Upcoming Projects

AZUSA PUMPED-STORAGE PROJECT

The Azusa Pumped Storage Project would be in the north of the city of Azusa, in the Los Angeles County. The project concept envisions the construction of a pumped storage power plant facility utilizing the existing Azusa hydroelectric plant facilities. The plant would provide energy storage up to 1,800 MW-h. Electricity generation would be possible at 100 MW for 18 h or 150 MW for 12 h. The plant would have pumping capacity for 200 MW of renewables. Furthermore, it would operate in a closed loop without altering existing streams.

The San Gabriel reservoir will serve as upper reservoir. The water level variation at the San Gabriel reservoir will be less than 6.5 ft. The San Gabriel Canyon Spreading Grounds in the city of Azusa will serve as lower reservoir. These spreading grounds are estimated to hold a maximum of 8,000 acre-ft of water. The existing Azusa hydroelectric forebay, bypass spillway and 3MW power plant will be decommissioned.
The existing San Gabriel pipeline (3.2 ft diameter – 5.8mi long) will need to be replaced with a 16 ft pipeline. The water will be released from the powerhouse to a 16 ft underground tailrace tunnel that will reach the San Gabriel Canyon Spreading Grounds Basin 1. The two Spreading Basins could be connected with a new 400 ft long interconnecting pipeline if water storage requires it.

The existing Azusa power plant would be converted into an underground powerhouse for pumped storage operation. The new plant will be rated at 200 MW with four 50 MW motor/generator pump/turbine sets. Power transmission for delivering/storing energy would be possible by interconnecting to SCE’s transmission system through a new 3-mile 220 kV transmission line.

Additionally, alternative project capacities can be considered depending on the pipeline diameter that will be used. The table below details the potential project capacities.
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Project Maps

SANTA FE PUMPED STORAGE PROJECT

The proposed Santa Fe Pumped Storage Project would be located northwest of Irwindale city, in the Los Angeles county, California. The project concept envisions the construction of a pumped storage power facility with capacity for electricity generation at 200 MW for 36 hours and pumping capacity at 280 MW. The plant would provide energy storage for up to 7,200 MW-h of renewable energy. It would operate in a closed loop; therefore, it would not alter existing streams.

The project proposes the existing San Gabriel reservoir as upper reservoir and will be replace the existing San Gabriel pipeline (3.2 ft diameter – 5.8 mi long) with a 16 ft pipeline. The pipeline will be extended 4 miles through the San Gabriel River Trail, up to the proposed Santa Fe reservoir intake/outlet structure.

The project proposes an underground powerhouse, which would be constructed in the existing Santa Fe Dam Recreation area and will be located at least 60 ft underground. The new pumped storage plant will be rated at 280 MW with four 70 MW motor/generator – pump/turbine sets. The project will include a new 1.5-mile 220 kV overhead transmission line to interconnect the project to SCE transmission system.

The existing San Gabriel pipeline could be leveraged for a lower project capacity. Other pipeline diameters can also be considered. The table below presents alternative project capacities depending in the pipeline diameter that can be used.

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Project Maps

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