b)(i)</B>. Any Disputes
regarding the Proposed Operating Plan &#038; Budget not resolved by the Parties
within thirty (30)&nbsp;days following Operator&#146;s receipt of Owners&#146; comments shall
be resolved in accordance with Article&nbsp;XI. The portions of the Proposed
Operating Plan &#038; Budget approved by the Parties shall constitute the Operating
Plan &#038; Budget respectively for the applicable year.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The Parties agree to amend, from time to time, the Operating
Plan &#038; Budget as appropriate to reasonably account for, in a timely manner,
unanticipated circumstances, including, but not limited to, changes in
Applicable Law, Emergencies, and Force Majeure Events.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>Default Budget. </B>Beginning with the year following the year in which the date
of Commercial Operation occurs, if the Parties have not agreed upon a cost budget to be
included in as part of the Operating Plan &#038; Budget by January 1 of the year to which
such Operating Plan &#038; Budget applies, then the Default Budget shall be deemed to be the
approved budget until such time as the Parties agree on a cost budget for such year or
the budget-related Disputes between the Parties have been resolved in accordance with
Article&nbsp;XI. The Default Budget shall be prepared by Operator and delivered to Owners
not later than seven (7)&nbsp;days prior to the first day of the period to which the Default
Budget applies. The Default Budget, which shall be prorated for the year in which this
Agreement is terminated, shall be equal to the actual Operating Expenses incurred
during the preceding year (annualized in the event such preceding year is less than a
full year) increased by the same percent as the percent increase, if any, in the
Escalation Factor during the twelve (12)&nbsp;month period ending with the most recent
September&nbsp;30, and adjusted to (i)&nbsp;delete any Non-Recurring Operating Expense incurred
during the preceding year, if such non-recurring expense, in the reasonable opinion of
Operator, is not expected to be incurred during the applicable year, (ii)&nbsp;add any
Non-Recurring Operating Expense scheduled to be incurred during the applicable year as
such amount is set forth in the most recent Operating Plan &#038; Budget and (iii)&nbsp;delete
(without duplication of the adjustments made in accordance with (i)&nbsp;and (ii)&nbsp;of this
Section&nbsp;5.02(c)) the impact of any Emergency, Force Majeure Event, time that BSP II was
not operating, or suspension of Services that occurred during the preceding year. The
Operator Incentive component of the Default Budget shall be the same as the Operator
Incentive component of the Operating Plan &#038; Budget for the immediately preceding year.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>ARTICLE VI</B>
</DIV>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 33</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>CONSIDERATION</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>6.01 Compensation</B>. For performance of its duties hereunder, Operator shall be entitled to
receive payment for all Operating Expenses.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>ARTICLE VII</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>INSURANCE</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>7.01 Provided by Owners.</B>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>During the Term, Owners shall jointly procure or cause to be procured and
maintain in full force and effect insurance protection with coverage no less than the
amounts set forth below.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Builders Risk (including testing) &#150; during all periods of
construction on the entire Project on a completed value basis and covering the
full insurable replacement cost thereof;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Property Damage, including Boiler and Machinery &#150; covering the
full insurable replacement cost, but in no case will the limit be less than the
maximum foreseeable loss for each occurrence and in the annual aggregate (as
determined by an independent consultant);</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Commercial General Liability &#150; One Million Dollars
($1,000,000) each occurrence and in the annual aggregate;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iv)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Umbrella and Excess Liability &#150; Fifty Million Dollars
($50,000,000) each occurrence and in the annual aggregate through a combination
thereof; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(v)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Earthquake and flood insurance &#150; as may be determined by the
E&#038;O Committee.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The insurance protection provided by Owners in accordance with this Section
7.01 shall also:</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>name, as additional insured, Operator, its Affiliates and their
respective Representatives as each such Person&#146;s interest may appear, and
contain a waiver of subrogation in favor of each such Person;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>be primary with respect to any other insurance;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>provide for Operator to be notified in writing at least sixty
(60)&nbsp;days prior to any modification, termination or cancellation of insurance
coverage; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iv)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>be subject to a deductible no greater than Two Million Five
Hundred Thousand Dollars ($2,500,000), if any.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">Owners shall provide Operator with certificates of insurance that verify the full force and effect
of coverage required by this Section&nbsp;7.01.
</DIV>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 34</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt">Subject to the approval of the E&#038;O Committee, the insurance required by this Section&nbsp;7.01 shall be
procured by Operator for the benefit of the Owners and to the extent possible may be purchased as
part of Operator&#146;s overall company insurance program, and/or in conjunction with the insurance
covering BSP I. If the Operator procures insurance on behalf of the Owners, the
Operator shall provide Owners with certificates of insurance that verify the full force and effect
of coverage required by this Section&nbsp;7.01.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>7.02 Provided by Operator. </B>Without duplication of the insurance protection provided in
accordance with Section&nbsp;7.01, during the Term Operator shall obtain and maintain in full force and
effect insurance protection with coverage no less than the amounts set forth below.
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Commercial General Liability, Umbrella and Excess Liability &#150; Ten Million
Dollars ($10,000,000) each occurrence and in the annual aggregate, and with deductibles
no greater than Two Million Five Hundred Thousand Dollars ($2,500,000);</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Automobile Liability &#150; One Million Dollars ($1,000,000) combined single limit
(for owned, if any, hired and non-owned automotive equipment), and with deductibles no
greater than Ten Thousand Dollars ($10,000);</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Workers&#146; Compensation (or the local equivalent) &#150; in such amounts and form as
required by Applicable Law; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Fiduciary liability &#150; Three Million Dollars ($3,000,000) aggregate liability
limit.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">The policies obtained and maintained to provide the protection required by this Section&nbsp;7.02 shall
not necessarily be specific to the Project. Operator may satisfy all or any requirement for
insurance required by this Section&nbsp;7.02 through a qualified self-insurance program; provided,
however, that Operator must obtain the prior written approval of the Owners if the amount of
self-insurance applying to any such requirement, in each instance, exceeds One Million Dollars
($1,000,000), and the Operator shall be liable to the Owners for any amounts due them hereunder as
if such self-insurance were an insurance policy purchased from a Third Party. The Owners may
require additional coverages, endorsements, minimum limits and deductibles, in their sole
discretion, provided such is reasonably available in the insurance market and provided the Owners
are responsible for the costs thereof. Operator shall provide Owners with certificates of
insurance that verify the full force and effect of the coverage required by this Section&nbsp;7.02, or
for any self-insurance, Operator shall provide Owners such information as Owners shall reasonably
request.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>7.03 Premiums &#038; Deductibles. </B>With respect to insurance coverage provided in accordance with
Sections&nbsp;7.01 and 7.02:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>insurance policy premiums (including the incremental premiums paid by Operator
with respect to its general corporate insurance policies that are specifically
attributable to its performance of the Services), self-insured retentions, claims not
covered by insurance and insurance policy claim deductible amounts, except as provided
for in (b)&nbsp;of this Section&nbsp;7.03, shall be paid directly by Owners or deemed to be an
Operating Expense and paid by Operator with funds withdrawn from the Trust Account; and</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 35</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant
</FONT></DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>subject to the limitations on the total liability of Operator under this
Agreement, Operator shall pay any insurance policy claim deductible amounts to the
extent such claim is the result of Operator&#146;s Willful Action and such amount shall not be
reimbursed by Owners.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>7.04 Replacement Insurance By Operator. </B>In the event the insurance protection required by
Section&nbsp;7.01 is suspended, terminated or expires and is not promptly renewed, Operator shall have
the right, subject to five (5)&nbsp;days advance Notice to Owners, but not the obligation, to acquire
replacement insurance substantially in conformance with the requirements of Section&nbsp;7.01 and all
reasonable costs and expenses incurred by Operator in obtaining such replacement insurance shall be
deemed to be Operating Expenses provided that such actions are taken only to the extent of and for
so long as there is a lapse in the insurance protection required by Section&nbsp;7.01.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>7.05 Replacement Insurance By Owner. </B>In the event the insurance protection required by
Section&nbsp;7.02 is suspended, terminated or expires and is not promptly renewed, Owner shall have the
right, subject to five (5)&nbsp;days advance Notice to Operator, but not the obligation, to acquire
replacement insurance substantially in conformance with the requirements of Section&nbsp;7.02, provided
that such actions are taken only to the extent of and for so long as there is a lapse in the
