Geothermal 1

12000 Ridge Road, Middletown, CA 95461

Plant Summary Information

Geothermal 1 is ranked #7 out of 63 geothermal power plants nationwide in terms of total annual net electricity generation.

Geothermal 1 is comprised of 2 generators and generated 112.3 GWh during the 3-month period between December 2024 to March 2025.

Plant NameGeothermal 1
Utility NameNorthern California Power Agny
LocationSonoma County, CA
Initial Operation DateJanuary 1983
Last Update Mar 2025
Annual Generation 389.3 GWh
Annual Consumption 1.3 M MMBtu
Ranked #1,578 out of 12,016 Power Plants Nationwide
Ranked #7 out of 63 Geothermal Power Plants Nationwide
Ranked #114 out of 1,581 California Power Plants
Ranked #5 out of 30 California Geothermal Power Plants
Fuel Types Geothermal

Map of Geothermal 1

Full Screen Map
Use Ctrl + scroll to zoom the map
Use two fingers to move the map

Register Now for Comprehensive Access

Subscribe now to access all power plant data, utility information, FERC EQR data, and more for Geothermal 1.

Create Your Account Today

Monthly Net Generation for Geothermal 1

60k60k50k50k40k40k30k30k20k20k10k10k00200220022003200320042004200520052006200620072007200820082009200920102010201120112012201220132013201420142015201520162016201720172018201820192019202020202021202120222022202320232024202420252025
Download SVG
Download PNG
Download CSV

Geothermal 1 Details

Summary Information
Plant NameGeothermal 1 (7368)
Plant Address12000 Ridge Road, Middletown, CA 95461
UtilityNorthern California Power Agny (40613)
Latitude, Longitude38.752, -122.7195
Generation Dates on FileJan 2002 to Mar 2025
Initial Operation DateJanuary 1983
Annual Generation 389.3 GWh
Fuel Types Geothermal
 
Federal Energy Regulatory Commission (FERC) Information
FERC Cogeneration StatusNo
FERC Small Power Producer StatusNo
FERC Exempt Wholesale Generator StatusNo
Regulatory Information
Regulatory StatusRegulated
NERC RegionWECC
Balancing AuthorityCalifornia Independent System Operator (CISO)
NAICS CodeUtilities (22)
Sector Electric Utility (1)
Water SourceGeothermal Condensate
Ash Impoundment No
Transmission / Distribution OwnerPacific Gas & Electric Co (14328) CA
Grid Voltage 230.00 kV
Energy StorageNo

Generator 1 Details Operating January 1983

TechnologyGeothermal
Prime MoverSteam Turbine
OwnershipSingle Owner
Nameplate Capacity55 MW
Nameplate Power Factor0.86
Summer Capacity30 MW
Winter Capacity32 MW
Minimum Load10 MW
Uprate/Derate Completed No
StatusOperating
First Operation DateJanuary 1983
Combined Heat & Power No
Sector NameElectric Utility (1)
Energy SourceGeothermal
Solid Fuel Gasification No
Carbon Capture TechnologyNo
Time From Cold Shutdown To Full Load12H
Multiple FuelsNo
Cofire FuelsNo

Generator 2 Details Operating January 1983

TechnologyGeothermal
Prime MoverSteam Turbine
OwnershipSingle Owner
Nameplate Capacity55 MW
Nameplate Power Factor0.86
Summer Capacity30 MW
Winter Capacity32 MW
Minimum Load10 MW
Uprate/Derate Completed No
StatusOperating
First Operation DateJanuary 1983
Combined Heat & Power No
Sector NameElectric Utility (1)
Energy SourceGeothermal
Solid Fuel Gasification No
Carbon Capture TechnologyNo
Time From Cold Shutdown To Full Load12H
Multiple FuelsNo
Cofire FuelsNo

Geothermal 1 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, NV642.5 GWh
#3Calistoga Power PlantMiddletown, CA468.4 GWh
#4McGinness Hills 3Austin, NV447.7 GWh
#5John L. Featherstone PlantCalipatria, CA437.4 GWh
#6Sonoma California GeothermalMiddletown, CA431.5 GWh
#8Coso Finance PartnersInyokern, CA374.7 GWh
#9Elmore CompanyCalipatria, CA359.4 GWh
#10Salton Sea Power Gen Co - Unit 3Calipatria, CA336.5 GWh
#11CE LeathersCalipatria, CA335.0 GWh
#12Second Imperial GeothermalHeber, CA326.6 GWh
#13Salton Sea Power Gen Co - Unit 4Calipatria, CA319.7 GWh
#14Del Ranch CompanyCalipatria, CA311.2 GWh
#15Coso Power DevelopersInyokern, CA307.8 GWh
#16Tungsten MountainFallon, NV332.1 GWh
#17Dixie ValleyFallon, NV303.5 GWh
#18Geothermal 2Middletown, CA303.1 GWh
#19Salton Sea Power LLC - Unit 5Calipatria, CA302.8 GWh
#20Coso Energy DevelopersInyokern, CA277.3 GWh
#21CD4Mammoth Lakes, CA272.3 GWh

Nearby Power Plants

Below are closest 20 power plants surrounding Geothermal 1.

Plant NamePlant LocationAnnual GenerationDistance
Aidlin Geothermal Power PlantMiddletown, CA77.3 GWh10.4 mi
ASTICloverdale, CA1.3 GWh13.8 mi
BeringerSaint Helena, CA1.3 GWh21.1 mi
Bodega Avenue Solar LLCPetaluma, CA4.1 GWh33.9 mi
Calistoga Power PlantMiddletown, CA468.4 GWh2.8 mi
Cloverdale Solar CenterCloverdale, CA2.3 GWh16.3 mi
Cloverdale Solar ICloverdale, CA1.6 GWh16.1 mi
Dissigno Healdsburg FPV, LLCHealdsburg, CA5.9 GWh14 mi
Geothermal 2Middletown, CA303.1 GWh0.5 mi
Geysers Unit 5-20Middletown, CA4.4 TWh2.2 mi
Indian Valley Dam Hydro ProjectClearlake Oaks, CA5.9 GWh24.7 mi
Keysight - Santa RosaSanta Rosa, CA34.4 GWh18.7 mi
Laguna Water Reclamation FacilitySanta Rosa, CA14.2 GWh26.6 mi
Monticello DamWinters, CA32.4 GWh37.1 mi
Santa Rosa Junior College Petaluma SolarPetaluma, CA1.8 GWh19.6 mi
Sonoma California GeothermalMiddletown, CA431.5 GWh3.3 mi
Sonoma Central Landfill Phase IPetaluma, CA8.1 GWh31.2 mi
Sonoma Central Landfill Phase IIPetaluma, CA6.6 GWh31.2 mi
West Ford FlatMiddletown, CA1.0 GWh2.5 mi
Windsor Floating SolarWindsor, CA2.5 GWh15.6 mi