How many hydro power plants are in Pennsylvania?

Pennsylvania has 19 operating utility-scale hydro power plants with 2.4 GW of capacity, according to the EIA's monthly survey of power plants.

What is the largest hydro power plant in Pennsylvania?

Muddy Run in Lancaster County, Pennsylvania is the largest, at 1,072 MW. It came online in 1968.

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

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

Who is developing hydro power plants in Pennsylvania?

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 Pennsylvania

Pennsylvania has 19 operating hydro power plants with 2.4 GW of capacity.

Operating19

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

Pennsylvania had 19 hydro power plants online in 2016 and 19 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 Pennsylvania

Operating, by capacity

#	Hydro power plant	County	Year online	Capacity
1	Muddy Run	Lancaster County	1968	1,072 MW
2	Seneca Generation LLC	Warren County	1970	438 MW
3	Safe Harbor	Lancaster County	1986	418 MW
4	Holtwood	Lancaster County	2013	247 MW
5	Lake Lynn Hydro Station	Fayette County	1929	51 MW
6	Wallenpaupack	Wayne County	1926	40 MW
7	Piney	Clarion County	1928	30 MW
8	William F Matson Generating Station	Huntingdon County	1988	22 MW
9	York Haven	York County	1905	20 MW
10	Allegheny Hydro No 9	Armstrong County	1990	18 MW

Hydro power plants that came online most recently in Pennsylvania

Newest first

#	Hydro power plant	County	Year online	Capacity
1	Mahoning Creek Hydroelectric Project	Armstrong County	2013	6 MW
2	Holtwood	Lancaster County	2013	247 MW
3	Allegheny Hydro No 9	Armstrong County	1990	18 MW
4	Allegheny Hydro No 8	Armstrong County	1990	14 MW
5	Yough Hydro Power	Somerset County	1989	12 MW
6	Conemaugh Hydro Plant	Westmoreland County	1989	15 MW
7	Allegheny No 6 Hydro Station	Armstrong County	1988	9 MW
8	Allegheny No. 5 Hydro Station	Armstrong County	1988	9 MW
9	William F Matson Generating Station	Huntingdon County	1988	22 MW
10	Townsend Hydro	Beaver County	1987	5 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 Pennsylvania

How many hydro power plants are in Pennsylvania?: Pennsylvania has 19 operating utility-scale hydro power plants with 2.4 GW of capacity, according to the EIA's monthly survey of power plants.
What is the largest hydro power plant in Pennsylvania?: Muddy Run in Lancaster County, Pennsylvania is the largest, at 1,072 MW. It came online in 1968.
How many hydro power plants were built in Pennsylvania in 2025?: 0 hydro power plants came online in Pennsylvania in 2025, with 0 MW of capacity.
Who is developing hydro power plants in Pennsylvania?: 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.