Geothermal 1 — Plant Summary
- EIA Plant ID
- 7368
- Capacity
- 110 MW
- Primary Fuel
- Geothermal
- Technology
- Geothermal
- Status
- Operating
- Location
- Sonoma, CA
- Operating Since
- 1983
- Generators
- 2
- Operator
- Northern California Power Agny
- Parent Company
- —
- Annual Generation
- 338,449 MWh
- Capacity Factor
- 35.2%
- Balancing Authority
- California Independent System Operator
- ISO/RTO
- CAISO
- NERC Region
- WECC
Geothermal 1
OperatingGeothermal
Ranked #3 of 33 Geothermal plants in CA#5 of 70 nationally
110 MW Geothermal operating in Sonoma, CA — California Independent System Operator
EIAGEMWD
110 MW
Nameplate Capacity
2
Generators
units
Geothermal
Technology
1983
Operating Since
Location
Coordinates
38.7520, -122.7195
County
Sonoma, CA
Nearby Plants
- Geothermal 2Geothermal110 MW · 0.7 km
- Bear CanyonBESS13 MW · 2.6 km
- Geysers Unit 5-20Geothermal1163 MW · 3.6 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Northern California Power Agny | Northern California Power Agency | — |
| Owner(s) | Northern California Power Agny | — | — |
| Status | Operating | operating | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
Geothermal 1 is a 110 MW geothermal power plant located in Sonoma County, California. The plant began operating in 1983 and is owned and operated by Northern California Power Agency. It utilizes geothermal technology and consists of two generators. The plant operates within the California Independent System Operator (CAISO) balancing authority and the Western Electricity Coordinating Council (WECC) NERC region.
In the latest year of reported data, Geothermal 1 generated 338,449 MWh of electricity, achieving a capacity factor of 35.2%. The plant is ranked as the 4th largest geothermal power plant in California, and 6th nationally out of 7 geothermal plants.
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
RE
Entity Type
Political Subdivision
Sector
Electric Utility
Generation
26.5K MWh
Latest Month
338.4K MWh
Annual Generation
35.2%
Capacity Factor
Jan 2023 – Dec 2025
Financial Data
No financial data available for this plant.
Pricing & Market Data
MEDIUM confidenceMarket Position
ISO/RTO Market
CAISO
LMP Node
BERCYN_7_N001
Pricing Hub
TH_NP15_GEN-APND
Location Type
Pricing Node
Node Source
Curated node match
News & Articles (10)Beta
Industry·technology
Manitoba offers up new incentives to shift to heat pumps, ditches election promise
The Manitoba government wants homeowners to upgrade their heating and cooling systems to a geothermal pump it says could save up to $1000...
Manitoba government (other)
CBC·9 months ago
Industry·corporate
How a Calgary geothermal company is making its mark across the Atlantic
A Calgary geothermal company, Eavor Technologies Inc., has been awarded a grant from the European Innovation Fund (EIF) in support of the Canadian firm's...
Eavor Technologies Inc. (developer)European Innovation Fund (other)
CBC·3 years ago
Industry·technology
Untapped potential: A solution for remote food production
Geothermal energy could help grow food security in isolated and Northern communities. August 24, 2022 By J. Lynn Fraser
Greenhouse Canada·3 years ago
Industry·technology
Alberta town embraces geothermal energy project with integrated vertical farm
Calgary-based Novus Earth is looking to harness geothermal energy to generate electricity and use it for growing food in a hydroponic farm...
Novus Earth (developer)
CBC·3 years ago
Last updated 2026-03-14
View all 10 articles