SIOUX
OperatingCoal power plant
- Capacity
- 1,099 MW
- Primary fuel
- Coal
- County
- St. Charles County
- Operator
- UNION ELECTRIC CO - (MO)
- Status
- Operating
- Commissioned
- 1967
- EIA plant ID
- 2107
- Coordinates
- 38.9153, -90.2913
SIOUX, a 1,099 MW Coal power plant in St. Charles County, Missouri. Operated by UNION ELECTRIC CO - (MO), commissioned 1967.
Weather peril exposure
SIOUX is a 1,099 MW coal power plant in St. Charles County, MO, operated by UNION ELECTRIC CO - (MO), commissioned in 1967. St. Charles County carries critical modeled catastrophe exposure in the FEMA National Risk Index, scoring 4.2 of 5 at the 80th national percentile. Earthquake is the leading peril, rated Relatively Moderate by FEMA at the 87th percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a coal plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
St. Charles County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Earthquake | Relatively Moderate | 87th | 4.5 of 5 | <0.01 |
| Riverine flooding | Relatively High | 84th | 4.4 of 5 | 2.1 |
| Hail | Relatively High | 84th | 4.3 of 5 | 5.3 |
| Tornado | Relatively High | 62nd | 3.5 of 5 | 0.46 |
| Heat wave | Relatively Moderate | 59th | 3.4 of 5 | 14.7 |
| Lightning | Relatively High | 59th | 3.4 of 5 | 51.0 |
| Winter weather | Relatively High | 59th | 3.3 of 5 | 8.8 |
| Ice storm | Relatively Moderate | 39th | 2.5 of 5 | 1.3 |
| Wildfire | Very Low | 38th | 2.5 of 5 | <0.01 |
| Strong wind | Very High | 38th | 2.5 of 5 | 5.9 |
| Hurricane | Very Low | 5th | 1.2 of 5 | <0.01 |
Perils not assessed in St. Charles County
These perils carry no usable National Risk Index figure for this county, so they are excluded from the scoring rather than scored zero. A zero would claim the peril was assessed and found benign.
| Peril | Why it is not scored |
|---|---|
| Coastal flooding | FEMA rating is "Not Applicable" for this county |
Model hail, wind and flood exposure for St. Charles County in the weather risk calculator
Ratings are the FEMA National Risk Index county hazard ratings; the peril score is a Bywatts transform of the FEMA national percentile. Full data sources and the solar vulnerability methodology are in the weather risk calculator.
Modeled estimate for screening and negotiation. Built from FEMA National Risk Index county hazard data and a solar vulnerability layer documented above. Not a quote, a binder, or actuarial advice, and not a substitute for a carrier's own model. Hazard data: FEMA National Risk Index December 2025, synced 2026-07-24. Resolution is county level, not site level.