The Acorn Battery Energy Storage Projects is a 6,500kW energy storage project located in Thousand Oaks, Ventura County, California, US. The rated storage capacity of the project is 26,500kWh.

The electro-chemical battery energy storage project uses lithium-ion as its storage technology. The project was announced in 2018 and will be commissioned in 2021.


The Acorn Battery Energy Storage Projects is being developed by esVolta. The project is owned by Southern California Edison (100%), a subsidiary of Edison International.

The key applications of the project are demand response and grid support services.

Contractors involved

Southern California Edison is the owner. esVolta is the developer.

esVolta is the system integrator.

Additional information

The projects will also provide an array of energy and ancillary services to California’s electric grid, facilitating California’s transition to a cleaner and more resilient electric system. Acorn Battery Energy Storage Projects involves three projects with total combined storage capacity of 6.5 MW / 26.5 MWh.

About esVolta

esVolta (esVolta) is a developer, owner and operator of utility-scale energy storage projects that develops a large pipeline of future storage projects. esVolta is headquartered in Aliso Viejo, California, the US.


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.