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919.1 MW Natural Gas Fired Combustion Turbine (42 MW) + Natural Gas Steam Turbine (877 MW) operating in Harrison, MS
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
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| 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
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
87.4K MWh
Latest Month
2.6M MWh
Annual Generation
32.6%
Capacity Factor
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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
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This plant's balancing authority participates in the Southeast Energy Exchange Market (SEEM). SEEM is a bilateral exchange — no public nodal pricing.
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-26
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