Power plants in St Clair County, Illinois
14 operating power plants in St Clair County, Illinois, with 1,806 MW of nameplate capacity, largest first. From EIA-860M, August 2026.
Plants
14
Nameplate capacity
1,806 MW
Net generation, 2025
12.2 TWh
9 of 14 plants reported
Largest power plants in St Clair County
| # | Plant | MW | GWh, 2025 | Capacity factor |
|---|---|---|---|---|
| 1 | Prairie State Generating StationCoal | 1,766 | 12,193 | 78.8% |
| 2 | AES Belleville Solar LLCSolar | 9.9 | 5.9 | 6.8% |
| 3 | St. Clair Solar 5Solar | 5.0 | 1.5 | – |
| 4 | South Belleville Solar, LLCSolar | 5.0 | 0.4 | – |
| 5 | Millstadt IL 1, LLCSolar | 2.5 | 2.3 | – |
| 6 | Milam Gas RecoveryNatural gas | 2.4 | 19.4 | 92.1% |
| 7 | Schmidt CSG 1Solar | 2.0 | 4.2 | 24.2% |
| 8 | St. Clair Solar 3Solar | 2.0 | 3.5 | 20.0% |
| 9 | SV CSG Reifschneider II B, LLCSolar | 2.0 | – | – |
| 10 | SV CSG Reifschneider III A, LLCSolar | 2.0 | – | – |
| 11 | SV CSG Reifschneider I B, LLCSolar | 2.0 | – | – |
| 12 | SV CSG Reifschneider II A, LLCSolar | 2.0 | – | – |
| 13 | SCS American Bottoms 009885 Sauget, LLCSolar | 1.8 | 1.9 | 12.1% |
| 14 | SV CSG Reifschneider I A, LLCSolar | 1.0 | – | – |
MW is the nameplate capacity of operating generators and batteries. Source: EIA-860M August 2026, published 2026-09-24, and EIA-923 2025. Page updated 2026-10-04. Data sources
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