Atlantic Alumina, Gramercy Operations
Natural gas power plant in St James Parish, Louisiana. 85.3 MW of nameplate capacity across 5 generators, operated by Atalco Gramercy LLC.
Also known as Atlantic Alumina Cogen · EIA plant 50846
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Key facts
- Capacity
- 85.3 MWNameplate
- Generators
- 5 operatingEIA-860M, August 2026
- Operating since
- February 1958First generator online
- Operator
- Atalco Gramercy LLCEIA operator ID 56097
- Grid
- MISOBalancing authority MISO
- Price nodes
- None linkedNo verified ISO node
- Location
- St James Parish, LA30.0540, −90.6693
- EIA plant ID
- 50846EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Atlantic Alumina, Gramercy Operations produces
Free · EIA-923Net generation, 2025
181 GWh
180,696 MWh, final
Capacity factor, 2025
24.2%
2024: 27.8%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
180.7–301.1
GWh a year. Low 2025, high 2020
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 478,855 | Not reported | 12 of 12 |
| 2001 | 236,015 | Not reported | 12 of 12 |
| 2002 | 252,158 | Not reported | 12 of 12 |
| 2003 | 264,655 | Not reported | 12 of 12 |
| 2004 | 0 | Not reported | 12 of 12 |
| 2005 | 249,288 | Not reported | 12 of 12 |
| 2006 | 247,345 | Not reported | 12 of 12 |
| 2007 | 228,550 | Not reported | 12 of 12 |
| 2008 | 250,153 | Not reported | 12 of 12 |
| 2009 | 232,988 | Not reported | 12 of 12 |
| 2010 | 264,318 | 25.7% | 12 of 12 |
| 2011 | 273,242 | 26.6% | 12 of 12 |
| 2012 | 263,425 | 25.6% | 12 of 12 |
| 2013 | 263,790 | 25.7% | 12 of 12 |
| 2014 | 242,159 | 23.6% | 12 of 12 |
| 2015 | 237,875 | 31.8% | 12 of 12 |
| 2016 | 228,802 | 30.5% | 12 of 12 |
| 2017 | 237,303 | 31.8% | 12 of 12 |
| 2018 | 254,603 | 34.1% | 12 of 12 |
| 2019 | 283,939 | 38.0% | 12 of 12 |
| 2020 | 301,055 | 40.2% | 12 of 12 |
| 2021 | 266,463 | 35.7% | 12 of 12 |
| 2022 | 256,832 | 34.4% | 12 of 12 |
| 2023 | 231,113 | 30.9% | 12 of 12 |
| 2024 | 208,105 | 27.8% | 12 of 12 |
| 2025 | 180,696 | 24.2% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| GT3 | Natural Gas Fired Combustion Turbine | 16.0 | April 1969 |
| GT4 | Natural Gas Fired Combustion Turbine | 24.7 | April 1974 |
| ST1 | Natural Gas Steam Turbine | 18.7 | February 1958 |
| ST2 | Natural Gas Steam Turbine | 18.7 | February 1958 |
| ST3 | Natural Gas Steam Turbine | 7.2 | February 1969 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Atalco Gramercy LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Questions about Atlantic Alumina, Gramercy Operations
How much power does Atlantic Alumina, Gramercy Operations produce?
Atlantic Alumina, Gramercy Operations reported 180,696 MWh (181 GWh) of net generation in 2025, a 24.2% capacity factor on 85.3 MW of nameplate capacity.
Where is Atlantic Alumina, Gramercy Operations?
Atlantic Alumina, Gramercy Operations is in St James Parish, Louisiana, at 30.0540, −90.6693. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates Atlantic Alumina, Gramercy Operations?
EIA-860M for August 2026 lists Atalco Gramercy LLC as the operator (EIA operator ID 56097). The operator is not always the owner.
When did Atlantic Alumina, Gramercy Operations start operating?
Its first generator began operating in February 1958, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page