CORALVILLE GT
OperatingNatural Gas power plant
- Capacity
- 72 MW
- Primary fuel
- Natural Gas
- County
- Johnson County
- Operator
- MIDAMERICAN ENERGY CO
- Status
- Operating
- Commissioned
- 1970
- EIA plant ID
- 1079
- Generators
- 4
- Technology
- Natural Gas Fired Combustion Turbine
- Net generation (2024)
- 0.8 GWh
- Capacity factor (2024, EIA nameplate)
- 0.1%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 41.6719, -91.5640
CORALVILLE GT, a 72 MW Natural Gas power plant in Johnson County, Iowa. Operated by MIDAMERICAN ENERGY CO, commissioned 1970.
How CORALVILLE GT compares
With 72 MW of capacity, CORALVILLE GT ranks 57th among the 198 operating power plants Bywatts maps in Iowa and 9th of the 22 operating Natural Gas plants in the state. It accounts for about 2.9% of Iowa's operating Natural Gas capacity and 0.5% of all operating capacity in the state. Nationally it is the 745th-largest of the 1,185 operating Natural Gas plants in the database. Commissioned in 1970, it is older than 76% of the 198 operating Iowa plants with a recorded commissioning year. Its operator, MIDAMERICAN ENERGY CO, runs 28 operating plants in Iowa totaling 8,028 MW. It shares Johnson County with 2 other operating plants, UNIVERSITY OF IOWA MAIN POWER PLANT and OAKDALE RENEWABLE ENERGY PLANT.
EIA-860 lists 4 generators at the site with 72 MW of nameplate capacity, all natural gas fired combustion turbine technology. Net generation was 0.8 GWh in 2024 (a 0.1% capacity factor).
Grid neighborhood
The closest transmission line found within 10 miles is a 161 kV line owned by MIDAMERICAN ENERGY CO, under 0.1 miles away. Another 11 operating power plants totaling 548 MW sit within 25 miles; the largest is ARCHER DANIELS MIDLAND CEDAR RAPIDS (256 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
CORALVILLE GT is a 72 MW natural gas power plant in Johnson County, IA, operated by MIDAMERICAN ENERGY CO, commissioned in 1970. Johnson County carries critical modeled catastrophe exposure in the FEMA National Risk Index, scoring 4.5 of 5 at the 87th national percentile. Tornado is the leading peril, rated Relatively High by FEMA at the 100th 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.
Johnson County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Tornado | Relatively High | 100th | 5.0 of 5 | 0.59 |
| Strong wind | Very High | 97th | 4.9 of 5 | 6.4 |
| Heat wave | Relatively Moderate | 90th | 4.6 of 5 | 7.0 |
| Hail | Relatively High | 87th | 4.5 of 5 | 4.4 |
| Lightning | Relatively Moderate | 55th | 3.2 of 5 | 44.3 |
| Winter weather | Relatively High | 51st | 3.1 of 5 | 15.5 |
| Ice storm | Relatively Moderate | 50th | 3.0 of 5 | 0.46 |
| Wildfire | Relatively Low | 50th | 3.0 of 5 | <0.01 |
| Riverine flooding | Relatively Moderate | 43rd | 2.7 of 5 | 2.0 |
| Earthquake | Very Low | 22nd | 1.9 of 5 | <0.01 |
| Hurricane | Very Low | 3rd | 1.1 of 5 | <0.01 |
Perils not assessed in Johnson 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 Johnson 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.