Charter Dura-Bar
McHenry County, Illinois · EIA plant ID 54540 · Operator: Wells Manufacturing Co
Nameplate6MWSummer 5 MW
Generators6in service
Net generation8GWh12 mo to Aug 2026
Capacity factor17%gas/coal/oil units, summer MW
Heat rate17,189Btu/kWhfossil units, electric fuel, HHV
First online1992Runs as peaking
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
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), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 0.2 | 0.4% | 12,748 |
| 2002 | 0.1 | 0.3% | 12,709 |
| 2003 | 0.2 | 0.4% | 12,976 |
| 2004 | 0.2 | 0.4% | 8,744 |
| 2005 | 0.1 | 0.3% | 11,232 |
| 2006 | 0.6 | 1.2% | 8,623 |
| 2007 | 2.1 | 4.5% | 10,513 |
| 2008 | 0.9 | 1.8% | 13,027 |
| 2009 | 0.2 | 0.5% | 11,894 |
| 2010 | 4.8 | 10.1% | 11,227 |
| 2011 | 10.7 | 22.6% | 15,155 |
| 2012 | 6.3 | 13.2% | 8,043 |
| 2013 | 2.3 | 4.9% | 11,659 |
| 2014 | 6.1 | 12.9% | 20,211 |
| 2015 | 3 | 6.4% | 21,787 |
| 2017 | 0.4 | 0.8% | — |
| 2018 | 0 | 0.0% | — |
| 2019 | 5 | 10.5% | 20,204 |
| 2020 | 6.7 | 14.2% | 20,646 |
| 2021 | 5.6 | 11.8% | 21,648 |
| 2022 | 8.9 | 18.9% | 15,638 |
| 2023 | 8.6 | 18.1% | 17,714 |
| 2024 | 8.6 | 18.2% | 16,278 |
| 2025 | 8 | 16.9% | 17,076 |
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 |
|---|---|---|---|---|---|---|---|---|
| 1A | Natural Gas Internal Combustion Engine | IC | 1 | 0.9 | Apr 1992 | Operating | — | coming soon |
| 1B | Natural Gas Internal Combustion Engine | IC | 1 | 0.9 | Apr 1992 | Operating | — | coming soon |
| 2A | Natural Gas Internal Combustion Engine | IC | 1 | 0.9 | Apr 1992 | Operating | — | coming soon |
| 2B | Natural Gas Internal Combustion Engine | IC | 1 | 0.9 | Apr 1992 | Operating | — | coming soon |
| 3A | Natural Gas Internal Combustion Engine | IC | 1 | 0.9 | Apr 1992 | Operating | — | coming soon |
| 3B | Natural Gas Internal Combustion Engine | IC | 1 | 0.9 | Apr 1992 | Operating | — | coming soon |
Owner / operator
Operator: Wells Manufacturing Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Wells Manufacturing Co | 100.0% | 6 MW |
Nearby plants
Within 80 km.
| Charter Durabar at Woodstock | 2 MW | 0.5 km |
| OER IL - Groundhog | 2 MW | 2.2 km |
| Lilly Pond Road Solar 1, LLC | 2 MW | 2.6 km |
| Osman Trust | — | 4.1 km |
| Pivot Energy IL 52 | — | 4.5 km |
| Armstrong 1 | 2 MW | 8.5 km |