2. U.S. Power Plants
  3. California
  4. Lake County, CA
  5. Middletown, CA
  6. Calistoga Power Plant

Calistoga Power Plant

10350 Socrates Mine Road, Middletown, CA 95461

Plant Summary Information

Calistoga Power Plant is ranked #3 out of 62 geothermal power plants nationwide in terms of total annual net electricity generation.

Calistoga Power Plant is comprised of 2 generators and generated 113.6 GWh during the 3-month period between April 2025 to July 2025.

Plant NameCalistoga Power Plant
Utility NameGeysers Power Co LLC
LocationLake County, CA
Initial Operation DateMarch 1984
Last Update Jul 2025
Annual Generation 458.6 GWh
Annual Consumption 1.7 M MMBtu
Ranked #1,417 out of 12,530 Power Plants Nationwide
Ranked #3 out of 62 Geothermal Power Plants Nationwide
Ranked #91 out of 1,600 California Power Plants
Ranked #2 out of 29 California Geothermal Power Plants
Fuel Types Geothermal

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Monthly Net Generation for Calistoga Power Plant

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Calistoga Power Plant Details

Summary Information
Plant NameCalistoga Power Plant (50066)
Plant Address10350 Socrates Mine Road, Middletown, CA 95461
UtilityGeysers Power Co LLC (7160)
Latitude, Longitude38.7879, -122.7434
Generation Dates on FileJan 2001 to Jul 2025
Initial Operation DateMarch 1984
Annual Generation 458.6 GWh
Fuel Types Geothermal
 
Federal Energy Regulatory Commission (FERC) Information
FERC Cogeneration StatusNo
FERC Small Power Producer StatusYes
FERC Small Power Producer Docket Number81-7-000
FERC Exempt Wholesale Generator StatusNo
Regulatory Information
Regulatory StatusNon-Regulated
NERC RegionWECC
Balancing AuthorityCalifornia Independent System Operator (CISO)
NAICS CodeUtilities (22)
Sector IPP Non-CHP (2)
Water SourceWells
Ash Impoundment
Transmission / Distribution OwnerPacific Gas & Electric Co (14328) CA
Grid Voltage 230.00 kV
Energy StorageNo

* Data obtained from the 2024 EIA 860 Report

Generator UNT1 Details Operating March 1984

TechnologyGeothermal
Prime MoverSteam Turbine
OwnershipSingle Owner
Nameplate Capacity88.2 MW
Nameplate Power Factor1
Summer Capacity50 MW
Winter Capacity55 MW
Minimum Load15 MW
Uprate/Derate Completed No
StatusOperating
First Operation DateMarch 1984
Combined Heat & Power No
Sector NameIPP Non-CHP (2)
Energy SourceGeothermal
Startup SourceGeothermal
Solid Fuel Gasification No
Carbon Capture TechnologyNo
Time From Cold Shutdown To Full Load12H
Multiple FuelsNo

Generator UNT2 Details Operating March 1984

TechnologyGeothermal
Prime MoverSteam Turbine
OwnershipSingle Owner
Nameplate Capacity88.2 MW
Nameplate Power Factor1
Summer Capacity50 MW
Winter Capacity55 MW
Minimum Load15 MW
Uprate/Derate Completed No
StatusOperating
First Operation DateMarch 1984
Combined Heat & Power No
Sector NameIPP Non-CHP (2)
Energy SourceGeothermal
Startup SourceGeothermal
Solid Fuel Gasification No
Carbon Capture TechnologyNo
Time From Cold Shutdown To Full Load12H
Multiple FuelsNo

Calistoga Power Plant Plant Owners

Owner NameAddressGeneratorOwnership
We couldn't locate any owners for this plant

Power Plants with Similar Net Generation

Power plants with a similar annual net generation from Geothermal.

RankPlant NamePlant LocationAnnual Generation
#1Geysers Unit 5-20Middletown, CA4.4 TWh
#2McGinness HillsAustin, NV602.8 GWh
#4Sonoma California GeothermalMiddletown, CA447.6 GWh
#5John L. Featherstone PlantCalipatria, CA432.4 GWh
#6McGinness Hills 3Austin, NV407.0 GWh
#7Heber GeothermalHeber, CA384.9 GWh
#8Coso Finance PartnersInyokern, CA376.0 GWh
#9Geothermal 1Middletown, CA370.2 GWh
#10Dixie ValleyFallon, NV341.0 GWh
#11Del Ranch CompanyCalipatria, CA326.3 GWh
#12Geothermal 2Middletown, CA316.9 GWh
#13Salton Sea Power Gen Co - Unit 3Calipatria, CA314.9 GWh
#14Second Imperial GeothermalHeber, CA302.3 GWh
#15Coso Power DevelopersInyokern, CA298.2 GWh
#16Salton Sea Power LLC - Unit 5Calipatria, CA290.3 GWh
#17CD4Mammoth Lakes, CA276.9 GWh
#18BlundellMilford, UT272.5 GWh
#19Tungsten MountainFallon, NV295.8 GWh
#20Puna Geothermal Venture IPahoa, HI258.9 GWh
#21Coso Energy DevelopersInyokern, CA244.2 GWh

Nearby Power Plants

Below are closest 20 power plants surrounding Calistoga Power Plant.

Plant NamePlant LocationAnnual GenerationDistance
Aidlin Geothermal Power PlantMiddletown, CA81.3 GWh8.1 mi
ASTICloverdale, CA1.2 GWh12.6 mi
BeringerSaint Helena, CA1.4 GWh23.9 mi
Bodega Avenue Solar LLCPetaluma, CA4.5 GWh36.4 mi
Cloverdale Solar CenterCloverdale, CA2.1 GWh15 mi
Cloverdale Solar ICloverdale, CA2.2 GWh14.8 mi
Dissigno Healdsburg FPV, LLCHealdsburg, CA6.0 GWh15.5 mi
Geothermal 1Middletown, CA370.2 GWh2.8 mi
Geothermal 2Middletown, CA316.9 GWh3.2 mi
Geysers Unit 5-20Middletown, CA4.4 TWh0.8 mi
Indian Valley Dam Hydro ProjectClearlake Oaks, CA6.0 GWh23 mi
Keysight - Santa RosaSanta Rosa, CA12.8 GWh21.2 mi
Laguna Water Reclamation FacilitySanta Rosa, CA11.2 GWh29 mi
Lake MendocinoUkiah, CA12.3 GWh36.9 mi
Santa Rosa Junior College Petaluma SolarPetaluma, CA1.8 GWh22.1 mi
Sonoma California GeothermalMiddletown, CA447.6 GWh0.7 mi
Sonoma Central Landfill Phase IPetaluma, CA5.6 GWh33.6 mi
Sonoma Central Landfill Phase IIPetaluma, CA5.0 GWh33.6 mi
Sutter Santa Rosa SolarSanta Rosa, CA2.3 GWh20.3 mi
Windsor Floating SolarWindsor, CA2.5 GWh17.6 mi