How many hydro power plants are in NYISO?

NYISO has 165 operating utility-scale hydro power plants with 5.9 GW of capacity, according to the EIA's monthly survey of power plants.

What is the largest hydro power plant in NYISO?

Robert Moses Niagara in Niagara County, New York is the largest, at 2,429 MW. It came online in 1962.

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

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

Who is developing hydro power plants in NYISO?

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 NYISO

NYISO has 165 operating hydro power plants with 5.9 GW of capacity.

Operating165

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

NYISO had 164 hydro power plants online in 2016 and 165 in 2026

164

165

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 NYISO

Operating, by capacity

#	Hydro power plant	Location	Year online	Capacity
1	Robert Moses Niagara	Niagara County, New York	1962	2,429 MW
2	Blenheim Gilboa	Schoharie County, New York	1973	1,000 MW
3	Robert Moses Power Dam	St Lawrence County, New York	1959	912 MW
4	Lewiston Niagara	Niagara County, New York	1962	240 MW
5	Curtis Palmer Hydroelectric	Saratoga County, New York	1986	59 MW
6	Spier Falls	Saratoga County, New York	1930	56 MW
7	Hudson Falls Hydroelectric Project	Saratoga County, New York	1995	44 MW
8	Rochester 5	Monroe County, New York	1927	44 MW
9	School Street	Albany County, New York	1924	39 MW
10	Stewarts Bridge	Saratoga County, New York	2013	39 MW

Hydro power plants that came online most recently in NYISO

Newest first

#	Hydro power plant	Location	Year online	Capacity
1	Swinging Bridge 2	Sullivan County, New York	2019	8 MW
2	Rio	Sullivan County, New York	2013	11 MW
3	Stewarts Bridge	Saratoga County, New York	2013	39 MW
4	Stuyvesant Falls	Columbia County, New York	2012	6 MW
5	Mechanicville Hydroelectric Station	Saratoga County, New York	2011	4 MW
6	Sherman Island	Saratoga County, New York	2009	36 MW
7	Oswego Falls West	Oswego County, New York	2008	3 MW
8	Higley	St Lawrence County, New York	2003	6 MW
9	Oswegatchie	St Lawrence County, New York	2002	2 MW
10	Glen Park Hydroelectric Project	Jefferson County, New York	1999	33 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 NYISO

How many hydro power plants are in NYISO?: NYISO has 165 operating utility-scale hydro power plants with 5.9 GW of capacity, according to the EIA's monthly survey of power plants.
What is the largest hydro power plant in NYISO?: Robert Moses Niagara in Niagara County, New York is the largest, at 2,429 MW. It came online in 1962.
How many hydro power plants were built in NYISO in 2025?: 0 hydro power plants came online in NYISO in 2025, with 0 MW of capacity.
Who is developing hydro power plants in NYISO?: 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.