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

energy-storage.news Jun 24, 2026

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

Curated by Shubham · TechCapsules · Jun 24, 2026

AI-summarised brief · reviewed before publication

REV Renewables and LS Power have commissioned California's first 8-hour duration lithium-ion battery energy storage system (BESS) in Kern County. The Tumbleweed Energy Storage facility was developed in partnership with California community choice aggregators (CCAs) and was brought online ahead of the California Public Utilities Commission's (CPUC) requirements. The system's capacity was not disclosed, but it is part of a larger project with a final expansion totaling 125MW/1,000MWh. The project satisfies 55% of the Mid-Term Reliability requirement for eight-hour minimum storage procurement.

💡 Why It Matters

· The Tumbleweed project's success highlights the growing demand for long-duration energy storage (LDES) in California, driven by the state's ambitious renewable energy goals.
· As the global average storage duration expands to meet net zero scenarios, emerging LDES technologies will face significant challenges in achieving cost reductions comparable to lithium-ion's dramatic declines over the past decade.

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