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15 MW Geothermal operating in Mono, CA — California Independent System Operator
15 MW
Nameplate Capacity
3
Generators
units
Geothermal
Technology
1990
Operating Since
Coordinates
37.6455, -118.9096
County
Mono, 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 | Ormat Nevada Inc | Ormat Technology Inc | — |
| Owner(s) | Mammoth Pacific LP | Ormat Technology Inc | — |
| Status | Operating | operating | — |
GEM identifies the owner as Ormat Technology Inc
This entity is not yet in the GEM ownership database — chain unavailable.
Mammoth G3 is a 15 MW geothermal power plant located in Mono County, California. The plant began operating in 1990 and has three generators. Ormat Nevada Inc. is the plant's operator. It 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, Mammoth G3 generated 103,119 MWh of electricity, achieving a capacity factor of 78.3%. The plant utilizes geothermal resources as its primary fuel source. Among geothermal plants in California, Mammoth G3 ranks 28th out of 33, and nationally it ranks 60th 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
9.7K MWh
Latest Month
103.1K MWh
Annual Generation
78.3%
Capacity Factor
CO₂ Intensity
0 lb/MWh
NOx
0.000 lb/MWh
SO₂
2013
$2,851/kW
Est. Construction Cost
Total estimated cost: $42.8M
Point of Interconnection
Nearest Substation
Mommoth Pacific 1
Substation Distance
0.543 km
Coord Source
OSM spatial
Market Position
ISO/RTO Market
CAISO
LMP Node
CONTROLX_1_N009
Pricing Hub
TH_SP15_GEN-APND
Alt. Hub / Zone
TH_NP15_GEN-APND
Location Type
Pricing Node
Node Source
Curated node match
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ask pi about Mammoth G3California Independent System Operator (CISO)
Grid Voltage
33.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
0.000 lb/MWh
CH₄
—
N₂O
—
Capacity Factor
79.2%
Annual Net Gen
104 GWh
CO₂eq
0.000 lb/MWh
Subregion
WECC California