Hermiston Generating Plant
Umatilla County, Oregon · EIA plant ID 54761 · Operator: Hermiston Generating Co LP
Nameplate621MWSummer 464 MW
Generators4in service
Net generation2,937GWh12 mo to Aug 2026
Capacity factor72%gas/coal/oil units, summer MW
Heat rate7,544Btu/kWhfossil units, electric fuel, HHV
First online1996Runs as baseload
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), gas/coal/oil 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.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 3,926.7 | — | — |
| 2002 | 3,264.2 | — | — |
| 2003 | 2,527.6 | 61.4% | 9,887 |
| 2004 | 3,686.3 | 90.4% | 7,305 |
| 2005 | 3,535.6 | 87.0% | 7,470 |
| 2006 | 3,069.3 | 75.5% | 7,350 |
| 2007 | 3,417.9 | 84.1% | 7,613 |
| 2008 | 3,613.9 | 88.7% | 7,269 |
| 2009 | 3,098.1 | 76.2% | 7,388 |
| 2010 | 3,193.8 | 78.6% | 7,400 |
| 2011 | 2,309.5 | 56.8% | 7,541 |
| 2012 | 2,285.9 | 56.1% | 7,616 |
| 2013 | 2,575.5 | 63.4% | 7,787 |
| 2014 | 2,315.1 | 57.0% | 7,708 |
| 2015 | 2,387.2 | 58.7% | 7,662 |
| 2016 | 1,956.3 | 48.0% | 7,542 |
| 2017 | 1,768.1 | 43.5% | 7,586 |
| 2018 | 2,493.6 | 61.4% | 7,472 |
| 2019 | 2,862.6 | 70.4% | 7,402 |
| 2020 | 2,343.9 | 57.5% | 7,443 |
| 2021 | 2,823 | 69.5% | 7,407 |
| 2022 | 2,472.1 | 60.8% | 7,492 |
| 2023 | 2,989.5 | 73.6% | 7,516 |
| 2024 | 3,345.7 | 82.1% | 7,555 |
| 2025 | 2,997.9 | 73.8% | 7,557 |
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 |
|---|---|---|---|---|---|---|---|---|
| GEN1 | Natural Gas Fired Combined Cycle | CA | 106.1 | 80 | Jun 1996 | Operating | — | coming soon |
| GEN2 | Natural Gas Fired Combined Cycle | CT | 204.5 | 152 | Jun 1996 | Operating | — | coming soon |
| GEN3 | Natural Gas Fired Combined Cycle | CA | 106.1 | 80 | Jun 1996 | Operating | — | coming soon |
| GEN4 | Natural Gas Fired Combined Cycle | CT | 204.5 | 152 | Jun 1996 | Operating | — | coming soon |
Owner / operator
Operator: Hermiston Generating Co LP. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| PacifiCorp | 50.0% | 311 MW |
| Hermiston Generating Co LP | 50.0% | 311 MW |
Nearby plants
Within 80 km.
| Hermiston Power Partnership | 689 MW | 4.5 km |
| Four Corners Windfarm LLC | 8 MW | 9.2 km |
| Oregon Trail Windfarm LLC | 10 MW | 10.6 km |
| Butter Creek Power LLC | 5 MW | 12.1 km |
| Ward Butte Windfarm LLC | 7 MW | 12.3 km |
| NorWest Energy 9 LLC | 6 MW | 12.7 km |