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92.2 MW Geothermal operating in Inyo, CA — California Independent System Operator
92.2 MW
Nameplate Capacity
3
Generators
units
Geothermal
Technology
1987
Operating Since
Coordinates
36.0372, -117.7981
County
Inyo, CA
Nearby Plants
Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Coso Operating Co LLC | Coso Operating | — |
| Owner(s) | Coso Operating Co LLC | Atlantica Sustainable Infrastructure | — |
| Status | Operating | operating | — |
Coso Finance Partners is a 92.2 MW geothermal power plant located in Inyo County, California. The plant began operating in 1987 and consists of 3 generators utilizing geothermal technology. It is owned by Atlantica Sustainable Infrastructure, a company based in the United Kingdom, and operated by Coso Operating Co LLC.
The plant's latest annual generation was 364,954 MWh, resulting in a capacity factor of 45.2%. Coso Finance Partners is interconnected to the California Independent System Operator (CAISO) balancing authority within the Western Electricity Coordinating Council (WECC) NERC region. It is the 5th largest geothermal plant in California out of 33, and the 8th 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
California Independent System Operator (CISO)
Grid Voltage
115.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
32.3K MWh
Latest Month
365.0K MWh
Annual Generation
45.2%
Capacity Factor
CO₂ Intensity
89 lb/MWh
NOx
0.001 lb/MWh
SO₂
0.000 lb/MWh
CH₄
—
N₂O
—
Capacity Factor
52.7%
Annual Net Gen
426 GWh
CO₂eq
89 lb/MWh
Subregion
WECC California
2013
$2,851/kW
Est. Construction Cost
Total estimated cost: $262.8M
Market Position
ISO/RTO Market
CAISO
LMP Node
CALGEN_1_UNITS-APND
Pricing Hub
TH_ZP26_GEN-APND
Location Type
Aggregated Node
Node Source
Curated node match
Last updated 2026-03-26
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