Aidlin Geothermal Power Plant
Sonoma County, California · EIA plant ID 52158 · Operator: Geysers Power Co LLC
Nameplate25MWSummer 18 MW
Generators2in service
Net generation82GWh12 mo to Dec 2025
Capacity factor52%geothermal units, summer MW
Heat rate—thermal plants only
First online1989
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), geothermal 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) |
|---|---|---|---|
| 2001 | 141.7 | 80.9% | — |
| 2002 | 137.1 | 78.3% | — |
| 2003 | 130.9 | 74.7% | — |
| 2004 | 122.9 | 70.0% | — |
| 2005 | 107.4 | 61.3% | — |
| 2006 | 136.5 | 77.9% | — |
| 2007 | 146.2 | 83.5% | — |
| 2008 | 137 | 78.0% | — |
| 2009 | 144.1 | 82.3% | — |
| 2010 | 149 | 85.0% | — |
| 2011 | 132.2 | 75.4% | — |
| 2012 | 119.5 | 68.0% | — |
| 2013 | 112.1 | 64.0% | — |
| 2014 | 139.7 | 88.6% | — |
| 2015 | 132.1 | 83.8% | — |
| 2016 | 125.3 | 79.2% | — |
| 2017 | 115.6 | 73.3% | — |
| 2018 | 114.2 | 72.4% | — |
| 2019 | 106.2 | 67.3% | — |
| 2020 | 105.1 | 66.5% | — |
| 2021 | 99.3 | 63.0% | — |
| 2022 | 84.9 | 53.8% | — |
| 2023 | 77.3 | 49.0% | — |
| 2024 | 81.3 | 51.4% | — |
| 2025 | 82.4 | 52.2% | — |
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 | Geothermal | ST | 12.5 | 9 | May 1989 | Operating | — | coming soon |
| GEN2 | Geothermal | ST | 12.5 | 9 | May 1989 | Operating | — | coming soon |
Owner / operator
Operator: Geysers Power Co LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Geysers Power Co LLC | 100.0% | 25 MW |
Nearby plants
Within 80 km.
| Bottle Rock Power | 55 MW | 9.8 km |
| ASTI | 1 MW | 11.5 km |
| Sonoma California Geothermal | 78 MW | 11.9 km |
| Calistoga Power Plant | 176 MW | 13 km |
| Geysers Unit 5-20 | 1,236 MW | 13.4 km |
| Cloverdale Solar I | 2 MW | 13.6 km |