Power plants in the Bonneville Power Administration balancing area

The Bonneville Power Administration balancing area takes in 129 power plants with 30.5 GW of nameplate capacity, the 12th-largest of the 40 areas covered here. Its plants sit in five states, with Washington holding 63% of the capacity. Hydroelectric makes up 71% of the mix, and the largest plant is Grand Coulee (6,809 MW). Since 2020, 791 MW has come online here, 66% of it wind.

Hydroelectric21,685 MW71%
Wind3,817 MW13%
Natural gas2,178 MW7.1%
Nuclear1,200 MW3.9%
Coal730 MW2.4%
Pumped-storage hydro314 MW1.0%
Biomass and waste310 MW1.0%
Solar224 MW0.7%
Battery storage32 MW0.1%
Geothermal16 MW0.1%
Oil and petroleum6.6 MW0.0%

Capacity by decade it came online

NuclearCoalNatural gasOil and petroleumHydroelectricPumped-storage hydroWindSolarBattery storageGeothermalBiomass 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	Grand Coulee	Washington	Hydroelectric	6,809 MW	1941
2	Chief Joseph	Washington	Hydroelectric	2,456 MW	1955
3	John Day	Oregon	Hydroelectric	2,160 MW	1968
4	The Dalles	Oregon	Hydroelectric	1,820 MW	1957
5	Columbia Generating Station	Washington	Nuclear	1,200 MW	1984
6	Bonneville	Oregon	Hydroelectric	1,162 MW	1938
7	McNary	Oregon	Hydroelectric	990 MW	1953
8	Priest Rapids	Washington	Hydroelectric	950 MW	1959
9	Little Goose	Washington	Hydroelectric	810 MW	1970
10	Lower Granite	Washington	Hydroelectric	810 MW	1975
11	Lower Monumental	Washington	Hydroelectric	810 MW	1969
12	Transalta Centralia Generation	Washington	Coal	730 MW	1973
13	Grays Harbor Energy Facility	Washington	Natural gas	715 MW	2008
14	Ice Harbor	Washington	Hydroelectric	603 MW	1962
15	Chehalis Generating Facility	Washington	Natural gas	593 MW	2003
16	Libby	Montana	Hydroelectric	525 MW	1975
17	Dworshak	Idaho	Hydroelectric	465 MW	1974
18	Hungry Horse	Montana	Hydroelectric	428 MW	1952
19	Lower Snake River Wind Energy Project	Washington	Wind	343 MW	2012
20	Frederickson Power LP	Washington	Natural gas	318 MW	2002
21	Horseshoe Bend Wind LLC	Oregon	Wind	290 MW	2012
22	South Hurlburt Wind LLC	Oregon	Wind	290 MW	2012
23	Coyote Springs II	Oregon	Natural gas	287 MW	2003
24	Wheatridge Hybrid	Oregon	Wind	280 MW	2020
25	North Hurlburt Wind LLC	Oregon	Wind	265 MW	2012

States

State	Plants	Capacity
Washington	51	19.3 GW
Oregon	59	9,336 MW
Montana	4	959 MW
Idaho	13	894 MW
Wyoming	2	3.2 MW

Operators with the most capacity

Operator	Plants	Capacity
USACE Northwestern Division	20	13.1 GW
U S Bureau of Reclamation	9	7,533 MW
Energy Northwest- Columbia	1	1,200 MW
PUD No 2 of Grant County (WA)	1	950 MW
Shepherds Flat Wind LLC	3	845 MW
PacifiCorp	3	807 MW
Invenergy Services LLC	2	787 MW
TransAlta Centralia Gen LLC	2	731 MW
Puget Sound Energy Inc	2	499 MW
Frederickson Power LP	1	318 MW