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.
Mapped infrastructure geometry associated with this asset.
Solar Photovoltaic, Batteries
4-hour storage duration
Rosamond South 1 is operating.
CAISO
CAISO · Kern County
EIA plant 67764 · Inventory for Sep 2026.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| RBESS | Batteries | Operating | 117 | 472 |
| RS1 | Solar Photovoltaic | Operating | 140 | Unknown |
Similar plants ranked by technology, capacity, and distance.
Current generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| RBESS | 117 MW 117 MW summer | Batteries BA | Aug 2025 | Operating |
| RS1 | 140 MW 140 MW summer | Solar Photovoltaic PV | Aug 2025 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
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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Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
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.
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 reports 117 MW battery storage + 140 MW solar of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Sep 2026.
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 415 GWh over the twelve months to 2026-07. Figures are net generation as filed to EIA-923.
By capacity, Rosamond South 1 ranks #365 of 7,597 operating plants of the same technology nationally. It ranks #59 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.
