California has passed 5GW of grid-scale battery storage energy storage (BESS) projects, grid operator CAISO has revealed.

A seven-year observation of a vanadium flow battery in California from Sumitomo Electric has been completed, while US lab PNNL has found an alternative, food-based electrolyte which it said boosted capacity and longevity.

California utility SDG&E has commissioned two projects totalling 171MW of battery storage, while system integrator Ameresco has secured contracts to deliver 379MWh for at four gas plants in the state.

Hydrostor “remains fully committed” to its 4GWh advanced compressed air energy storage (A-CAES) project in California, its president told Energy-Storage.news as it considers alternative locations and delivery dates.

Swedish wind power pioneer Eolus has made a final investment decision (FID) on a battery storage project in California, its third in the US, with a targeted commercial operation in 2024.

Leeward Renewable Energy has signed 15-year PPA with utility Southern California Edison for a 126MW battery storage project in Kern County.

Leyline Renewable Capital has provided loans to developers RAI Energy and Grid Connected Infrastructure (GCI) for solar and storage projects.

Greenbacker Capital Management has acquired a 30MW/120MWh battery energy storage system (BESS) in California.

Zinc-bromine flow battery manufacturer Redflow’s CEO Tim Harris speaks with Energy-Storage.news about the company’s biggest-ever project.

RWE has brought its biggest utility-scale BESS project in the US closer to the start of commercial operations.