FOUR MILE HYDROPOWER PROJECT
OperatingHydro power plant
- Capacity
- 2 MW
- Primary fuel
- Hydro
- County
- Alpena County
- Operator
- THUNDER BAY POWER CO LLC
- Status
- Operating
- Commissioned
- 1990
- EIA plant ID
- 54341
- Coordinates
- 45.0934, -83.5023
FOUR MILE HYDROPOWER PROJECT, a 2 MW Hydro power plant in Alpena County, Michigan. Operated by THUNDER BAY POWER CO LLC, commissioned 1990.
Weather peril exposure
FOUR MILE HYDROPOWER PROJECT is a 2 MW hydro power plant in Alpena County, MI, operated by THUNDER BAY POWER CO LLC, commissioned in 1990. Alpena County carries low modeled catastrophe exposure in the FEMA National Risk Index, scoring 1.5 of 5 at the 12th national percentile. Heat wave is the leading peril, rated Very Low by FEMA at the 74th 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.
Alpena County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Heat wave | Very Low | 74th | 4.0 of 5 | 0.84 |
| Hail | Very Low | 31st | 2.3 of 5 | 0.72 |
| Riverine flooding | Relatively Low | 30th | 2.2 of 5 | 0.07 |
| Wildfire | Very Low | 23rd | 1.9 of 5 | <0.01 |
| Hurricane | Very Low | 21st | 1.8 of 5 | 0.01 |
| Tornado | Very Low | 18th | 1.7 of 5 | 0.12 |
| Ice storm | Very Low | 15th | 1.6 of 5 | 0.07 |
| Coastal flooding | Very Low | 14th | 1.6 of 5 | 0.01 |
| Lightning | Relatively Low | 9th | 1.4 of 5 | 23.9 |
| Strong wind | Very Low | 7th | 1.3 of 5 | 0.59 |
| Earthquake | Very Low | 7th | 1.3 of 5 | <0.01 |
| Winter weather | Very Low | 5th | 1.2 of 5 | 17.2 |
Model hail, wind and flood exposure for Alpena 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.