Rosamond South 1 is a hybrid solar and battery storage facility with 257 MW of EIA-reported total operating capacity and 468 MWh of reported storage energy capacity in Kern County, California, registered as EIA Plant ID 67764. Golden Fields Solar IV, LLC owns and operates the plant, a subsidiary of Clearway Energy Group, LLC. Commercial operation began on November 5, 2025.
Reported plant capacity and configuration.
Primary generation technology.
Golden Fields Solar IV, LLC · Kern County · CAISO
Battery subsystem rating.
Rosamond South 1 is operating.
Best-supported operating milestone.
Solar Photovoltaic, Batteries
4-hour storage duration
Rosamond South 1 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 |
|---|---|---|---|---|
| RBESS | 117 MW 117 MW summer | Batteries Electricity used for energy storage · BA | Aug 2025 | Operating |
| RS1 | 140 MW 140 MW summer | Solar Photovoltaic Solar · PV | Aug 2025 | 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.
Clearway Energy Group announced $550 million of construction financing and the start of construction on the Rosamond South I solar-and-storage project.
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.
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
EIA-860 lists generator RBESS, generator RS1 with this operating date.
Clearway announced that Rosamond South 1 had reached commercial operations as a 140 MW solar and 117 MW energy-storage complex.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Rosamond South 1 has a reported capacity of 257 MW and an energy capacity of 468 MWh. Source: EIA Form 860.
Rosamond South 1 is a Solar Photovoltaic, Batteries facility in Kern County, CA, participating in the CAISO market.
Rosamond South 1 is in Kern County, CA, inside the CAISO balancing area.
Rosamond South 1 is operated by Golden Fields Solar IV, LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Rosamond South 1 reported 370.3 GWh over the twelve months to 2026-06. Figures are net generation as filed to EIA-923.
By capacity, Rosamond South 1 ranks #336 of 7,234 operating plants of the same technology nationally. It ranks #59 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.
