Hermiston Power Partnership
Umatilla County, Oregon · EIA plant ID 55328 · Operator: Hermiston Power Partnership
Nameplate689MWSummer 629 MW
Generators3in service
Net generation3,522GWh12 mo to Aug 2026
Capacity factor64%gas/coal/oil units, summer MW
Heat rate7,186Btu/kWhfossil units, electric fuel, HHV
First online2002Runs 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) |
|---|---|---|---|
| 2003 | 2,563.7 | 47.6% | 6,922 |
| 2004 | 3,986.4 | 73.8% | 6,962 |
| 2005 | 3,570 | 66.3% | 7,057 |
| 2006 | 2,905.5 | 53.9% | 7,144 |
| 2007 | 3,078.1 | 57.1% | 7,216 |
| 2008 | 3,720.2 | 68.9% | 7,167 |
| 2009 | 3,466.4 | 64.3% | 7,149 |
| 2010 | 3,241.6 | 60.2% | 7,171 |
| 2011 | 1,155.9 | 21.5% | 7,352 |
| 2012 | 2,888.9 | 53.5% | 7,238 |
| 2013 | 3,655.7 | 67.9% | 7,195 |
| 2014 | 3,100.6 | 57.6% | 7,187 |
| 2015 | 330.7 | 6.1% | 7,159 |
| 2016 | 3,179.7 | 58.9% | 7,216 |
| 2017 | 2,970.8 | 55.1% | 7,259 |
| 2018 | 3,644.2 | 67.6% | 7,211 |
| 2019 | 4,298.3 | 79.8% | 7,230 |
| 2020 | 3,956.2 | 73.2% | 7,185 |
| 2021 | 4,341.1 | 80.6% | 7,181 |
| 2022 | 3,859.8 | 71.7% | 7,237 |
| 2023 | 3,918.1 | 71.1% | 7,180 |
| 2024 | 4,283.1 | 77.5% | 7,259 |
| 2025 | 2,989 | 54.3% | 7,247 |
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 |
|---|---|---|---|---|---|---|---|---|
| CTG1 | Natural Gas Fired Combined Cycle | CT | 212.5 | 197 | Aug 2002 | Operating | — | coming soon |
| CTG2 | Natural Gas Fired Combined Cycle | CT | 212.5 | 197 | Aug 2002 | Operating | — | coming soon |
| STG1 | Natural Gas Fired Combined Cycle | CA | 264.4 | 235 | Aug 2002 | Operating | — | coming soon |
Owner / operator
Operator: Hermiston Power Partnership. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Hermiston Power Partnership | 100.0% | 689 MW |
Nearby plants
Within 80 km.
| Hermiston Generating Plant | 621 MW | 4.5 km |
| Four Corners Windfarm LLC | 8 MW | 10.9 km |
| Oregon Trail Windfarm LLC | 10 MW | 11.5 km |
| Ward Butte Windfarm LLC | 7 MW | 13.2 km |
| Butter Creek Power LLC | 5 MW | 13.3 km |
| NorWest Energy 9 LLC | 6 MW | 13.9 km |