Sanborn BESS 4
Sanborn BESS 4 is a 47 MW battery storage project in Kern County, California, operated by Terra-Gen Operating Co-BESS. EIA-860M lists 1 generating unit here, inside CAISO. Its unit entered service in 2023.
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
- 47 MW
- 47 MW net summer
- Generating units
- 1
- In service
- 2023
- EIA plant ID
- 65673
Where it is
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- County
- Kern County, California
- Coordinates
- 34.9581, -118.1078
- Balancing authority
- CISO
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- Terra-Gen Operating Co-BESS
- Primary energy source
- Battery
- Technologies
- Batteries
- Status
- Operating
Sanborn BESS 4: FAQ
- Where is Sanborn BESS 4?
- In Kern 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 Sanborn BESS 4?
- 47 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns Sanborn BESS 4?
- EIA-860M names Terra-Gen Operating Co-BESS 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 Sanborn BESS 4 LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Terra-Gen Operating Co-BESS 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 "Sanborn BESS 4 LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Sanborn BESS 4 still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.