Marengo Battery Storage LLC
Marengo Battery Storage LLC is a 20 MW battery storage project in McHenry County, Illinois, operated by Marengo Battery Storage LLC. EIA-860M lists 1 generating unit here, inside PJM. Its unit entered service in 2018.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Nameplate capacity
- 20 MW
- 20 MW net summer
- Generating units
- 1
- In service
- 2018
- EIA plant ID
- 62856
Where it is
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- County
- McHenry County, Illinois
- Coordinates
- 42.2527, -88.64
- Balancing authority
- PJM
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- Marengo Battery Storage LLC
- Primary energy source
- Battery
- Technologies
- Batteries
- Status
- Out of service and NOT expected to return to service in next calendar year
Marengo Battery Storage LLC: FAQ
- Where is Marengo Battery Storage LLC?
- In McHenry County, Illinois (IL). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
- How big is Marengo Battery Storage LLC?
- 20 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns Marengo Battery Storage LLC?
- EIA-860M names Marengo Battery Storage LLC as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is Marengo Battery Storage LLC still running?
- EIA-860M files it as "Out of service and NOT expected to return to service in next calendar year" for 2026-07. Statuses change monthly, and this page follows the monthly release.