REV Renewables and LS Power commission California's first 8-hour duration lithium-ion BESS

June 23, 2026

Announced 18 June and celebrated with a ribbon-cutting ceremony alongside local officials, community leaders, and industry partners, the project is the first eight-hour battery energy storage system (BESS) in California. Image: Mortenson

REV Renewables and its parent company, US energy sector developer and investor company LS Power, have commissioned the Tumbleweed Energy Storage facility in Kern County, California, US.

Announced 18 June and celebrated with a ribbon-cutting ceremony alongside local officials, community leaders, and industry partners, the project is the first 8-hour duration battery energy storage system (BESS) in California.

Tumbleweed was developed in partnership with California community choice aggregators (CCAs) Ava Community Energy and California Community Power (CC Power), on behalf of CCAs CleanPowerSF, Peninsula Clean Energy, Redwood Coast Energy Authority, San José Clean Energy, Silicon Valley Clean Energy, Sonoma Clean Power, and Valley Clean Energy.