The powerplant is operated and maintained by the state of California under an operation and maintenance agreement with Reclamation. The pumping-generating plant name has been changed by California to William R. Gianelli.
This joint Federal-State facility, located at San Luis Dam, lifts water by pump turbines from the O`Neill forebay into the San Luis Reservoir. During the irrigation season, water is released from San Luis Reservoir back through the pump-turbines to the forebay and energy is reclaimed. Each of the eight pumping-generating units has a capacity of 63,000 horsepower as a motor and 53,000 kilowatts as a generator. As a pumping station to fill San Luis Reservoir, each unit lifts 1,375 cubic feet per second at 290 feet total head. As a generating plant, each unit passes 1,640 cubic feet per second at the same head.
Western Electricity Coordinating Council, California-Southern Nevada Power Area
PMA Service Area
Western Area Power Administration, Sierra Nevada Region
Original Nameplate Capacity
Year of Initial Operation
San Luis Creek
Organization: State of California Phone: 209-826-1277
More Information about the U.S. Bureau of Reclamation