insurance protection required by Section&nbsp;7.02.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>ARTICLE VIII</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>INDEMNIFICATIONS</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>8.01 Owners&#146; Indemnification</B>. With respect to the subject matter of this Agreement, Owners
shall protect, defend, indemnify and hold harmless to the extent of the ownership share of each
Owner in BSP II, each Operator Indemnitee from and against Losses and Third-Party Losses arising
out of, related to, or resulting from the negligence or Willful Action of Owners or their
respective Representatives with respect to the subject-matter of this Agreement, or arising out of,
related to, or resulting from the performance (or non-performance) of Owners&#146; obligations under
this Agreement by Owners or their Representatives, except to the extent that such Losses or
Third-Party Losses arise out of or result from the Willful Action by or of Operator. Operator
shall have the right to seek compensation therefor, the amount of which shall not include any
insurance proceeds Operator has received therefor; provided, however, that Operator shall have the
right to also receive any insurance proceeds Owners may receive in connection with an
indemnification claim made by Owners hereunder.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>8.02 Operator Indemnification. </B>Operator shall protect, defend, indemnify and hold harmless
each Owner Indemnitee from and against Losses and Third-Party Losses arising out of, related to, or
resulting from the Willful Action of Operator. Owners shall have the right to seek compensation
therefor, the amount of which shall not include any insurance proceeds Owners have received
therefor; provided, however, that Owners shall have the right to also receive any insurance
proceeds Operator may receive in connection with an indemnification claim made by Operator
hereunder.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>8.03 Comparative Liability. </B>If a Party incurs Losses or is liable for Third-Party Losses due
to the joint, concurring, comparative or contributory negligence or Willful Action of
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 36</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">another Party, the liability for such Losses
or Third-Party Losses shall, as applicable, be allocated between Operator and Owners in proportion
to their respective degrees of joint, concurring, comparative or contributory negligence or Willful
Action contributing to such Losses or Third-Party Losses. If Losses or Third-Party Losses occur due
to Willful Action of Operator and Willful Action and/or negligence of Owner, then any
indemnification obligations therefor shall be determined pursuant to Sections&nbsp;8.01 and 8.02 hereof.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>8.04 Notice and Participation.</B>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>If any Indemnified Party intends to seek indemnification under this Article
from an Indemnifying Party with respect to any action or claim by a Third Party, the
Indemnified Party shall give the Indemnifying Party Notice of such claim or action upon
the receipt of actual knowledge or information by the Indemnified Party of a possible
claim that the Indemnifying Party reasonably concludes is likely to be made or of the
commencement of a claim or action, which Notice shall in no event be delivered later
than the first to occur of (i)&nbsp;thirty (30)&nbsp;days prior to the last day for responding to
such claim or action or (ii)&nbsp;the expiration of the first half of the period allowed for
responding to such claim or action. The Indemnifying Party shall have no liability
under this Article for any Third-Party Loss for which such Notice is not provided to
the extent that the failure to give such Notice materially prejudices the Indemnifying
Party.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The Indemnifying Party shall have the right to assume the defense of any Third
Party claim or action, at its sole cost and expense, with counsel designated by the
Indemnifying Party and reasonably satisfactory to the Indemnified Party; provided that
if the defendants in any such action include both the Indemnified Party and the
Indemnifying Party, and the Indemnified Party shall have reasonably concluded that
there may be legal defenses available to it which are different from or additional to
those available to the Indemnifying Party, the Indemnified Party shall have the right
to select separate counsel, at the Indemnifying Party&#146;s expense, to assert such legal
defenses and to otherwise participate in the defense of such action on behalf of such
Indemnified Party.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Except to the extent expressly provided herein, no Indemnified Party shall
settle any claim or action with respect to which it has sought or intends to seek
indemnification pursuant to this Agreement without the prior written consent of the
Indemnifying Party.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Should any Indemnified Party be entitled to indemnification under this Article
VIII as a result of a claim or action by a Third Party, and should the Indemnifying
Party fail to assume the defense of such claim or action, the Indemnified Party may, at
the expense of the Indemnifying Party, contest (or, with or without the prior consent
of the Indemnifying Party, settle) such claim or action.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(e)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Except to the extent expressly provided herein, no Indemnifying Party shall
settle any claim or action with respect to which it may be liable to provide
indemnification pursuant to this Agreement without the prior written consent of
the Indemnified Party; provided that if the Indemnifying Party has reached a bona</TD>
</TR>


</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 37</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>fide settlement agreement with the plaintiff(s) in any such action and the
Indemnified Party does not consent to such settlement agreement, then the amount
specified in the settlement agreement, plus the Indemnified Party&#146;s attorney&#146;s fees
costs, shall act as an absolute maximum limit on the indemnification obligation of
the Indemnifying Party with respect to the claim, or portion thereof, that is the
subject of such settlement agreement.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>8.05 Net Amount. </B>In the event that an Indemnifying Party is obligated to indemnify and hold
any Indemnified Party harmless under this Article&nbsp;VIII, the amount owing to the Indemnified Party
shall be the amount of such Indemnified Party&#146;s actual out-of-pocket cost incurred in connection
with the indemnified Losses or Third-Party Losses, net of any insurance or other recovery actually
received by the Indemnified Party.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>ARTICLE IX</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>DEFAULTS &#038; REMEDIES</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>9.01 Operator Events of Default. </B>The following shall constitute events of default on the part
of Operator (each, an &#147;Operator Event of Default&#148;) under this Agreement:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Operator fails to pay, within five (5)&nbsp;days following the date on which such
payment is due, any amount that is due to Owners under this Agreement and has not been
disputed in good faith by Operator;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Willful Action by Operator in connection with the performance of the Services
(other than in connection with a default described in Sections&nbsp;9.01(a) and 9.01(c));</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Operator commits a material breach of its obligations under this Agreement
(other than a default described in Section&nbsp;9.01(a) or (b)) unless not later than five
(5)&nbsp;days after the delivery of a Notice from Owners of such breach, Operator commences,
and thereafter diligently pursues a cure of such breach and the effects of such breach
are cured within thirty (30)&nbsp;days of delivery of such Notice; provided that if (i)&nbsp;such
breach is not, by its nature, capable of being cured within such thirty (30)&nbsp;day
period, (ii)&nbsp;Operator is diligently and in good faith proceeding to attempt to cure
such breach, and (iii)&nbsp;an extension of time to cure such breach would not materially
increase the loss or injury suffered by the Owners or BSP II on account of such breach,
then Operator shall be allowed such additional time as reasonably may be required to
cure such breach which shall in no event exceed one hundred eighty (180)&nbsp;days;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Operator Bankruptcy which is not stayed, dismissed or terminated within sixty
(60)&nbsp;days after commencement, or Operator ceases to carry on its business; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(e)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>an uncured event of default occurs under any Project Documents (other than this
Agreement) for which a party thereto (other than an Owner or Operator) may terminate
such Project Documents and such event of default is wholly or
substantially attributable to any breach of this Agreement by Operator or otherwise
to the Willful Action of Operator.</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 38</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>9.02 Owners Events of Default. </B>The following shall constitute events of default on the part
of Owners (&#147;Owners Events of Default&#148;) under this Agreement:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Owners fail to pay, pursuant to the requirements of the Participation
Agreement, any Progress Payment, as such term is defined in the Participation
Agreement, into the Trust Account, or any amount that is due to Operator for (i)
Operator Incentives or (ii)&nbsp;Operating Expenses incurred by Operator;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Owners commit a material breach of their obligations under this Agreement
(other than in connection with a default described in Section&nbsp;9.02(a)) unless not later
than five (5)&nbsp;days after the delivery of a Notice from Operator of such breach, Owners
commence and thereafter diligently pursues the cure of such breach; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Any Owner Bankruptcy which is not stayed, dismissed or terminated within sixty
(60)&nbsp;days after commencement, or Owners cease to carry on the business of BSP II.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>9.03 Procedure and Remedies.</B>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Upon the occurrence and during the continuance of an Operator Event of Default,
Owners shall have the right, in their sole and absolute discretion, to do either or
both of (i)&nbsp;terminate this Agreement subject to delivery of a Notice to Operator of
such termination, and (ii)&nbsp;except as otherwise provided in this Agreement, pursue any
and all other remedies available at law, in equity or pursuant to this Agreement.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Upon the occurrence and during the continuance of an Owners Event of Default,
Operator shall have the right, in its sole and absolute discretion, to do either or
