The PG&E-Calstor Battery Energy Storage System is a 10,000kW energy storage project located in California, US.

The electro-chemical battery energy storage project uses lithium-ion as its storage technology. The project was announced in 2017 and will be commissioned in 2021.


The PG&E-Calstor Battery Energy Storage System is being developed by Calstor. The project is owned by Pacific Gas and Electric (100%), a subsidiary of PG&E.

The key applications of the project are renewable energy integration and grid optimization.

Contractors involved

Pacific Gas and Electric is the owner. Calstor is the developer.

Additional information

The project is a part of EDF Renewable’s Capacity Storage Agreement (CSA) with California utility Pacific Gas and Electric (PG&E). Under the agreement, Calstor, LLC, a subsidiary of EDF Renewable Energy will build the Calstor stand-alone lithium-ion energy storage project, which will be located in California.


All publicly-announced energy storage projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects are sourced through secondary information sources such as country specific power players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.