Keystone
Coal power plant · Armstrong County, Pennsylvania
Details
- Primary fuel
- Coal
- Technology
- Conventional Steam Coal
- Operator
- KeyCon Operating LLC
- County
- Armstrong County
- Generating units
- 6
- Share of state capacity
- 3.55%
- Rank among coal plants in Pennsylvania
- #2 of 13
- EIA plant code
- 3136
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Conventional Steam Coal | 936 MW | 850 MW | 1967 | Operating |
| 2 | Conventional Steam Coal | 936 MW | 850 MW | 1968 | Operating |
| 4 | Petroleum Liquids | 2.9 MW | 2.8 MW | 1968 | Standby/Backup: available for service but not normally used |
| 5 | Petroleum Liquids | 2.9 MW | 2.8 MW | 1968 | Standby/Backup: available for service but not normally used |
| 6 | Petroleum Liquids | 2.9 MW | 2.8 MW | 1968 | Standby/Backup: available for service but not normally used |
| 3 | Petroleum Liquids | 2.5 MW | 2.8 MW | 1968 | Standby/Backup: available for service but not normally used |
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
| Limerick | Nuclear | 2,277 MW |
| Conemaugh | Coal | 1,963 MW |
| Beaver Valley | Nuclear | 1,847 MW |
| TalenEnergy Montour | Natural gas | 1,758 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 1,883 MW solar plant and a 1,883 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