85.3 MW Natural Gas Fired Combustion Turbine (41 MW) + Natural Gas Steam Turbine (45 MW) operating in St James, LA — Midcontinent Independent Transmission System Operator, Inc..
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
| 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
NERC Region
SERC
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc..
Grid Voltage
13.8 kV
Regulatory Status
NR
Entity Type
Industrial
Sector
Industrial CHP
16.7K MWh
Latest Month
208.1K MWh
Annual Generation
27.8%
Capacity Factor
No financial data available for this plant.
Market Position
ISO/RTO Market
MISO
LMP Node
—
Pricing Hub
LOUISIANA.HUB
Node Source
OSM spatial match
Last updated 2026-03-26
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