Power plants operated by Union Electric Co (MO)
Union Electric Co (MO) operates 28 power plants in the 2025 EIA-860 data, with 10.5 GW of nameplate capacity, the 21st-largest fleet among the 5,826 operators on file. They are spread over three states: Missouri, Illinois and Iowa. Coal is 33% of the capacity; the largest site is Labadie. Its oldest working unit dates from 1913, at Keokuk. Units added from 2020 to 2025 total 1,306 MW.
- Coal3,489 MW33%
- Natural gas3,430 MW33%
- Nuclear1,236 MW12%
- Wind699 MW6.7%
- Solar613 MW5.9%
- Pumped-storage hydro408 MW3.9%
- Hydroelectric333 MW3.2%
- Oil and petroleum250 MW2.4%
Capacity by decade it came online
NuclearCoalNatural gasOil and petroleumHydroelectricPumped-storage hydroWindSolar
Above the line: capacity operating in 2025. Below: capacity retired at these plants.
Plants
| Plant | State | Runs on | Capacity | First unit |
|---|---|---|---|---|
| Labadie | Missouri | Coal | 2,389 MW | 1970 |
| Callaway | Missouri | Nuclear | 1,236 MW | 1984 |
| Sioux | Missouri | Coal | 1,099 MW | 1967 |
| Audrain Generating Station | Missouri | Natural gas | 814 MW | 2001 |
| Goose Creek Energy Center | Illinois | Natural gas | 684 MW | 2003 |
| Venice | Illinois | Natural gas | 586 MW | 2002 |
| Raccoon Creek Energy Center | Illinois | Natural gas | 456 MW | 2002 |
| Taum Sauk | Missouri | Pumped-storage hydro | 408 MW | 1963 |
| High Prairie Wind Farm | Missouri | Wind | 400 MW | 2020 |
| Pinckneyville | Illinois | Natural gas | 380 MW | 2000 |
| Atchison County Wind | Missouri | Wind | 299 MW | 2021 |
| Kinmundy | Illinois | Natural gas | 270 MW | 2001 |
| Peno Creek | Missouri | Natural gas | 240 MW | 2002 |
| Osage Dam | Missouri | Hydroelectric | 208 MW | 1931 |
| Huck Finn Renewable Energy Center | Missouri | Solar | 200 MW | 2024 |
| Boomtown Renewable Energy Center | Illinois | Solar | 150 MW | 2024 |
| Cass County Renewable Energy Center | Illinois | Solar | 150 MW | 2024 |
| Keokuk | Iowa | Hydroelectric | 125 MW | 1913 |
| Fairgrounds | Missouri | Oil and petroleum | 68.3 MW | 1974 |
| Moreau | Missouri | Oil and petroleum | 60.8 MW | 1978 |
| Mexico | Missouri | Oil and petroleum | 60.7 MW | 1978 |
| Moberly | Missouri | Oil and petroleum | 60.6 MW | 1978 |
| Bowling Green Renewable Energy Center | Missouri | Solar | 50 MW | 2025 |
| Vandalia Renewable Energy Center | Missouri | Solar | 50 MW | 2025 |
| Montgomery County Community Solar Center | Missouri | Solar | 5.7 MW | 2022 |
| O’Fallon Renewable Energy Center | Missouri | Solar | 4.5 MW | 2014 |
| Renewable Energy Center at BJH | Missouri | Solar | 1.6 MW | 2019 |
| Cape Girardeau Renewable Energy Center | Missouri | Solar | 1.2 MW | 2021 |