Prairie State Generating Station
Coal power plant in St Clair County, Illinois. 1,766 MW of nameplate capacity across 2 generators, operated by Prairie State Generating Co LLC.
Also known as Prairie State Energy Campus · EIA plant 55856
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Key facts
- Capacity
- 1,766 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- June 2012First generator online
- Operator
- Prairie State Generating Co LLCEIA operator ID 15330
- Grid
- MISOBalancing authority MISO
- Price nodes
- 16 MISO nodesResource nodes with prices
- Location
- St Clair County, IL38.2792, −89.6669
- EIA plant ID
- 55856EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Prairie State produces
Free · EIA-923Net generation, 2025
12.2 TWh
12,192,564 MWh, final
Capacity factor, 2025
78.8%
2024: 73.8%
January to July 2026
7.24 TWh
Provisional
Range, 2015 to 2025
10.6–12.7
TWh a year. Low 2016, high 2021
| 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 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | Not reported | Not reported | 0 of 12 |
| 2010 | Not reported | Not reported | 0 of 12 |
| 2011 | Not reported | Not reported | 0 of 12 |
| 2012 | 3,263,897 | Not reported | 7 of 12 |
| 2013 | 8,350,518 | 54.0% | 12 of 12 |
| 2014 | 9,664,791 | 62.5% | 12 of 12 |
| 2015 | 11,106,837 | 71.8% | 12 of 12 |
| 2016 | 10,619,157 | 68.5% | 12 of 12 |
| 2017 | 10,810,692 | 69.9% | 12 of 12 |
| 2018 | 11,532,418 | 74.5% | 12 of 12 |
| 2019 | 12,053,090 | 77.9% | 12 of 12 |
| 2020 | 11,308,063 | 72.9% | 12 of 12 |
| 2021 | 12,685,744 | 82.0% | 12 of 12 |
| 2022 | 11,608,888 | 75.0% | 12 of 12 |
| 2023 | 12,483,004 | 80.7% | 12 of 12 |
| 2024 | 11,447,748 | 73.8% | 12 of 12 |
| 2025 | 12,192,564 | 78.8% | 12 of 12 |
| 2026 (provisional, partial year) | 7,243,476 | 80.6% | 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
11.92M
US short tons. 2024: 11.05M
SO₂, 2025
9,212
US short tons
NOx, 2025
3,784
US short tons
CO₂ per MWh, calculated
0.98 t
About 1,955 lb per MWh
2 of 2 EPA units reported CO₂ in 2025 (1, 2), matched to EIA plant 55856 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
4,842
million gallons
Consumption, 2024
4,222
million gallons
Source
Kaskaskia River
Surface, Fresh. Induced-draft tower
Watershed stress
Moderate · 0.540
USGS SUI, HUC12 South Fork Mud Creek-Mud Creek
24 of 24 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 |
|---|---|---|---|
| PC1 | Conventional Steam Coal | 883.0 | June 2012 |
| PC2 | Conventional Steam Coal | 883.0 | November 2012 |
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 Prairie State Generating Co 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 Prairie State
How much power does Prairie State Generating Station produce?
Prairie State Generating Station reported 12,192,564 MWh (12.2 TWh) of net generation in 2025, a 78.8% capacity factor on 1,766 MW of nameplate capacity. From January to July 2026 it reported 7.24 TWh, which is provisional.
Where is Prairie State Generating Station?
Prairie State Generating Station is in St Clair County, Illinois, at 38.2792, −89.6669. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates Prairie State Generating Station?
EIA-860M for August 2026 lists Prairie State Generating Co LLC as the operator (EIA operator ID 15330). The operator is not always the owner.
When did Prairie State Generating Station start operating?
Its first generator began operating in June 2012, according to EIA-860M.
Does InfraMap have power prices for Prairie State Generating Station?
Yes. InfraMap has MISO day-ahead and real-time prices at 16 price nodes linked to Prairie State Generating Station, 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
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page