Rosamond South 1
Kern County, California · EIA plant ID 67764 · Operator: Golden Fields Solar IV, LLC
Nameplate257MWSummer 257 MW
Generators2in service
Net generation416GWh12 mo to Aug 2026
Capacity factor36%solar units, summer MW
Heat rate—thermal plants only
First online2025
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), solar units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2025 | 157.4 | 32.0% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| RBESS | Batteries | BA | 117 | 117 | Aug 2025 | Operating | — | coming soon |
| RS1 | Solar Photovoltaic | PV | 140 | 140 | Aug 2025 | Operating | — | coming soon |
Owner / operator
Operator: Golden Fields Solar IV, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Golden Fields Solar IV, LLC | 100.0% | 257 MW |
Nearby plants
Within 80 km.
| Golden Fields Solar I, LLC | 54 MW | 0.9 km |
| Solar Star California, XLI, LLC | 54 MW | 0.9 km |
| Golden Field Solar III, LLC | 339 MW | 1.6 km |
| North Rosamond Solar LLC | 151 MW | 2.2 km |
| Solar Star 2 | 279 MW | 2.4 km |
| Solar Star 1 | 318 MW | 3.6 km |