How many hydro power plants are in Washington?

Washington has 73 operating utility-scale hydro power plants with 22 GW of capacity, according to the EIA's monthly survey of power plants.

What is the largest hydro power plant in Washington?

Grand Coulee in Grant County, Washington is the largest, at 6,809 MW. It came online in 1984.

How many hydro power plants were built in Washington in 2025?

0 hydro power plants came online in Washington in 2025, with 0 MW of capacity.

Who is developing hydro power plants in Washington?

Interconnection queues list each project under a project company, not the developer behind it. Cleanview researches the developer of every project and has them on paid plans.

Hydro power plants in Washington

Washington has 73 operating hydro power plants with 22 GW of capacity.

Operating73

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

Washington had 70 hydro power plants online in 2016 and 73 in 2026

2016’162017’172018’182019’192020’202021’212022’222023’232024’242025’252026’26

Hydro power plants online at the end of each year. Source: EIA-860M, compiled by Cleanview.

The 10 largest hydro power plants in Washington

Operating, by capacity

#	Hydro power plant	County	Year online	Capacity
1	Grand Coulee	Grant County	1984	6,809 MW
2	Chief Joseph	Douglas County	1979	2,456 MW
3	Rocky Reach	Chelan County	1974	1,349 MW
4	Wanapum	Grant County	2020	1,220 MW
5	Boundary	Pend Oreille County	1986	1,160 MW
6	Priest Rapids	Grant County	1961	950 MW
7	Wells	Chelan County	1969	867 MW
8	Little Goose	Columbia County	1978	810 MW
9	Lower Monumental	Walla Walla County	1979	810 MW
10	Lower Granite	Whitman County	1978	810 MW

Hydro power plants that came online most recently in Washington

Newest first

#	Hydro power plant	County	Year online	Capacity
1	Wanapum	Grant County	2020	1,220 MW
2	Calligan Creek Hydroelectric Project	King County	2018	6 MW
3	Hancock Creek Hydroelectric Project	King County	2018	6 MW
4	Snoqualmie	King County	2013	13 MW
5	Lower Baker	Skagit County	2013	104 MW
6	Cushman 2	Mason County	2013	85 MW
7	Snoqualmie 2	King County	2013	39 MW
8	Youngs Creek Hydroelectric Project	Snohomish County	2011	8 MW
9	Tieton Dam Hydro Electric Project	Yakima County	2006	14 MW
10	Meyers Falls	Stevens County	2006	2 MW

The developer behind each project is on paid plans. See plans

How Cleanview tracks hydro power plants

Operating hydro power plants come from the EIA's monthly survey of power plants. Planned projects come from the grid operators' interconnection queues. We research who is developing each one, since a queue lists a project company, not its owner.

Questions about hydro power plants in Washington

How many hydro power plants are in Washington?: Washington has 73 operating utility-scale hydro power plants with 22 GW of capacity, according to the EIA's monthly survey of power plants.
What is the largest hydro power plant in Washington?: Grand Coulee in Grant County, Washington is the largest, at 6,809 MW. It came online in 1984.
How many hydro power plants were built in Washington in 2025?: 0 hydro power plants came online in Washington in 2025, with 0 MW of capacity.
Who is developing hydro power plants in Washington?: Interconnection queues list each project under a project company, not the developer behind it. Cleanview researches the developer of every project and has them on paid plans.