ALSEY
OperatingNatural Gas power plant
- Capacity
- 125 MW
- Primary fuel
- Natural Gas
- County
- Scott County
- Operator
- PRAIRIE POWER, INC
- Status
- Operating
- Commissioned
- 1999
- EIA plant ID
- 7818
- Generators
- 6
- Technology
- Natural Gas Fired Combustion Turbine
- Net generation (2024)
- 38.7 GWh
- Capacity factor (2024, EIA nameplate)
- 2.6%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 39.5700, -90.4360
ALSEY, a 125 MW Natural Gas power plant in Scott County, Illinois. Operated by PRAIRIE POWER, INC, commissioned 1999.
How ALSEY compares
With 125 MW of capacity, ALSEY ranks 56th among the 158 operating power plants Bywatts maps in Illinois and 27th of the 50 operating Natural Gas plants in the state. It accounts for about 0.8% of Illinois's operating Natural Gas capacity and 0.3% of all operating capacity in the state. Nationally it is the 637th-largest of the 1,185 operating Natural Gas plants in the database. Commissioned in 1999, it is newer than 47% of the 150 operating Illinois plants with a recorded commissioning year. Its operator, PRAIRIE POWER, INC, runs 2 operating plants in Illinois totaling 149 MW.
EIA-860 lists 6 generators at the site with 173 MW of nameplate capacity, all natural gas fired combustion turbine technology (this page's HIFLD capacity figure is 125 MW). Net generation was 38.7 GWh in 2024 (a 2.6% capacity factor), down 50% from 2022. Its generators came online between 1999 and 2016.
Grid neighborhood
The closest transmission line found within 10 miles is a 138 kV line, under 0.1 miles away. Another 2 operating power plants totaling 26 MW sit within 25 miles; the largest is PEARL STATION (24 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
ALSEY is a 125 MW natural gas power plant in Scott County, IL, operated by PRAIRIE POWER, INC, commissioned in 1999. Scott County carries high modeled catastrophe exposure in the FEMA National Risk Index, scoring 3.9 of 5 at the 73rd national percentile. Riverine flooding is the leading peril, rated Very Low by FEMA at the 95th 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.
Scott County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Riverine flooding | Very Low | 95th | 4.8 of 5 | 1.3 |
| Strong wind | Relatively Low | 84th | 4.3 of 5 | 5.5 |
| Earthquake | Very Low | 81st | 4.2 of 5 | <0.01 |
| Hail | Very Low | 76th | 4.1 of 5 | 4.3 |
| Tornado | Very Low | 65th | 3.6 of 5 | 0.21 |
| Ice storm | Very Low | 59th | 3.4 of 5 | 1.3 |
| Lightning | Very Low | 53rd | 3.1 of 5 | 47.1 |
| Winter weather | Very Low | 49th | 3.0 of 5 | 8.9 |
| Heat wave | Very Low | 40th | 2.6 of 5 | 8.4 |
| Hurricane | Very Low | 13th | 1.5 of 5 | 0.01 |
| Wildfire | Very Low | 12th | 1.5 of 5 | <0.01 |
Perils not assessed in Scott 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 Scott 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.