RS Cogen
Natural gas power plant in Calcasieu Parish, Louisiana. 493 MW of nameplate capacity across 3 generators, operated by Westlake 2 US LLC.
Also known as EIA plant 55117
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Key facts
- Capacity
- 493 MWNameplate
- Generators
- 3 operatingEIA-860M, August 2026
- Operating since
- December 2002First generator online
- Operator
- Westlake 2 US LLCEIA operator ID 14306
- Grid
- MISOBalancing authority MISO
- Price nodes
- 1 MISO nodeResource nodes with prices
- Location
- Calcasieu Parish, LA30.2210, −93.2826
- EIA plant ID
- 55117EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power RS Cogen produces
Free · EIA-923Net generation, 2025
2.73 TWh
2,725,813 MWh, final
Capacity factor, 2025
63.1%
2024: 47.2%
January to July 2026
1.60 TWh
Provisional
Range, 2015 to 2025
1.3–3.1
TWh a year. Low 2020, high 2015
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | 3,047,518 | Not reported | 12 of 12 |
| 2004 | 3,039,435 | Not reported | 12 of 12 |
| 2005 | 2,941,362 | Not reported | 12 of 12 |
| 2006 | 3,311,795 | Not reported | 12 of 12 |
| 2007 | 2,901,752 | Not reported | 12 of 12 |
| 2008 | 2,739,393 | Not reported | 12 of 12 |
| 2009 | 1,511,552 | Not reported | 6 of 12 |
| 2010 | 2,873,118 | 66.5% | 12 of 12 |
| 2011 | 3,037,607 | 70.3% | 12 of 12 |
| 2012 | 3,045,799 | 70.3% | 12 of 12 |
| 2013 | 3,214,979 | Not reported | 12 of 12 |
| 2014 | 1,002,187 | 70.6% | 4 of 12 |
| 2015 | 3,093,987 | 71.6% | 12 of 12 |
| 2016 | 3,062,031 | 70.7% | 12 of 12 |
| 2017 | 2,795,019 | 64.7% | 12 of 12 |
| 2018 | 2,523,096 | 58.4% | 12 of 12 |
| 2019 | 2,913,463 | 67.5% | 12 of 12 |
| 2020 | 1,321,907 | 30.5% | 12 of 12 |
| 2021 | 2,134,282 | 49.4% | 12 of 12 |
| 2022 | 2,697,118 | 62.5% | 12 of 12 |
| 2023 | 2,111,359 | 48.9% | 12 of 12 |
| 2024 | 2,042,544 | 47.2% | 12 of 12 |
| 2025 | 2,725,813 | 63.1% | 12 of 12 |
| 2026 (provisional, partial year) | 1,596,541 | 63.6% | 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 CAMPDCO₂, 2025
1.56M
US short tons. 2024: 1.36M
SO₂, 2025
8
US short tons
NOx, 2025
811
US short tons
CO₂ per MWh, calculated
0.57 t
About 1,145 lb per MWh
2 of 2 EPA units reported CO₂ in 2025 (RS-5, RS-6), matched to EIA plant 55117 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSWithdrawal, 2024
283
million gallons
Consumption, 2024
253
million gallons
Source
Sabine River
Surface, Fresh. Induced-draft tower
Watershed stress
Very low/none · 0.158
USGS SUI, HUC12 Maple Fork-Bayou d'Inde
12 of 12 cooling months report withdrawal. SUI of the HUC12 containing the plant. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| RS-4 | Natural Gas Fired Combined Cycle | 103.0 | December 2002 |
| RS-5 | Natural Gas Fired Combined Cycle | 195.0 | December 2002 |
| RS-6 | Natural Gas Fired Combined Cycle | 195.0 | December 2002 |
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 2 US 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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Power plants near RS Cogen
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Questions about RS Cogen
How much power does RS Cogen produce?
RS Cogen reported 2,725,813 MWh (2.73 TWh) of net generation in 2025, a 63.1% capacity factor on 493 MW of nameplate capacity. From January to July 2026 it reported 1.60 TWh, which is provisional.
Where is RS Cogen?
RS Cogen is in Calcasieu Parish, Louisiana, at 30.2210, −93.2826. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates RS Cogen?
EIA-860M for August 2026 lists Westlake 2 US LLC as the operator (EIA operator ID 14306). The operator is not always the owner.
When did RS Cogen start operating?
Its first generator began operating in December 2002, according to EIA-860M.
Does InfraMap have power prices for RS Cogen?
Yes. InfraMap has MISO day-ahead and real-time prices at 1 price node linked to RS Cogen, 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)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- MISO day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- EIA-923 cooling water 2024 and the USGS surface water supply and use index, Water years 2010-2020 (Oct 2009 to Sep 2020), mean of monthly values
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page