How many hydro power plants are in PJM?

PJM has 84 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 PJM?

Bath County in Bath County, Virginia is the largest, at 2,862 MW. It came online in 1985.

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

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

Who is developing hydro power plants in PJM?

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 PJM

PJM has 84 operating hydro power plants with 8.4 GW of capacity.

Operating84

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

PJM had 81 hydro power plants online in 2016 and 84 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 PJM

Operating, by capacity

#	Hydro power plant	Location	Year online	Capacity
1	Bath County	Bath County, Virginia	1985	2,862 MW
2	Muddy Run	Lancaster County, Pennsylvania	1968	1,072 MW
3	Smith Mountain	Pittsylvania County, Virginia	1980	548 MW
4	Conowingo	Harford County, Maryland	1964	531 MW
5	Yards Creek Energy	Warren County, New Jersey	1965	453 MW
6	Seneca Generation LLC	Warren County, Pennsylvania	1970	438 MW
7	Safe Harbor	Lancaster County, Pennsylvania	1986	418 MW
8	John H Kerr	Mecklenburg County, Virginia	2008	297 MW
9	Holtwood	Lancaster County, Pennsylvania	2013	247 MW
10	Gaston	Halifax County, North Carolina	1963	178 MW

Hydro power plants that came online most recently in PJM

Newest first

#	Hydro power plant	Location	Year online	Capacity
1	Notre Dame Hydro	St Joseph County, Indiana	2022	3 MW
2	Matilda Hamilton Fee Hydroelectric Stati	Estill County, Kentucky	2021	3 MW
3	Pinnacles	Patrick County, Virginia	2021	12 MW
4	Meldahl Hydroelectric Project	Bracken County, Kentucky	2016	105 MW
5	Willow Island Hydroelectric Plant	Pleasants County, West Virginia	2016	44 MW
6	Mahoning Creek Hydroelectric Project	Armstrong County, Pennsylvania	2013	6 MW
7	Holtwood	Lancaster County, Pennsylvania	2013	247 MW
8	John H Kerr	Mecklenburg County, Virginia	2008	297 MW
9	Mother Ann Lee	Mercer County, Kentucky	2008	2 MW
10	Auglaize Hydro	Defiance County, Ohio	2004	4 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 PJM

How many hydro power plants are in PJM?: PJM has 84 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 PJM?: Bath County in Bath County, Virginia is the largest, at 2,862 MW. It came online in 1985.
How many hydro power plants were built in PJM in 2025?: 0 hydro power plants came online in PJM in 2025, with 0 MW of capacity.
Who is developing hydro power plants in PJM?: 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.