30th largest plant in Pennsylvania · 520th nationally
Armstrong is a natural gas power plant in Pennsylvania with a nameplate capacity of 688 MW. It generates roughly 1.1M MWh per year — enough to power about 106,107 average U.S. homes.
Its capacity factor of 18% reflects intermittent or peaking operation. At 1240 lb CO₂/MWh, its emission rate sits above the national grid average of roughly 800 lb/MWh.
| Plant Name | Armstrong |
|---|---|
| Operator | Armstrong Power Llc |
| City | Shelocta |
| County | Armstrong County |
| State | Pennsylvania |
| ZIP | 15774 |
| Coordinates | 40.63802, -79.35173 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| 1 | Natural Gas Fired Combustion Turbine | Natural Gas | 172 MW | Operating | 2002 |
| 2 | Natural Gas Fired Combustion Turbine | Natural Gas | 172 MW | Operating | 2002 |
| 3 | Natural Gas Fired Combustion Turbine | Natural Gas | 172 MW | Operating | 2002 |
| 4 | Natural Gas Fired Combustion Turbine | Natural Gas | 172 MW | Operating | 2002 |
| CO₂ | 690.7k metric tons |
|---|---|
| SO₂ | 4 metric tons |
| NOₓ | 182 metric tons |
| CO₂ Rate | 1240 lb/MWh |
Annual totals and CO₂ rate reported by EPA eGRID for 2023. Reference averages are approximate U.S.-wide figures from the same dataset.
| NERC Region | RFC |
|---|---|
| Balancing Authority | Pjm Interconnection, Llc |
Natural gas plants are the workhorse of the modern grid. Combined-cycle units achieve very high efficiency and can ramp up and down quickly to balance variable renewables. They emit roughly half the CO₂ per MWh of coal and far less of other pollutants, but they still release upstream methane during fuel extraction.