Big Rock Solar Farm
Big Rock Solar Farm is a 200 MW battery storage project in Imperial County, California, operated by Big Rock ESS Assets, LLC. 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
- 200 MW
- 200 MW net summer
- Generating units
- 1
- In service
- 2025
- EIA plant ID
- 64636
Where it is
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- County
- Imperial County, California
- Coordinates
- 32.7334, -115.7137
- Balancing authority
- CISO
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- Big Rock ESS Assets, LLC
- Primary energy source
- Battery
- Technologies
- Batteries
- Status
- Operating
Big Rock Solar Farm: FAQ
- Where is Big Rock Solar Farm?
- In Imperial 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 Big Rock Solar Farm?
- 200 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns Big Rock Solar Farm?
- EIA-860M names Big Rock ESS Assets, LLC as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is this the same as Big Rock Solar Farm LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Big Rock ESS Assets, LLC here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Big Rock Solar Farm LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Big Rock Solar Farm still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.