Power plants operated by Southwestern Electric Power Co
Southwestern Electric Power Co operates 12 power plants in the 2025 EIA-860 data, with 6,640 MW of nameplate capacity, the 37th-largest fleet among the 5,826 operators on file. They are spread over four states: Texas, Louisiana, Arkansas and Oklahoma. Natural gas is 39% of the capacity; the largest site is Welsh. Its oldest working unit dates from 1957, at Lieberman. Units added from 2020 to 2025 total 1,798 MW.
- Natural gas2,559 MW39%
- Coal2,283 MW34%
- Wind1,798 MW27%
Capacity by decade it came online
CoalNatural gasWind
Above the line: capacity operating in 2025. Below: capacity retired at these plants.
Plants
| Plant | State | Runs on | Capacity | First unit |
|---|---|---|---|---|
| Welsh | Texas | Coal | 1,116 MW | 1977 |
| Traverse Wind Project, LLC | Oklahoma | Wind | 999 MW | 2022 |
| Wilkes | Texas | Natural gas | 882 MW | 1964 |
| J Lamar Stall Unit | Louisiana | Natural gas | 624 MW | 2010 |
| John W Turk Jr Power Plant | Arkansas | Coal | 609 MW | 2012 |
| Wagon Wheel Wind | Oklahoma | Wind | 598 MW | 2025 |
| Flint Creek | Arkansas | Coal | 558 MW | 1978 |
| Knox Lee | Texas | Natural gas | 351 MW | 1974 |
| Harry D Mattison Gas Plant | Arkansas | Natural gas | 349 MW | 2007 |
| Lieberman | Louisiana | Natural gas | 228 MW | 1957 |
| Diversion Wind Energy LLC | Texas | Wind | 201 MW | 2024 |
| Arsenal Hill | Louisiana | Natural gas | 125 MW | 1960 |