Nameplate capacity
1,236 MW
Rank in Missouri
#4
of 139 plants
In service since
1984
December 1984
Details
- Primary fuel
- Nuclear
- Technology
- Nuclear
- Operator
- Union Electric Co - (MO)
- County
- Callaway County
- Generating units
- 1
- Share of state capacity
- 5.28%
- Rank among nuclear plants in Missouri
- #1 of 1
- EIA plant code
- 6153
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Nuclear | 1,236 MW | 1,190 MW | 1984 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Missouri
| Iatan | Coal | 1,754 MW |
| New Madrid | Coal | 1,300 MW |
| Thomas Hill | Coal | 1,182 MW |
| Sioux | Coal | 1,099 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 1,236 MW solar plant and a 1,236 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Missouri power plants · What Missouri actually generates