Atlantic Alumina, Gramercy Operations
Atlantic Alumina, Gramercy Operations is a 85 MW natural gas power plant in St James County, Louisiana, operated by Atalco Gramercy LLC. EIA-860M lists 5 generating units here, inside MISO. Its units entered service between 1958 and 1974.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Nameplate capacity
- 85.3 MW
- 76 MW net summer
- Generating units
- 5
- In service
- 1958–1974
- EIA plant ID
- 50846
Where it is
Loading map…
- County
- St James County, Louisiana
- Coordinates
- 30.054, -90.6693
- Balancing authority
- MISO
- Sector
- Industrial CHP
Units, technology and status
- Operator of record
- Atalco Gramercy LLC
- Primary energy source
- Natural gas
- Technologies
- Natural Gas Fired Combustion Turbine, Natural Gas Steam Turbine
- Status
- Operating
Atlantic Alumina, Gramercy Operations: FAQ
- Where is Atlantic Alumina, Gramercy Operations?
- In St James County, Louisiana (LA). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
- How big is Atlantic Alumina, Gramercy Operations?
- 85 MW of nameplate capacity across 5 units, as of the EIA-860M release for 2026-07.
- Who owns Atlantic Alumina, Gramercy Operations?
- EIA-860M names Atalco Gramercy LLC as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is this the same as Atlantic Alumina, Gramercy Operations LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Atalco Gramercy LLC here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Atlantic Alumina, Gramercy Operations LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Atlantic Alumina, Gramercy Operations still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.