Sonoma California Geothermal
10350 Socrates Mine Road, Middletown, CA 95461Plant Summary Information
Sonoma California Geothermal is ranked #6 out of 63 geothermal power plants nationwide in terms of total annual net electricity generation.
Sonoma California Geothermal is comprised of 1 generator and generated 107.6 GWh during the 3-month period between September 2025 to December 2025.
| Plant Name | Sonoma California Geothermal |
|---|---|
| Utility Name | Geysers Power Co LLC |
| Location | Lake County, CA |
| Initial Operation Date | December 1983 |
| Last Update | Dec 2025 |
| Annual Generation | 435.6 GWh |
| Annual Consumption | 1.6 M MMBtu |
| Ranked #1,520 out of 13,081 Power Plants Nationwide | |
| Ranked #6 out of 63 Geothermal Power Plants Nationwide | |
| Ranked #100 out of 1,606 California Power Plants | |
| Ranked #3 out of 30 California Geothermal Power Plants | |
| Fuel Types | Geothermal |
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Monthly Net Generation for Sonoma California Geothermal
Monthly Plant Fuel Consumption for Sonoma California Geothermal
Sonoma California Geothermal Details
| Summary Information | |
|---|---|
| Plant Name | Sonoma California Geothermal (510) |
| Plant Address | 10350 Socrates Mine Road, Middletown, CA 95461 |
| Utility | Geysers Power Co LLC (7160) |
| Latitude, Longitude | 38.7903, -122.7559 |
| Generation Dates on File | Jan 2001 to Dec 2025 |
| Initial Operation Date | December 1983 |
| Annual Generation | 435.6 GWh |
| Fuel Types | Geothermal |
| Federal Energy Regulatory Commission (FERC) Information | |
| FERC Cogeneration Status | No |
| FERC Small Power Producer Status | Yes |
| FERC Small Power Producer Docket Number | 98-95-000 |
| FERC Exempt Wholesale Generator Status | No |
| Regulatory Information | |
|---|---|
| Regulatory Status | Non-Regulated |
| NERC Region | WECC |
| Balancing Authority | California Independent System Operator (CISO) |
| NAICS Code | Utilities (22) |
| Sector | IPP Non-CHP (2) |
| Water Source | Wells |
| Ash Impoundment | |
| Transmission / Distribution Owner | Pacific Gas & Electric Co (14328) CA |
| Grid Voltage | 230.00 kV |
| Energy Storage | No |
Generator 1 Details Operating December 1983
| Technology | Geothermal |
|---|---|
| Prime Mover | Steam Turbine |
| Ownership | Single Owner |
| Nameplate Capacity | 78 MW |
| Nameplate Power Factor | 0.9 |
| Summer Capacity | 50 MW |
| Winter Capacity | 55 MW |
| Minimum Load | 10 MW |
| Uprate/Derate Completed | No |
| Status | Operating |
| First Operation Date | December 1983 |
|---|---|
| Combined Heat & Power | No |
| Sector Name | IPP Non-CHP (2) |
| Energy Source | Geothermal |
| Startup Source | Geothermal |
| Solid Fuel Gasification | No |
| Carbon Capture Technology | No |
| Time From Cold Shutdown To Full Load | 12H |
| Multiple Fuels | No |
Sonoma California Geothermal Plant Owners
| Owner Name | Address | 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 |
|---|---|---|---|
| #1 | Geysers Unit 5-20 | Middletown, CA | 4.2 TWh |
| #2 | McGinness Hills | Austin, NV | 568.6 GWh |
| #3 | Dixie Valley | Fallon, NV | 463.5 GWh |
| #4 | McGinness Hills 3 | Austin, NV | 462.7 GWh |
| #5 | Calistoga Power Plant | Middletown, CA | 453.8 GWh |
| #7 | John L. Featherstone Plant | Calipatria, CA | 428.7 GWh |
| #8 | Heber Geothermal | Heber, CA | 376.3 GWh |
| #9 | Elmore Company | Calipatria, CA | 368.1 GWh |
| #10 | Coso Finance Partners | Inyokern, CA | 363.8 GWh |
| #11 | Geothermal 2 | Middletown, CA | 363.4 GWh |
| #12 | Salton Sea Power Gen Co - Unit 4 | Calipatria, CA | 321.2 GWh |
| #13 | Coso Power Developers | Inyokern, CA | 315.8 GWh |
| #14 | Geothermal 1 | Middletown, CA | 307.7 GWh |
| #15 | Del Ranch Company | Calipatria, CA | 297.8 GWh |
| #16 | Salton Sea Power LLC - Unit 5 | Calipatria, CA | 295.9 GWh |
| #17 | Salton Sea Power Gen Co - Unit 3 | Calipatria, CA | 288.8 GWh |
| #18 | Second Imperial Geothermal | Heber, CA | 275.2 GWh |
| #19 | Blundell | Milford, UT | 271.2 GWh |
| #20 | CE Leathers | Calipatria, CA | 270.5 GWh |
| #21 | Tungsten Mountain | Fallon, NV | 283.1 GWh |
Nearby Power Plants
Below are closest 20 power plants surrounding Sonoma California Geothermal.
| Plant Name | Plant Location | Annual Generation | Distance |
|---|---|---|---|
| Aidlin Geothermal Power Plant | Middletown, CA | 82.4 GWh | 7.4 mi |
| ASTI | Cloverdale, CA | 1.2 GWh | 12 mi |
| Beringer | Saint Helena, CA | 1.6 GWh | 24.4 mi |
| Bodega Avenue Solar LLC | Petaluma, CA | 3.8 GWh | 36.6 mi |
| Calistoga Power Plant | Middletown, CA | 453.8 GWh | 0.7 mi |
| Cloverdale Solar Center | Cloverdale, CA | 1.8 GWh | 14.3 mi |
| Cloverdale Solar I | Cloverdale, CA | 1.5 GWh | 14.2 mi |
| Dissigno Healdsburg FPV, LLC | Healdsburg, CA | 5.6 GWh | 15.4 mi |
| Geothermal 1 | Middletown, CA | 307.7 GWh | 3.3 mi |
| Geothermal 2 | Middletown, CA | 363.4 GWh | 3.7 mi |
| Geysers Unit 5-20 | Middletown, CA | 4.2 TWh | 1.1 mi |
| Indian Valley Dam Hydro Project | Clearlake Oaks, CA | 11.2 GWh | 23.2 mi |
| Keysight - Santa Rosa | Santa Rosa, CA | 34.5 GWh | 21.4 mi |
| Laguna Water Reclamation Facility | Santa Rosa, CA | 9.4 GWh | 29.1 mi |
| Lake Mendocino | Ukiah, CA | 12.3 GWh | 36.4 mi |
| Santa Rosa Junior College Petaluma Solar | Petaluma, CA | 1.7 GWh | 22.3 mi |
| Sonoma Central Landfill Phase I | Petaluma, CA | 583.0 MWh | 33.8 mi |
| Sonoma Central Landfill Phase II | Petaluma, CA | 1.8 GWh | 33.8 mi |
| Sutter Santa Rosa Solar | Santa Rosa, CA | 2.1 GWh | 20.4 mi |
| Windsor Floating Solar | Windsor, CA | 2.6 GWh | 17.6 mi |