INTERSTATE
OperatingNatural Gas power plant
- Capacity
- 139 MW
- Primary fuel
- Natural Gas
- County
- Sangamon County
- Operator
- CITY OF SPRINGFIELD - (IL)
- Status
- Operating
- Commissioned
- 1997
- EIA plant ID
- 7425
- Generators
- 1
- Technology
- Natural Gas Fired Combustion Turbine
- Net generation (2024)
- 50.8 GWh
- Capacity factor (2024, EIA nameplate)
- 4.2%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 39.8233, -89.5891
INTERSTATE, a 139 MW Natural Gas power plant in Sangamon County, Illinois. Operated by CITY OF SPRINGFIELD - (IL), commissioned 1997.
How INTERSTATE compares
With 139 MW of capacity, INTERSTATE ranks 55th among the 158 operating power plants Bywatts maps in Illinois and 26th of the 50 operating Natural Gas plants in the state. It accounts for about 0.9% of Illinois's operating Natural Gas capacity and 0.3% of all operating capacity in the state. Nationally it is the 619th-largest of the 1,185 operating Natural Gas plants in the database. Commissioned in 1997, it is older than 54% of the 150 operating Illinois plants with a recorded commissioning year. Its operator, CITY OF SPRINGFIELD - (IL), runs 5 operating plants in Illinois totaling 418 MW. It shares Sangamon County with 4 other operating plants, including DALLMAN and FACTORY.
EIA-860 lists 1 generator at the site with 139 MW of nameplate capacity, all natural gas fired combustion turbine technology. Net generation was 50.8 GWh in 2024 (a 4.2% capacity factor).
Grid neighborhood
The closest transmission line found within 10 miles is a 138 kV line, under 0.1 miles away. Another 6 operating power plants totaling 1,602 MW sit within 25 miles; the largest is KINCAID GENERATION LLC (1,319 MW, Coal).
Computed by Bywatts from HIFLD power plant and transmission line records and EIA-860/923 survey data; distances are straight-line. Sources and methodology
Weather peril exposure
INTERSTATE is a 139 MW natural gas power plant in Sangamon County, IL, operated by CITY OF SPRINGFIELD - (IL), commissioned in 1997. Sangamon County carries high modeled catastrophe exposure in the FEMA National Risk Index, scoring 3.5 of 5 at the 63rd national percentile. Earthquake is the leading peril, rated Relatively Moderate by FEMA at the 85th 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.
Sangamon County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Earthquake | Relatively Moderate | 85th | 4.4 of 5 | <0.01 |
| Tornado | Relatively High | 82nd | 4.3 of 5 | 0.93 |
| Hail | Relatively High | 69th | 3.8 of 5 | 3.7 |
| Winter weather | Relatively High | 50th | 3.0 of 5 | 8.9 |
| Lightning | Relatively High | 50th | 3.0 of 5 | 47.7 |
| Ice storm | Relatively Moderate | 45th | 2.8 of 5 | 1.5 |
| Strong wind | Relatively High | 37th | 2.5 of 5 | 5.3 |
| Heat wave | Relatively Moderate | 37th | 2.5 of 5 | 8.3 |
| Riverine flooding | Relatively Moderate | 35th | 2.4 of 5 | 2.2 |
| Hurricane | Very Low | 13th | 1.5 of 5 | <0.01 |
| Wildfire | Very Low | 13th | 1.5 of 5 | <0.01 |
Perils not assessed in Sangamon 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 Sangamon 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.