Keystone
Keystone is a coal plant in Armstrong County, Pennsylvania, operated by KeyCon Operating LLC. It ranks fifth by nameplate capacity among Pennsylvania’s 273 power plants. Ownership is shared by five organizations; the largest stake, 44%, is held by Chief Keystone Power LLC. Its oldest working unit dates from 1967, the second-earliest start among Pennsylvania’s 13 coal plants.
Nameplate capacity, 2025
1,883 MW
1,711 MW net summer capacity
6 operable units
- Coal steam1,872 MW99%
- Oil-fired11.2 MW0.6%
Unit by unit, 1967 to 2025
operating in 2025bar height follows unit size
Unit 1 Coal steam, 936 MW, 1967
Unit 2 Coal steam, 936 MW, 1968
Unit 3 Oil-fired, 2.5 MW, 1968
Unit 4 Oil-fired, 2.9 MW, 1968
Unit 5 Oil-fired, 2.9 MW, 1968
Unit 6 Oil-fired, 2.9 MW, 1968
Among Pennsylvania’s plants
Largest plants in the state by nameplate capacity, with the plants ranked next to this one.
- 1Peach Bottom2,876 MW
- 2TalenEnergy Susquehanna2,532 MW
- 3Limerick2,277 MW
- 4Conemaugh1,963 MW
- 5Keystonethis plant
- 6Beaver Valley1,847 MW
- 7TalenEnergy Montour1,758 MW
Other rankings
- All US power plants
- 80th of 14,286
- US coal plants
- 23rd of 195
- Coal plants in Pennsylvania
- 2nd of 13
- Plants in the PJM Interconnection balancing area
- 19th of 2,049
- Plants run by KeyCon Operating LLC
- 2nd of 2
- Biggest single unit, among Pennsylvania’s plants
- 6th of 273
Operable units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Coal steam | 936 MW | 850 MW | 1967 | Operating |
| 2 | Coal steam | 936 MW | 850 MW | 1968 | Operating |
| 3 | Oil-fired | 2.5 MW | 2.8 MW | 1968 | Standby |
| 4 | Oil-fired | 2.9 MW | 2.8 MW | 1968 | Standby |
| 5 | Oil-fired | 2.9 MW | 2.8 MW | 1968 | Standby |
| 6 | Oil-fired | 2.9 MW | 2.8 MW | 1968 | Standby |
Who owns it
Shares are weighted by the nameplate capacity of each unit an owner holds.
| Owner | Share of capacity |
|---|---|
| Chief Keystone Power LLC | 44.4% |
| Chief Keystone Power II, LLC | 22.8% |
| Keystone Power Pass-Through Holders LLC | 16.7% |
| Montour LLC | 12.3% |
| Keystone Power LLC | 3.7% |
Grid and site
- Balancing area
- PJM Interconnection
- Reliability region
- ReliabilityFirst
- Highest grid connection voltage
- 500 kV
- Water source
- Crooked Creek
- Nearest town on record
- Shelocta
- Operator type
- Independent producer
- Coordinates
- 40.660°N, 79.341°W
Closest plants
| Plant | Runs on | Capacity | Distance |
|---|---|---|---|
| Armstrong | Natural gas | 688 MW | 1.6 mi south |
| Indiana University of Pennsylvania | Natural gas | 24.4 MW | 10.0 mi east |
| Allegheny No 6 Hydro Station | Hydroelectric | 9.2 MW | 13.0 mi west |
| Conemaugh Hydro Plant | Hydroelectric | 15 MW | 13.6 mi south |
| Allegheny No. 5 Hydro Station | Hydroelectric | 9.2 MW | 17.1 mi west |
| Allegheny Hydro No 8 | Hydroelectric | 13.6 MW | 17.8 mi northwest |
| Mahoning Creek Hydroelectric Project | Hydroelectric | 6 MW | 18.3 mi north |
| Allegheny Hydro No 9 | Hydroelectric | 17.8 MW | 23.2 mi northwest |