Momentum building for Hydrostor’s Willow Rock Energy Storage Center as company reaches key permitting and interconnection milestones



KERN COUNTY, CALIFORNIA, March 04, 2024 (GLOBE NEWSWIRE) — Hydrostor, a global long duration energy storage (LDES) developer and operator, has filed a Supplemental Application for Certification (SAFC) for their Willow Rock Energy Storage Center project in California, demonstrating that momentum is building for the project that will provide 500 MWs or eight hours of energy storage to California.

Coupled with the news that the project’s large generator interconnection agreement (LGIA) was fully executed with Southern California Edison (SCE) and the California Independent System Operator (CAISO) in December, this announcement marks a significant step forward for Willow Rock, currently one of California’s largest long-duration energy storage projects.

“We’re excited to be delivering these key milestones in California, including filing our Supplemental Application for Certification, which allows us to continue on pace to meet California’s late-decade needs for long duration energy storage,” said Jon Norman, President of Hydrostor.

“This project will provide much-needed storage capacity for the California market, which is becoming even more important as additional renewable generation is added to the grid. We welcome the work to come with the California Energy Commission to keep this project moving, and …

Full story available on


Leave a Reply

Your email address will not be published. Required fields are marked *