Atwell Island
Tulare County, California · EIA plant ID 58366 · Operator: SPS Atwell Island LLC
Nameplate20MWSummer 17 MW
Generators1in service
Net generation34GWh12 mo to Dec 2025
Capacity factor22%solar units, summer MW
Heat rate—thermal plants only
First online2013
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) |
|---|---|---|---|
| 2013 | 42.2 | 28.4% | — |
| 2014 | 42 | 23.8% | — |
| 2015 | 41.3 | 23.4% | — |
| 2016 | 41.3 | 23.3% | — |
| 2017 | 38.1 | 21.5% | — |
| 2018 | 39.8 | 22.5% | — |
| 2019 | 37.6 | 21.2% | — |
| 2020 | 32.8 | 18.5% | — |
| 2021 | 35.5 | 20.1% | — |
| 2022 | 37.6 | 21.2% | — |
| 2023 | 33.4 | 18.9% | — |
| 2024 | 33.3 | 24.1% | — |
| 2025 | 33.9 | 22.3% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Solar Photovoltaic | PV | 20.2 | 17.4 | Mar 2013 | Operating | — | coming soon |
Owner / operator
Operator: SPS Atwell Island LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Atwell Solar Trust 2012 | 100.0% | 20 MW |
Nearby plants
Within 80 km.
| White River Solar | 20 MW | 5.1 km |
| Alpaugh BESS | 10 MW | 5.8 km |
| Angela Solar Project | 80 MW | 5.9 km |
| Alpaugh North | 20 MW | 6.2 km |
| Alpaugh 50 | 50 MW | 6.8 km |
| Atwell Island West Solar | 20 MW | 10 km |