JOHNSONVILLE
OperatingCoal power plant
- Capacity
- 2,911 MW
- Primary fuel
- Coal
- County
- Humphreys County
- Operator
- TENNESSEE VALLEY AUTHORITY
- Status
- Operating
- Commissioned
- 1975
- EIA plant ID
- 3406
- Coordinates
- 36.0279, -87.9863
JOHNSONVILLE, a 2,911 MW Coal power plant in Humphreys County, Tennessee. Operated by TENNESSEE VALLEY AUTHORITY, commissioned 1975.
Weather peril exposure
JOHNSONVILLE is a 2,911 MW coal power plant in Humphreys County, TN, operated by TENNESSEE VALLEY AUTHORITY, commissioned in 1975. Humphreys County carries elevated modeled catastrophe exposure in the FEMA National Risk Index, scoring 2.9 of 5 at the 48th national percentile. Earthquake is the leading peril, rated Relatively Low by FEMA at the 92nd percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a coal plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Humphreys County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Earthquake | Relatively Low | 92nd | 4.7 of 5 | <0.01 |
| Tornado | Relatively Moderate | 87th | 4.5 of 5 | 0.44 |
| Strong wind | Relatively Moderate | 82nd | 4.3 of 5 | 4.3 |
| Riverine flooding | Relatively Low | 81st | 4.3 of 5 | 0.68 |
| Ice storm | Relatively Moderate | 79th | 4.2 of 5 | 0.71 |
| Hail | Very Low | 52nd | 3.1 of 5 | 3.2 |
| Heat wave | Relatively Low | 49th | 3.0 of 5 | 5.8 |
| Hurricane | Very Low | 48th | 2.9 of 5 | 0.02 |
| Lightning | Relatively Low | 45th | 2.8 of 5 | 58.0 |
| Winter weather | Very Low | 37th | 2.5 of 5 | 5.5 |
| Wildfire | Very Low | 18th | 1.7 of 5 | <0.01 |
Perils not assessed in Humphreys 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 Humphreys 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.