Nameplate capacity
18 MW
Rank in Iowa
#138
of 305 plants
In service since
1956
July 1956
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Internal Combustion Engine
- Operator
- City of Winterset - (IA)
- County
- Madison County
- Generating units
- 8
- Share of state capacity
- 0.07%
- Rank among natural gas plants in Iowa
- #26 of 42
- EIA plant code
- 1203
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 4 | Natural Gas Internal Combustion Engine | 4.4 MW | 4.4 MW | 1972 | Operating |
| 5 | Petroleum Liquids | 2.0 MW | 2.0 MW | 2002 | Operating |
| 6 | Petroleum Liquids | 2.0 MW | 2.0 MW | 2002 | Operating |
| 7 | Petroleum Liquids | 2.0 MW | 2.0 MW | 2002 | Operating |
| 8 | Petroleum Liquids | 2.0 MW | 2.0 MW | 2022 | Operating |
| 9 | Petroleum Liquids | 2.0 MW | 2.0 MW | 2022 | Operating |
| 3 | Natural Gas Internal Combustion Engine | 1.7 MW | 1.7 MW | 1966 | Operating |
| 2 | Natural Gas Internal Combustion Engine | 1.5 MW | 1.5 MW | 1956 | 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 Iowa
| Waterloo Lundquist | Other | 18 MW |
| Lake Mills | Other | 18 MW |
| Vinton | Natural gas | 18 MW |
| Algona | Other | 16 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 18 MW solar plant and a 18 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 Iowa power plants · What Iowa actually generates