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
- 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.
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.