Atlantic Alumina, Gramercy Operations — Plant Summary
- EIA Plant ID
- 50846
- Capacity
- 85.3 MW
- Primary Fuel
- Natural Gas
- Technology
- Natural Gas Fired Combustion Turbine, Natural Gas Steam Turbine
- Status
- Operating
- Location
- St James, LA
- Operating Since
- 1958
- Generators
- 5
- Operator
- Atalco Gramercy LLC
- Parent Company
- —
- Annual Generation
- 208,104.8 MWh
- Capacity Factor
- 27.8%
- Balancing Authority
- Midcontinent Independent Transmission System Operator, Inc..
- ISO/RTO
- MISO
- NERC Region
- SERC
Atlantic Alumina, Gramercy Operations
OperatingNatural GasHybrid
Ranked #35 of 52 Natural Gas plants in LA#992 of 2009 nationally
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..
EIAWD
85.3 MW
Nameplate Capacity
5
Generators
units
Hybrid (2)
Technology
Natural Gas Fired Combustion Turbine + Natural Gas Steam Turbine
1958
Operating Since
Location
Coordinates
30.0578, -90.6685
County
St James, LA
Nearby Plants
- Louisiana Sugar RefiningNatural Gas6.7 MW · 1.7 km
- Vacherie Solar Energy Center, LLCSolar150 MW · 10.5 km
- St. James Solar (LA)Solar20 MW · 11.2 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Atalco Gramercy LLC | — | — |
| Owner(s) | Atalco Gramercy LLC | — | — |
| Status | Operating | — | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
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
Engineering & Generators
Grid Context
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
Generation
16.7K MWh
Latest Month
208.1K MWh
Annual Generation
27.8%
Capacity Factor
Jan 2022 – Dec 2024
Financial Data
No financial data available for this plant.
Pricing & Market Data
MEDIUM confidenceMarket Position
ISO/RTO Market
MISO
LMP Node
—
Pricing Hub
LOUISIANA.HUB
Node Source
OSM spatial match
News & Articles (10)Beta
Regulatory·state puc
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 (other)Louisiana (other)
New Orleans CityBusiness·4 months ago
Regulatory·federal policy
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.
Atalco (other)Louisiana (other)
Louisiana Illuminator·4 months ago
Regulatory·federal policy
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.
Atalco (other)Atlantic Alumina (other)
Louisiana Illuminator·4 months ago
Regulatory·federal policy
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...
Atalco (other)
Louisiana Illuminator·9 months ago
Last updated 2026-03-26
View all 10 articles