; and (B) is constructed pursuant to a cooperative agreement entered into by the Secretary under section 4(b). (3) Rate The Administrator shall establish the cost of the power described in paragraph (1) at the firm power rate. (4) Additional power (A) In general If power, in addition to that made available to the Dry-Redwater Regional Water Authority System under paragraph (1), is necessary to meet the pumping requirements of the Dry-Redwater Regional Water Authority, the Administrator may purchase the necessary additional power at the best available rate. (B) Reimbursement The cost of purchasing additional power shall be reimbursed to the Administrator by the Dry-Redwater Regional Water Authority. (5) Responsibility for power charges The Dry-Redwater Regional Water Authority shall be responsible for the payment of the power charge described in paragraph (4) and non-Federal delivery costs described in paragraph (6). (6) Transmission arrangements (A) In general The Dry-Redwater Regional Water Authority System shall be responsible for all non-Federal transmission and distribution system delivery and service arrangements. (B) Upgrades The Dry-Redwater Regional Water Authority System shall be responsible for funding any transmission upgrades, if required, to the integrated system necessary to deliver power to the Dry-Redwater Regional Water Authority System. 6. Water rights Nothing in this Act— (1) preempts or affects any State water law