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10 MW Geothermal operating in Mono, CA — California Independent System Operator
10 MW
Nameplate Capacity
2
Generators
units
Geothermal
Technology
1984
Operating Since
Coordinates
37.6451, -118.9143
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 G1 is a 10 MW geothermal power plant located in Mono County, California. The plant began operating in 1984 and is owned and operated by Ormat Nevada Inc. It consists of two generators utilizing geothermal technology. The plant operates within the California Independent System Operator (CAISO) balancing authority and the Western Electricity Coordinating Council (WECC) NERC region.
In the most recent year of data, Mammoth G1 generated 59,620 MWh of electricity, achieving a capacity factor of 67.9%. The plant ranks 31st out of 33 power plants in California and 65th out of 70 nationally.
Generated from EIA, GEM, and public data sources
ISO/RTO
CAISO
Market
ISO/RTO Member
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
5.3K MWh
Latest Month
59.6K MWh
Annual Generation
67.9%
Capacity Factor
CO₂ Intensity
0 lb/MWh
NOx
0.000 lb/MWh
SO₂
2013
$2,851/kW
Est. Construction Cost
Total estimated cost: $28.5M
Point of Interconnection
Nearest Substation
Mommoth Pacific 1
Substation Distance
0.154 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 G1California 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
65.8%
Annual Net Gen
58 GWh
CO₂eq
0.000 lb/MWh
Subregion
WECC California