GreenGenStorage Files for Giant Water Battery in California
Published Date: 4/4/2025
Notice
Summary
GreenGenStorage, LLC just filed a plan to build a big pumped storage hydroelectric project near Jackson, California, using two reservoirs to store and generate power. This affects local communities and the environment, with a clear schedule set for licensing and final changes. The project could impact energy costs and water use, with important deadlines coming soon for public input and final tweaks.
Analyzed Economic Effects
4 provisions identified: 1 benefits, 1 costs, 2 mixed.
Uses 85.7 acres of federal land
The proposed Mokelumne Pumped Storage Project would occupy 85.7 acres of Federal land administered by the U.S. Forest Service near Jackson in Amador and Calaveras Counties, California. The project filing identifies that federal land area and the project location.
Project size: 400 MW pumped storage plan
The application describes a pumped storage project with two reservoirs and a planned total generating capacity of 400 megawatts, plus tunnels, shafts, and an interconnection to the existing Salt Springs substation. The filing says the project would use PG&E reservoirs licensed under Mokelumne River Project No. 137.
Licensing schedule and amendment deadline
FERC set a preliminary hydro licensing schedule with key milestones in April 2025 and July 2025. If the Commission issues a Notice of Ready for Environmental Analysis, final amendments to the application must be filed no later than 30 days from that notice.
Public help for participation
FERC's Office of Public Participation (OPP) offers support to help members of the public — including landowners, community organizations, and Tribal members — access information and make filings like comments or interventions. OPP contact information is provided for assistance.
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