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621.2 MW Natural Gas operating in Umatilla, OR
621.2 MW
Nameplate Capacity
4
Generators
units
Natural Gas Fired Combined Cycle
Technology
1996
Operating Since
Coordinates
45.8042, -119.3700
County
Umatilla, OR
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Hermiston Generating Co LP | Hermiston Generating Company | — |
| Owner(s) | Hermiston Generating Co LP, PacifiCorp | Sumitomo | — |
| Status | Operating | — | — |
Hermiston Generating Plant is a 621.2 MW natural gas-fired combined cycle power plant located in Umatilla County, Oregon. The plant began operating in 1996 and consists of 4 generators. It is owned by Sumitomo, a company based in Japan, and operated by Hermiston Generating Co LP. The plant is interconnected to the PacifiCorp - West balancing authority within the Western Electricity Coordinating Council (WECC) NERC region.
In the most recent year of data, Hermiston Generating Plant produced 2,997,886 MWh of electricity, operating at a capacity factor of 55.2%. According to available data, the plant ranks as the second largest of 10 power plants in Oregon and 379th out of 945 plants nationally. Financial data indicates an installed cost of $633.18 per kW, based on information reported to FERC.
Generated from EIA, GEM, and public data sources
Grid Region
Pacific Northwest
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
PacifiCorp - West (PACW)
Grid Voltage
230.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP CHP
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
163.1K MWh
Latest Month
3.0M MWh
Annual Generation
55.2%
Capacity Factor
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CO₂ Intensity
876 lb/MWh
NOx
0.105 lb/MWh
SO₂
0.004 lb/MWh
CH₄
0.017 lb/MWh
N₂O
0.002 lb/MWh
Capacity Factor
54.9%
Annual Net Gen
2990 GWh
CO₂eq
877 lb/MWh
Subregion
WECC Northwest
Combined cycle · PacifiCorp · Data from 2015–2023
$671/kW
Installed Cost
$5/kW
Annual CapEx
$30.8/MWh
Operating Cost
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
Forward revenue, DSCR bands, and refinancing risk projected under price, demand, and policy scenarios. Powered by InfraSure's asset cashflow stack.
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This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-26
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