A bill to authorize the Secretary of the Interior to construct, operate, and maintain hydroelectric powerplants at various existing water projects, and for other purposes.

Authorizes the Secretary of the Interior to construct, operate, and maintain the following hydroelectric powerplants: (1) the Palisades powerplant enlargement in Idaho and Wyoming; (2) the Anderson Ranch powerplant in Idaho; and (3) the Minidoka powerplant rehabilitation and enlargement in Idaho and Wyoming. Authorizes the Secretary of Energy to construct, operate, and maintain transmission facilities for such powerplants and to purchase replacement capacity and energy in order to maintain deliveries to customers during unit outages caused by such powerplant construction.

Directs the Secretary of the Interior and the Secretary of Energy to minimize the loss of capacity and energy to power customers due to unit outages resulting from such powerplant construction. Directs the Secretary of Energy to maintain deliveries of capacity and energy at contract prices to customers affected by such unit outages.

Requires that the hydroelectric power generated by such facilities be marketed through the Federal Columbia River Power System.

Authorizes appropriations beginning in FY 1984 to the Secretary of the Interior for construction, operation, and maintenance of the powerplants authorized under this Act and the cost of replacement capacity and energy. Authorizes appropriations beginning in FY 1984 to the Secretary of Energy for transmission facilities and the purchase of replacement capacity and energy.