RIVERSIDE ENERGY CENTER
OperatingNatural Gas power plant
- Capacity
- 696 MW
- Primary fuel
- Natural Gas
- County
- Rock County
- Operator
- ROCK RIVER ENERGY LLC
- Status
- Operating
- Commissioned
- 2004
- EIA plant ID
- 55641
- Generators
- 3
- Technology
- Natural Gas Fired Combined Cycle
- Net generation (2024)
- 3,386 GWh
- Capacity factor (2024, EIA nameplate)
- 57%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 42.5827, -89.0355
RIVERSIDE ENERGY CENTER, a 696 MW Natural Gas power plant in Rock County, Wisconsin. Operated by ROCK RIVER ENERGY LLC, commissioned 2004.
How RIVERSIDE ENERGY CENTER compares
With 696 MW of capacity, RIVERSIDE ENERGY CENTER ranks 8th among the 141 operating power plants Bywatts maps in Wisconsin and 2nd of the 26 operating Natural Gas plants in the state. It accounts for about 11% of Wisconsin's operating Natural Gas capacity and 4.3% of all operating capacity in the state. Nationally it is the 191st-largest of the 1,185 operating Natural Gas plants in the database. Commissioned in 2004, it is newer than 83% of the 141 operating Wisconsin plants with a recorded commissioning year. It shares Rock County with one other operating plant, AMERESCO JANESVILLE.
EIA-860 lists 3 generators at the site with 675 MW of nameplate capacity, all natural gas fired combined cycle technology. Net generation was 3,386 GWh in 2024 (a 57% capacity factor), up 23% from 2022.
Grid neighborhood
The nearest named substation is NORTHWEST BELOIT (138 kV), about 4.1 miles away; the closest transmission line found within 10 miles is a 138 kV line, under 0.1 miles away. Another 6 operating power plants totaling 776 MW sit within 25 miles; the largest is NRG ROCKFORD I (316 MW, Natural Gas). Within 50 miles are 4 mapped data centers; the nearest is Network 222 in Madison, about 38.3 miles away.
Computed by Bywatts from HIFLD power plant, substation and transmission line records, EIA-860/923 survey data and PeeringDB data center locations; distances are straight-line. Sources and methodology
Weather peril exposure
RIVERSIDE ENERGY CENTER is a 696 MW natural gas power plant in Rock County, WI, operated by ROCK RIVER ENERGY LLC, commissioned in 2004. Rock County carries high modeled catastrophe exposure in the FEMA National Risk Index, scoring 4.1 of 5 at the 77th national percentile. Lightning is the leading peril, rated Relatively High by FEMA at the 97th 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.
Rock County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Lightning | Relatively High | 97th | 4.9 of 5 | 38.5 |
| Hail | Relatively High | 81st | 4.2 of 5 | 4.3 |
| Tornado | Relatively High | 73rd | 3.9 of 5 | 0.58 |
| Riverine flooding | Relatively Moderate | 61st | 3.4 of 5 | 2.1 |
| Heat wave | Relatively Moderate | 56th | 3.3 of 5 | 3.6 |
| Strong wind | Relatively High | 50th | 3.0 of 5 | 5.5 |
| Earthquake | Very Low | 31st | 2.2 of 5 | <0.01 |
| Wildfire | Very Low | 23rd | 1.9 of 5 | <0.01 |
| Ice storm | Relatively Low | 13th | 1.5 of 5 | 0.63 |
| Winter weather | Relatively Moderate | 3rd | 1.1 of 5 | 14.1 |
| Hurricane | Very Low | 1st | 1.1 of 5 | <0.01 |
Perils not assessed in Rock 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 Rock 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.