both of (i)&nbsp;terminate this Agreement subject to delivery of a Notice to Owners and the
Lenders of such termination not later than thirty (30)&nbsp;days prior to the effective date
of such termination, and (ii)&nbsp;except as other provided in this Agreement, pursue any
and all other remedies available at law, in equity or pursuant to this Agreement.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Notwithstanding any other provision of this Agreement to the contrary, (i)
Owners shall not terminate this Agreement following the occurrence of an Operator Event
of Default if, prior to Operator receiving the Notice of such termination, and
notwithstanding the expiration or unavailability of any cure period provided under this
Agreement, Operator shall have cured the Operator Event of Default and (ii)&nbsp;Operator
shall not terminate this Agreement following the occurrence of an Owners Event of
Default if, prior to Owners receiving the Notice of such termination, and
notwithstanding the expiration or unavailability of any cure period provided under this
Agreement, Owners shall have cured the Owners Event of Default.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>9.04 Operator Liability Limiting Events. </B>Notwithstanding anything else to the contrary in
this Agreement, Operator shall not be in breach of this Agreement and shall have no liability to
Owners to the extent that any occurrence, condition, or event that is the result of (each a
&#147;Liability Limiting Event&#148;):
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 39</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any act or omission that is committed or omitted, as the case may be, solely at
the direction of Owners, provided that Operator timely objected to such act or omission
and advised Owners of the probable consequences thereof;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>equipment or system failure or design deficiency, unless such failure or
deficiency was caused by the Willful Action of Operator;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>a Force Majeure Event;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Operator&#146;s suspension of the performance of all or any portion of the Services
in accordance with this Agreement; or</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(e)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>a material breach of this Agreement by Owners;</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">provided that, in each case, Operator continues to perform the Services in accordance with this
Agreement except for modification of the operational standards set forth in Section&nbsp;4.02 required
to reasonably account for the Liability Limiting Event.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>9.05 Remedies Cumulative. </B>Except as specifically limited by this Agreement and subject to
Article&nbsp;X, each and every right, power and remedy of a Party, whether specifically stated in this
Agreement, or otherwise existing, may be exercised concurrently or separately, from time to time,
and so often and in such order as may be deemed expedient by the exercising Party, and the exercise
or the beginning of the exercise of any such right, power or remedy shall not be deemed a waiver of
the right to exercise, at the same time or thereafter, any other right, power or remedy. No delay
or omission of a Party in the exercise of any right, power or remedy shall impair or operate as a
waiver thereof or of any other right, power or remedy then or thereafter existing.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>ARTICLE X</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>LIABILITY LIMITATIONS</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>10.01 No Consequential Damages. </B>Notwithstanding any other provision in this Agreement to the
contrary, no Party shall be liable hereunder to any other Party for any consequential or indirect
loss or damage, including loss of revenues, loss of profit, cost of capital, loss of goodwill, or
any other special, exemplary, collateral, punitive or incidental damages incurred by such other
Party, its Affiliates, or their respective Representatives. Each Party further agrees that the
waivers and disclaimers of liability, indemnities, releases from liability and limitations on
liability expressed in this Agreement shall (a)&nbsp;apply at all times, whether in contract, equity,
tort or otherwise, regardless of the fault, negligence (in whole or in part), strict liability,
breach of contract or breach of warranty of the Party indemnified, released or whose liabilities
are limited and (b)&nbsp;extend to the Affiliates of the other Party and their respective
Representatives.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>10.02 No Warranties or Guarantees. </B>EXCEPT AS EXPRESSLY PROVIDED IN THIS AGREEMENT, NO PARTY

MAKES ANY REPRESENTATIONS, WARRANTIES OR GUARANTEES TO THE OTHER PARTIES, EITHER EXPRESS OR
IMPLIED, WITH RESPECT TO THE SUBJECT MATTER OF THIS AGREEMENT, AND ALL PARTIES DISCLAIM AND WAIVE
ANY IMPLIED WARRANTIES OR WARRANTIES IMPOSED BY LAW, INCLUDING MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE.
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 40</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>10.03 Assertion of Claims. </B>No claims of any kind shall be asserted against any Party, or its
Affiliates, whether arising out of contract, tort (including negligence), strict liability, or any
other cause or form of action, unless it is filed in a court of competent jurisdiction within the
applicable statute of limitations period for such claim.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>ARTICLE XI</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>DISPUTE RESOLUTION</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>11.01 Resolution By Coordination Committee. </B>All Disputes arising under this Agreement shall
be addressed by the Coordination Committee (as such term is defined in the Participation
Agreement). A Party may request that a Dispute be brought before the Coordination Committee by
delivering a written request to the Coordination Committee. The Coordination Committee shall meet,
negotiate and attempt in good faith to resolve the Dispute quickly, informally and inexpensively.
In the event the Coordination Committee cannot resolve the Dispute within thirty (30)&nbsp;days after
commencement of negotiations, a Party may seek any and all available legal remedies to resolve the
Dispute, whether at law or in equity.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>11.02 Continued Performance. </B>Pending the outcome of a Dispute being resolved in accordance
with this Article&nbsp;XI, the Parties shall continue to perform their respective obligations under this
Agreement to the extent such obligations and the continued performance thereof are not the subject
of such Dispute.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>ARTICLE XII</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>REPRESENTATIONS &#038; WARRANTIES</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>12.01 Of Each Party. </B>Each Party represents and warrants to the other Parties that, as of the
date hereof:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>it is, as applicable, an agency, cooperative corporation, consumers power
district, municipal corporation, political subdivision, or corporation duly organized,
validly existing and in good standing under the laws of the state of its formation and
authorized to conduct business in South Dakota;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>it has the power and authority to enter into and perform this Agreement and is
not prohibited from entering into this Agreement or discharging and performing all
covenants and obligations on its part to be performed under and pursuant to this
Agreement;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>it has taken all action required by Applicable Law in order to approve, execute
and deliver this Agreement;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>the execution and delivery of this Agreement, the consummation of the
transactions contemplated herein and the fulfillment of and compliance by such Owner
with the provisions of this Agreement will not conflict with or constitute a breach of
or a default under or require any consent, license or approval that has not been
obtained pursuant to any of the terms, conditions or provisions of any law, rule or
regulation, any order, judgment, writ, injunction, decree, determination, award or
other instrument or legal requirement of any court or</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 41</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left"><B>&nbsp;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>other agency of government, the
documents of its formation or any contractual limitation, restriction or outstanding
trust indenture, deed of trust, mortgage, loan agreement, lease, other evidence of
indebtedness or any other agreement or instrument to which it is a party or by which it
or any of its property is bound and will not result in a breach of or a default under
any of the foregoing;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(e)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>it has taken all such action as may be necessary or advisable and proper to
authorize this Agreement, the execution and delivery hereof, and the consummation of
transactions contemplated hereby;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(f)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>there are no bankruptcy, insolvency, reorganization or receiverships pending or
being contemplated by it, or to its knowledge threatened against it;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(g)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>to its knowledge, there are no actions, proceedings, judgments, rulings or
orders issued by, or pending before any court or other governmental body that would
materially adversely affect its ability to perform its obligations under this
Agreement; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(h)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>this Agreement is a legal, valid and binding obligation of such Owner
enforceable in accordance with its terms, except as limited by Laws of general
applicability limiting the enforcement of creditors&#146; rights or by the exercise of
judicial discretion in accordance with general principles of equity.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>ARTICLE XIII</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>MISCELLANEOUS</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.01 Access.</B>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Owners shall grant to Operator full and complete access to BSP II.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Operator shall grant to Owners, Lenders, Governmental Authorities, visitors
accompanied by Owners, visitors authorized by Operator and other unaccompanied visitors
upon Notice from Owners, access to BSP II; provided that:</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>access by visitors other than Owners shall be (A)&nbsp;subject to
reasonable advance written Notice delivered to Operator; (B)&nbsp;terminated or
prohibited during Emergencies and (C)&nbsp;limited to normal business hours, except
for access by Owners, their authorized Representatives or Governmental
Authorities for response to Emergencies or for unannounced inspections or
