Power plants operated by Southwestern Public Service Co
Southwestern Public Service Co operates 10 power plants in the 2025 EIA-860 data, with 5,424 MW of nameplate capacity, the 48th-largest fleet among the 5,826 operators on file. They are spread over two states: Texas and New Mexico. Natural gas is 60% of the capacity; the largest site is Tolk. Its oldest working unit dates from 1960, at Nichols. Units added from 2020 to 2025 total 522 MW.
- Natural gas3,262 MW60%
- Coal1,136 MW21%
- Wind1,000 MW18%
- Oil and petroleum27 MW0.5%
Capacity by decade it came online
CoalNatural gasOil and petroleumWind
Above the line: capacity operating in 2025. Below: capacity retired at these plants.
Plants
| Plant | State | Runs on | Capacity | First unit |
|---|---|---|---|---|
| Tolk | Texas | Coal | 1,136 MW | 1982 |
| Harrington | Texas | Natural gas | 1,080 MW | 1976 |
| Jones | Texas | Natural gas | 860 MW | 1971 |
| Sagamore Wind | New Mexico | Wind | 522 MW | 2020 |
| Hale Community Wind Farm | Texas | Wind | 478 MW | 2019 |
| Nichols | Texas | Natural gas | 475 MW | 1960 |
| Cunningham | New Mexico | Natural gas | 444 MW | 1965 |
| Maddox | New Mexico | Natural gas | 212 MW | 1963 |
| Plant X | Texas | Natural gas | 190 MW | 1964 |
| Quay County | New Mexico | Oil and petroleum | 27 MW | 2013 |