How many hydro power plants are in Idaho?

Idaho has 76 operating utility-scale hydro power plants with 2.7 GW of capacity, according to the EIA's monthly survey of power plants.

What is the largest hydro power plant in Idaho?

Brownlee in Washington County, Idaho is the largest, at 675 MW. It came online in 1980.

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

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

Who is developing hydro power plants in Idaho?

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 Idaho

Idaho has 76 operating hydro power plants with 2.7 GW of capacity.

Operating76

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

Idaho had 74 hydro power plants online in 2016 and 76 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 Idaho

Operating, by capacity

#	Hydro power plant	County	Year online	Capacity
1	Brownlee	Washington County	1980	675 MW
2	Dworshak	Clearwater County	1975	465 MW
3	Cabinet Gorge	Bonner County	1953	265 MW
4	Palisades Dam	Bonneville County	1958	176 MW
5	Lucky Peak Power Plant Project	Ada County	1988	101 MW
6	American Falls	Power County	1978	92 MW
7	C J Strike	Owyhee County	1952	83 MW
8	Bliss (ID)	Gooding County	1950	75 MW
9	Lower Salmon	Gooding County	1949	60 MW
10	Milner Hydro	Cassia County	1992	60 MW

Hydro power plants that came online most recently in Idaho

Newest first

#	Hydro power plant	County	Year online	Capacity
1	MC6 Hydro Facility	Ada County	2021	2 MW
2	Shoshone Falls	Jerome County	2020	15 MW
3	North Gooding Main Hydro	Gooding County	2016	1 MW
4	AJMS, LLC	Lincoln County	2015	1 MW
5	Head of U Canal Hydro Project	Jerome County	2015	1 MW
6	Chester Diversion Hydroelectric Project	Fremont County	2014	4 MW
7	Fargo Drop	Canyon County	2013	1 MW
8	Arrowrock Hydroelectric Project	Elmore County	2010	15 MW
9	Mora Drop Hydroelectric Project	Ada County	2006	2 MW
10	Boise R Diversion	Ada County	2004	3 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 Idaho

How many hydro power plants are in Idaho?: Idaho has 76 operating utility-scale hydro power plants with 2.7 GW of capacity, according to the EIA's monthly survey of power plants.
What is the largest hydro power plant in Idaho?: Brownlee in Washington County, Idaho is the largest, at 675 MW. It came online in 1980.
How many hydro power plants were built in Idaho in 2025?: 0 hydro power plants came online in Idaho in 2025, with 0 MW of capacity.
Who is developing hydro power plants in Idaho?: 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.