NRG Rockford II Energy Center
Winnebago County, Illinois · EIA plant ID 55936 · Operator: Rockford Generation LLC
Nameplate168MWSummer 181 MW
Generators1in service
Net generation56GWh12 mo to Dec 2025
Capacity factor4%gas/coal/oil units, summer MW
Heat rate10,024Btu/kWhfossil units, electric fuel, HHV
First online2002Runs as peaking
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) |
|---|---|---|---|
| 2002 | 0 | 0.0% | — |
| 2003 | 3 | 0.2% | 10,192 |
| 2004 | 6.3 | 0.4% | 9,984 |
| 2005 | 43.1 | 3.1% | 10,003 |
| 2006 | 29.2 | 2.1% | 10,047 |
| 2007 | 34.1 | 2.5% | 10,326 |
| 2008 | 33.7 | 2.5% | 9,215 |
| 2009 | 15.6 | 1.1% | 10,283 |
| 2010 | 17.4 | 1.3% | 10,422 |
| 2011 | 27.9 | 2.1% | 10,371 |
| 2012 | 38.2 | 2.8% | 10,045 |
| 2013 | 22.4 | 1.7% | 10,206 |
| 2014 | 48.8 | 3.6% | 8,626 |
| 2015 | 114.4 | 8.3% | 10,045 |
| 2016 | 118.2 | 8.7% | 10,611 |
| 2017 | 81.8 | 5.8% | 10,411 |
| 2018 | 122.6 | 8.7% | 10,273 |
| 2019 | 85.4 | 6.0% | 10,539 |
| 2020 | 82.9 | 5.9% | 10,233 |
| 2021 | 167.8 | 10.5% | 10,457 |
| 2022 | 61.9 | 3.9% | 10,232 |
| 2023 | 46.4 | 2.9% | 5,410 |
| 2024 | 64.6 | 4.1% | 10,223 |
| 2025 | 56.1 | 3.5% | 10,024 |
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 |
|---|---|---|---|---|---|---|---|---|
| GT3 | Natural Gas Fired Combustion Turbine | GT | 168 | 180.7 | Jun 2002 | Operating | — | coming soon |
Owner / operator
Operator: Rockford Generation LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Rockford Generation LLC | 100.0% | 168 MW |
Nearby plants
Within 80 km.
| NRG Rockford I | 316 MW | 0 km |
| Kishwaukee CHP Plant | 3 MW | 1.9 km |
| Lowe's - 1440 - Rockford, IL RDC (POI 2) | — | 2.5 km |
| Lowe's - 1440 - Rockford, IL RDC (POI 1) | — | 2.5 km |
| Slidematic at Rockford | 2 MW | 4.2 km |
| Rockford Solar | 2 MW | 5.2 km |