Bottle Rock PowerOut of service
Lake County, California · EIA plant ID 902 · Operator: Mayacma Geothermal
Nameplate55MWSummer 9 MW
Generators1in service
Net generation—GWh12 mo
Capacity factor—no 923 generation in the last 12 months
Heat rate—thermal plants only
First online1985
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), primary-fuel 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) |
|---|---|---|---|
| 2007 | 55.4 | 37.2% | — |
| 2008 | 98.6 | 66.0% | — |
| 2009 | 88.2 | 59.3% | — |
| 2010 | 67.6 | 45.4% | — |
| 2011 | 88.1 | 59.2% | — |
| 2012 | 71.9 | 81.9% | — |
| 2013 | 72.9 | 83.2% | — |
| 2014 | 69.1 | 78.8% | — |
| 2015 | 17.3 | 19.7% | — |
| 2016 | 0 | 0.0% | — |
| 2017 | 0 | 0.0% | — |
| 2018 | 0 | 0.0% | — |
| 2019 | 0 | 0.0% | — |
| 2020 | 0 | 0.0% | — |
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 | Geothermal | ST | 55 | 9 | Feb 1985 | Operating (Out of service) | — | coming soon |
Owner / operator
Operator: Mayacma Geothermal. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Mayacma Geothermal | 100.0% | 55 MW |
Nearby plants
Within 80 km.
| Sonoma California Geothermal | 78 MW | 5.1 km |
| Calistoga Power Plant | 176 MW | 5.6 km |
| West Ford Flat | 25 MW | 6.5 km |
| Geysers Unit 5-20 | 1,236 MW | 6.7 km |
| Aidlin Geothermal Power Plant | 25 MW | 9.8 km |
| Geothermal 1 | 110 MW | 10.1 km |