Geothermal 1
12000 Ridge Road, Middletown, CA 95461Plant Summary Information
Geothermal 1 is ranked #16 out of 62 geothermal power plants nationwide in terms of total annual net electricity generation.
Geothermal 1 is comprised of 2 generators and generated 57.5 GWh during the 3-month period between December 2025 to March 2026.
| Plant Name | Geothermal 1 |
|---|---|
| Utility Name | Northern California Power Agny |
| Location | Sonoma County, CA |
| Initial Operation Date | January 1983 |
| Last Update | Mar 2026 |
| Annual Generation | 283.6 GWh |
| Annual Consumption | 1.1 M MMBtu |
| Ranked #2,062 out of 12,332 Power Plants Nationwide | |
| Ranked #16 out of 62 Geothermal Power Plants Nationwide | |
| Ranked #192 out of 1,530 California Power Plants | |
| Ranked #13 out of 29 California Geothermal Power Plants | |
| Fuel Types | Geothermal |
Map of Geothermal 1
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Monthly Net Generation for Geothermal 1
Monthly Plant Fuel Consumption for Geothermal 1
Geothermal 1 Details
| Summary Information | |
|---|---|
| Plant Name | Geothermal 1 (7368) |
| Plant Address | 12000 Ridge Road, Middletown, CA 95461 |
| Utility | Northern California Power Agny (40613) |
| Latitude, Longitude | 38.752, -122.7195 |
| Generation Dates on File | Jan 2002 to Mar 2026 |
| Initial Operation Date | January 1983 |
| Annual Generation | 283.6 GWh |
| Fuel Types | Geothermal |
| Federal Energy Regulatory Commission (FERC) Information | |
| FERC Cogeneration Status | No |
| FERC Small Power Producer Status | No |
| FERC Exempt Wholesale Generator Status | No |
| Regulatory Information | |
|---|---|
| Regulatory Status | Regulated |
| NERC Region | WECC |
| Balancing Authority | California Independent System Operator (CISO) |
| NAICS Code | Utilities (22) |
| Sector | Electric Utility (1) |
| Water Source | Geothermal Condensate |
| Ash Impoundment | No |
| Transmission / Distribution Owner | Pacific Gas & Electric Co (14328) CA |
| Grid Voltage | 230.00 kV |
| Energy Storage | No |
Generator 1 Details Operating January 1983
| Technology | Geothermal |
|---|---|
| Prime Mover | Steam Turbine |
| Ownership | Single Owner |
| Nameplate Capacity | 55 MW |
| Nameplate Power Factor | 0.86 |
| Summer Capacity | 30 MW |
| Winter Capacity | 32 MW |
| Minimum Load | 10 MW |
| Uprate/Derate Completed | No |
| Status | Operating |
| First Operation Date | January 1983 |
|---|---|
| Combined Heat & Power | No |
| Sector Name | Electric Utility (1) |
| Energy Source | Geothermal |
| Solid Fuel Gasification | No |
| Carbon Capture Technology | No |
| Time From Cold Shutdown To Full Load | 12H |
| Multiple Fuels | No |
| Cofire Fuels | No |
Generator 2 Details Operating January 1983
| Technology | Geothermal |
|---|---|
| Prime Mover | Steam Turbine |
| Ownership | Single Owner |
| Nameplate Capacity | 55 MW |
| Nameplate Power Factor | 0.86 |
| Summer Capacity | 30 MW |
| Winter Capacity | 32 MW |
| Minimum Load | 10 MW |
| Uprate/Derate Completed | No |
| Status | Operating |
| First Operation Date | January 1983 |
|---|---|
| Combined Heat & Power | No |
| Sector Name | Electric Utility (1) |
| Energy Source | Geothermal |
| Solid Fuel Gasification | No |
| Carbon Capture Technology | No |
| Time From Cold Shutdown To Full Load | 12H |
| Multiple Fuels | No |
| Cofire Fuels | No |
Geothermal 1 Plant Owners
| Owner Name | Address | Generator | Ownership | 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.
