Power plants in Armstrong County, Pennsylvania
7 operating power plants in Armstrong County, Pennsylvania, with 2,616 MW of nameplate capacity, largest first. From EIA-860M, August 2026.
Largest power plants in Armstrong County
| # | Plant | MW | GWh, 2025 | Capacity factor |
|---|---|---|---|---|
| 1 | KeystoneCoal | 1,872 | −17.8* | – |
| 2 | ArmstrongNatural gas | 688 | 1,286 | 21.3% |
| 3 | Allegheny Hydro No 9Hydro | 18 | 86.4 | 55.4% |
| 4 | Allegheny Hydro No 8Hydro | 14 | 79.6 | 66.8% |
| 5 | Allegheny No. 5 Hydro StationHydro | 9.2 | 35.4 | 43.9% |
| 6 | Allegheny No 6 Hydro StationHydro | 9.2 | 35.6 | 44.2% |
| 7 | Mahoning Creek Hydroelectric ProjectHydro | 6.0 | 13.1 | 25.0% |
* Fewer than 12 months of 2025 reported, so the total is partial.
MW is the nameplate capacity of operating generators and batteries. Source: EIA-860M August 2026, published 2026-09-24, and EIA-923 2025. Page updated 2026-10-04. Data sources
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Other counties in Pennsylvania
Lancaster County15 plants · 1,815 MWFranklin County14 plants · 518 MWSomerset County13 plants · 443 MWPhiladelphia County12 plants · 559 MWYork County11 plants · 6,218 MWAllegheny County9 plants · 1,126 MWBerks County9 plants · 1,326 MWCambria County9 plants · 1,462 MWNorthampton County9 plants · 3,852 MW