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400-MWh Big Rock energy storage project now online for CAISO

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September 4, 2025
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400-MWh Big Rock energy storage project now online for CAISO
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LS Energy Solutions has commenced commercial operations at the Big Rock energy storage site in Imperial County, California. The 200-MW/400-MWh project, developed and operated in partnership with Gore Street Energy Storage Fund (GSF), is now providing resource adequacy (RA) and ancillary services for the California Independent System Operator (CAISO) electrical grid.

200-MW/400-MWh Big Rock energy storage site in California. Credit: LS Energy Solutions

“We are thrilled to see the Big Rock site in full commercial operation and providing storage services for CAISO,” said Curt Feldman, Vice President at LS Energy Solutions. “As California’s grid faces challenges from data center growth, wildfires, and the need to meet carbon reduction goals, utility-scale storage like Big Rock is more critical than ever. Gore Street Energy Storage Fund has been an excellent partner for this project, and we look forward to working with them on future CAISO projects.”

The Big Rock site includes 137 LS-ES AiON-ESS containers storing energy for two-hour durations. LS-ES and GSF currently operate the site at 100 MW of deliverability to supply 400 MWh to CAISO and meet the four-hour discharge stipulation of a 12-year RA contract. In addition to supplying AiON-ESS containers, LS-ES is also supporting the site with operational services that include preventative and capacity maintenance, an extended warranty and system remote monitoring for the life of the project.

GSF acquired the Big Rock site in February 2023 from clean energy developer Avantus, and it marks the developer’s first project for CAISO.

News item from LS Energy

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