Sierra Energy Storage, LLC
Sierra Energy Storage, LLC is a 10 MW battery storage project in Tuolumne County, California, operated by Engie North America. EIA-860M lists 1 generating unit here, inside CAISO. Its unit entered service in 2025.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Nameplate capacity
- 10 MW
- 10 MW net summer
- Generating units
- 1
- In service
- 2025
- EIA plant ID
- 61803
Where it is
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- County
- Tuolumne County, California
- Coordinates
- 37.8744, -120.4774
- Balancing authority
- CISO
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- Engie North America
- Primary energy source
- Battery
- Technologies
- Batteries
- Status
- Operating
Sierra Energy Storage, LLC: FAQ
- Where is Sierra Energy Storage, LLC?
- In Tuolumne County, California (CA). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
- How big is Sierra Energy Storage, LLC?
- 10 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns Sierra Energy Storage, LLC?
- EIA-860M names Engie North America as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is Sierra Energy Storage, LLC still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.