audits, which may, in either case, occur at any time, without advance Notice
and, in the case of Governmental Authorities, in accordance with Applicable
Law;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Owners and such other visitors granted access to BSP II shall
comply in all material respects with Operator&#146;s safety and security procedures
and other reasonable requirements, and otherwise conduct themselves in a manner
that does not materially interfere with the performance of the Services in
accordance with this Agreement; and</TD>
</TR>


</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 42</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>all visitors granted access to BSP II shall at all times be
accompanied by an authorized Representative of Owners or Operator.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.02 Cooperation of the Parties. </B>Each Party shall cooperate in good faith with the other
Parties in its efforts to fulfill its obligations under this Agreement. To that end, (a)&nbsp;except as
expressly provided elsewhere in this Agreement, no Party shall unreasonably deny, condition, or
withhold or otherwise delay its approval or consent upon the reasonable request for such approval
or consent by the other Part(ies) and (b)&nbsp;each Party shall, upon Notice from the any Party, take
all actions and sign, execute and deliver all agreements, deeds, documents and other instruments,
and shall use its Reasonable Efforts to cause each of its Affiliates, its partners and their
respective Representatives to take all actions and sign, execute and deliver all agreements, deeds,
documents and other instruments reasonably required of it or them to carry out and give full effect
to this Agreement and the rights and obligations of the Parties hereunder.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.03 Force Majeure Event. </B>The performance of any obligation required hereunder shall be
excused during the continuation of any Force Majeure Event suffered by the Party whose performance
is hindered in respect thereof, and the time for performance of any obligation that has been
delayed due to the occurrence of a Force Majeure Event. The Party experiencing the delay or
hindrance shall use Reasonable Efforts to notify the other Parties in writing of the occurrence of
such Force Majeure Event and the anticipated period of delay within ten (10)&nbsp;days after the
commencement of the Force Majeure Event, provided that the failure of the Party experiencing the
delay or hindrance to notify the other Parties within such ten (10)&nbsp;day period shall not preclude
such Party from claiming a Force Majeure Event hereunder. Each Party suffering a Force Majeure
Event shall take, or cause to be taken, such action as may be necessary to overcome or otherwise to
mitigate, in all material respects, the effects of any Force Majeure Event suffered by any of them
and to resume performance hereunder as soon as practicable under the circumstances.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.04 Publicity Policy. </B>In recognition of the requirements and desire of the Parties to
disclose information regarding their ownership and involvement with BSP II and its activities, a
Party may:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>disclose information regarding BSP II as may be required by any Applicable Law;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>provide information regarding BSP II to its Affiliates, employees, agents,
consultants, advisors, contractors, accountants and counsel;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>publicize to any Third Party (including, but not limited to, through press
releases and other media) information about the general activities of BSP II and any
otherwise publicly available information; provide, however, Parties shall seek to avoid
publicizing to Third Parties:</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>financial information about BSP II, including the economics of
the Project, except as requested to obtain financing or to update rating
agencies or an Owner&#146;s lender;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>information regarding other Parties;</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 43</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>information a Party specifically identifies as commercially
sensitive (such as information about ongoing Project negotiations); and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iv)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>information respecting the positions of BSP II on federal or
state policy matters (unless consistent with the policy goals or a policy
initiative of BSP II as generally understood by the Parties).</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">If a Party desires to release information described in Sections&nbsp;13.04(c)(i)-(iv), then that Party
shall describe the intended release of information to the E&#038;O Committee and the E&#038;O Committee shall
respond promptly to the Party with any concerns about such release.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.05 Notices. </B>Notices required by this Agreement from a Party hereto shall be addressed to
the other Parties, at the addresses noted in <B>Exhibit&nbsp;A</B>, and may be updated from time to time by
Notice to all Parties. Any notice, request, consent, or other communication required or authorized
under this Agreement to be given by one Party to another Party shall be in writing. It shall
either be hand delivered or mailed, postage prepaid, to the Representative of said Party. If
mailed, the notice, request, consent or other communication shall be simultaneously sent by
facsimile or other electronic means. Any such notice, request, consent, or other communication
shall be deemed to have been received by the close of the Business Day on which it was hand
delivered or transmitted electronically (unless hand delivered or transmitted after the close of
business, in which case it shall be deemed received at the close of the next Business Day).
Real-time or routine communications concerning the operation of the Joint Facilities shall be
exempt from this Section&nbsp;13.05.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.06 Transfers and Assignments.</B>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Except as otherwise provided for in this Section&nbsp;13.06, this Agreement may not
be transferred or assigned by any Party without (i)&nbsp;the written consent of the other
Parties and (ii)&nbsp;the written agreement of the transferee or assignee whereby such
transferee or assignee expressly assumes and agrees to perform each and every
obligation of the transferor or assignor under this Agreement. Any transfer or
assignment in violation of this Section&nbsp;13.06 shall be null and void.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Subject to the delivery of a Notice to Operator at least thirty (30)&nbsp;days prior
to the effective date of such assignment, Owners may, without Operator&#146;s consent,
assign this Agreement to a Lender or Lenders as security under a financing of BSP II.
So long as any such assignment, or any consolidation, modification or extension of any
such assignment, shall remain outstanding, the following provisions shall apply:</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Operator shall, upon delivery to Owners of any Notice of an
Owners Event of Default, also deliver a copy of such Notice to each assignee.
No Notice of an Owners Event of Default shall be deemed to have been delivered
unless and until a copy thereof shall have also been delivered to each
assignee. From and after the date that such Notice has been delivered to an
assignee, such assignee shall have the same period for cure or commencing cure
of any alleged breach or default as is given to Owners in</TD>
</TR>


</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 44</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>accordance with this
Agreement. Operator shall accept such performance by or on behalf of such
assignee as if the same had been done by Owners.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The making of such assignment shall not be deemed to constitute
an assignment or transfer of this Agreement, nor shall any such assignee be
deemed to be an assignee or transferee of this Agreement so as to require such
assignee to assume the performance of any of Owners&#146; obligations under this
Agreement, but the purchaser at any sale of this Agreement in any proceedings
for the foreclosure of any assignment, or the assignee or transferee of this
Agreement under any instrument of assignment or transfer in lieu of the
foreclosure of any assignment, shall be deemed to be an assignee or transferee
and as such shall be deemed to have agreed to perform all of Owners&#146;
obligations under this Agreement from and after the date of such purchase and
assignment.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Notwithstanding any other provision of this Agreement, any
sale of this Agreement in any proceeding for the foreclosure of any assignment,
or the assignment or transfer of this Agreement in lieu of the foreclosure of
any assignment shall be deemed to be a permitted sale, transfer or assignment
of this Agreement, and this Agreement shall continue in full force and effect
following any such sale, transfer or assignment; provided that such transferee
demonstrates to Operator&#146;s reasonable satisfaction that it has the capability
to fulfill Owners&#146; obligations under this Agreement.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The Parties further agree that the Party whose consent to a transfer or
assignment has been requested shall:</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(i)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>respond in writing not later than thirty (30)&nbsp;days after
receiving the other Party&#146;s request;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(ii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>provide to the other Party, at its own cost and expense, any
documentation, including estoppel statements, reasonably requested by such
other Party;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iii)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>forego (1)&nbsp;any reimbursement for any cost or expense,
including attorney&#146;s fees, that such Party, its Affiliates or its partners
incurs directly or indirectly in connection with responding to, granting or
denying the other Party&#146;s request and (2)&nbsp;any financial consideration of any
kind whatsoever for itself, its Affiliates or its partners as a fee or other
compensation for responding to, granting or denying the other Party&#146;s request;
and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(iv)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>not unreasonably withhold its consent.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.07 Late Payments. </B>Any amounts due and payable in accordance with this Agreement by one
Party to the other Party and not paid in full on or before the date such payment is due shall
accrue interest at the Overdue Payment Rate from and excluding the date such payment is due
(including, without limitation, any payments received by Operator that it may be required to repay
Owners) to and including the day such unpaid and overdue amount plus accrued interest is paid.
