13th largest plant in Arkansas · 928th nationally
Harry D Mattison Gas Plant is a natural gas power plant in Arkansas with a nameplate capacity of 349 MW. It generates roughly 177.2k MWh per year — enough to power about 16,875 average U.S. homes.
Its capacity factor of 6% reflects intermittent or peaking operation. At 1500 lb CO₂/MWh, its emission rate sits above the national grid average of roughly 800 lb/MWh.
| Plant Name | Harry D Mattison Gas Plant |
|---|---|
| Operator | Southwestern Electric Power Co |
| City | Tontitown |
| County | Washington County |
| State | Arkansas |
| ZIP | 72770 |
| Coordinates | 36.18550, -94.28410 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| 3 | Natural Gas Fired Combustion Turbine | Natural Gas | 88.0 MW | Standby | 2007 |
| 4 | Natural Gas Fired Combustion Turbine | Natural Gas | 88.0 MW | Standby | 2007 |
| 1 | Natural Gas Fired Combustion Turbine | Natural Gas | 86.5 MW | Standby | 2007 |
| 2 | Natural Gas Fired Combustion Turbine | Natural Gas | 86.5 MW | Standby | 2007 |
| CO₂ | 132.9k metric tons |
|---|---|
| SO₂ | 1 metric tons |
| NOₓ | 70 metric tons |
| CO₂ Rate | 1500 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 | MRO |
|---|---|
| Balancing Authority | Southwest Power Pool |
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.