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18 MW Geothermal operating in Cassia, ID — Bonneville Power Administration
18 MW
Nameplate Capacity
1
Generators
unit
Geothermal
Technology
2008
Operating Since
Coordinates
42.0994, -113.3825
County
Cassia, ID
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | US Geothermal Inc. | US Geothermal Inc | — |
| Owner(s) | Raft River Energy 1 LLC | US Geothermal Inc | — |
| Status | Operating | operating | — |
GEM identifies the owner as US Geothermal Inc
This entity is not yet in the GEM ownership database — chain unavailable.
The Raft River Geothermal Power Plant is located in Cassia County, Idaho. The plant has a total capacity of 18 MW and is fueled by geothermal energy (GEO). It began operating in 2008 and has one generator. US Geothermal Inc. is the owner and operator. The plant is connected to the Bonneville Power Administration balancing authority within the Western Electricity Coordinating Council (WECC) NERC region.
In the most recent year of data, the Raft River plant generated 92,031 MWh of electricity, achieving a capacity factor of 58.2%. It is the largest geothermal power plant in Idaho, and ranks 58th out of 70 geothermal plants nationally.
Generated from EIA, GEM, and public data sources
Grid Region
Pacific Northwest
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
8.2K MWh
Latest Month
92.0K MWh
Annual Generation
58.2%
Capacity Factor
CO₂ Intensity
0 lb/MWh
NOx
0.000 lb/MWh
SO₂
2013
$2,851/kW
Est. Construction Cost
Total estimated cost: $51.3M
This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
Last updated 2026-03-26
View all 10 articlesNo ask pi reports yet for this entity.
ask pi about Raft River Geothermal Power PlantBonneville Power Administration (BPAT)
Grid Voltage
34.5 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
0.000 lb/MWh
CH₄
—
N₂O
—
Capacity Factor
56.2%
Annual Net Gen
89 GWh
CO₂eq
0.000 lb/MWh
Subregion
WECC Northwest