349 MW Natural Gas standby in Washington, AR — Southwest Power Pool
349 MW
Nameplate Capacity
4
Generators
units
Natural Gas Fired Combustion Turbine
Technology
2007
Operating Since
Coordinates
36.1855, -94.2841
County
Washington, AR
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Southwestern Electric Power Co | Southwestern Electric Power | — |
| Owner(s) | Southwestern Electric Power Co | American Electric Power Company | — |
| Status | Standby | — | — |
The Harry D Mattison Gas Plant is a 349 MW natural gas-fired power plant located in Washington County, Arkansas. The plant began operating in 2007 and consists of four natural gas-fired combustion turbine generators. It is owned by American Electric Power Company and operated by Southwestern Electric Power Co. The plant is located within the Southwest Power Pool (SPP) balancing authority and the Midwest Reliability Organization (MRO) NERC region.
The Harry D Mattison Gas Plant generated 278,682 MWh in the latest annual reporting period, achieving a capacity factor of 9.0%. The plant ranks as the 7th largest in Arkansas out of 12 plants, and 598th nationally out of 945 plants. Financial data indicates an installed cost of $382.63 per kW, based on FERC filings.
Generated from EIA, GEM, and public data sources
NERC Region
MRO
Balancing Authority
Southwest Power Pool
Grid Voltage
161 kV
Regulatory Status
RE
Entity Type
Investor-Owned Utility
Sector
Electric Utility
0 MWh
Latest Month
278.7K MWh
Annual Generation
9.0%
Capacity Factor
$378/kW
Installed Cost
$65.2/MWh
Operating Cost
Southwestern Electric Power Company
Reporting Utility
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
Point of Interconnection
Nearest Substation
Tontitown Substation · 345 kV
Substation Distance
0 km
Operator
Southwestern Electric Power Company
Coord Source
OSM spatial
Market Position
ISO/RTO Market
SPP
LMP Node
CSWMATTISON2
Pricing Hub
SPP South Hub
Node Source
Curated node match
Last updated 2026-03-26
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