Westlake Plaquemine
Natural gas power plant in Iberville Parish, Louisiana. 306 MW of nameplate capacity across 3 generators, operated by Westlake Chemicals & Vinyls LLC.
Also known as Axiall Plaquemine Cogen · EIA plant 55051
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 306 MWNameplate
- Generators
- 3 operatingEIA-860M, August 2026
- Operating since
- May 1997First generator online
- Operator
- Westlake Chemicals & Vinyls LLCEIA operator ID 65195
- Grid
- MISOBalancing authority MISO
- Price nodes
- 1 MISO nodeResource nodes with prices
- Location
- Iberville Parish, LA30.2586, −91.1850
- EIA plant ID
- 55051EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Westlake Plaquemine produces
Free · EIA-923Net generation, 2025
1.50 TWh
1,495,275 MWh, final
Capacity factor, 2025
55.8%
2024: 57.6%
January to July 2026
784 GWh
Provisional
Range, 2015 to 2025
1.4–1.6
TWh a year. Low 2022, high 2015
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 2,037,717 | Not reported | 12 of 12 |
| 2001 | 1,926,759 | Not reported | 12 of 12 |
| 2002 | 1,986,722 | Not reported | 12 of 12 |
| 2003 | 1,878,863 | Not reported | 12 of 12 |
| 2004 | 1,827,342 | Not reported | 12 of 12 |
| 2005 | 1,643,415 | Not reported | 12 of 12 |
| 2006 | 1,796,696 | Not reported | 12 of 12 |
| 2007 | 1,791,561 | Not reported | 12 of 12 |
| 2008 | 1,711,644 | Not reported | 12 of 12 |
| 2009 | 1,585,967 | Not reported | 12 of 12 |
| 2010 | 1,758,774 | 65.6% | 12 of 12 |
| 2011 | 1,667,562 | 62.2% | 12 of 12 |
| 2012 | 1,778,450 | 66.2% | 12 of 12 |
| 2013 | 1,705,822 | 63.6% | 12 of 12 |
| 2014 | 1,622,311 | 60.5% | 12 of 12 |
| 2015 | 1,637,033 | 61.1% | 12 of 12 |
| 2016 | 1,497,812 | 55.7% | 12 of 12 |
| 2017 | 1,497,071 | 55.8% | 12 of 12 |
| 2018 | 1,606,430 | 59.9% | 12 of 12 |
| 2019 | 1,533,354 | 57.2% | 12 of 12 |
| 2020 | 1,596,088 | 59.4% | 12 of 12 |
| 2021 | 1,489,471 | 55.6% | 12 of 12 |
| 2022 | 1,350,973 | 50.4% | 12 of 12 |
| 2023 | 1,479,885 | 55.2% | 12 of 12 |
| 2024 | 1,548,915 | 57.6% | 12 of 12 |
| 2025 | 1,495,275 | 55.8% | 12 of 12 |
| 2026 (provisional, partial year) | 784,139 | 50.4% | 7 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 account · MISOEmissions
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 |
|---|---|---|---|
| X773 | Natural Gas Fired Combustion Turbine | 102.0 | May 1997 |
| X774 | Natural Gas Fired Combustion Turbine | 102.0 | May 1997 |
| X775 | Natural Gas Fired Combustion Turbine | 102.0 | May 1997 |
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 Westlake Chemicals & Vinyls 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 Westlake Plaquemine
How much power does Westlake Plaquemine produce?
Westlake Plaquemine reported 1,495,275 MWh (1.50 TWh) of net generation in 2025, a 55.8% capacity factor on 306 MW of nameplate capacity. From January to July 2026 it reported 784 GWh, which is provisional.
Where is Westlake Plaquemine?
Westlake Plaquemine is in Iberville Parish, Louisiana, at 30.2586, −91.1850. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates Westlake Plaquemine?
EIA-860M for August 2026 lists Westlake Chemicals & Vinyls LLC as the operator (EIA operator ID 65195). The operator is not always the owner.
When did Westlake Plaquemine start operating?
Its first generator began operating in May 1997, according to EIA-860M.
Does InfraMap have power prices for Westlake Plaquemine?
Yes. InfraMap has MISO day-ahead and real-time prices at 1 price node linked to Westlake Plaquemine, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
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)
- MISO day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page