Edwards Sanborn E1B
Terra-Gen, LLCKern County
Edwards Sanborn E1B is a hybrid solar and battery storage facility with 290.4 MW of EIA-reported total operating capacity and 136 MWh of reported storage energy capacity in Kern County, California, registered as EIA Plant ID 65674. Terra-Gen Operating Co-Hybrid is the registered plant entity or operator. Edwards Sanborn E1B is a phase of the broader Edwards Sanborn solar-plus-storage development, which has been described as one of the largest solar-and-storage facilities in the world and as a major contributor to the CAISO grid. The broader development was also described as the largest public-private collaboration in U.S. Department of Defense history; these distinctions apply to the combined development rather than to E1B alone.
Mapped infrastructure geometry associated with this asset.
Batteries, Solar Photovoltaic
1-hour storage duration
Edwards Sanborn E1B is operating.
230 kV · Southern California Edison Company (SCE)
EIA plant 65674 · Inventory for Sep 2026.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| BESS | Batteries | Operating | 136 | 136 |
| PV | Solar Photovoltaic | Operating | 154.4 | Unknown |
Similar plants ranked by technology, capacity, and distance.
Current generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| BESS | 136 MW 136 MW summer | Batteries BA | Nov 2023 | Operating |
| PV | 154.4 MW 154.4 MW summer | Solar Photovoltaic PV | Nov 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.
The Edwards Sanborn large generator interconnection agreement covered Edwards Solar 1B, Southern California Edison, and CAISO; the execution records show November 10, 2020 signatures.
CAISO
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 E1BCurrent | 290.4 MW | CA | |
| Edwards Sanborn E2 | 257.8 MW | CA | |
| Edwards Sanborn E4 | 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 portfolioSite construction for the Edwards & Sanborn solar-plus-storage project commenced in the first quarter of 2021.
Terra-Gen completed $959 million of senior secured financing for the second phase, including construction debt, a tax-equity bridge, and a construction/revolving letter-of-credit facility.
EIA-860 lists generator PV with this operating date.
Mortenson reports that the Edwards & Sanborn project reached substantial completion in 2023.
EIA-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.
Edwards Sanborn E1B reports 136 MW battery storage + 154.4 MW solar of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Sep 2026.
Edwards Sanborn E1B is a Batteries, Solar Photovoltaic facility in Kern County, CA, participating in the CAISO market.
Edwards Sanborn E1B is in Kern County, CA, inside the CAISO balancing area.
Edwards Sanborn E1B 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 E1B reported 348.9 GWh over the twelve months to 2026-07. Figures are net generation as filed to EIA-923.
Edwards Sanborn E1B interconnects at Winhub, on the Southern California Edison Company (SCE) system.
By capacity, Edwards Sanborn E1B ranks #271 of 7,597 operating plants of the same technology nationally. It ranks #45 of 972 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.
