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Pyramid Lake has a surface area of 1,380 acres (560 ha) and a storage capacity of 180,000 acre-feet (220,000,000 m 3) 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.
Pyramid and Castaic lakes act as the upper and lower reservoirs for the Castaic Power Plant, a 1,495 megawatt pumped storage hydroelectric plant located at Castaic Lake. [3] The plant generates electricity from the water that flows down from Pyramid Lake to Castaic Lake, and can store energy by pumping water in the reverse direction when desired.
Castaic Lake is bisected by the Elderberry Forebay Dam, which creates the adjacent Elderberry Forebay. The aqueduct water comes from Pyramid Lake through the Angeles Tunnel and is used to power Castaic Power Plant, a pumped-storage hydroelectric facility on the northern end of the forebay. Water is mostly powering the turbines, rather than ...
During on-peak energy-demand hours, water flows downhill through the tunnel, starting at an elevation of 2,572 feet (784 m) in Pyramid Lake, and then falling over 1,000 feet (300 m) to the turbines of the Castaic Power Plant at 1,519 feet (463 m). [6] [8] [9] The water is then stored in the Elderberry Forebay, adjacent to Castaic Lake.
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From Pyramid Lake, water is released through the Angeles Tunnel to the Castaic Power Plant on Elderberry Forebay and the 325,000 acre⋅ft (0.401 km 3) Castaic Lake reservoir located north of Santa Clarita. Castaic Power Plant is a pumped-storage hydroelectric plant capable of producing 1,247 MW on peak demand.
The 1,495 MW (Nominal) Castaic Pumped-Storage Plant is located at the upper end of the west arm of Castaic Lake. The Elderberry Forebay Dam separates the upper arm from the rest of Castaic Lake, maintaining a small pool for power generation known as the Elderberry Forebay, serving as the lower reservoir of the pumped-storage operation.
A component of the California State Water Project, the reservoir was partitioned from Castaic Lake in 1974 to store water for pumped-storage hydroelectricity generation. [ 2 ] [ 3 ] During on-peak energy-demand hours, water flows 7.5 miles (12.1 km) from Pyramid Lake through the Angeles Tunnel and then on to the turbines of the Castaic Power ...