Marengo Battery Storage LLC
Battery storage power plant · McHenry County, Illinois · not currently in service
Details
- Primary fuel
- Battery storage
- Technology
- Batteries
- Operator
- Marengo Battery Storage LLC
- County
- McHenry County
- Generating units
- 1
- Share of state capacity
- 0.04%
- Rank among battery storage plants in Illinois
- #2 of 3
- EIA plant code
- 62856
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| MBSS | Batteries | 20 MW | 20 MW | 2018 | Out of service and NOT expected to return to service in next calendar year |
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 Illinois
| DePue Holdings, LLC | Solar | 20 MW |
| Grand Ridge Solar Farm | Solar | 20 MW |
| McHenry Battery Storage | Battery storage | 20 MW |
| Archer Daniels Midland Peoria | Natural gas | 18 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 20 MW solar plant and a 20 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 Illinois power plants · What Illinois actually generates