Castaic Power Plant
| Castaic Power Plant | |
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Front of Castaic Power Plant
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 Location of Castaic Power Plant in California
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| Country | United States |
| Location | Los Angeles County, California |
| Coordinates | 34°35′14.32″N 118°39′23.88″W / 34.5873111°N 118.6566333°WCoordinates: 34°35′14.32″N 118°39′23.88″W / 34.5873111°N 118.6566333°W |
| Pumped-storage power station | |
| Upper reservoir | Pyramid Lake |
| Upper res. capacity | 186,000 acre·ft (229,427,622 m3) |
| Lower reservoir | Elderberry Forebay |
| Lower res. capacity | 28,400 acre·ft (35,030,884 m3) |
| Hydraulic head | 1,060 ft (323 m) |
| Generating units | 7 |
| Pump-generators | 6 |
| Power generation | |
| Nameplate capacity | 1507 MW (nominal) 1247 MW (rated) |
Castaic Power Plant (also called Castaic Pumped-Storage Plant) is a seven unit pumped-storage hydroelectric plant, operated by the Los Angeles Department of Water and Power, which provides peak load power from the falling water on the West Branch of the California State Aqueduct. It is a cooperative venture between the LADWP and the Department of Water Resources of the State of California. An agreement between the two organizations was signed on September 2, 1966, for construction of the project.
The Castaic Power Plant is located about 22 miles (35 km) from the northern Los Angeles city limits at the upper end of the West arm of Castaic Lake.
California State Aqueduct water en route to Southern California is pumped up through the Tehachapi Mountains (by the Edmonston Pumping Plant) to the Tehachapi Afterbay. There the aqueduct divides into East and West Branches. The West Branch water is again pumped at the Oso Pumping Plant to Quail Lake, near Highway 138 East of Gorman. From here it flows through a permanent pipeline waterway to Warne Power Plant, which is located at the inlet to Pyramid Lake. The Warne Plant was constructed by the state of California in 1983. Pyramid Lake has a surface area of 1,380 acres (560 ha) and a storage capacity of 180,000 acre feet (220,000,000 m3) with a maximum water surface elevation of 2,578 feet (786 m) above sea level. Pyramid Lake is the upper forebay for the Castaic Power Plant.
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