California's Proposed 750-MW Mountain Water Battery Enters Federal Review to Bolster Grid Stability
A proposed 750-megawatt pumped storage hydropower project, known as the Fish Creek Pumped Storage Project, near Nevada City, California, has entered federal review. The Federal Energy Regulatory Commission (FERC) has accepted the preliminary permit application for this 'mountain water battery,' which aims to store excess green energy. The project, proposed by RamaFlux Sierra PSH, LLC, will feature dual artificial reservoirs at different elevations: an upper pool at 4,200 feet and a lower pool at 2,600 feet. The system is designed to pump surplus midday solar power uphill to the upper reservoir and then release the stored water through penstocks to drive reversible pump-turbines as energy demand increases after sunset. A new 230-kilovolt transmission line will then transmit the clean electricity to the regional grid. The public has until November 30, 2026, to submit comments, competing applications, or motions to intervene.