Callaway
Callaway is a nuclear plant in Callaway County, Missouri, operated by Union Electric Co (MO). It ranks fourth by nameplate capacity among Missouri’s 137 power plants. Its biggest unit, rated at 1,236 MW, is the largest single generator in Missouri.
Nameplate capacity, 2025
1,236 MW
1,190 MW net summer capacity
1 operable unit
- Nuclear1,236 MW100%
Unit by unit, 1984 to 2025
operating in 2025bar height follows unit size
Unit 1 Nuclear, 1,236 MW, 1984
Among Missouri’s plants
Largest plants in the state by nameplate capacity, with the plants ranked next to this one.
- 1Labadie2,389 MW
- 2Iatan1,754 MW
- 3New Madrid1,300 MW
- 4Callawaythis plant
- 5Thomas Hill1,182 MW
- 6Sioux1,099 MW
Other rankings
- All US power plants
- 210th of 14,286
- US nuclear plants
- 41st of 56
- Plants in the MISO (Midcontinent) balancing area
- 30th of 2,383
- Plants run by Union Electric Co (MO)
- 2nd of 28
Operable units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Nuclear | 1,236 MW | 1,190 MW | 1984 | Operating |
Grid and site
- Balancing area
- MISO (Midcontinent)
- Reliability region
- SERC Reliability Corporation
- Highest grid connection voltage
- 345 kV
- Water source
- Missouri River
- Nearest town on record
- Fulton
- Operator type
- Utility
- Coordinates
- 38.759°N, 91.779°W
Closest plants
| Plant | Runs on | Capacity | Distance |
|---|---|---|---|
| Fulton (MO) | Natural gas | 33.2 MW | 11.8 mi northwest |
| Ameresco Jefferson City | Biomass and waste | 3 MW | 20.2 mi southwest |
| Montgomery County Community Solar Center | Solar | 5.7 MW | 21.2 mi northeast |
| Moreau | Oil and petroleum | 60.8 MW | 22.4 mi southwest |
| Fairgrounds | Oil and petroleum | 68.3 MW | 26.4 mi southwest |
| Mexico | Oil and petroleum | 60.7 MW | 27.0 mi north |
| Envoy Solar, LLC | Solar | 50 MW | 27.7 mi north |
| Truman Solar | Solar | 10 MW | 28.4 mi northwest |