How many hydro power plants are in Oregon?

Oregon has 63 operating utility-scale hydro power plants with 8.4 GW of capacity, according to the EIA's monthly survey of power plants.

What is the largest hydro power plant in Oregon?

John Day in Sherman County, Oregon is the largest, at 2,160 MW. It came online in 1971.

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

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

Who is developing hydro power plants in Oregon?

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 Oregon

Oregon has 63 operating hydro power plants with 8.4 GW of capacity.

Operating63

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

Oregon had 61 hydro power plants online in 2016 and 63 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 Oregon

Operating, by capacity

#	Hydro power plant	County	Year online	Capacity
1	John Day	Sherman County	1971	2,160 MW
2	The Dalles	Wasco County	1973	1,820 MW
3	Bonneville	Multnomah County	1982	1,162 MW
4	McNary	Umatilla County	1957	991 MW
5	Hells Canyon	Wallowa County	1967	411 MW
6	Round Butte	Jefferson County	1964	373 MW
7	Oxbow (OR)	Baker County	1961	190 MW
8	Lookout Point	Lane County	1955	120 MW
9	Carmen Smith	Linn County	1963	114 MW
10	Pelton	Jefferson County	1958	110 MW

Hydro power plants that came online most recently in Oregon

Newest first

#	Hydro power plant	County	Year online	Capacity
1	Faraday	Clackamas County	2023	37 MW
2	Timothy Lake Powerhouse	Clackamas County	2018	1 MW
3	Copper Dam Plant	Hood River County	2015	3 MW
4	45 Mile Hydroelectric Project	Jefferson County	2015	3 MW
5	Dorena Hydro-Electric Facility	Lane County	2014	8 MW
6	C-Drop Hydro	Klamath County	2012	1 MW
7	Juniper Ridge Hydroelectric Project	Deschutes County	2010	5 MW
8	Stone Creek	Clackamas County	1994	12 MW
9	Tunnel 1 Power Project	Malheur County	1993	9 MW
10	Dalles Dam North Fishway Project	Wasco County	1991	7 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 Oregon

How many hydro power plants are in Oregon?: Oregon has 63 operating utility-scale hydro power plants with 8.4 GW of capacity, according to the EIA's monthly survey of power plants.
What is the largest hydro power plant in Oregon?: John Day in Sherman County, Oregon is the largest, at 2,160 MW. It came online in 1971.
How many hydro power plants were built in Oregon in 2025?: 0 hydro power plants came online in Oregon in 2025, with 0 MW of capacity.
Who is developing hydro power plants in Oregon?: 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.