GRAND TOWER
OperatingNatural Gas power plant
- Capacity
- 647 MW
- Primary fuel
- Natural Gas
- County
- Jackson County
- Operator
- AMEREN ENERGY GENERATING CO
- Status
- Operating
- EIA plant ID
- 862
- Coordinates
- 37.6577, -89.5115
GRAND TOWER, a 647 MW Natural Gas power plant in Jackson County, Illinois. Operated by AMEREN ENERGY GENERATING CO.
Weather peril exposure
GRAND TOWER is a 647 MW natural gas power plant in Jackson County, IL, operated by AMEREN ENERGY GENERATING CO. Jackson County carries high modeled catastrophe exposure in the FEMA National Risk Index, scoring 3.7 of 5 at the 67th national percentile. Strong wind is the leading peril, rated Very High by FEMA at the 99th percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a natural gas plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Jackson County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Strong wind | Very High | 99th | 5.0 of 5 | 4.6 |
| Earthquake | Relatively Moderate | 96th | 4.8 of 5 | <0.01 |
| Winter weather | Relatively High | 93rd | 4.7 of 5 | 8.1 |
| Ice storm | Relatively Moderate | 73rd | 3.9 of 5 | 0.67 |
| Hail | Relatively Moderate | 66th | 3.6 of 5 | 3.8 |
| Riverine flooding | Relatively Moderate | 64th | 3.6 of 5 | 6.1 |
| Tornado | Relatively Moderate | 51st | 3.0 of 5 | 0.51 |
| Heat wave | Relatively Moderate | 49th | 2.9 of 5 | 10.6 |
| Hurricane | Very Low | 30th | 2.2 of 5 | 0.02 |
| Wildfire | Very Low | 26th | 2.0 of 5 | <0.01 |
| Lightning | Relatively Moderate | 22nd | 1.9 of 5 | 53.7 |
Perils not assessed in Jackson 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 Jackson 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.