Allegheny Energy Units 3 4 & 5
Natural gas power plant · Allegheny County, Pennsylvania
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combined Cycle
- Operator
- Springdale Energy LLC
- County
- Allegheny County
- Generating units
- 3
- Share of state capacity
- 1.05%
- Rank among natural gas plants in Pennsylvania
- #26 of 72
- EIA plant code
- 55710
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| UNT5 | Natural Gas Fired Combined Cycle | 188 MW | 199 MW | 2003 | Operating |
| UNT3 | Natural Gas Fired Combined Cycle | 184 MW | 181 MW | 2003 | Operating |
| UNT4 | Natural Gas Fired Combined Cycle | 184 MW | 183 MW | 2003 | 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
| Liberty Electric Power Plant | Natural gas | 614 MW |
| Seward (PA) | Coal | 585 MW |
| Croydon CT Generating Station | Other | 546 MW |
| Birdsboro Power | Natural gas | 525 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 556 MW solar plant and a 556 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