2. U.S. Power Plants
  3. California
  4. Sonoma County, CA
  5. Middletown, CA
  6. Aidlin Geothermal Power Plant

Aidlin Geothermal Power Plant

10350 Socrates Mine Road, Middletown, CA 95425

Plant Summary Information

Aidlin Geothermal Power Plant is ranked #41 out of 63 geothermal power plants nationwide in terms of total annual net electricity generation.

Aidlin Geothermal Power Plant is comprised of 2 generators and generated 22.0 GWh during the 3-month period between September 2025 to December 2025.

Plant NameAidlin Geothermal Power Plant
Utility NameGeysers Power Co LLC
LocationSonoma County, CA
Initial Operation DateMay 1989
Last Update Dec 2025
Annual Generation 82.4 GWh
Annual Consumption 308.5 k MMBtu
Ranked #3,719 out of 13,081 Power Plants Nationwide
Ranked #41 out of 63 Geothermal Power Plants Nationwide
Ranked #372 out of 1,606 California Power Plants
Ranked #22 out of 30 California Geothermal Power Plants
Fuel Types Geothermal

Map of Aidlin Geothermal Power Plant

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Monthly Net Generation for Aidlin Geothermal Power Plant

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Monthly Plant Fuel Consumption for Aidlin Geothermal Power Plant

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Aidlin Geothermal Power Plant Details

Summary Information
Plant NameAidlin Geothermal Power Plant (52158)
Plant Address10350 Socrates Mine Road, Middletown, CA 95425
UtilityGeysers Power Co LLC (7160)
Latitude, Longitude38.8339, -122.881
Generation Dates on FileJan 2001 to Dec 2025
Initial Operation DateMay 1989
Annual Generation 82.4 GWh
Fuel Types Geothermal
 
Federal Energy Regulatory Commission (FERC) Information
FERC Cogeneration StatusNo
FERC Small Power Producer StatusYes
FERC Small Power Producer Docket Number89-47-002
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 115.00 kV
Energy StorageNo

* Data obtained from the 2025 EIA 860 Report

Generator GEN1 Details Operating May 1989

TechnologyGeothermal
Prime MoverSteam Turbine
OwnershipSingle Owner
Nameplate Capacity12.5 MW
Nameplate Power Factor0.9
Summer Capacity9 MW
Winter Capacity10 MW
Minimum Load8 MW
Uprate/Derate Completed No
StatusOperating
First Operation DateMay 1989
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 GEN2 Details Operating May 1989

TechnologyGeothermal
Prime MoverSteam Turbine
OwnershipSingle Owner
Nameplate Capacity12.5 MW
Nameplate Power Factor0.9
Summer Capacity9 MW
Winter Capacity10 MW
Minimum Load8 MW
Uprate/Derate Completed No
StatusOperating
First Operation DateMay 1989
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

Aidlin Geothermal 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
#31Cove FortCove Fort, UT142.1 GWh
#32Ormesa IIHoltville, CA131.7 GWh
#33Tuscarora Geothermal Power PlantTuscarora, NV119.8 GWh
#34Soda Lake 3Fallon, NV108.3 GWh
#35Don A Campbell 1 GeothermalGabbs, NV97.0 GWh
#36Richard Burdette GeothermalReno, NV88.8 GWh
#37Don A Campbell 2 GeothermalLuning, NV88.6 GWh
#38Raft River Geothermal Power PlantMalta, ID88.1 GWh
#39Mammoth G2Mammoth Lakes, CA83.8 GWh
#40BradyFallon, NV83.3 GWh
#42Desert Peak Power PlantFernley, NV78.2 GWh
#43Patua Acquisition Project, LLCHazen, NV103.3 GWh
#44Galena 3 Geothermal Power PlantReno, NV77.9 GWh
#45Salton Sea Power Gen Co - Unit 1Calipatria, CA77.1 GWh
#46San EmidioGerlach, NV76.4 GWh
#47Mammoth G3Mammoth Lakes, CA75.3 GWh
#48Salton Sea Power Gen Co - Unit 2Calipatria, CA74.8 GWh
#49Steamboat IIIReno, NV72.7 GWh
#50Lightning Dock GeothermalAnimas, NM72.3 GWh
#51Ormesa IHoltville, CA70.2 GWh

Nearby Power Plants

Below are closest 20 power plants surrounding Aidlin Geothermal Power Plant.

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