Geothermal 1
Other power plant · Sonoma County, California
Nameplate capacity
110 MW
Rank in California
#252
of 1,897 plants
In service since
1983
January 1983
Details
- Primary fuel
- Other
- Technology
- Geothermal
- Operator
- Northern California Power Agny
- County
- Sonoma County
- Generating units
- 2
- Share of state capacity
- 0.10%
- Rank among other plants in California
- #5 of 152
- EIA plant code
- 7368
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Geothermal | 55 MW | 30 MW | 1983 | Operating |
| 2 | Geothermal | 55 MW | 30 MW | 1983 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in California
| Big Creek 2A | Hydro | 110 MW |
| Catalina Solar LLC | Solar | 110 MW |
| Geothermal 2 | Other | 110 MW |
| Pit 7 | Hydro | 110 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 110 MW solar plant and a 110 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All California power plants · What California actually generates