How many hydro power plants are in SPP?

SPP has 24 operating utility-scale hydro power plants with 3.4 GW of capacity, according to the EIA's monthly survey of power plants.

What is the largest hydro power plant in SPP?

Oahe in Hughes County, South Dakota is the largest, at 786 MW. It came online in 1963.

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

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

Who is developing hydro power plants in SPP?

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 SPP

SPP has 24 operating hydro power plants with 3.4 GW of capacity.

Operating24

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

SPP had 24 hydro power plants online in 2016 and 24 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 SPP

Operating, by capacity

#	Hydro power plant	Location	Year online	Capacity
1	Oahe	Hughes County, South Dakota	1963	786 MW
2	Garrison	Mercer County, North Dakota	1960	583 MW
3	Big Bend Dam	Buffalo County, South Dakota	1966	538 MW
4	Fort Randall	Charles Mix County, South Dakota	1956	320 MW
5	Salina	Mayes County, Oklahoma	1971	259 MW
6	Gavins Point	Cedar County, Nebraska	1957	132 MW
7	Pensacola	Mayes County, Oklahoma	1946	130 MW
8	Markham	Mayes County, Oklahoma	1964	128 MW
9	Broken Bow Dam	McCurtain County, Oklahoma	1970	100 MW
10	Keystone Dam	Tulsa County, Oklahoma	1968	70 MW

Hydro power plants that came online most recently in SPP

Newest first

#	Hydro power plant	Location	Year online	Capacity
1	Kansas River Project	Douglas County, Kansas	2012	7 MW
2	Kaw Hydro	Kay County, Oklahoma	1989	37 MW
3	Ellis Hydro	Crawford County, Arkansas	1988	32 MW
4	Kingsley	Keith County, Nebraska	1984	50 MW
5	Salina	Mayes County, Oklahoma	1971	259 MW
6	Broken Bow Dam	McCurtain County, Oklahoma	1970	100 MW
7	Narrows (AR)	Pike County, Arkansas	1969	26 MW
8	Keystone Dam	Tulsa County, Oklahoma	1968	70 MW
9	Big Bend Dam	Buffalo County, South Dakota	1966	538 MW
10	Markham	Mayes County, Oklahoma	1964	128 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 SPP

How many hydro power plants are in SPP?: SPP has 24 operating utility-scale hydro power plants with 3.4 GW of capacity, according to the EIA's monthly survey of power plants.
What is the largest hydro power plant in SPP?: Oahe in Hughes County, South Dakota is the largest, at 786 MW. It came online in 1963.
How many hydro power plants were built in SPP in 2025?: 0 hydro power plants came online in SPP in 2025, with 0 MW of capacity.
Who is developing hydro power plants in SPP?: 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.