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
NERC Region
WECC
Balancing Authority
PacifiCorp - West
Grid Voltage
230 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP CHP
163.1K MWh
Latest Month
3.0M MWh
Annual Generation
55.2%
Capacity Factor
$671/kW
Installed Cost
$30.8/MWh
Operating Cost
PacifiCorp
Reporting Utility
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
Last updated 2026-03-26
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