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
Gramercy alumina refinery put on notice for toxic discharges into Mississippi River
State regulators warn Atalco refinery after river water tests show deadly toxicity to aquatic life near Gramercy, Louisiana.
Atalco alumina refinery faces lawsuit from Louisiana environmental group
An environmental group has filed a federal lawsuit against an alumina refinery that allowed toxic pollution to escape into public waterways.
Runoff from Atalco alumina refinery into Mississippi River raises environmental concerns
A cloudy, rust-colored liquid plume flowed into the Mississippi River last week out of a drainage pipe from the Atlantic Alumina refinery.
Red Alert: Public reported problems at Atalco refinery long before inspectors found levee breaches
This article is the second in a series on the environmental costs of America's last remaining alumina refinery. Read Part 1. GRAMERCY...
Last updated 2026-03-26
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