GSG LLC
Lee County, Illinois · EIA plant ID 56450 · Operator: Leeward Asset Management, LLC
Nameplate80MWSummer 80 MW
Generators1in service
Net generation312GWh12 mo to Dec 2025
Capacity factor45%wind units, summer MW
Heat rate—thermal plants only
First online2007
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), wind 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.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2007 | 57.3 | 14.0% | — |
| 2008 | 225.2 | 32.0% | — |
| 2009 | 204.9 | 29.2% | — |
| 2010 | 190.5 | 27.2% | — |
| 2011 | 181.4 | 25.9% | — |
| 2012 | 183.2 | 26.1% | — |
| 2013 | 153.4 | 21.9% | — |
| 2014 | 146.7 | 20.9% | — |
| 2015 | 183.6 | 26.2% | — |
| 2016 | 198.8 | 28.3% | — |
| 2017 | 220.9 | 31.5% | — |
| 2018 | 195.2 | 27.9% | — |
| 2019 | 202.3 | 28.9% | — |
| 2020 | 187.8 | 26.7% | — |
| 2021 | 102.2 | 14.6% | — |
| 2022 | 222.5 | 31.8% | — |
| 2023 | 92.5 | 13.2% | — |
| 2024 | 298.7 | 42.5% | — |
| 2025 | 312.3 | 44.6% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Onshore Wind Turbine | WT | 80 | 80 | Jun 2007 | Operating | — | gamesa G87-2.0 |
Owner / operator
Operator: Leeward Asset Management, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Leeward Asset Management, LLC | 100.0% | 80 MW |
Nearby plants
Within 80 km.
| Com Adam 1WF-1 | 5 MW | 6.6 km |
| Shady Oaks Wind 2 | 108 MW | 9.7 km |
| Shady Oaks Wind Farm | 110 MW | 9.8 km |
| Mendota | 2 MW | 10.6 km |
| Mendota Rich Dev CSG | 2 MW | 11.6 km |
| Mendota Hills, LLC | 76 MW | 13.3 km |