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919.1 MW Natural Gas Fired Combustion Turbine (42 MW) + Natural Gas Steam Turbine (877 MW) operating in Harrison, MS — Southern Company Services, Inc. - Trans
919.1 MW
Nameplate Capacity
3
Generators
units
Hybrid (2)
Technology
Natural Gas Fired Combustion Turbine + Natural Gas Steam Turbine
1968
Operating Since
Coordinates
30.4392, -89.0286
County
Harrison, MS
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Mississippi Power Co | Mississippi Power | — |
| Owner(s) | Mississippi Power Co | Southern | — |
| Status | Operating | — | — |
The Jack Watson plant is a 919.1 MW hybrid natural gas power plant located in Harrison County, Mississippi. It began operating in 1968 and is owned by Southern Company and operated by Mississippi Power Co. The plant utilizes both natural gas-fired combustion turbine and natural gas steam turbine technologies across its three generators. It ranks as the third-largest power plant in Mississippi out of 20, and 197th nationally out of 945 plants.
In the most recent year of data, the Jack Watson plant generated 2,633,847 MWh of electricity, achieving a capacity factor of 32.6%. The plant operates within the Southern Company Services, Inc. - Trans balancing authority and is located in the SERC NERC region. Recent news coverage of the plant includes hazards and regulatory issues.
Generated from EIA, GEM, and public data sources
Grid Region
Southeast
Market
SEEM Participant
NERC Region
SERC — SERC Reliability Corporation
Balancing Authority
Southern Company Services, Inc. - Trans (SOCO)
Grid Voltage
230.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
87.4K MWh
Latest Month
2.6M MWh
Annual Generation
32.6%
Capacity Factor
CO₂ Intensity
1237 lb/MWh
NOx
2 lb/MWh
SO₂
0.006 lb/MWh
CH₄
0.023 lb/MWh
N₂O
0.002 lb/MWh
Capacity Factor
40.6%
Annual Net Gen
3272 GWh
CO₂eq
1238 lb/MWh
Subregion
SERC South
2013
$965/kW
Est. Construction Cost
Total estimated cost: $887.0M
This plant's balancing authority participates in the Southeast Energy Exchange Market (SEEM). SEEM is a bilateral exchange — no public nodal pricing.
Last updated 2026-03-26
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