Calistoga Power Plant
Lake County, California · EIA plant ID 50066 · Operator: Geysers Power Co LLC
Nameplate176MWSummer 100 MW
Generators2in service
Net generation451GWh12 mo to Aug 2026
Capacity factor51%geothermal units, summer MW
Heat rate—thermal plants only
First online1984
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), 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 | 529.8 | 55.0% | — |
| 2002 | 589.5 | 61.2% | — |
| 2003 | 590.3 | 61.3% | — |
| 2004 | 594.6 | 61.5% | — |
| 2005 | 555.1 | 57.6% | — |
| 2006 | 581.3 | 60.3% | — |
| 2007 | 581.9 | 60.4% | — |
| 2008 | 555.1 | 57.5% | — |
| 2009 | 493.3 | 51.2% | — |
| 2010 | 538.8 | 55.9% | — |
| 2011 | 522.3 | 54.2% | — |
| 2012 | 536.4 | 55.5% | — |
| 2013 | 470.9 | 48.9% | — |
| 2014 | 490.1 | 55.9% | — |
| 2015 | 470 | 53.6% | — |
| 2016 | 557.6 | 63.5% | — |
| 2017 | 468.7 | 53.5% | — |
| 2018 | 500.8 | 57.2% | — |
| 2019 | 400.5 | 45.7% | — |
| 2020 | 468.9 | 53.4% | — |
| 2021 | 432.9 | 49.4% | — |
| 2022 | 535.8 | 61.2% | — |
| 2023 | 472.9 | 54.0% | — |
| 2024 | 468.8 | 53.4% | — |
| 2025 | 454.7 | 51.9% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| UNT1 | Geothermal | ST | 88.2 | 50 | Mar 1984 | Operating | — | coming soon |
| UNT2 | Geothermal | ST | 88.2 | 50 | Mar 1984 | 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% | 176 MW |
Nearby plants
Within 80 km.
| Sonoma California Geothermal | 78 MW | 1.1 km |
| Geysers Unit 5-20 | 1,236 MW | 1.2 km |
| West Ford Flat | 25 MW | 1.9 km |
| Geothermal 1 | 110 MW | 4.5 km |
| Geothermal 2 | 110 MW | 5.1 km |
| Bear Canyon | 13 MW | 5.2 km |