Allegheny Hydro No 9
Hydro power plant · Armstrong County, Pennsylvania
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Allegheny Hydro LP
- County
- Armstrong County
- Generating units
- 2
- Share of state capacity
- 0.03%
- Rank among hydro plants in Pennsylvania
- #10 of 19
- EIA plant code
- 50898
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| GEN1 | Conventional Hydroelectric | 8.9 MW | 8.9 MW | 1990 | Operating |
| GEN2 | Conventional Hydroelectric | 8.9 MW | 8.9 MW | 1990 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Pennsylvania
| York Haven | Hydro | 20 MW |
| Meyersdale Battery | Battery storage | 18 MW |
| Pine 1 Solar | Solar | 17 MW |
| Pine 2 Solar | Solar | 17 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 18 MW solar plant and a 18 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Pennsylvania power plants · What Pennsylvania actually generates