Raft River Geothermal Power Plant
Cassia County, Idaho · EIA plant ID 56317 · Operator: US Geothermal Inc.
×18 MW geothermal retired since 2020 (latest Mar 2025)
Nameplate16MWSummer 11 MW
Generators1in service
Net generation88GWh12 mo to Dec 2025
Capacity factor104%!geothermal units, summer MW
Heat rate—thermal plants only
First online2025
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), geothermal units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2008 | 85.5 | 136.4% | — |
| 2009 | 76 | 117.2% | — |
| 2010 | 71.8 | 82.0% | — |
| 2011 | 63.5 | 72.5% | — |
| 2012 | 74.7 | 85.0% | — |
| 2013 | 39.7 | 45.3% | — |
| 2014 | 78.8 | 90.0% | — |
| 2015 | 75.6 | 86.3% | — |
| 2016 | 72 | 82.0% | — |
| 2017 | 84.4 | 96.4% | — |
| 2018 | 83.1 | 94.9% | — |
| 2019 | 95.6 | 109.1% | — |
| 2020 | 90.6 | 103.1% | — |
| 2021 | 92.9 | 106.1% | — |
| 2022 | 91.4 | 104.4% | — |
| 2023 | 88.6 | 101.1% | — |
| 2024 | 92 | 104.8% | — |
| 2025 | 88.1 | 104.0% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| OEC1 | Geothermal | BT | 16 | 10.7 | Apr 2025 | Operating | — | coming soon |
| 1 | Geothermal | BT | 18 | 10 | Apr 2008 | Retired Mar 2025 | — | coming soon |
Owner / operator
Operator: US Geothermal Inc.. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Raft River Energy 1 LLC | 100.0% | 16 MW |
Nearby plants
Within 80 km.
| Golden Valley Wind Park LLC | 12 MW | 58.3 km |
| Burley Butte Windpark | 21 MW | 62.4 km |
| Minidoka | 28 MW | 64 km |
| Milner Butte LFGE | 4 MW | 65.5 km |
| Milner Dam Wind Park LLC | 20 MW | 65.9 km |
| Milner Hydro | 60 MW | 71.8 km |