CALLAWAY
OperatingNuclear power plant
- Capacity
- 1,236 MW
- Primary fuel
- Nuclear
- County
- Callaway County
- Operator
- UNION ELECTRIC CO - (MO)
- Status
- Operating
- Commissioned
- 1984
- EIA plant ID
- 6153
- Generators
- 1
- Technology
- Nuclear
- Net generation (2024)
- 10,526 GWh
- Capacity factor (2024, EIA nameplate)
- 97%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 38.7608, -91.7817
CALLAWAY, a 1,236 MW Nuclear power plant in Callaway County, Missouri. Operated by UNION ELECTRIC CO - (MO), commissioned 1984.
How CALLAWAY compares
With 1,236 MW of capacity, CALLAWAY ranks 4th among the 92 operating power plants Bywatts maps in Missouri. It accounts for about 6.4% of all operating capacity in Missouri. Nationally it is the 40th-largest of the 55 operating Nuclear plants in the database. Commissioned in 1984, it is newer than 57% of the 89 operating Missouri plants with a recorded commissioning year. Its operator, UNION ELECTRIC CO - (MO), runs 11 operating plants in Missouri totaling 6,645 MW. It shares Callaway County with one other operating plant, FULTON.
EIA-860 lists 1 generator at the site with 1,236 MW of nameplate capacity, all nuclear technology. Net generation was 10,526 GWh in 2024 (a 97% capacity factor), up 19% from 2022.
Grid neighborhood
The nearest named substation is CALLAWAY (345 kV), about 0.2 miles away; the closest transmission line found within 10 miles is a 345 kV line owned by UNION ELECTRIC CO - (MO), under 0.1 miles away. Another 3 operating power plants totaling 102 MW sit within 25 miles; the largest is MOREAU (61 MW, Oil).
Computed by Bywatts from HIFLD power plant, substation and transmission line records and EIA-860/923 survey data; distances are straight-line. Sources and methodology
Weather peril exposure
CALLAWAY is a 1,236 MW nuclear power plant in Callaway County, MO, operated by UNION ELECTRIC CO - (MO), commissioned in 1984. Callaway County carries elevated modeled catastrophe exposure in the FEMA National Risk Index, scoring 3.4 of 5 at the 60th national percentile. Winter weather is the leading peril, rated Relatively Moderate by FEMA at the 81st 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.
Callaway County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Winter weather | Relatively Moderate | 81st | 4.3 of 5 | 9.4 |
| Earthquake | Relatively Low | 77th | 4.1 of 5 | <0.01 |
| Ice storm | Relatively Moderate | 74th | 4.0 of 5 | 1.0 |
| Riverine flooding | Relatively Low | 72nd | 3.9 of 5 | 1.5 |
| Hail | Relatively Low | 68th | 3.7 of 5 | 4.5 |
| Wildfire | Relatively Low | 48th | 2.9 of 5 | <0.01 |
| Tornado | Relatively Low | 40th | 2.6 of 5 | 0.43 |
| Lightning | Relatively Moderate | 39th | 2.6 of 5 | 50.7 |
| Strong wind | Relatively Moderate | 27th | 2.1 of 5 | 4.0 |
| Heat wave | Relatively Moderate | 20th | 1.8 of 5 | 11.9 |
| Hurricane | Very Low | 10th | 1.4 of 5 | <0.01 |
Perils not assessed in Callaway 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 Callaway 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.