NRG ROCKFORD II ENERGY CENTER
OperatingNatural Gas power plant
- Capacity
- 168 MW
- Primary fuel
- Natural Gas
- County
- Winnebago County
- Operator
- INDECK OPERATIONS INC
- Status
- Operating
- Commissioned
- 2002
- EIA plant ID
- 55936
- Generators
- 1
- Technology
- Natural Gas Fired Combustion Turbine
- Net generation (2024)
- 64.6 GWh
- Capacity factor (2024, EIA nameplate)
- 4.4%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 42.2403, -89.1025
NRG ROCKFORD II ENERGY CENTER, a 168 MW Natural Gas power plant in Winnebago County, Illinois. Operated by INDECK OPERATIONS INC, commissioned 2002.
How NRG ROCKFORD II ENERGY CENTER compares
With 168 MW of capacity, NRG ROCKFORD II ENERGY CENTER ranks 50th among the 158 operating power plants Bywatts maps in Illinois and 25th of the 50 operating Natural Gas plants in the state. It accounts for about 1.1% of Illinois's operating Natural Gas capacity and 0.4% of all operating capacity in the state. Nationally it is the 579th-largest of the 1,185 operating Natural Gas plants in the database. Commissioned in 2002, it is newer than 62% of the 150 operating Illinois plants with a recorded commissioning year. Its operator, INDECK OPERATIONS INC, runs 2 operating plants in Illinois totaling 484 MW. It shares Winnebago County with 4 other operating plants, including NRG ROCKFORD I and MONDELEZ GLOBAL LLC.
EIA-860 lists 1 generator at the site with 168 MW of nameplate capacity, all natural gas fired combustion turbine technology. Net generation was 64.6 GWh in 2024 (a 4.4% capacity factor).
Grid neighborhood
The nearest named substation is CHERRY VALLEY (345 kV), about 6.7 miles away; the closest transmission line found within 10 miles is a 138 kV line owned by COMMONWEALTH EDISON CO, under 0.1 miles away. Another 9 operating power plants totaling 3,498 MW sit within 25 miles; the largest is BYRON GENERATING STATION (2,450 MW, Nuclear).
Computed by Bywatts from HIFLD power plant, substation and transmission line records and EIA-860/923 survey data; distances are straight-line. Sources and methodology
Weather peril exposure
NRG ROCKFORD II ENERGY CENTER is a 168 MW natural gas power plant in Winnebago County, IL, operated by INDECK OPERATIONS INC, commissioned in 2002. Winnebago County carries high modeled catastrophe exposure in the FEMA National Risk Index, scoring 3.7 of 5 at the 68th national percentile. Hail is the leading peril, rated Relatively High by FEMA at the 74th percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a natural gas plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Winnebago County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Hail | Relatively High | 74th | 4.0 of 5 | 4.5 |
| Riverine flooding | Relatively High | 67th | 3.7 of 5 | 2.1 |
| Tornado | Relatively High | 61st | 3.4 of 5 | 0.44 |
| Strong wind | Relatively High | 56th | 3.2 of 5 | 6.1 |
| Lightning | Relatively High | 55th | 3.2 of 5 | 40.0 |
| Heat wave | Relatively Moderate | 51st | 3.0 of 5 | 3.3 |
| Ice storm | Relatively High | 46th | 2.8 of 5 | 0.72 |
| Earthquake | Relatively Low | 39th | 2.6 of 5 | <0.01 |
| Wildfire | Very Low | 21st | 1.8 of 5 | <0.01 |
| Winter weather | Relatively Moderate | 2nd | 1.1 of 5 | 14.7 |
| Hurricane | Very Low | 2nd | 1.1 of 5 | <0.01 |
Perils not assessed in Winnebago County
These perils carry no usable National Risk Index figure for this county, so they are excluded from the scoring rather than scored zero. A zero would claim the peril was assessed and found benign.
| Peril | Why it is not scored |
|---|---|
| Coastal flooding | FEMA rating is "Not Applicable" for this county |
Model hail, wind and flood exposure for Winnebago County in the weather risk calculator
Ratings are the FEMA National Risk Index county hazard ratings; the peril score is a Bywatts transform of the FEMA national percentile. Full data sources and the solar vulnerability methodology are in the weather risk calculator.
Modeled estimate for screening and negotiation. Built from FEMA National Risk Index county hazard data and a solar vulnerability layer documented above. Not a quote, a binder, or actuarial advice, and not a substitute for a carrier's own model. Hazard data: FEMA National Risk Index December 2025, synced 2026-07-24. Resolution is county level, not site level.