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621.2 MW Natural Gas operating in Umatilla, OR — PacifiCorp - West
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
| 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
163.1K MWh
Latest Month
3.0M MWh
Annual Generation
55.2%
Capacity Factor
CO₂ Intensity
876 lb/MWh
NOx
0.105 lb/MWh
SO₂
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
This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
Last updated 2026-03-26
View all articlesNo ask pi reports yet for this entity.
ask pi about Hermiston Generating PlantPacifiCorp - West (PACW)
Grid Voltage
230.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP CHP
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