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 45</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.08 Third-Party Beneficiaries. </B>Except as expressly provided herein, this Agreement is
intended to be solely for the benefit of Owners, Operator and their respective successors and
permitted assigns, and is not intended to and shall not confer any rights or benefits on any Person
not a signatory hereto.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.09 Title Passage.</B>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Title to all materials, equipment, supplies, consumables, spare parts and other
items purchased or obtained by Operator and paid for ultimately by Owners in accordance
with this Agreement shall pass immediately and automatically to and vest in Owners upon
the passage of title from the vendor or supplier thereof; provided that such transfer
of title shall in no way affect Operator&#146;s obligations as set forth in the other
provisions of this Agreement.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>All documents prepared or developed by Operator, its Affiliates or their
respective Representatives in connection with BSP II or the performance of the
Services, including all manuals, data, designs, drawings, plans, specifications,
records, reports and accounts, shall immediately and automatically become the property
of Owners when prepared or developed. All such documents, together with any materials
and documents furnished by Owners to Operator, its Affiliates or to their respective
Representatives in connection with BSP II or the performance of the Services, shall be
delivered to Owners upon the termination of this Agreement.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.10 Relationship of Parties. </B>Operator is retained by Owners as an independent contractor to
operate and maintain BSP II on behalf of Owners. Owners delegate to Operator the overall
responsibility for operating and maintaining BSP II in accordance with this Agreement. Nothing
contained in this Agreement shall be construed to create an association, trust, partnership or
joint venture between the Parties.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.11 Entire Agreement. </B>This Agreement consists of the terms and conditions set forth herein,
as well as the Appendices hereto, which are incorporated by reference herein and made a part
hereof. This Agreement contains the entire agreement between the Parties with respect to operation and maintenance of BSP II and
supersedes all prior negotiations, undertakings, agreements and business term sheets.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.12 Amendments. </B>No amendments or modifications of this Agreement shall be valid unless
evidenced in writing and signed by duly authorized Representatives of all of the Parties.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.13 Governing Law. </B>This Agreement, including its construction, interpretation and effect,
shall be governed by the laws of the State of South Dakota without regard to its conflict of laws
principles.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.14 Consent to Jurisdiction. </B>Each of the Parties hereto hereby irrevocably consents and
agrees that any legal action or proceedings with respect to this Agreement may be brought in any of
the courts of the United States of America for the District of South Dakota having subject matter
jurisdiction and, by execution and delivery of this Agreement and such other documents executed in
connection herewith, each Party hereby:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>accepts the non-exclusive jurisdiction of the aforesaid courts;</TD>
</TR>


</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 46</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>irrevocably agrees to be bound by any final judgment (after any and all
appeals) of any such court with respect to such documents;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>irrevocably waives, to the fullest extent permitted by law, any objection which
it may now or hereafter have to the laying of venue of any suit, action or proceedings
with respect to such documents brought in any such court, and further irrevocably
waives, to the fullest extent permitted by law, any claim that any such suit, action or
proceedings brought in any such court has been brought in any inconvenient forum;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>agrees that service of process in any such action may be effected by mailing a
copy thereof by registered or certified mail (or any substantially similar form of
mail), postage prepaid, to such Party at its address set forth below, or at such other
address of which the other Parties hereto shall have been notified; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(e)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>agrees that nothing herein shall affect the right to effect service of process
in any other manner permitted by law or limit the right to bring any suit, action or
proceeding in any other jurisdiction.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.15 Waiver Of Trial By Jury. </B>EACH OF THE PARTIES HERETO HEREBY KNOWINGLY, VOLUNTARILY AND
INTENTIONALLY WAIVES THE RIGHT ANY OF THEM MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION
BASED HEREON, OR ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS AGREEMENT AND ANY AGREEMENT
CONTEMPLATED TO BE EXECUTED IN CONJUNCTION HEREWITH, OR ANY COURSE OF CONDUCT, COURSE OF DEALING,
STATEMENTS (WHETHER VERBAL OR WRITTEN) OR ACTIONS OF ANY PARTY HERETO. THIS PROVISION IS A
MATERIAL INDUCEMENT FOR THE PARTIES ENTERING INTO THIS AGREEMENT.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.16 Severability. </B>The invalidity, in whole or in part, of any of the Sections or paragraphs
of this Agreement will not affect the validity of the remainder of such Sections or paragraphs.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.17 Waiver. </B>Failure by either Party to exercise any of its rights under this Agreement
shall not constitute a waiver of such rights. No Party shall be deemed to have waived any of its
rights under this Agreement unless it has made such waiver specifically in writing.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.18 Counterparts. </B>This Agreement may be executed in one or more counterparts, each of which
shall be deemed an original and all of which together shall be deemed one and the same Agreement,
and may be executed and delivered by facsimile signature, which shall be considered an original.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>13.19 Captions. </B>The Table of Contents and the titles or captions of Articles, Sections and
Appendices contained in this Agreement are inserted only as a matter of convenience and for
reference, and in no way define, limit, extend, describe or otherwise affect the scope or meaning
of this Agreement or the intent of any provision hereof.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>&#091;The next page is the signature page.&#093;</B>
</DIV>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 47</FONT></TD>
</TR>
<TR valign="bottom">

<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>IN WITNESS WHEREOF</B>, the Parties hereto have caused their names to be hereunto subscribed by
their officers, intending thereby that this Agreement shall be effective as of the Effective Date.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>OWNERS:</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="36%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="14%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="40%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">CENTRAL MINNESOTA MUNICIPAL POWER AGENCY</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">GREAT RIVER ENERGY</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ Paul I. Leland
<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">By
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ David Saggau<BR>
<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Paul Leland</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">David Saggau</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Its President</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">Its President and Chief Executive Officer</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">HEARTLAND CONSUMERS POWER DISTRICT</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">MONTANA-DAKOTA UTILITIES CO., a Division of MDU Resources Group, Inc.</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ Michael McDowell<BR>
<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">By
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ Bruce T. Imsdahl
<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Michael McDowell</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">Bruce T. Imsdahl</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Its General Manager</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">Its President and Chief Executive Officer</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">OTTER TAIL CORPORATION dba Otter</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">SOUTHERN MINNESOTA MUNICIPAL POWER</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Tail Power Company</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">AGENCY</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ Charles S. MacFarlane
<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">By
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ Raymond A. Hayward
<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Charles S. MacFarlane</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">Raymond A. Hayward</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Its President</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">Its Executive Director and CEO</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">WESTERN MINNESOTA MUNICIPAL POWER AGENCY</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ Donald E. Habicht
<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Donald E. Habicht</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Its President</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><B>OPERATOR:</B></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">OTTER TAIL CORPORATION dba Otter</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Tail Power Company</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ Charles S. MacFarlane
<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Charles S. MacFarlane</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Its President</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 48</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>EXHIBIT A</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">CENTRAL MINNESOTA MUNICIPAL POWER AGENCY<BR>
459 South Grove Street<BR>
Blue Earth, MN 56013<BR>
Attn: Donald E. Kom, Executive Director<BR>
Telephone: (507)&nbsp;526-2193<BR>
Facsimile: (507)&nbsp;526-2527<BR>
E-mail: donk@utplus.com
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">GREAT RIVER ENERGY<BR>
17845 East Highway 10<BR>
Elk River, MN 55330<BR>
Attn: David Saggau, President and Chief Executive Officer<BR>
Telephone: (763)&nbsp;241-2286<BR>
Facsimile: (763)&nbsp;241-2366<BR>
E-mail: dsaggau@grenergy.com
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">HEARTLAND CONSUMERS POWER DISTRICT<BR>
203 West Center Street<BR>
Madison, SD 57042<BR>
Attn: Michael McDowell, General Manager<BR>
Telephone: (605)&nbsp;256-6536<BR>
Facsimile: (605)&nbsp;256-2990<BR>
E-mail: mmcdow@hcpd.com
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">MISSOURI RIVER ENERGY SERVICES<BR>
3724 West Avera Drive<BR>
P.O. Box 88920<BR>
Sioux Falls, SD 57109-8920<BR>
Attn: Mr.&nbsp;Ray Wahle<BR>
Telephone: (605)&nbsp;338-4042<BR>
Facsimile: (605)&nbsp;978-9360<BR>
E-mail: rwahle@mrenergy.com
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">MONTANA-DAKOTA UTILITIES CO., a Division of MDU Resources, Inc.<BR>
400 North Fourth Street<BR>
Bismarck, ND 58501<BR>
Attn: Andrea L. Stomberg, Vice President &#150; Electric Supply<BR>
Telephone: (701)&nbsp;222-7752<BR>
Facsimile: (701)&nbsp;222-7606<BR>
E-mail: andrea.stomberg@mdu.com
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 49</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<TR><TD>&nbsp;</TD></TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">OTTER TAIL CORPORATION dba Otter Tail Power Company<BR>
215 South Cascade St.<BR>
P.O. Box 496<BR>
Fergus Falls, MN 56538-0496<BR>
Attn: Charles MacFarlane<BR>
Telephone: (218)&nbsp;739-8353<BR>
Facsimile: (218)&nbsp;739-8218<BR>
E-mail: cmacfarlane@otpoc.com<BR><BR>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">SOUTHERN MINNESOTA MUNICIPAL POWER AGENCY<BR>
500 First Avenue SW<BR>
Rochester, MN 55902-3303<BR>
Attention: Mr.&nbsp;Peter J. Reinarts, P.E.<BR>
Manager &#150; Generation, Operations and Marketing<BR>
Telephone: (507)&nbsp;292-6452<BR>
Facsimile: (507)&nbsp;292-6414<BR>
E-mail: pj.reinarts@smmpa.org<BR><BR></DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">and</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR><TD>&nbsp;</TD></TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">SOUTHERN MINNESOTA MUNICIPAL POWER AGENCY<BR>
500 First Avenue SW<BR>
Rochester, MN 55902-3303<BR>
Attention: Mr.&nbsp;David P. Geschwind, P.E.<BR>
Chief Operating Officer<BR>
Telephone: (507)&nbsp;292-6460<BR>
Facsimile: (507)&nbsp;292-6414<BR>
E-mail: dp.geschwind@smmpa.org<BR><BR></DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">WESTERN MINNESOTA MUNICIPAL POWER AGENCY<BR>
25 N.W. 2<SUP style="font-size: 85%; vertical-align: text-top">nd</SUP> Street, Suite&nbsp;102<BR>
Ortonville, MN 56278-1411<BR>
Attention: Mr.&nbsp;Don Habicht<BR>
Telephone: (320)&nbsp;839-2549<BR>
Facsimile: (320)&nbsp;839-2540<BR>
E-mail: david.fhmab@midconetwork.com<BR></DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 50</FONT></TD>
</TR>
<TR valign="bottom">
    <TD VALIGN="TOP"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>SCHEDULE 1.04</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>BIG STONE I AND BIG STONE II 2005 JOINT FACILITIES AGREEMENT</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Note:
This schedule is filed as a separate exhibit (Exhibit&nbsp;10.3) to Otter Tail Corporation&#146;s
Quarterly Report to the Securities and Exchange Commission on Form&nbsp;10-Q for the quarterly period
ended June&nbsp;30, 2005.</B>
</DIV>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 51</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>SCHEDULE 4.01</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>AGREEMENT OF REPRESENTATION &#150; BSP II</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This Agreement is made and entered into this 30<SUP style="font-size: 85%; vertical-align: text-top">th</SUP> day of June, 2005, by and among
Central Minnesota Municipal Power Agency, an agency incorporated under the laws of Minnesota, Great
River Energy, a cooperative corporation incorporated under the laws of Minnesota, Heartland
Consumers Power District, a consumers power district formed and organized under the South Dakota
Consumers Power District Law (Chapter&nbsp;49-35 of the South Dakota Codified Laws), Montana-Dakota
Utilities Co., a Division of MDU Resources Group, Inc., a corporation incorporated under the laws
of the State of Delaware, Otter Tail Corporation, a corporation incorporated under the laws of
Minnesota (&#147;Otter Tail&#148;), Southern Minnesota Municipal Power Agency, a municipal corporation and
political subdivision of the State of Minnesota, and Western Minnesota Municipal Power Agency, a
municipal corporation and political subdivision of the State of Minnesota) (each a &#147;BSP II Owner&#148;
and collectively, the &#147;BSP II Owners&#148;) and Otter Tail, in its capacity as operator of BSP II
(&#147;Operator&#148;).
