Plaquemine Cogeneration Plant
Iberville County, Louisiana · EIA plant ID 55419 · Operator: Dow Chemical Co
Nameplate1,085MWSummer 891 MW
Generators7in service
Net generation5,682GWh12 mo to Aug 2026
Capacity factor73%gas/coal/oil units, summer MW
Heat rate7,825Btu/kWhfossil units, electric fuel, HHV
First online2004Runs as baseload
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2004 | 3,535.2 | 57.1% | 6,393 |
| 2005 | 3,818 | 51.7% | 6,395 |
| 2006 | 4,196.1 | 56.8% | 6,394 |
| 2007 | 3,698.9 | 53.3% | 6,394 |
| 2008 | 3,520.6 | 50.5% | 6,395 |
| 2009 | 3,855.2 | 55.5% | 6,394 |
| 2010 | 4,432.5 | 63.8% | 6,394 |
| 2011 | 4,429.2 | 63.8% | 6,383 |
| 2012 | 5,189.4 | 74.5% | 6,352 |
| 2013 | 5,411.2 | 77.9% | 6,374 |
| 2014 | 4,585.2 | 66.0% | 6,367 |
| 2015 | 4,262.7 | 61.4% | 6,442 |
| 2016 | 4,888.2 | 70.2% | 7,666 |
| 2017 | 4,438.5 | 63.9% | 7,788 |
| 2018 | 4,441.6 | 63.9% | 7,838 |
| 2019 | 5,341.9 | 76.9% | 7,796 |
| 2020 | 4,900.9 | 70.4% | 7,789 |
| 2021 | 4,996.2 | 71.9% | 7,832 |
| 2022 | 5,001.1 | 72.0% | 7,827 |
| 2023 | 4,969.1 | 71.5% | 7,870 |
| 2024 | 4,831.7 | 68.7% | 7,904 |
| 2025 | 5,754.1 | 73.7% | 7,870 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| G500 | Natural Gas Fired Combined Cycle | CT | 198 | 151 | Mar 2004 | Operating | — | coming soon |
| G600 | Natural Gas Fired Combined Cycle | CT | 198 | 151 | Mar 2004 | Operating | — | coming soon |
| G700 | Natural Gas Fired Combined Cycle | CT | 198 | 151 | Mar 2004 | Operating | — | coming soon |
| G800 | Natural Gas Fired Combined Cycle | CT | 198 | 151 | Mar 2004 | Operating | — | coming soon |
| ST5 | Natural Gas Fired Combined Cycle | CA | 195 | 189 | Mar 2004 | Operating | — | coming soon |
| ST6 | Natural Gas Fired Combined Cycle | CA | 48.9 | 48.9 | Dec 2024 | Operating | — | coming soon |
| ST7 | Natural Gas Fired Combined Cycle | CA | 48.9 | 48.9 | Dec 2024 | Operating | — | coming soon |
Owner / operator
Operator: Dow Chemical Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Dow Chemical Co | 100.0% | 1,085 MW |
Nearby plants
Within 80 km.
| LaO Energy Systems | retired | 0.4 km |
| Axiall Plaquemine | 306 MW | 8.5 km |
| Cypress Harvest Solar Station | — | 9.8 km |
| Magnolia Power | 723 MW | 10.2 km |
| LSU Cogen | 20 MW | 11.1 km |
| Port Allen (LA) | 8 MW | 17.4 km |