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658 MW Natural Gas Fired Combustion Turbine (173 MW) + Natural Gas Steam Turbine (483 MW) + Petroleum Liquids (2 MW) operating in Caddo, OK — Southwest Power Pool
658 MW
Nameplate Capacity
6
Generators
units
Hybrid (3)
Technology
Natural Gas Fired Combustion Turbine + Natural Gas Steam Turbine + Petroleum Liquids
1952
Operating Since
Coordinates
35.1009, -98.3524
County
Caddo, OK
Nearby Plants
Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Public Service Co of Oklahoma | Public Service Company of Oklahoma | — |
| Owner(s) | Public Service Co of Oklahoma | American Electric Power Company | — |
| Status | Operating | — | — |
The Southwestern power plant is located in Caddo County, Oklahoma. It is owned by the American Electric Power Company and operated by the Public Service Co of Oklahoma. The plant has a total capacity of 658 MW across 6 generators, utilizing a combination of natural gas-fired combustion turbines, natural gas steam turbines, and petroleum liquids. Southwestern began operating in 1952 and is considered a hybrid plant due to its multiple fuel and technology types.
Southwestern operates within the Southwest Power Pool (SPP) balancing authority and the Midwest Reliability Organization (MRO) NERC region. In the most recent year of data, the plant generated 779,423 MWh of electricity, achieving a capacity factor of 13.5%. Southwestern is ranked as the 12th largest power plant in Oklahoma out of 26, and nationally it is ranked 351st out of 945 plants.
Generated from EIA, GEM, and public data sources
ISO/RTO
SPP
Market
ISO/RTO Member
NERC Region
MRO — Midwest Reliability Organization
Balancing Authority
Southwest Power Pool (SWPP)
Grid Voltage
138.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
19.1K MWh
Latest Month
779.4K MWh
Annual Generation
13.5%
Capacity Factor
CO₂ Intensity
1500 lb/MWh
NOx
3 lb/MWh
SO₂
0.008 lb/MWh
CH₄
0.028 lb/MWh
N₂O
0.003 lb/MWh
Capacity Factor
18.1%
Annual Net Gen
1044 GWh
CO₂eq
1501 lb/MWh
Subregion
SPP South
2013
$965/kW
Est. Construction Cost
Total estimated cost: $635.0M
Point of Interconnection
Nearest Substation
Southwestern Station
Substation Distance
0.13 km
Operator
Public Service Company of Oklahoma
Coord Source
OSM spatial
Market Position
ISO/RTO Market
SPP
LMP Node
CSWSOUTHWESTERN1
Pricing Hub
SPP South Hub
Location Type
Settlement Location
Node Source
Curated node match
Last updated 2026-04-09
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