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>RECITALS</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WHEREAS, the BSP II Owners entered into that certain Participation Agreement (&#147;BSP II
Participation Agreement&#148;) dated as of June&nbsp;30, 2005, which governs and controls the relationship
between the BSP II Owners in connection with their development, ownership and operation of the new,
approximately 600 MW coal-fired electric generating plant located in Big Stone City, South Dakota,
known as the Big Stone II Power Plant (&#147;BSP II&#148;);
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WHEREAS, BSP II is an Affected Unit at an Affected Source as those terms are defined in
Subchapter IV-A (entitled Acid Deposition Control) of the Clean Air Act, 42 U.S.C. &#167; 7401 et seq.,
as amended (the &#147;Act&#148;);
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WHEREAS, as a result of the Act it is necessary for the BSP II Owners and the Operator to
agree on a Designated Representative and an Alternate Designated Representative who will represent
the BSP II Owners and Operator in matters pertaining to the Acid Rain Program as such matters
affect BSP II;
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WHEREAS, effective June&nbsp;30, 2005, the BSP II Owners designated Otter Tail as the Operator of
BSP II;
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WHEREAS, in accordance with the appointment of Otter Tail to operate BSP II as agent for the
BSP II Owners as set forth in the BSP II Participation Agreement, the BSP II Owners herein set
forth their agreement upon which certain employees of Otter Tail will serve as agents for the BSP
II Owners and Operator as Designated Representative and Alternate Designated Representative under
the Act.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;NOW THEREFORE, in consideration of the mutual covenants contained herein the BSP II Owners and
Operator agree as follows:
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 52</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt">ARTICLE I. DEFINITIONS
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.1. &#147;Acid Rain Program&#148; means the sulfur dioxide and nitrogen oxides air pollution control
program established pursuant to Subchapter IV-A of the Act in 40 C.F.R. Parts 72-78, as amended.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.2. &#147;Administrator&#148; means the Administrator of the United States Environmental Protection
Agency or the Administrator&#146;s duly authorized representative.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.3. &#147;Affected Source&#148; means a source that includes one or more Affected Units. For the
purpose of this Agreement, Affected Source shall mean BSP II.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.4. &#147;Affected Unit&#148; means a unit that is subject to any emissions reduction requirements or
emissions limitation under the Acid Rain Program. For the purpose of this Agreement, Affected Unit
shall mean BSP II. BSP II is an Affected Unit at the Affected Source.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.5. &#147;Allowance&#148; means an authorization by the Administrator under the Acid Rain Program, to
emit up to one (1)&nbsp;ton of sulfur dioxide during or after a specified calendar year.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.6. &#147;Alternate Designated Representative&#148; means the natural person designated in the
certificate of representation submitted in accordance with 40 C.F.R. Part&nbsp;72 to act on behalf of
the Designated Representative with regard to all matters within the authority of that Designated
Representative under the Acid Rain Program.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.7. &#147;Designated Representative&#148; means the natural person designated in the certificate of
representation submitted in accordance with 40 C.F.R. Part&nbsp;72 to represent and legally bind each
BSP II Owner and Operator in all matters pertaining to the Acid Rain Program.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.8. &#147;Operator&#148; means Otter Tail Corporation dba Otter Tail Power Company, or such other
operator of BSP II as may be designated in the future in accordance with the BSP II Participation
Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.9. &#147;Permitting Authority&#148; means the Administrator, or the state or local air pollution
control agency having an approved permitting program under Subchapter V of the Act and associated
regulatory authority over BSP II.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.10. &#147;Unit Account&#148; means an allowance tracking system account established by the
Administrator for an Affected Unit.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.11. All other terms herein shall be interpreted consistent with the Act and the Acid Rain
Program.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">ARTICLE II. INTRODUCTION
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.1. The Designated Representative shall represent and legally bind the BSP II Owners and
Operator in all matters pertaining to BSP II as an Affected Unit and in all matters pertaining
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 53</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">to BSP II as an Affected Source. The Designated Representative shall represent the BSP II Owners
and Operator in matters pertaining to the Acid Rain Program including, but not limited to (a)&nbsp;BSP
II&#146;s submission of and compliance with acid rain permits, permit applications, and compliance plans
and (b)&nbsp;the holding, transfer, and disposition of Allowances for BSP II. It is the intention of
the BSP II Owners and Operator that this Agreement be interpreted consistent with the Act and the
Acid Rain Program.
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt">ARTICLE III. OWNERSHIP AND OPERATOR
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.1. The ownership interests in, and designation of the Operator of, BSP II are set forth in
the BSP II Participation Agreement. These ownership interests and designation of the Operator
shall only be subject to change in accordance with the terms of the BSP II Participation Agreement.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">ARTICLE IV. DESIGNATED REPRESENTATIVE
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.1. Whenever a requirement or prohibition of the Acid Rain Program applies to the Affected
Source, it shall be deemed to apply to the Designated Representative and each and every BSP II
Owner and Operator. Whenever a requirement or prohibition of the Acid Rain Program applies to the
Affected Unit, it shall be deemed to apply to the Designated Representative and each and every BSP
II Owner and Operator.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.2. The Designated Representative shall, as a matter of law, represent and legally bind each
BSP II Owner and Operator in all matters pertaining to the Acid Rain Program, including but not
limited to the holding, transfer and disposition of Allowances; the submission of and compliance
with permits, permit applications, permit revisions, permit renewals, compliance plans, and
compliance certifications in accordance with 40 C.F.R. Part&nbsp;72; and the compliance with excess
emissions requirements, payment of penalties, and submission of and compliance with offset plans in
accordance with 40 C.F.R. Part&nbsp;77.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.3. The Designated Representative is hereby given all necessary authority to carry out the
duties and responsibilities of the Designated Representative on behalf of each BSP II Owner and
Operator under the Acid Rain Program.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.4. The Designated Representative shall abide by the fiduciary responsibilities imposed in
this Agreement and by the Acid Rain Program. For all non-routine matters, the Designated
Representative shall act in consultation with the BSP II Engineering and Operating Committee.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.5. Vis-&#224;-vis any Permitting Authority, to the extent required under the Act each BSP II
Owner and Operator shall be fully bound by and liable for any actions, inactions or submissions by
the Designated Representative, and the BSP II Owners and Operator shall be bound by any order
issued to the Designated Representative by the Administrator, another Permitting Authority, or a
court regarding BSP II.
