GUNTERSVILLE
OperatingHydro power plant
- Capacity
- 115 MW
- Primary fuel
- Hydro
- County
- Marshall County
- Operator
- TENNESSEE VALLEY AUTHORITY
- Status
- Operating
- Commissioned
- 1939
- EIA plant ID
- 48
- Generators
- 4
- Technology
- Conventional Hydroelectric
- Net generation (2024)
- 455 GWh
- Capacity factor (2024, EIA nameplate)
- 45%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 34.4226, -86.3929
GUNTERSVILLE, a 115 MW Hydro power plant in Marshall County, Alabama. Operated by TENNESSEE VALLEY AUTHORITY, commissioned 1939.
How GUNTERSVILLE compares
With 115 MW of capacity, GUNTERSVILLE ranks 32nd among the 64 operating power plants Bywatts maps in Alabama and 11th of the 23 operating Hydro plants in the state. It accounts for about 3.5% of Alabama's operating Hydro capacity and 0.4% of all operating capacity in the state. Nationally it is the 155th-largest of the 1,243 operating Hydro plants in the database. Commissioned in 1939, it is older than 82% of the 64 operating Alabama plants with a recorded commissioning year. Its operator, TENNESSEE VALLEY AUTHORITY, runs 7 operating plants in Alabama totaling 6,524 MW. It shares Marshall County with one other operating plant, ALBERTVILLE.
EIA-860 lists 4 generators at the site with 115 MW of nameplate capacity, all conventional hydroelectric technology. Net generation was 455 GWh in 2024 (a 45% capacity factor), down 19% from 2022. Its generators came online between 1939 and 1952.
Grid neighborhood
The closest transmission line found within 10 miles is a 161 kV line, under 0.1 miles away. One other operating power plant sits within 25 miles: ALBERTVILLE (4 MW, Oil).
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
GUNTERSVILLE is a 115 MW hydro power plant in Marshall County, AL, operated by TENNESSEE VALLEY AUTHORITY, commissioned in 1939. Marshall County carries moderate modeled catastrophe exposure in the FEMA National Risk Index, scoring 2.2 of 5 at the 30th national percentile. Tornado is the leading peril, rated Relatively High by FEMA at the 99th 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.
Marshall County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Tornado | Relatively High | 99th | 5.0 of 5 | 0.66 |
| Earthquake | Relatively Low | 81st | 4.2 of 5 | <0.01 |
| Lightning | Relatively High | 68th | 3.7 of 5 | 60.9 |
| Riverine flooding | Relatively Moderate | 64th | 3.6 of 5 | 1.8 |
| Hurricane | Relatively Low | 54th | 3.2 of 5 | 0.03 |
| Ice storm | Relatively Moderate | 54th | 3.1 of 5 | 0.77 |
| Wildfire | Very Low | 47th | 2.9 of 5 | <0.01 |
| Strong wind | Relatively High | 40th | 2.6 of 5 | 5.2 |
| Heat wave | Relatively Moderate | 32nd | 2.3 of 5 | 5.3 |
| Hail | Relatively Low | 30th | 2.2 of 5 | 4.8 |
| Winter weather | Relatively Moderate | 11th | 1.4 of 5 | 4.6 |
Perils not assessed in Marshall 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 Marshall 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.