exhibit 10. 4 gas sales and portfolio administration agreement appendices index buyer's primary delivery points a buyer ’ s maximum quantities b “ reserved for future use ” c supplier reservation costs d commodity purchases - gas cost incentive mechanism e notices f invoice / payment data g demand cost charges h “ reserved ” i portfolio services j - k sigeco - appendix a 1 2 gas sales and portfolio administration agreement revised page no. 1 april 1, 2012 appendix a - buyer ’ s primary delivery points texas gas transmission corporation : meter no. meter station name 1808 sigeco south shipper deduct ( includes all of the following ) elberfeld boonville road long road levee ( evansville ) haubstadt snake run francisco wagner 1809 sigeco north shipper deduct ( includes all of the following ) bicknell edwardsport freelandville monroe city oaktown petersburg washington road rural – sigeco rural – hoosier gas 9540 dogtown midwestern gas transmission : meter no. meter station name 7071 - chrisney 7071 - 02 - 7100 ohio valley hub 3 sigeco - appendix a gas sales and portfolio administration agreement revised page no. 2 april 1, 2012 anr gas pipeline : meter no. meter station name 032410100 south chrisney ( sigeco ) texas eastern gas transmission : meter no. meter station name 79730 sigeco - ldc allocation point 70539 ft. branch, in 72648 southern indiana posey co., in ohio valley hub, llc : meter no. meter station name monroe city storage field 9401 texas gas - ohio valley hub interconnect amendment seller and buyer agree that this appendix a may be amended as provided in this agreement, which amendment ultimately will be memorialized in a revised appendix a. proliance energy, llc. southern indiana gas and electric company by : _ / s / david c. pentzien _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ by : / s / jerrold l. ulrey david c. pentzien jerrold l. ulrey its : vice president of sales & marketing its : vice president, regulatory affairs and fuels 4 sigeco - appendix b gas sales and portfolio administration agreement revised page no. 1 april 1, 2012 appendix b - buyer ’ s maximum quantities month daily april 73, 233 may 62, 327 june 62, 327 july 62