Knoxville Battery Energy Storage
Battery storage power plant · Marion County, Iowa
Nameplate capacity
1.1 MW
Rank in Iowa
#301
of 305 plants
In service since
2018
December 2018
Details
- Primary fuel
- Battery storage
- Technology
- Batteries
- Operator
- MidAmerican Energy Co
- County
- Marion County
- Generating units
- 1
- Share of state capacity
- 0.00%
- Rank among battery storage plants in Iowa
- #4 of 4
- EIA plant code
- 62569
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| ES1 | Batteries | 1.1 MW | 1.1 MW | 2018 | 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
| Strawberry Point DPC Solar | Solar | 1.3 MW |
| Iowa Hydro LLC | Hydro | 1.2 MW |
| Sibley No Two | Other | 1.1 MW |
| AgriReNew | Other | 1.0 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 1.1 MW solar plant and a 1.1 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