Prairie State Generating Station
St. Clair County, Illinois · EIA plant ID 55856 · Operator: Prairie State Generating Co LLC
Nameplate1,766MWSummer 1,630 MW
Generators2in service
Net generation12,167GWh12 mo to Aug 2026
Capacity factor85%gas/coal/oil units, summer MW
Heat rate9,453Btu/kWhfossil units, electric fuel, HHV
First online2012Runs 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) |
|---|---|---|---|
| 2012 | 3,263.9 | 60.8% | 9,582 |
| 2013 | 8,350.5 | 58.6% | 9,819 |
| 2014 | 9,664.8 | 67.8% | 9,472 |
| 2015 | 11,106.8 | 77.9% | 9,312 |
| 2016 | 10,619.2 | 74.3% | 9,374 |
| 2017 | 10,810.7 | 76.0% | 9,295 |
| 2018 | 11,532.4 | 80.8% | 9,402 |
| 2019 | 12,053.1 | 84.4% | 9,592 |
| 2020 | 11,308.1 | 79.0% | 9,432 |
| 2021 | 12,685.7 | 88.8% | 9,573 |
| 2022 | 11,608.9 | 81.3% | 9,412 |
| 2023 | 12,483 | 87.4% | 9,510 |
| 2024 | 11,447.7 | 80.0% | 9,585 |
| 2025 | 12,192.6 | 85.4% | 9,434 |
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 |
|---|---|---|---|---|---|---|---|---|
| PC1 | Conventional Steam Coal | ST | 883 | 815 | Jun 2012 | Operating | — | coming soon |
| PC2 | Conventional Steam Coal | ST | 883 | 815 | Nov 2012 | Operating | — | coming soon |
Owner / operator
Operator: Prairie State Generating Co LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| American Mun Power-Ohio, Inc | 23.3% | 411 MW |
| Illinois Municipal Elec Agency (IL) | 15.2% | 268 MW |
| Indiana Municipal Power Agency | 12.6% | 223 MW |
| Missouri Jnt Muni.Pwr Elec. Ut. Comm. | 12.3% | 218 MW |
| Prairie Power Inc | 8.2% | 145 MW |
| Southern Illinois Power Coop | 7.9% | 140 MW |
| Kentucky Municipal Power Agency | 7.8% | 138 MW |
| Northern Illinois Municipal Power Agency | 7.6% | 134 MW |
| Wabash Valley Power Assn, Inc | 2.5% | 45 MW |
| Lively Grove Energy Partners LLC | 2.5% | 45 MW |
Nearby plants
Within 80 km.
| Bee Hollow Solar, LLC | — | 8.7 km |
| Tilden Solar | 150 MW | 10 km |
| Prairie State Solar Project | 99 MW | 11 km |
| SV CSG Wagner A LLC | 2 MW | 13.5 km |
| Great Plains Solar, LLC | — | 15 km |
| Snapdragon Solar, LLC | — | 15.7 km |