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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
ISO/RTO
SPP
Market
ISO/RTO Member
NERC Region
MRO — Midwest Reliability Organization
Balancing Authority
Southwest Power Pool (SWPP)
Grid Voltage
161.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
0 MWh
Latest Month
278.7K MWh
Annual Generation
9.0%
Capacity Factor
CO₂ Intensity
1500 lb/MWh
NOx
0.787 lb/MWh
SO₂
0.007 lb/MWh
CH₄
0.026 lb/MWh
N₂O
0.003 lb/MWh
Capacity Factor
5.8%
Annual Net Gen
177 GWh
CO₂eq
1501 lb/MWh
Subregion
SPP South
Gas turbine · Southwestern Electric Power Company · Data from 2015–2024
$378/kW
Installed Cost
$-376/kW
Annual CapEx
$65.2/MWh
Operating Cost
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
Location Type
Settlement Location
Node Source
Curated node match
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