65th largest plant in Idaho · 4943rd nationally
Raft River Geothermal Power Plant is a geothermal power plant in Idaho with a nameplate capacity of 18.0 MW. It generates roughly 88.6k MWh per year — enough to power about 8,437 average U.S. homes.
Its capacity factor of 56% puts it in the middle range — running steadily but not full-time.
| Plant Name | Raft River Geothermal Power Plant |
|---|---|
| Operator | Us Geothermal Inc. |
| City | Malta |
| County | Cassia County |
| State | Idaho |
| ZIP | 83342 |
| Coordinates | 42.09942, -113.38245 |
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| 1 | Geothermal | Geothermal | 18.0 MW | Operating | 2008 |
| 2 | Geothermal | Geothermal | 18.0 MW | Cancelled | — |
| Owner | Location | Share |
|---|---|---|
| Raft River Energy 1 Llc | Boise, ID | 10000.0% |
Ownership reported to EIA Form 860. Percentages reflect reported generator-level ownership share, averaged when a plant has multiple generators.
| NERC Region | WECC |
|---|---|
| Balancing Authority | Bonneville Power Administration |
Geothermal plants tap heat from underground reservoirs to spin steam turbines. They provide carbon-free baseload power with very high capacity factors, but they only work where hot rock is accessible — primarily in the western U.S.