Edwards Sanborn E4 is a hybrid solar and battery storage facility with 248.9 MW of EIA-reported operating capacity in Kern County, California, registered as EIA Plant ID 65675. Terra-Gen Operating Co-Hybrid is the registered plant entity or operator. Mortenson built the facility using Power Electronics HEM FS3430M equipment; public project records list 1 battery units. Commercial operation began in 2024.
EIA-reported operating capacity; nameplate, seasonal, AC/DC, and unit ratings may differ.
Primary generation technology.
Terra-Gen Operating Co-Hybrid · Kern County · CAISO
Edwards Sanborn E4 is operating.
Installed equipment documented in public project records.
Best-supported operating milestone.
Batteries, Solar Photovoltaic
Edwards Sanborn E4 is operating.
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 | 100 MW 100 MW summer | Batteries Electricity used for energy storage · BA | Nov 2023 | Operating |
| PV | 148.9 MW 148.9 MW summer | Solar Photovoltaic Solar · PV | Dec 2022 | 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.
EIA-860 lists generator PV with this operating date.
CAISO · Kern County
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| Edwards Sanborn E1A | 293.3 MW | CA | |
| Edwards Sanborn E1B | 290.4 MW | CA | |
| Edwards Sanborn E2 | 257.8 MW | CA | |
| Edwards Sanborn E4Current | 248.9 MW | CA | |
| Edwards Sanborn 1C | 148 MW | CA | |
| Edwards Sanborn E5 | 115 MW | CA | |
| Edwards Sanborn S1 | 84.6 MW | CA | |
| Edwards Sanborn S3 | 70.7 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.
Terra-Gen states that the broader Edwards Sanborn 1B facility was commissioned in phases and reached full commercial operations in 2024; this is a phase-level milestone rather than a separate E4 commissioning date.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Edwards Sanborn E4 has a reported capacity of 248.9 MW. Source: EIA Form 860.
Edwards Sanborn E4 is a Batteries, Solar Photovoltaic facility in Kern County, CA, participating in the CAISO market.
Edwards Sanborn E4 is in Kern County, CA, inside the CAISO balancing area.
Edwards Sanborn E4 is operated by Terra-Gen Operating Co-Hybrid according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Edwards Sanborn E4 reports a commercial operation date of 2024. Current status: operating. Source: EIA Form 860.
Edwards Sanborn E4 reported 334.6 GWh over the twelve months to 2026-06. Figures are net generation as filed to EIA-923.
By capacity, Edwards Sanborn E4 ranks #324 of 7,234 operating plants of the same technology nationally. It ranks #55 of 939 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.
