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Grand Coulee

Hydro power plant · Grant County, Washington

Nameplate capacity

6,809 MW

Rank in Washington

of 139 plants

In service since

1941

March 1941

Details

Primary fuel: Hydro
Technology: Conventional Hydroelectric
Operator: U S Bureau of Reclamation
County: Grant County
Generating units: 33
Share of state capacity: 21.47%
Rank among hydro plants in Washington: #1 of 73
EIA plant code: 6163

Generating units

Individual generating units at Grand Coulee
Unit	Technology	Nameplate	Summer	Online	Status
22	Conventional Hydroelectric	805 MW	805 MW	1978	Operating
23	Conventional Hydroelectric	805 MW	805 MW	1979	Operating
24	Conventional Hydroelectric	805 MW	805 MW	1980	Operating
19	Conventional Hydroelectric	600 MW	690 MW	1975	Operating
20	Conventional Hydroelectric	600 MW	690 MW	1976	Operating
21	Conventional Hydroelectric	600 MW	690 MW	1976	Operating
1	Conventional Hydroelectric	125 MW	125 MW	1942	Operating
10	Conventional Hydroelectric	125 MW	125 MW	1951	Operating
11	Conventional Hydroelectric	125 MW	125 MW	1951	Operating
12	Conventional Hydroelectric	125 MW	125 MW	1951	Operating
13	Conventional Hydroelectric	125 MW	125 MW	1950	Operating
14	Conventional Hydroelectric	125 MW	125 MW	1950	Operating
15	Conventional Hydroelectric	125 MW	125 MW	1950	Operating
16	Conventional Hydroelectric	125 MW	125 MW	1949	Operating
17	Conventional Hydroelectric	125 MW	125 MW	1949	Operating
18	Conventional Hydroelectric	125 MW	125 MW	1949	Operating
2	Conventional Hydroelectric	125 MW	125 MW	1942	Operating
3	Conventional Hydroelectric	125 MW	125 MW	1941	Operating
4	Conventional Hydroelectric	125 MW	125 MW	1944	Operating
5	Conventional Hydroelectric	125 MW	125 MW	1943	Operating
6	Conventional Hydroelectric	125 MW	125 MW	1943	Operating
7	Conventional Hydroelectric	125 MW	125 MW	1947	Operating
8	Conventional Hydroelectric	125 MW	125 MW	1943	Operating
9	Conventional Hydroelectric	125 MW	125 MW	1948	Operating
PG10	Hydroelectric Pumped Storage	54 MW	54 MW	1983	Operating
PG11	Hydroelectric Pumped Storage	54 MW	54 MW	1983	Operating
PG12	Hydroelectric Pumped Storage	54 MW	54 MW	1984	Operating
PG9	Hydroelectric Pumped Storage	54 MW	54 MW	1983	Operating
PG7	Hydroelectric Pumped Storage	50 MW	50 MW	1973	Operating
PG8	Hydroelectric Pumped Storage	50 MW	50 MW	1973	Operating
LS1	Conventional Hydroelectric	10 MW	10 MW	1941	Operating
LS2	Conventional Hydroelectric	10 MW	10 MW	1941	Operating
LS3	Conventional Hydroelectric	10 MW	10 MW	1951	Operating

Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.

Similarly sized plants in Washington

Chief Joseph	Hydro	2,456 MW
Rocky Reach	Hydro	1,349 MW

About this data

From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 6,809 MW solar plant and a 6,809 MW nuclear plant have the same entry here and produce very different amounts of electricity.

“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Washington power plants · What Washington actually generates