GRAND GULF
OperatingNuclear power plant
- Capacity
- 1,440 MW
- Primary fuel
- Nuclear
- County
- Claiborne County
- Operator
- SYSTEM ENERGY RESOURCES, INC
- Status
- Operating
- Commissioned
- 1985
- EIA plant ID
- 6072
- Coordinates
- 32.0076, -91.0479
GRAND GULF, a 1,440 MW Nuclear power plant in Claiborne County, Mississippi. Operated by SYSTEM ENERGY RESOURCES, INC, commissioned 1985.
Weather peril exposure
GRAND GULF is a 1,440 MW nuclear power plant in Claiborne County, MS, operated by SYSTEM ENERGY RESOURCES, INC, commissioned in 1985. Claiborne County carries critical modeled catastrophe exposure in the FEMA National Risk Index, scoring 4.7 of 5 at the 92nd national percentile. Tornado is the leading peril, rated Relatively Moderate by FEMA at the 96th percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a nuclear plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Claiborne County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Tornado | Relatively Moderate | 96th | 4.8 of 5 | 0.57 |
| Hail | Relatively Low | 92nd | 4.7 of 5 | 3.8 |
| Hurricane | Relatively Low | 80th | 4.2 of 5 | 0.09 |
| Ice storm | Relatively Low | 78th | 4.1 of 5 | 0.99 |
| Strong wind | Relatively Low | 75th | 4.0 of 5 | 3.3 |
| Lightning | Relatively Low | 75th | 4.0 of 5 | 71.2 |
| Heat wave | Relatively Low | 57th | 3.3 of 5 | 16.8 |
| Riverine flooding | Very Low | 55th | 3.2 of 5 | 0.64 |
| Earthquake | Very Low | 50th | 3.0 of 5 | <0.01 |
| Wildfire | Very Low | 42nd | 2.7 of 5 | <0.01 |
| Winter weather | Very Low | 41st | 2.6 of 5 | 2.5 |
Perils not assessed in Claiborne 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 Claiborne 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.