Nameplate capacity
3.2 MW
Rank in Iowa
#223
of 305 plants
In service since
1931
August 1931
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Ottumwa City of
- County
- Wapello County
- Generating units
- 3
- Share of state capacity
- 0.01%
- Rank among hydro plants in Iowa
- #3 of 4
- EIA plant code
- 1173
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 2 | Conventional Hydroelectric | 1.2 MW | 1.2 MW | 1931 | Operating |
| 1 | Conventional Hydroelectric | 1.0 MW | 1.0 MW | 1931 | Out of service and NOT expected to return to service in next calendar year |
| 3 | Conventional Hydroelectric | 1.0 MW | 1.0 MW | 1931 | 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
| Harlan | Other | 3.4 MW |
| Indianola Solar | Solar | 3.4 MW |
| Graettinger | Other | 3.1 MW |
| Forest City Solar | Solar | 3.0 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 3.2 MW solar plant and a 3.2 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