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 54</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt">ARTICLE V. SELECTING AND CHANGING THE DESIGNATED REPRESENTATIVE
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.1. As long as Otter Tail is the Operator, Otter Tail, as agent for the BSP II Owners, shall
have exclusive control over the selection and nomination of the Designated Representative,
including changes in the Designated Representative, subject only to approval by the BSP II
Engineering and Operating Committee as provided in the BSP II Participation Agreement, which
approval shall not be unreasonably withheld or delayed. The person designated in Attachment A
hereto as the BSP II Designated Representative is hereby approved.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.2. Should it become necessary to change or select a new Designated Representative, the
Designated Representative being replaced shall continue in all respects as the Designated
Representative until a superseding certificate of representation is filed with the Administrator
pursuant to 40 C.F.R. Part&nbsp;72.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">ARTICLE VI. ALTERNATE DESIGNATED REPRESENTATIVE
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.1. As long as Otter Tail is the Operator, Otter Tail, as agent for the BSP II Owners, shall
have exclusive control over the selection and nomination of the Alternate Designated
Representative, including changes in the Alternate Designated Representative, subject only to
approval by the BSP II Engineering and Operating Committee as provided in the BSP II Participation
Agreement, which approval shall not be unreasonably withheld or delayed. The person designated in
Attachment A hereto as the BSP II Alternate Designated Representative is hereby approved.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.2. Should it become necessary to change or select a new Alternate Designated Representative,
the Alternate Designated Representative being replaced shall continue in all respects as the
Alternate Designated Representative until a superseding certificate of representation is filed with
the Administrator pursuant to 40 C.F.R. Part&nbsp;72.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.3. The Alternate Designated Representative is hereby authorized to act on behalf of the
Designated Representative and the BSP II Owners and Operator in the event the Designated
Representative is absent or otherwise not available to perform the actions and duties specified in
40 C.F.R. Parts 72-78.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.4. Unless the context clearly dictates otherwise, whenever the term Designated
Representative is used in this Agreement, it shall be construed to include the Alternate Designated
Representative.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">ARTICLE VII. LIABILITY AND INDEMNIFICATION
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.1. Notwithstanding any other provision in this Agreement or the requirements of the BSP II
Participation Agreement, each BSP II Owner, as a matter of law, is liable for the Affected Unit&#146;s,
as well as the Affected Source&#146;s, compliance with the requirements and prohibitions of the Acid
Rain Program and for any violation of any such requirement or prohibition.
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 55</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.2. Neither the Designated Representative, the Alternate Designated Representative, nor the
Operator (or its directors, officers, or employees) shall be liable to the BSP II Owners for any
loss, damage, or costs (including incidental and consequential damages) incurred by the BSP II
Owners as the result of any action or failure to act, whether negligent or otherwise, by the
Designated Representative or the Alternate Designated Representative in carrying out the provisions
of this Agreement, except for (i)&nbsp;any &#147;Willful Action&#148; as that term is defined in the BSP II
Participation Agreement and (ii)&nbsp;as to any Operator who is a BSP II Owner, also except for any
liability accruing to the Operator as a BSP II Owner.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.3. The BSP II Owners shall each be liable for any action, representation or failure to act
by the Designated Representative with regard to BSP II. When authorized to act on behalf of the
Designated Representative, any action, representation, or failure to act by the Alternate
Designated Representative shall be deemed to be an action, representation or failure to act of the
Designated Representative.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7.4. The BSP II Owners agree to indemnify and hold harmless the Designated Representative and
the Alternate Designated Representative, when acting on behalf of the Designated Representative,
from any civil liabilities or penalties assessed against them personally as the result of any
action or failure to act, whether negligent or otherwise, except any &#147;Willful Action&#148; as that term
is defined in the BSP II Participation Agreement. Such indemnification shall be in direct
proportion to BSP II Plant ownership.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">ARTICLE VIII. ACCOUNT REPRESENTATIVE
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8.1. Pursuant to the rules pertaining to the Allowance tracking system established by the
Administrator, BSP II will be assigned a Unit Account. The Designated Representative and the
Alternate Designated Representative shall serve as the authorized account representative and the
alternate authorized account representative, respectively, for the Unit Account assigned to BSP II.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">ARTICLE IX. ACCOUNTING
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.1. The costs incurred (a)&nbsp;by the Operator, (b)&nbsp;by the Designated Representative, (c)&nbsp;on
behalf of the Operator, or (d)&nbsp;on behalf of the Designated Representative in compliance with
express or implied requirements of the Act shall be shared and paid for pursuant to the terms of
the BSP II Participation Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.2. Books of accounts and records concerning details of costs applicable to this Agreement,
as well as all records necessary to account for and track Allowances obtained, used or otherwise
disposed of in accordance with the Act, shall be kept by Operator in accordance with Operator&#146;s
established procedures and methods adopted for accounting for such items and shall be in conformity
with accepted accounting practices and the Federal Energy Regulatory Commission&#146;s uniform system of
accounts or the system of accounts of any other regulatory body having jurisdiction. These books
shall be open to examination at any reasonable time by any of the BSP II Owners. Operator shall
furnish each of the BSP II Owners summaries or reports
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 56</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">relative to Allowances obtained, used or otherwise disposed of and costs incurred applicable to
this Agreement as well as details of transactions pertaining to Allowances as are necessary for the
BSP II Owners to comply with all applicable regulatory requirements.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.3 Allowances obtained by or on behalf of each BSP II Owner pursuant to Article&nbsp;X of this
Agreement shall be designated to the individual BSP II Owner&#146;s subaccount within the Unit Account.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9.4. Prior to the 15th day of each month, the Designated Representative shall provide
Allowance-related information as it pertains to BSP II and each respective BSP II Owner&#146;s
subaccount for the previous calendar month. Said Allowance information shall include, but not be
limited to, the information set forth on Attachment B hereto. The Allowances used by each BSP II
Owner shall be determined based on actual emissions of sulfur dioxide, calculated on a pro rata
basis as provided in Section&nbsp;10.1 of this Agreement.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">ARTICLE X. ALLOWANCES; CONTINGENCY RESERVE
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10.1. Each BSP II Owner shall acquire and transfer to the BSP II Unit Account Allowances
sufficient to cover the estimated sulfur dioxide emissions associated with its capacity share of
BSP II in accordance with the BSP II Participation Agreement. At a minimum, each BSP II Owner
shall maintain a balance of Allowances which, on the first of each month, is sufficient to cover
the year-to-date actual emissions of sulfur dioxide attributed to such Owner, plus the estimated
emissions of sulfur dioxide associated with such Owner&#146;s capacity share for a period of thirty (30)
days. For any given period of time, the actual sulfur dioxide emissions attributed to a BSP II
Owner shall be equivalent to the product of (i)&nbsp;the total amount of energy dispatched from BSP II
to such Owner during the relevant time period, divided by the total amount of energy dispatched
from BSP II to all BSP II Owners during the same period, and (ii)&nbsp;the total amount of sulfur
dioxide actually emitted from BSP II for the relevant time period. Operator shall acquire
Allowances on behalf of any BSP II Owner who requests the same, which acquisition shall be at such
Owner&#146;s sole cost and expense and under such other terms as such Owner and Operator shall hereafter
agree.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10.2 In addition to the Allowances required under Section&nbsp;10.1 above, each BSP II Owner shall
maintain Allowances equal to or greater than its Allowance contingency reserve. The Allowance
contingency reserve for each BSP II Owner shall be the number of Allowances required to cover the
estimated sulfur dioxide emissions associated with eighty-five percent (85%) of such Owner&#146;s
capacity share of BSP II in accordance with the BSP II Participation Agreement for a period of
thirty (30)&nbsp;days. The Allowance contingency reserve for each BSP II Owner may be reduced only in
December, on a prorated basis consistent with the number of days remaining in that month. Operator
shall calculate the size of the Allowance contingency reserve for each BSP II Owner and shall
notify each BSP II Owner and the Designated Representative of that determination. Operator shall
not dispatch energy for any BSP II Owner who fails to maintain the balance of Allowances required
under Sections&nbsp;10.1 and 10.2.
