Elmore BESS
Battery storage power plant · Elmore County, Idaho
Nameplate capacity
4.0 MW
Rank in Idaho
#113
of 155 plants
In service since
2025
March 2025
Details
- Primary fuel
- Battery storage
- Technology
- Batteries
- Operator
- Idaho Power Co
- County
- Elmore County
- Generating units
- 1
- Share of state capacity
- 0.06%
- Rank among battery storage plants in Idaho
- #6 of 9
- EIA plant code
- 66327
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Batteries | 4.0 MW | 4.0 MW | 2025 | 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 Idaho
| Island Park | Hydro | 4.8 MW |
| Barber Dam | Hydro | 4.1 MW |
| Milner Butte LFGE | Other | 3.9 MW |
| Moyie Springs | Hydro | 3.9 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 4.0 MW solar plant and a 4.0 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 Idaho power plants · What Idaho actually generates