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78 MW Geothermal operating in Lake, CA — California Independent System Operator
78 MW
Nameplate Capacity
1
Generators
unit
Geothermal
Technology
1983
Operating Since
Coordinates
38.7903, -122.7559
County
Lake, CA
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Geysers Power Co LLC | Geysers Power | — |
| Owner(s) | Geysers Power Co LLC | — | — |
| Status | Operating | operating | — |
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
ISO/RTO
CAISO
Market
ISO/RTO Member
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
36.1K MWh
Latest Month
447.6K MWh
Annual Generation
65.3%
Capacity Factor
CO₂ Intensity
89 lb/MWh
NOx
0.001 lb/MWh
SO₂
2013
$2,851/kW
Est. Construction Cost
Total estimated cost: $222.4M
Point 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
Last updated 2026-03-26
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ask pi about Sonoma California GeothermalCalifornia Independent System Operator (CISO)
Grid Voltage
230.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
0.000 lb/MWh
CH₄
—
N₂O
—
Capacity Factor
63.2%
Annual Net Gen
432 GWh
CO₂eq
89 lb/MWh
Subregion
WECC California