Southwestern
Natural gas power plant · Caddo County, Oklahoma
Nameplate capacity
658 MW
Rank in Oklahoma
#14
of 147 plants
In service since
1952
July 1952
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Steam Turbine
- Operator
- Public Service Co of Oklahoma
- County
- Caddo County
- Generating units
- 6
- Share of state capacity
- 1.81%
- Rank among natural gas plants in Oklahoma
- #10 of 33
- EIA plant code
- 2964
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 3 | Natural Gas Steam Turbine | 315 MW | 311 MW | 1967 | Operating |
| 4 | Natural Gas Fired Combustion Turbine | 87 MW | 76 MW | 2008 | Operating |
| 5 | Natural Gas Fired Combustion Turbine | 87 MW | 76 MW | 2008 | Operating |
| 1 | Natural Gas Steam Turbine | 84 MW | 56 MW | 1952 | Operating |
| 2 | Natural Gas Steam Turbine | 84 MW | 79 MW | 1954 | Operating |
| IC1 | Petroleum Liquids | 2.0 MW | 2.0 MW | 1966 | Out of service and NOT expected to return to service in next calendar year |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Oklahoma
| Green Country Power Station | Natural gas | 904 MW |
| Skeleton Creek Energy Center Hybrid | Battery storage | 752 MW |
| Wagon Wheel Wind | Wind | 598 MW |
| Horseshoe Lake | Natural gas | 564 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 658 MW solar plant and a 658 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Oklahoma power plants · What Oklahoma actually generates