46th largest plant in Louisiana · 2741st nationally
Atlantic Alumina, Gramercy Operations is a natural gas power plant in Louisiana with a nameplate capacity of 85.3 MW. It generates roughly 231.1k MWh per year — enough to power about 22,010 average U.S. homes.
Its capacity factor of 31% reflects intermittent or peaking operation. At 710 lb CO₂/MWh, its emission rate sits below the national grid average of roughly 800 lb/MWh.
Ghost bars are each month's theoretical maximum (85.3 MW nameplate × hours in the month). Filled bars are actual net generation reported to EIA Form 923. The gap between them is capacity factor made visible.
| Plant Name | Atlantic Alumina, Gramercy Operations |
|---|---|
| Operator | Atalco Gramercy Llc |
| City | Gramercy |
| County | St James County |
| State | Louisiana |
| ZIP | 70052 |
| Coordinates | 30.05400, -90.66930 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| GT4 | Natural Gas Fired Combustion Turbine | Natural Gas | 24.7 MW | Operating | 1974 |
| ST1 | Natural Gas Steam Turbine | Natural Gas | 18.7 MW | Operating | 1958 |
| ST2 | Natural Gas Steam Turbine | Natural Gas | 18.7 MW | Operating | 1958 |
| GT1 | Natural Gas Fired Combustion Turbine | Natural Gas | 16.0 MW | Retired | 1969 |
| GT2 | Natural Gas Fired Combustion Turbine | Natural Gas | 16.0 MW | Retired | 1969 |
| GT3 | Natural Gas Fired Combustion Turbine | Natural Gas | 16.0 MW | Operating | 1969 |
| ST3 | Natural Gas Steam Turbine | Natural Gas | 7.2 MW | Operating | 1969 |
| CO₂ | 82.1k metric tons |
|---|---|
| SO₂ | 1 metric tons |
| NOₓ | 143 metric tons |
| CO₂ Rate | 710 lb/MWh |
Annual totals and CO₂ rate reported by EPA eGRID for 2023. Reference averages are approximate U.S.-wide figures from the same dataset.
| NERC Region | SERC |
|---|---|
| Balancing Authority | Midcontinent Independent Transmission System Operator, Inc.. |
Natural gas plants are the workhorse of the modern grid. Combined-cycle units achieve very high efficiency and can ramp up and down quickly to balance variable renewables. They emit roughly half the CO₂ per MWh of coal and far less of other pollutants, but they still release upstream methane during fuel extraction.