Geothermal Power Plants in California

Every operating geothermal power plant in California on EIA-860M for 2026-07: 32 plants, 76 generating units and 3 GW of nameplate capacity across 5 counties.

As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m

Plants
32
76 generating units
Nameplate capacity
3 GW
Counties
5
Grid operator
Mixed
no single ISO covers a majority

Map of geothermal power plants in California

Every one of the 32 plants is drawn at the coordinate EIA files for it.

Loading map…
  • Geothermal · 32

List of geothermal power plants in California

Sort by any column. Capacity is nameplate, summed across every generating unit EIA lists at the site.

geothermal power plants in California
Geysers Unit 5-20GeothermalGeysers Power Co LLCSonoma1,236121971Operating
Calistoga Power PlantGeothermalGeysers Power Co LLCLake176.421984Operating
Geothermal 1GeothermalNorthern California Power AgnySonoma11021983Operating
Geothermal 2GeothermalNorthern California Power AgnySonoma11021985Out of service and NOT expected to return to service in next calendar year
Coso Finance PartnersGeothermalCoso Operating Co LLCInyo92.231987Operating
Heber GeothermalGeothermalORCAL Geothermal, IncImperial91.552006Operating
Coso Power DevelopersGeothermalCoso Operating Co LLCInyo9031989Operating
Coso Energy DevelopersGeothermalCoso Operating Co LLCInyo9031988Operating
North Brawley Geothermal PlantGeothermalOrmat Nevada IncImperial8052009Out of service and NOT expected to return to service in next calendar year
Sonoma California GeothermalGeothermalGeysers Power Co LLCLake7811983Operating
Second Imperial GeothermalGeothermalORCAL Geothermal, IncImperial74.542006Operating
Salton Sea Power LLC - Unit 5GeothermalCalEnergy Operating CorporationImperial58.312000Operating
Bottle Rock PowerGeothermalMayacma GeothermalLake5511985Out of service and NOT expected to return to service in next calendar year
John L. Featherstone PlantGeothermalHudson Ranch Power I LLCImperial5512012Operating
Salton Sea Power Gen Co - Unit 3GeothermalCalEnergy Operating CorporationImperial53.911989Operating
Salton Sea Power Gen Co - Unit 4GeothermalCalEnergy Operating CorporationImperial47.511996Operating
Ormesa IIIGeothermalOrmat Nevada IncImperial45.631989Operating
CE LeathersGeothermalCalEnergy Operating CorporationImperial45.511989Operating
Del Ranch CompanyGeothermalCalEnergy Operating CorporationImperial45.511988Operating
Elmore CompanyGeothermalCalEnergy Operating CorporationImperial45.511988Operating
CD4GeothermalCD4Mono44.412022Operating
Vulcan-BN Geothermal Power CompanyGeothermalCalEnergy Operating CorporationImperial39.621985Operating
Aidlin Geothermal Power PlantGeothermalGeysers Power Co LLCSonoma2521989Operating
Ormesa IIGeothermalOrmat Nevada IncImperial2421989Operating
Geo East Mesa IIGeothermalOrmat Nevada IncImperial21.611989Out of service and NOT expected to return to service in next calendar year
Salton Sea Power Gen Co - Unit 2GeothermalCalEnergy Operating CorporationImperial2031990Operating
Ormesa IGeothermalOrmat Nevada IncImperial1922003Operating
Mammoth G3GeothermalOrmat Nevada IncMono1531990Operating
Mammoth G2GeothermalOrmat Nevada IncMono1531990Operating
CE Turbo LLCGeothermalCalEnergy Operating CorporationImperial11.512000Operating
Mammoth G1GeothermalOrmat Nevada IncMono1021984Operating
Salton Sea Power Gen Co - Unit 1GeothermalCalEnergy Operating CorporationImperial1011982Operating

Largest geothermal power plants in California

  1. 1Geysers Unit 5-20Sonoma County, California1,236 MW
  2. 2Calistoga Power PlantLake County, California176.4 MW
  3. 3Geothermal 1Sonoma County, California110 MW
  4. 4Geothermal 2Sonoma County, California110 MW
  5. 5Coso Finance PartnersInyo County, California92.2 MW
  6. 6Heber GeothermalImperial County, California91.5 MW
  7. 7Coso Power DevelopersInyo County, California90 MW
  8. 8Coso Energy DevelopersInyo County, California90 MW
  9. 9North Brawley Geothermal PlantImperial County, California80 MW
  10. 10Sonoma California GeothermalLake County, California78 MW

Geothermal power plants by county in California

The county EIA files against each plant. It is the fastest way to find the plant nearest a given town.

CountyPlantsNameplate MW
Sonoma41,481
Imperial18788.5
Lake3309.4
Inyo3272.2
Mono484.4

Geothermal Power Plants in California: FAQ

How many geothermal power plants are in California?
32, with 3 GW of nameplate capacity between them, spread over 5 counties. That is the EIA-860M operating count for 2026-07.
Is there a map of California geothermal power plants?
Yes — the map above. Each dot is one geothermal power plant, sized by nameplate capacity and placed at the coordinates EIA files for it.
Which is the largest geothermal power plant in California?
Geysers Unit 5-20, at 1 GW. The table is sorted largest first, so the rest follow it.
Is there a geothermal power plant near me in California?
The county roll-up below groups every plant by county, which is the quickest way to find the one closest to a given town.
Which grid operator runs California's geothermal power plants?
No single ISO or RTO covers most of them. EIA files each plant against its own balancing authority, which in California is largely a vertically integrated utility rather than an organised market.
How current is this, and what is left out?
EIA-860M for 2026-07. EIA technology "Geothermal". Plants below 1 MW are not surveyed by EIA and so are absent; retirements and additions after 2026-07 arrive with the next monthly release.