How many hydroelectric power plants are in Pennsylvania?

17, with 920 MW of nameplate capacity between them, spread over 10 counties. That is the EIA-860M operating count for 2026-07.

Is there a map of Pennsylvania hydroelectric power plants?

Yes — the map above. Each dot is one hydroelectric power plant, sized by nameplate capacity and placed at the coordinates EIA files for it.

Which is the largest hydroelectric power plant in Pennsylvania?

Safe Harbor, at 418 MW. The table is sorted largest first, so the rest follow it.

Is there a hydroelectric power plant near me in Pennsylvania?

The county roll-up below groups every plant by county, which is the quickest way to find the one closest to a given town.

Which grid operator runs Pennsylvania's hydroelectric power plants?

Most of them sit inside PJM, according to the balancing-authority code EIA files against each plant. Live conditions for that market are on this site.

How current is this, and what is left out?

EIA-860M for 2026-07. Conventional hydroelectric. Pumped storage is counted separately. Plants below 1 MW are not surveyed by EIA and so are absent; retirements and additions after 2026-07 arrive with the next monthly release.

Hydroelectric Power Plants in Pennsylvania

Every operating hydroelectric power plant in Pennsylvania on EIA-860M for 2026-07: 17 plants, 62 generating units and 920 MW of nameplate capacity across 10 counties, most of it inside PJM.

As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m

Plants: 17; 62 generating units
Nameplate capacity: 920 MW
Counties: 10
Grid operator: PJM; covers most of these plants

Map of hydroelectric power plants in Pennsylvania

Every one of the 17 plants is drawn at the coordinate EIA files for it.

Loading map…

Hydro · 17

List of hydroelectric power plants in Pennsylvania

Sort by any column. Capacity is nameplate, summed across every generating unit EIA lists at the site.

hydroelectric power plants in Pennsylvania

Safe HarborConventional Hydroelectric	Safe Harbor	Lancaster	417.5	14	1931	Operating
HoltwoodConventional Hydroelectric	BIF III Holtwood LLC	Lancaster	247.3	14	1910	Operating
Lake Lynn Hydro StationConventional Hydroelectric	Eagle Creek Renewable Energy, LLC	Fayette	51.2	4	1926	Operating
WallenpaupackConventional Hydroelectric	Wallenpuapack Hydro	Wayne	40	2	1926	Operating
PineyConventional Hydroelectric	BP Piney & Deep Creek LLC	Clarion	30	3	1924	Operating
William F Matson Generating StationConventional Hydroelectric	Allegheny Electric Coop Inc	Huntingdon	21.7	2	1988	Operating
York HavenConventional Hydroelectric	Eagle Creek Renewable Energy, LLC	York	19.6	1	1905	Operating
Allegheny Hydro No 9Conventional Hydroelectric	Allegheny Hydro LP	Armstrong	17.8	2	1990	Operating
Conemaugh Hydro PlantConventional Hydroelectric	Pennsylvania Renewable Resources	Westmoreland	15	2	1989	Operating
Allegheny Hydro No 8Conventional Hydroelectric	Allegheny Hydro LP	Armstrong	13.6	2	1990	Operating
Yough Hydro PowerConventional Hydroelectric	D/R Hydro Co	Somerset	12.2	2	1989	Operating
Allegheny No. 5 Hydro StationConventional Hydroelectric	Eagle Creek Renewable Energy, LLC	Armstrong	9.2	2	1988	Operating
Allegheny No 6 Hydro StationConventional Hydroelectric	Eagle Creek Renewable Energy, LLC	Armstrong	9.2	2	1988	Operating
Mahoning Creek Hydroelectric ProjectConventional Hydroelectric	Eagle Creek Renewable Energy, LLC	Armstrong	6	1	2013	Operating
Townsend HydroConventional Hydroelectric	Beaver Falls Municipal Auth - (PA)	Beaver	5.2	2	1987	Operating
Warrior Ridge HydroConventional Hydroelectric	American Hydro Power Company	Huntingdon	2.8	4	1985	Out of service but expected to return to service in next calendar year
Beaver Valley Patterson DamConventional Hydroelectric	Central Rivers Power US, LLC	Beaver	1.2	3	1982	Operating

Largest hydroelectric power plants in Pennsylvania

1Safe HarborLancaster County, Pennsylvania417.5 MW
2HoltwoodLancaster County, Pennsylvania247.3 MW
3Lake Lynn Hydro StationFayette County, Pennsylvania51.2 MW
4WallenpaupackWayne County, Pennsylvania40 MW
5PineyClarion County, Pennsylvania30 MW
6William F Matson Generating StationHuntingdon County, Pennsylvania21.7 MW
7York HavenYork County, Pennsylvania19.6 MW
8Allegheny Hydro No 9Armstrong County, Pennsylvania17.8 MW
9Conemaugh Hydro PlantWestmoreland County, Pennsylvania15 MW
10Allegheny Hydro No 8Armstrong County, Pennsylvania13.6 MW

Hydroelectric power plants by county in Pennsylvania

The county EIA files against each plant. It is the fastest way to find the plant nearest a given town.

County	Plants	Nameplate MW
Lancaster	2	664.8
Armstrong	5	55.8
Fayette	1	51.2
Wayne	1	40
Clarion	1	30
Huntingdon	2	24.5
York	1	19.6
Westmoreland	1	15
Somerset	1	12.2
Beaver	2	6.4

Hydroelectric Power Plants in Pennsylvania: FAQ

How many hydroelectric power plants are in Pennsylvania?: 17, with 920 MW of nameplate capacity between them, spread over 10 counties. That is the EIA-860M operating count for 2026-07.
Is there a map of Pennsylvania hydroelectric power plants?: Yes — the map above. Each dot is one hydroelectric power plant, sized by nameplate capacity and placed at the coordinates EIA files for it.
Which is the largest hydroelectric power plant in Pennsylvania?: Safe Harbor, at 418 MW. The table is sorted largest first, so the rest follow it.
Is there a hydroelectric power plant near me in Pennsylvania?: The county roll-up below groups every plant by county, which is the quickest way to find the one closest to a given town.
Which grid operator runs Pennsylvania's hydroelectric power plants?: Most of them sit inside PJM, according to the balancing-authority code EIA files against each plant. Live conditions for that market are on this site.
How current is this, and what is left out?: EIA-860M for 2026-07. Conventional hydroelectric. Pumped storage is counted separately. Plants below 1 MW are not surveyed by EIA and so are absent; retirements and additions after 2026-07 arrive with the next monthly release.