Hermiston Power Partnership
Natural gas power plant in Umatilla County, Oregon. 689.4 MW of nameplate capacity across 3 generators, operated by Hermiston Power Partnership.
Also known as Hermiston Power Projects · EIA plant 55328
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Key facts
- Capacity
- 689.4 MWNameplate
- Generators
- 3 operatingEIA-860M, August 2026
- Operating since
- August 2002First generator online
- Operator
- Hermiston Power PartnershipEIA operator ID 7869
- Grid
- GRIDBalancing authority GRID
- Price nodes
- None linkedNo verified ISO node
- Location
- Umatilla County, OR45.7940, −119.3133
- EIA plant ID
- 55328EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Hermiston Power Partnership produces
Free · EIA-923Net generation, 2025
2.99 TWh
2,988,998 MWh, final
Capacity factor, 2025
49.5%
2024: 70.7%
January to July 2026
1.85 TWh
Provisional
Range, 2016 to 2025
3.0–4.3
TWh a year. Low 2017, high 2021
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | 2,563,676 | Not reported | 12 of 12 |
| 2004 | 3,986,389 | Not reported | 12 of 12 |
| 2005 | 3,569,997 | Not reported | 12 of 12 |
| 2006 | 2,905,519 | Not reported | 12 of 12 |
| 2007 | 3,078,085 | Not reported | 12 of 12 |
| 2008 | 3,720,166 | Not reported | 12 of 12 |
| 2009 | 3,466,411 | Not reported | 12 of 12 |
| 2010 | 3,241,573 | 53.7% | 12 of 12 |
| 2011 | 1,155,919 | 19.1% | 12 of 12 |
| 2012 | 2,888,903 | 47.7% | 12 of 12 |
| 2013 | 3,655,689 | Not reported | 12 of 12 |
| 2014 | 3,100,584 | 51.3% | 12 of 12 |
| 2015 | 330,670 | 64.5% | 1 of 12 |
| 2016 | 3,179,734 | 52.5% | 12 of 12 |
| 2017 | 2,970,806 | 49.2% | 12 of 12 |
| 2018 | 3,644,236 | 60.3% | 12 of 12 |
| 2019 | 4,298,264 | 71.2% | 12 of 12 |
| 2020 | 3,956,218 | 65.3% | 12 of 12 |
| 2021 | 4,341,072 | 71.9% | 12 of 12 |
| 2022 | 3,859,811 | 63.9% | 12 of 12 |
| 2023 | 3,918,106 | 64.9% | 12 of 12 |
| 2024 | 4,283,080 | 70.7% | 12 of 12 |
| 2025 | 2,988,998 | 49.5% | 12 of 12 |
| 2026 (provisional, partial year) | 1,851,083 | 52.8% | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDCO₂, 2025
1.32M
US short tons. 2024: 1.88M
SO₂, 2025
7
US short tons
NOx, 2025
174
US short tons
CO₂ per MWh, calculated
0.44 t
About 883 lb per MWh
2 of 2 EPA units reported CO₂ in 2025 (CTG-1, CTG-2), matched to EIA plant 55328 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSWithdrawal, 2024
921
million gallons
Consumption, 2024
793
million gallons
Source
Municipal
Surface, Fresh. Induced-draft tower
Watershed stress
Moderate · 0.409
USGS SUI, HUC12 Umatilla River
12 of 12 cooling months report withdrawal. SUI of the HUC12 containing the plant. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| CTG1 | Natural Gas Fired Combined Cycle | 212.5 | August 2002 |
| CTG2 | Natural Gas Fired Combined Cycle | 212.5 | August 2002 |
| STG1 | Natural Gas Fired Combined Cycle | 264.4 | August 2002 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Hermiston Power Partnership as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Questions about Hermiston Power Partnership
How much power does Hermiston Power Partnership produce?
Hermiston Power Partnership reported 2,988,998 MWh (2.99 TWh) of net generation in 2025, a 49.5% capacity factor on 689.4 MW of nameplate capacity. From January to July 2026 it reported 1.85 TWh, which is provisional.
Where is Hermiston Power Partnership?
Hermiston Power Partnership is in Umatilla County, Oregon, at 45.7940, −119.3133. It is in the Gridforce Energy Management, LLC balancing area (GRID).
Who operates Hermiston Power Partnership?
EIA-860M for August 2026 lists Hermiston Power Partnership as the operator (EIA operator ID 7869). The operator is not always the owner.
When did Hermiston Power Partnership start operating?
Its first generator began operating in August 2002, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- EIA-923 cooling water 2024 and the USGS surface water supply and use index, Water years 2010-2020 (Oct 2009 to Sep 2020), mean of monthly values
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page