Raft River Geothermal Power Plant — Plant Summary
- EIA Plant ID
- 56317
- Capacity
- 18 MW
- Primary Fuel
- Geothermal
- Technology
- Geothermal
- Status
- Operating
- Location
- Cassia, ID
- Operating Since
- 2008
- Generators
- 1
- Operator
- US Geothermal Inc.
- Parent Company
- —
- Annual Generation
- 92,031 MWh
- Capacity Factor
- 58.2%
- Balancing Authority
- Bonneville Power Administration
- ISO/RTO
- —
- NERC Region
- WECC
Raft River Geothermal Power Plant
OperatingGeothermal
Ranked #1 of 1 Geothermal plants in ID#58 of 70 nationally
18 MW Geothermal operating in Cassia, ID — Bonneville Power Administration
EIAGEMWD
18 MW
Nameplate Capacity
1
Generators
unit
Geothermal
Technology
2008
Operating Since
Location
Coordinates
42.0994, -113.3825
County
Cassia, ID
Ownership & Operator
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 | US Geothermal Inc. | US Geothermal Inc [100%] | — |
| Owner(s) | Raft River Energy 1 LLC | US Geothermal Inc [100%] | — |
| Status | Operating | operating | — |
Ownership Chain
GEM identifies the owner as US Geothermal Inc [100%]
This entity is not yet in the GEM ownership database — chain unavailable.
About
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
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
Bonneville Power Administration
Grid Voltage
34.5 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Generation
8.2K MWh
Latest Month
92.0K MWh
Annual Generation
58.2%
Capacity Factor
Jan 2022 – Dec 2024
Financial Data
No financial data available for this plant.
Pricing & Market Data
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
News & Articles (10)Beta
Industry·corporate
Geothermal Energy in the United States: Overview, Developments, Exploration Areas, and Leading Companies
Harnessing Earth's Heat for a Sustainable Future. Overview of Geothermal Energy in the United States. Geothermal energy, derived from the natural heat...
United States (other)
EnergyNow.com·5 months ago
Industry·corporate
Irrigated Lands in Idaho
When NASA's extensive Landsat image library collection was opened free to the public around 2008, IDWR jumped at the chance to adopt a...
NASA (other)IDWR (other)
ArcGIS StoryMaps·3 years ago
Industry·technology
Inferring Geothermal Reservoir Processes at the Raft River Geothermal Field, Idaho, USA, Through Modeling InSAR-Measured Surface Deformation
This study aims at building a reservoir model that honors the available geological, hydrological, and geomechanical data and also produces ground surface...
Raft River Geothermal Field (operator)Idaho (other)
AGU Publications·7 years ago
Deals·m and a
U.S. Geothermal takes step for full ownership of Raft River geothermal plant, Idaho
US Geothermal has reached an agreement with Goldman Sachs, to acquire the remaining ownership interest in its 18 MW Raft River geothermal plant in Idaho.
US Geothermal (buyer)Goldman Sachs (seller)
ThinkGeoEnergy·8 years ago
Last updated 2026-03-14
View all 10 articles