Gridley Main
Butte County, California · EIA plant ID 58370 · Operator: Altus Power America Management, LLC
Nameplate1MWSummer 1 MW
Generators1in service
Net generation1GWh12 mo to Dec 2025
Capacity factor16%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 | 2.1 | 28.9% | — |
| 2014 | 1.9 | 21.9% | — |
| 2015 | 2.2 | 24.7% | — |
| 2016 | 1.8 | 20.4% | — |
| 2017 | 2 | 23.0% | — |
| 2018 | 2 | 22.3% | — |
| 2019 | 1.5 | 16.8% | — |
| 2020 | 1.3 | 14.5% | — |
| 2021 | 1.8 | 20.8% | — |
| 2022 | 1.8 | 20.6% | — |
| 2023 | 1.6 | 18.1% | — |
| 2024 | 1.6 | 18.7% | — |
| 2025 | 1.4 | 16.4% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| GEN1 | Solar Photovoltaic | PV | 1 | 1 | Mar 2013 | Operating | — | coming soon |
Owner / operator
Operator: Altus Power America Management, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Altus Power America Management, LLC | 100.0% | 1 MW |
Nearby plants
Within 80 km.
| Gridley Main Two | 3 MW | 0.2 km |
| 2127 Harris Solar Project | 1 MW | 9.2 km |
| Thermalito | 115 MW | 16.4 km |
| Oroville Cogeneration LP | 8 MW | 16.8 km |
| Thermalito Diverson Dam | 3 MW | 20.9 km |
| Tierra Buena Energy Storage | 5 MW | 22.5 km |