Where is Southwestern?

In Caddo County, Oklahoma (OK). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.

How big is Southwestern?

658 MW of nameplate capacity across 6 units, as of the EIA-860M release for 2026-07.

Who owns Southwestern?

EIA-860M names Public Service Co of Oklahoma as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.

Is this the same as Southwestern LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Public Service Co of Oklahoma here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Southwestern LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Southwestern still running?

EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.

Southwestern

Southwestern is a 658 MW natural gas power plant in Caddo County, Oklahoma, operated by Public Service Co of Oklahoma. EIA-860M lists 6 generating units here, inside SPP. Its units entered service between 1952 and 2008.

As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m

Nameplate capacity: 658 MW; 600 MW net summer
Generating units: 6
In service: 1952–2008
EIA plant ID: 2964

Where it is

Loading map…

County: Caddo County, Oklahoma
Coordinates: 35.1009, -98.3524
Balancing authority: SWPP
Sector: Electric Utility

Units, technology and status

Operator of record: Public Service Co of Oklahoma
Primary energy source: Natural gas
Technologies: Natural Gas Fired Combustion Turbine, Natural Gas Steam Turbine, Petroleum Liquids
Status: Operating (5) · Out of service and NOT expected to return to service in next calendar year (1)

This site runs on more than one energy source. EIA-860M capacity splits: Natural gas 656 MW, Petroleum 2 MW. It is filed here under Natural gas, the source with the most capacity.

Every plant Public Service Co of Oklahoma reports to EIA →

Southwestern: FAQ

Where is Southwestern?: In Caddo County, Oklahoma (OK). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
How big is Southwestern?: 658 MW of nameplate capacity across 6 units, as of the EIA-860M release for 2026-07.
Who owns Southwestern?: EIA-860M names Public Service Co of Oklahoma as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
Is this the same as Southwestern LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Public Service Co of Oklahoma here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Southwestern LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Southwestern still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.