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85.3 MW Natural Gas Fired Combustion Turbine (41 MW) + Natural Gas Steam Turbine (45 MW) operating in St James, LA
85.3 MW
Nameplate Capacity
5
Generators
units
Hybrid (2)
Technology
Natural Gas Fired Combustion Turbine + Natural Gas Steam Turbine
1958
Operating Since
Coordinates
30.0578, -90.6685
County
St James, LA
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Atalco Gramercy LLC | — | — |
| Owner(s) | Atalco Gramercy LLC | — | — |
| Status | Operating | — | — |
The Atlantic Alumina, Gramercy Operations power plant is located in St. James County, Louisiana. The plant, which began operating in 1958, has a total capacity of 85.3 MW across 5 generators. It is owned and operated by Atalco Gramercy LLC. The plant is fueled primarily by natural gas and utilizes both natural gas-fired combustion turbine and natural gas steam turbine technologies, classifying it as a hybrid plant.
In the most recent year of reported data, the plant generated 208,105 MWh, achieving a capacity factor of 27.8%. The Atlantic Alumina plant operates within the Midcontinent Independent Transmission System Operator (MISO) balancing authority and is situated in the SERC Reliability Corporation NERC region. It is ranked as the 34th largest power plant in Louisiana out of 51, and 986th nationally out of 1963 plants.
Generated from EIA, GEM, and public data sources
ISO/RTO
MISO
Market
ISO/RTO Member
NERC Region
SERC — SERC Reliability Corporation
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc.. (MISO)
Grid Voltage
13.8 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Industrial
Sector
Industrial CHP
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.
16.7K MWh
Latest Month
208.1K MWh
Annual Generation
27.8%
Capacity Factor
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CO₂ Intensity
710 lb/MWh
NOx
1 lb/MWh
SO₂
0.008 lb/MWh
CH₄
0.013 lb/MWh
N₂O
0.001 lb/MWh
Capacity Factor
30.9%
Annual Net Gen
231 GWh
CO₂eq
711 lb/MWh
Subregion
SERC Mississippi Valley
2013
$965/kW
Est. Construction Cost
Total estimated cost: $82.3M
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Market Position
ISO/RTO Market
MISO
LMP Node
—
Pricing Hub
LOUISIANA.HUB
Node Source
OSM spatial match
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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