SiouxRetirement planned
St. Charles County, Missouri · EIA plant ID 2107 · Operator: Union Electric Co - (MO)
Nameplate1,099MWSummer 974 MW
Generators2in service
Net generation3,643GWh12 mo to Aug 2026
Capacity factor43%gas/coal/oil units, summer MW
Heat rate10,582Btu/kWhfossil units, electric fuel, HHV
First online1967Runs 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) |
|---|---|---|---|
| 2001 | 5,645.8 | 67.2% | 10,110 |
| 2002 | 6,296.7 | 75.1% | 9,943 |
| 2003 | 6,332.8 | 73.2% | 9,563 |
| 2004 | 6,226 | 72.0% | 9,981 |
| 2005 | 6,636.5 | 76.0% | 9,990 |
| 2006 | 6,398.4 | 73.4% | 9,705 |
| 2007 | 6,643.3 | 76.3% | 9,976 |
| 2008 | 5,848.6 | 67.0% | 10,083 |
| 2009 | 5,760.5 | 66.7% | 10,342 |
| 2010 | 5,733 | 66.4% | 10,347 |
| 2011 | 5,209.9 | 61.3% | 10,308 |
| 2012 | 4,905.6 | 57.8% | 10,319 |
| 2013 | 5,080.4 | 59.5% | 10,625 |
| 2014 | 4,964.3 | 58.2% | 11,019 |
| 2015 | 4,495.4 | 52.8% | 11,378 |
| 2016 | 4,549.2 | 53.3% | 11,517 |
| 2017 | 4,978.1 | 58.6% | 11,252 |
| 2018 | 5,664.9 | 66.4% | 11,116 |
| 2019 | 3,885.6 | 45.5% | 11,541 |
| 2020 | 2,749.4 | 30.0% | 12,912 |
| 2021 | 3,886.9 | 45.6% | 11,878 |
| 2022 | 3,665.8 | 43.0% | 10,183 |
| 2023 | 3,050.5 | 35.8% | 10,430 |
| 2024 | 3,337.6 | 39.0% | 10,404 |
| 2025 | 3,986.4 | 46.7% | 10,176 |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Steam Coal | ST | 549.7 | 487 | May 1967 | Operating · retirement planned | Dec 2028 | coming soon |
| 2 | Conventional Steam Coal | ST | 549.7 | 487 | May 1968 | Operating · retirement planned | Dec 2028 | coming soon |
Owner / operator
Operator: Union Electric Co - (MO). Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Union Electric Co - (MO) | 100.0% | 1,099 MW |
Nearby plants
Within 80 km.
| IL - Ameresco - Alton | 5 MW | 9.8 km |
| Hibiscus Solar, LLC | — | 21.3 km |
| Big Creek Solar (IL) (CSG) | 5 MW | 21.6 km |
| SV CSG Roxana 1 | — | 23.6 km |
| SV CSG South Roxana | — | 23.7 km |
| Granite City Solar | 4 MW | 23.9 km |