| Rank | Plant Name | Plant Location | Annual Generation |
|---|---|---|---|
| #6 | McGinness Hills 3 | Austin, NV | 431.3 GWh |
| #7 | John L. Featherstone Plant | Calipatria, CA | 431.0 GWh |
| #8 | Heber Geothermal | Heber, CA | 384.9 GWh |
| #9 | Coso Finance Partners | Inyokern, CA | 371.8 GWh |
| #10 | Geothermal 2 | Middletown, CA | 364.9 GWh |
| #11 | Del Ranch Company | Calipatria, CA | 326.3 GWh |
| #12 | Salton Sea Power Gen Co - Unit 3 | Calipatria, CA | 314.9 GWh |
| #13 | Coso Power Developers | Inyokern, CA | 312.1 GWh |
| #14 | Second Imperial Geothermal | Heber, CA | 302.3 GWh |
| #15 | Salton Sea Power LLC - Unit 5 | Calipatria, CA | 290.3 GWh |
| #17 | CD4 | Mammoth Lakes, CA | 276.9 GWh |
| #18 | Blundell | Milford, UT | 272.5 GWh |
| #19 | Puna Geothermal Venture I | Pahoa, HI | 258.9 GWh |
| #20 | Tungsten Mountain | Fallon, NV | 267.9 GWh |
| #21 | Coso Energy Developers | Inyokern, CA | 244.2 GWh |
| #22 | Steamboat Hills LP | Reno, NV | 231.7 GWh |
| #23 | Vulcan-BN Geothermal Power Company | Calipatria, CA | 227.2 GWh |
| #24 | North Valley | Gerlach, NV | 190.1 GWh |
| #25 | NGP Blue Mountain I LLC | Winnemucca, NV | 182.8 GWh |
| #26 | Salton Sea Power Gen Co - Unit 4 | Calipatria, CA | 179.8 GWh |
Nearby Power Plants
Below are closest 20 power plants surrounding Geothermal 1.
| Plant Name | Plant Location | Annual Generation | Distance |
|---|---|---|---|
| Aidlin Geothermal Power Plant | Middletown, CA | 81.3 GWh | 10.4 mi |
| ASTI | Cloverdale, CA | 1.2 GWh | 13.8 mi |
| Beringer | Saint Helena, CA | 1.4 GWh | 21.1 mi |
| Bodega Avenue Solar LLC | Petaluma, CA | 4.5 GWh | 33.9 mi |
| Calistoga Power Plant | Middletown, CA | 465.7 GWh | 2.8 mi |
| Cloverdale Solar Center | Cloverdale, CA | 2.1 GWh | 16.3 mi |
| Cloverdale Solar I | Cloverdale, CA | 2.2 GWh | 16.1 mi |
| Dissigno Healdsburg FPV, LLC | Healdsburg, CA | 6.0 GWh | 14 mi |
| Geothermal 2 | Middletown, CA | 364.9 GWh | 0.5 mi |
| Geysers Unit 5-20 | Middletown, CA | 4.3 TWh | 2.2 mi |
| Keysight - Santa Rosa | Santa Rosa, CA | 12.8 GWh | 18.7 mi |
| Laguna Water Reclamation Facility | Santa Rosa, CA | 11.2 GWh | 26.6 mi |
| Lavio Solar | Petaluma, CA | 1.7 GWh | 38.6 mi |
| Monticello Dam | Winters, CA | 36.4 GWh | 37.1 mi |
| Sonoma California Geothermal | Middletown, CA | 447.6 GWh | 3.3 mi |
| Sonoma Central Landfill Phase I | Petaluma, CA | 5.6 GWh | 31.2 mi |
| Sonoma Central Landfill Phase II | Petaluma, CA | 5.0 GWh | 31.2 mi |
| Stage Gulch Solar | Petaluma, CA | 1.5 GWh | 38.2 mi |
| Sutter Santa Rosa Solar | Santa Rosa, CA | 2.3 GWh | 17.9 mi |
| Windsor Floating Solar | Windsor, CA | 2.5 GWh | 15.6 mi |