# Southwestern

SPP asset profile · https://askthegrid.com/assets/facilities/southwestern

## Current generation inventory

EIA plant 2964 · Inventory reporting month: 2026-08.

- natural gas: 656 MW operating nameplate
- Capacity basis: operating_generator_nameplate_mw
- Source inventory: [EIA-860M workbook (preliminary)](https://www.eia.gov/electricity/data/eia860m/xls/august_generator2026.xlsx)
- Inventory retrieved: 2026-10-10T02:12:40.665346+00:00
- Filed coordinate (longitude, latitude): -98.3524, 35.1009
- OSM extract: 2026-10-08T20:21:06Z
- OSM mapped edit: 2026-07-19 02:57:10+00:00
- Map prepared: 2026-10-10T02:28:20.778163+00:00

Battery power (MW) and stored energy (MWh) are separate measures. Shared physical-site membership does not establish electrical connectivity, settlement or a common export limit.

## Reviewed overview

Southwestern Station is a gas-fueled power plant near Anadarko, Oklahoma, owned and operated by Public Service Company of Oklahoma, a unit of American Electric Power. PSO approved a 170 MW peaking addition in 2006, and two 85 MW combustion turbines were declared commercially available on February 29, 2008, raising the plant's total capacity to 608 MW. The peaking units help PSO meet demand during periods of peak load.

## Reviewed metrics

- **Nameplate capacity:** 656 MW — Canonical EIA plant baseline.
- **Registry anchor:** Plant 2964 — plant-2964

## Facts

- **Technology:** Natural Gas Steam Turbine, Natural Gas Fired Combustion Turbine
- **Operator:** Public Service Company of Oklahoma

## Related parties

- **Parent company:** American Electric Power — parent_company ([source](https://www.aep.com))

## Sources

- [aepohio.com](https://www.aepohio.com/company/news/view?releaseID=2005) — aepohio.com · public_source — Source retained for exact-record publication review.

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Canonical page: https://askthegrid.com/assets/facilities/southwestern
Website: [Public Service Company of Oklahoma](https://www.psoklahoma.com)

Source: Ask the Grid — https://askthegrid.com/