Marengo Battery Storage LLCOut of service
McHenry County, Illinois · EIA plant ID 62856 · Operator: Marengo Battery Storage LLC
Nameplate20MWSummer 20 MW
Generators1in service
Net generation—GWh12 mo
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
First online2018
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), primary-fuel units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
No capacity factor available.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2019 | -1.5 | — | — |
| 2020 | -0.4 | — | — |
| 2021 | -4.4 | — | — |
| 2022 | -1.3 | — | — |
| 2023 | -0.6 | — | — |
| 2024 | -0.6 | — | — |
| 2025 | -0.2 | — | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| MBSS | Batteries | BA | 20 | 20 | Dec 2018 | Operating (Out of service) | — | coming soon |
Owner / operator
Operator: Marengo Battery Storage LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Marengo Battery Storage LLC | 100.0% | 20 MW |
Nearby plants
Within 80 km.
| Marengo Solar | 2 MW | 0.8 km |
| Grant | 2 MW | 3.2 km |
| Lafayette 2 - McHenry Franks 1 | 2 MW | 3.6 km |
| SV CSG Garden Prairie 1, LLC | 2 MW | 8.8 km |
| SV CSG Garden Prairie 2, LLC | 2 MW | 9 km |
| Lafayette 2 - McHenry Franks 2 | 2 MW | 12.9 km |