Sanborn BESS 3 is a battery energy storage facility with 169 MW of EIA-reported operating capacity and 676 MWh of reported energy capacity in Kern County, California, registered as EIA Plant ID 65672. Terra-Gen Operating Co-BESS owns and operates the plant. The facility interconnects at Windhub Substation at 220 kV. Its grid role is battery storage supporting cleaner, more reliable and resilient power delivery to the CAISO grid.
Reported plant capacity and configuration.
Primary generation technology.
Terra-Gen Operating Co-BESS · Kern County · CAISO
Battery subsystem rating.
Sanborn BESS 3 is operating.
220 kV · Southern California Edison Company
Batteries
4-hour storage duration
Sanborn BESS 3 is operating.
220 kV · Southern California Edison Company
CAISO
Similar plants ranked by technology, capacity, and distance.
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| BESS | 169 MW 169 MW summer | Batteries Electricity used for energy storage · BA | Oct 2023 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
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Project milestones and public references behind the asset profile.
Terra-Gen states that construction of the Edwards Sanborn Phase 1A/1B project began in 2020. A separate Sanborn BESS 3 construction-start date was not identified.
CAISO · Kern County
EIA-923 reports gross generation and net grid exchange for storage plants. Gross generation is shown as a discharge proxy; it is not a cycle count or conventional capacity factor.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| Sanborn BESS 3Current | 169 MW | CA | |
| Sanborn BESS 2 | 100 MW | CA | |
| Sanborn BESS 1 | 100 MW | CA | |
| Sanborn BESS 4 | 47 MW | CA |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioEIA-860 lists generator BESS with this operating date.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Sanborn BESS 3 has a reported capacity of 169 MW and an energy capacity of 676 MWh. Source: EIA Form 860.
Sanborn BESS 3 is a batteries facility in Kern County, CA, participating in the CAISO market.
Sanborn BESS 3 is in Kern County, CA, inside the CAISO balancing area.
Sanborn BESS 3 is operated by Terra-Gen Operating Co-BESS according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Sanborn BESS 3 reported 221.7 GWh over the twelve months to 2026-06. For a storage plant this is reported gross generation — a discharge proxy, not a cycle count or a conventional capacity factor.
Sanborn BESS 3 interconnects at Windhub Substation, on the Southern California Edison Company system.
By capacity, Sanborn BESS 3 ranks #79 of 962 operating plants of the same technology nationally. It ranks #18 of 248 in CA.
Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.
