Sonoma California Geothermal — Plant Summary
- EIA Plant ID
- 510
- Capacity
- 78 MW
- Primary Fuel
- Geothermal
- Technology
- Geothermal
- Status
- Operating
- Location
- Lake, CA
- Operating Since
- 1983
- Generators
- 1
- Operator
- Geysers Power Co LLC
- Parent Company
- —
- Annual Generation
- 447,631 MWh
- Capacity Factor
- 65.3%
- Balancing Authority
- California Independent System Operator
- ISO/RTO
- CAISO
- NERC Region
- WECC
Sonoma California Geothermal
OperatingGeothermal
Ranked #10 of 33 Geothermal plants in CA#13 of 70 nationally
78 MW Geothermal operating in Lake, CA — California Independent System Operator
EIAGEMWD
78 MW
Nameplate Capacity
1
Generators
unit
Geothermal
Technology
1983
Operating Since
Location
Coordinates
38.7903, -122.7559
County
Lake, CA
Nearby Plants
- Calistoga Power PlantGeothermal176.4 MW · 1.1 km
- Geysers Unit 5-20Geothermal1163 MW · 1.8 km
- West Ford FlatBESS25 MW · 3.0 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Geysers Power Co LLC | Geysers Power | — |
| Owner(s) | Geysers Power Co LLC | — | — |
| Status | Operating | operating | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
Sonoma California Geothermal is a 78 MW geothermal power plant located in Lake County, California. The plant began operating in 1983 and has one generator. It is owned and operated by Geysers Power Co LLC. The plant is interconnected to the California Independent System Operator (CAISO) balancing authority within the Western Electricity Coordinating Council (WECC) NERC region.
In the most recent year of data, Sonoma California Geothermal produced 447,631 MWh of electricity, operating at a capacity factor of 65.3%. The plant is the 10th largest geothermal power plant in California (out of 33) and the 13th largest in the United States (out of 70).
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
California Independent System Operator
Grid Voltage
230 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Generation
36.1K MWh
Latest Month
447.6K MWh
Annual Generation
65.3%
Capacity Factor
Jan 2022 – Dec 2024
Financial Data
No financial data available for this plant.
Pricing & Market Data
HIGH confidencePoint of Interconnection
Nearest Substation
Sonoma 3
Substation Distance
0.14 km
Coord Source
OSM spatial
Market Position
ISO/RTO Market
CAISO
LMP Node
SANTFG_7_UNITS-APND
Pricing Hub
TH_NP15_GEN-APND
Location Type
Aggregated Node
Node Source
Curated node match
News & Articles (10)Beta
General
Wesley Brooks
Wesley Brooks 4/4/1942 - 5/16/2025 Wesley "Wes" Allen Brooks. age 83, was born April 4,1942 in Healdsburg California and passed peacefully...
The Press Democrat·2 days ago
Hazards·earthquake
A cluster of 30 earthquakes hits Northern Calif. day after Sonoma 4.0 quake
Thirty minor earthquakes rattled Northern California on Monday morning following a series of quakes in Sonoma County, including one with a...
SFGATE·3 months ago
Regulatory·permitting
Bills advancing in Sacramento could spark geothermal boom in Mendocino County
Assembly bills 527 and 531 would streamline permitting for geothermal projects, a move supporters say is key to renewable energy goals and...
Sacramento (other)Mendocino County (other)
The Mendocino Voice·7 months ago
Hazards·earthquake
What's behind the more than 130 small earthquakes hitting Northern California? - Los Angeles Times
A series of more than 100 earthquakes has hit Northern California, shaking up the Geysers geothermal steam field in Sonoma and Lake counties...
Los Angeles Times·7 months ago
Last updated 2026-03-14
View all 10 articles