Power plants in the PacifiCorp West balancing area

The PacifiCorp West balancing area takes in 117 power plants with 2,741 MW of nameplate capacity, the 35th-largest of the 40 areas covered here. Its plants sit in three states, with Oregon holding 68% of the capacity. Hydroelectric makes up 35% of the mix, and the largest plant is Hermiston Generating Plant (621 MW). Since 2020, 241 MW has come online here, 88% of it solar.

Hydroelectric969 MW35%
Natural gas626 MW23%
Solar496 MW18%
Wind490 MW18%
Biomass and waste156 MW5.7%
Geothermal3.7 MW0.1%

Capacity by decade it came online

Natural gasHydroelectricWindSolarGeothermalBiomass and waste

Above the line: capacity operating in 2025. Below: capacity retired at plants that still run.

The 25 largest plants in the area

Rank	Plant	State	Runs on	Capacity	First unit
1	Hermiston Generating Plant	Oregon	Natural gas	621 MW	1996
2	Swift 1	Washington	Hydroelectric	240 MW	1958
3	Marengo Wind Plant	Washington	Wind	234 MW	2007
4	Merwin	Washington	Hydroelectric	136 MW	1931
5	Yale	Washington	Hydroelectric	134 MW	1953
6	Vansycle II Wind Energy Center	Oregon	Wind	102 MW	2009
7	Swift 2	Washington	Hydroelectric	72 MW	1958
8	Millican Solar Energy LLC	Oregon	Solar	70 MW	2021
9	Skysol	Oregon	Solar	61.2 MW	2023
10	Solar Star Oregon II	Oregon	Solar	56.3 MW	2017
11	Dillard Complex	Oregon	Biomass and waste	51.5 MW	1955
12	Lost Creek	Oregon	Hydroelectric	49 MW	1977
13	Airport Solar	Oregon	Solar	47.3 MW	2019
14	Lemolo 2	Oregon	Hydroelectric	43.7 MW	1956
15	Combine Hills I	Oregon	Wind	43 MW	2003
16	Toketee Falls	Oregon	Hydroelectric	42.6 MW	1949
17	Biomass One LP	Oregon	Biomass and waste	40 MW	1985
18	Prineville Solar Energy LLC	Oregon	Solar	40 MW	2021
19	Lemolo 1	Oregon	Hydroelectric	32 MW	1955
20	Prospect 2	Oregon	Hydroelectric	32 MW	1928
21	Clearwater 2	Oregon	Hydroelectric	26 MW	1953
22	Evergreen BioPower LLC	Oregon	Biomass and waste	21 MW	2007
23	Warm Springs Power Enterprises	Oregon	Hydroelectric	19.6 MW	1982
24	Slide Creek	Oregon	Hydroelectric	18 MW	1951
25	Clearwater 1	Oregon	Hydroelectric	15 MW	1953

States

State	Plants	Capacity
Oregon	101	1,876 MW
Washington	8	833 MW
California	8	32.2 MW

Operators with the most capacity

Operator	Plants	Capacity
PacifiCorp	23	1,072 MW
Hermiston Generating Co LP	1	621 MW
Invenergy Services LLC	2	110 MW
FPL Energy Stateline II Inc	1	102 MW
Skysol Holdco LLC	1	61.2 MW
Heelstone Energy Holdings, LLC	6	57.8 MW
Avangrid Power LLC	1	56.3 MW
Roseburg Forest Products Co	1	51.5 MW
USACE Northwestern Division	1	49 MW
Airport Solar LLC	1	47.3 MW