NORRIS DAM
OperatingHydro power plant
- Capacity
- 131 MW
- Primary fuel
- Hydro
- County
- Anderson County
- Operator
- TENNESSEE VALLEY AUTHORITY
- Status
- Operating
- Commissioned
- 1936
- EIA plant ID
- 3411
- Coordinates
- 36.2240, -84.0915
NORRIS DAM, a 131 MW Hydro power plant in Anderson County, Tennessee. Operated by TENNESSEE VALLEY AUTHORITY, commissioned 1936.
Weather peril exposure
NORRIS DAM is a 131 MW hydro power plant in Anderson County, TN, operated by TENNESSEE VALLEY AUTHORITY, commissioned in 1936. Anderson County carries moderate modeled catastrophe exposure in the FEMA National Risk Index, scoring 2.6 of 5 at the 40th national percentile. Lightning is the leading peril, rated Relatively Moderate by FEMA at the 90th percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a hydro plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Anderson County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Lightning | Relatively Moderate | 90th | 4.6 of 5 | 57.0 |
| Earthquake | Relatively Low | 86th | 4.5 of 5 | <0.01 |
| Riverine flooding | Relatively Moderate | 74th | 4.0 of 5 | 1.1 |
| Winter weather | Relatively Moderate | 72nd | 3.9 of 5 | 5.1 |
| Ice storm | Relatively Moderate | 62nd | 3.5 of 5 | 0.47 |
| Wildfire | Very Low | 60th | 3.4 of 5 | <0.01 |
| Tornado | Relatively Moderate | 55th | 3.2 of 5 | 0.12 |
| Hail | Relatively Low | 51st | 3.0 of 5 | 3.0 |
| Hurricane | Very Low | 40th | 2.6 of 5 | 0.02 |
| Strong wind | Relatively Moderate | 24th | 2.0 of 5 | 5.2 |
| Heat wave | Very Low | 12th | 1.5 of 5 | 0.84 |
Perils not assessed in Anderson 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 Anderson 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.