OREG 1 Inc
Roosevelt County, Montana · EIA plant ID 56833 · Operator: Ormat Nevada Inc
Nameplate30MWSummer 20 MW
Generators4in service
Net generation128GWh12 mo to Aug 2026
Capacity factor73%other units, summer MW
Heat rate—thermal plants only
First online2006
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
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), other 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 | 111.4 | — | — |
| 2009 | 79.5 | 41.3% | — |
| 2010 | 140.7 | 73.0% | — |
| 2011 | 176.6 | 91.6% | — |
| 2012 | 175.8 | 91.0% | — |
| 2013 | 173.2 | 89.9% | — |
| 2014 | 131.6 | 68.3% | — |
| 2015 | 152 | 78.9% | — |
| 2016 | 153 | 79.2% | — |
| 2017 | 166 | 86.2% | — |
| 2018 | 164.3 | 93.8% | — |
| 2019 | 156.5 | 89.3% | — |
| 2020 | 132.8 | 75.6% | — |
| 2021 | 156.3 | 89.2% | — |
| 2022 | 153.8 | 87.8% | — |
| 2023 | 138.5 | 79.1% | — |
| 2024 | 146.2 | 83.2% | — |
| 2025 | 134.6 | 76.8% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| CS10 | All Other | OT | 7.5 | 5 | Oct 2006 | Operating | — | coming soon |
| CS11 | All Other | OT | 7.5 | 5 | Aug 2006 | Operating | — | coming soon |
| CS7 | All Other | OT | 7.5 | 5 | Jul 2006 | Operating | — | coming soon |
| CS9 | All Other | OT | 7.5 | 5 | Aug 2006 | Operating | — | coming soon |
Owner / operator
Operator: Ormat Nevada Inc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Ormat Nevada Inc | 100.0% | 30 MW |
Nearby plants
Within 80 km.
| OREG 2 Inc | 30 MW | 0 km |
| Culbertson Generation Station | 108 MW | 0.6 km |
| Pioneer Generating Station | 897 MW | 33 km |
| Sidney MT Plant | retired | 58.6 km |
| Lewis & Clark | 19 MW | 62.2 km |
| Lonesome Creek Station | 363 MW | 76.6 km |