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 57</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10.3 If, for any calendar year, a BSP II Owner has failed to maintain a balance of Allowances,
inclusive of its Allowance contingency reserve, sufficient to cover the actual sulfur dioxide
emissions attributed to such Owner for that calendar year (hereinafter an &#147;Exceedance&#148;), the
Designated Representative shall determine the amount of such Exceedance. If by February&nbsp;10th of
the following year, the Owner responsible for such Exceedance has not obtained and transferred to
the BSP II Unit Account additional Allowances sufficient to cover the Exceedance, the Designated
Representative shall proceed to purchase Allowances to meet the Acid Rain Program compliance
requirements in the most economical manner possible and bill the Owner for the cost of the
Allowances purchased to satisfy the Owner&#146;s Exceedance. Except for the foregoing, neither Operator
nor the Designated Representative shall purchase Allowances on the account of the Owners without
their prior consent. Allowances maintained by a BSP II Owner in excess of the Allowances required
of that Owner shall not be used to satisfy the Allowance requirements of any other BSP II Owner.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">ARTICLE XI. MISCELLANEOUS
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.1. During any period that a BSP II Owner is in default, in whole or in part, in performing
any of its obligations under this Agreement, such BSP II Owner shall be obligated and the default
shall be handled in the manner prescribed in the BSP II Participation Agreement. The defaulting
BSP II Owner shall not be entitled to energy from BSP II during the period of default, and the
non-defaulting BSP II Owners shall be entitled to all of the energy from BSP II. No such default
shall affect any BSP II Owner&#146;s ownership interest, or any BSP II Owner&#146;s obligations hereunder,
including its obligation to pay money or share expenses.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.2. Any waiver at any time by any BSP II Owner of its rights with respect to a default under
this Agreement, or with respect to any other matter arising in connection with this Agreement,
shall not be deemed a waiver with respect to any subsequent default or matter. Any delay, short of
the statutory period of limitation, in asserting or enforcing any right under this Agreement, shall
not be deemed a waiver of such right.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.3. This Agreement shall be effective on the date first written above and shall continue in
full force and effect as long as BSP II shall be used or useful for the generation of electric
power.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.4. This Agreement may be amended from time to time or canceled at any time by a written
document signed by all BSP II Owners and Operator. It is the intention of the BSP II Owners and
Operator that this Agreement be revised and amended as the BSP II Owners and Operator deem
necessary.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.5. This Agreement shall inure to the benefit of, and be binding on, the successors and
assigns of the BSP II Owners, subject to the restrictions on transferability set forth in the BSP
II Participation Agreement, and Operator, subject to the restrictions on transferability set forth
in the Operation and Maintenance Services Agreement by and among the BSP II Owners and Operator,
dated June&nbsp;30, 2005.
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 58</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.6. This Agreement shall be construed, interpreted, and controlled by the laws of the State
of South Dakota.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.7. Separate copies of this Agreement will be executed by the BSP II Owners and Operator
with the understanding that when each of the BSP II Owners and Operator has executed a copy, its
separately executed copy will be joined together with all similarly executed copies and conformed
master copies of said Agreement shall be prepared which shall bind all of the BSP II Owners and
Operator to the same extent and purpose as if all of the BSP II Owners and Operator had joined in
the execution of said master copies.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.8. Any article or provision of this Agreement declared or rendered unlawful by a court of
law or regulatory agency with jurisdiction over the BSP II Owners, Operator or the Designated
Representative, or deemed unlawful because of a statutory change will not otherwise affect the
lawful obligations that arise under this Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.9. In the event a dispute arises out of or relating to this Agreement or in connection with
the handling, disposition, accounting, or other treatment of Allowances, such dispute shall be
resolved in accordance with the dispute resolution procedures set forth in the BSP II Participation
Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;11.10. The BSP II Owners agree to be bound by all provisions of this Agreement. If there is a
conflict in the terms of the BSP II Participation Agreement and the terms of this Agreement
relating to the subject of this Agreement, the terms of this Agreement shall control, the BSP II
Participation Agreement shall be deemed amended hereby, and in all other respects the BSP II
Participation Agreement shall remain in full force and effect.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>&#091;The next page is the signature page.&#093;</B>
</DIV>



<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 59</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;IN WITNESS WHEREOF, each of the BSP II Owners and Operator has caused this Agreement to be
duly executed and attested as of date first written above.

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>OWNERS:</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="36%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="14%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="40%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="40%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="40%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="40%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">CENTRAL MINNESOTA MUNICIPAL POWER AGENCY</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">GREAT RIVER ENERGY</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;
<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">By
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top"><BR>
<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Paul Leland</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">David Saggau</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Its President</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">Its President and Chief Executive Officer</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">HEARTLAND CONSUMERS POWER DISTRICT</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">MONTANA-DAKOTA UTILITIES CO., a Division of MDU Resources Group, Inc.</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;<BR>
<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">By
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;
<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Michael McDowell</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">Bruce T. Imsdahl</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Its General Manager</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">Its President and Chief Executive Officer</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">OTTER TAIL CORPORATION dba Otter</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">SOUTHERN MINNESOTA MUNICIPAL POWER</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Tail Power Company</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="9" valign="top" align="left">AGENCY</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;
<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV>
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">By
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;
<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Charles S. MacFarlane</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">Raymond A. Hayward</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Its President</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">Its Executive Director and CEO</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">WESTERN MINNESOTA MUNICIPAL POWER AGENCY</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;
<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Donald E. Habicht</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Its President</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><B>OPERATOR:</B></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">OTTER TAIL CORPORATION dba Otter</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Tail Power Company</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;
<DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Charles S. MacFarlane</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left">Its President</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 60</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="right" style="font-size: 10pt; margin-top: 12pt">ATTACHMENT A
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt">APPOINTMENT OF
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt">DESIGNATED REPRESENTATIVE
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt">AND ALTERNATE DESIGNATED REPRESENTATIVE
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt">Affected Source: BSP II
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Designated Representative: Ward L. Uggerud
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Alternate Designated Representative: Terry M. Graumann
</DIV>



<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 61</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="right" style="font-size: 10pt; margin-top: 12pt">ATTACHMENT B
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt">ACCOUNTING FOR ALLOWANCES
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Designated Representative shall provide Allowance cost and transaction information for
each month to each BSP II Owner by the 15th calendar day of the ensuing month. The Allowance cost
and transaction information shall include the following items:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">1.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Allowance Account Balances</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">a.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Total Unit Account Balance</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">b.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>BSP II Owner&#146;s Sub Account Balance</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">c.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Total Future Year Unit Account Balance</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">d.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>BSP II Owner&#146;s Future Year Sub Account Balance</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">2.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Allowances Used (By Month and YTD)</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">a.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Total Unit Allowances Used</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">b.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>BSP II Owner&#146;s Allowances Used</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">c.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Serial Numbers of Allowances Designated for Compliance</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">3.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Allowance Transfers (By Month and YTD)</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">a.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Total Unit Account Transfers</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">b.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>BSP II Owner&#146;s Sub Account Transfers</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">c.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Total Future Year Unit Account Transfers</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">d.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>BSP II Owner&#146;s Future Year Sub Account Transfers</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">e.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Serial Numbers of BSP II Owner&#146;s Allowances Transferred</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="80%">&nbsp;</TD>
    <TD width="0%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Operation And Maintenance Services Agreement</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">Page 62</FONT></TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><FONT style="font-variant: SMALL-CAPS">Big Stone II Power Plant</FONT>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><FONT style="font-variant: SMALL-CAPS">June 30, 2005</FONT></TD>
</TR>
<TR valign="bottom">
    <TD colspan="3" valign="top" align="left"><DIV style="border-bottom: 1px solid #000000; font-size: 1px">&nbsp;</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>SCHEDULE 5.02(b)(i)</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>KEY PERFORMANCE INDICATORS</B>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>OSHA Rate</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Net Generation</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Non-Fuel O&#038;M per MWh</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>URGE/Employee</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>MWh/Employee</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Job Order Backlog</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Unplanned Overtime (outside of overhauls)</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Urge Rating</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Availability</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Equivalent Availability</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Forced Outage Rate</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Net Plant Heat Rate</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Station Service</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>SO<SUB>2 </SUB>Removal Percentage</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>SO<SUB>2</SUB> Credits Available/Purchased</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>NO<SUB>x </SUB>Removal Percentage</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>NO<SUB>x</SUB> Credits Available/Purchased</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Hg Removal Percentage</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Hg Credits Available/Purchased</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Bottom Ash Sold</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Fly Ash Sold</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Overtime Hours Worked</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Delivered Fuel Cost</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Energy Cost Less Fuel</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Reporting Deadlines</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Capital Budget Variance</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR>
<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Notices of Violation</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left">

<DIV style="font-size: 3pt; margin-top: 6pt; width: 18%; border-top: 1px solid #000000">&nbsp;
</DIV>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 0pt"><B>(*) Confidential information has been omitted and filed separately with the Commission pursuant to
Rule&nbsp;24b-2.</B>
</DIV>



<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

</BODY>
</HTML>
</TEXT>
</DOCUMENT>
