Willow Spring Solar, LLC
Kern County, California · EIA plant ID 60324 · Operator: Willow Spring Solar LLC
Nameplate108MWSummer 108 MW
Generators1in service
Net generation230GWh12 mo to Aug 2026
Capacity factor24%solar units, summer MW
Heat rate—thermal plants only
First online2019
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) |
|---|---|---|---|
| 2019 | 288.1 | 30.5% | — |
| 2020 | 253.3 | 26.7% | — |
| 2021 | 265 | 28.0% | — |
| 2022 | 246 | 26.0% | — |
| 2023 | 237.5 | 25.1% | — |
| 2024 | 236.9 | 25.0% | — |
| 2025 | 251.4 | 26.6% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| GEN01 | Solar Photovoltaic | PV | 107.9 | 107.9 | Jan 2019 | Operating | — | coming soon |
Owner / operator
Operator: Willow Spring Solar LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Willow Spring Solar LLC | 100.0% | 108 MW |
Nearby plants
Within 80 km.
| Tumbleweed Energy Storage | 125 MW | 0.9 km |
| Rabbitbrush Solar, LLC | 120 MW | 1.4 km |
| Catalina Solar 2, LLC | 18 MW | 2.3 km |
| Estrella Solar & Storage | 84 MW | 2.7 km |
| Solar Star 2 | 279 MW | 2.9 km |
| Rosamond South 1 | 257 MW | 4.3 km |