TWIN BRANCH
OperatingHydro power plant
- Capacity
- 5 MW
- Primary fuel
- Hydro
- County
- St. Joseph County
- Operator
- INDIANA MICHIGAN POWER CO
- Status
- Operating
- Commissioned
- 1989
- EIA plant ID
- 989
- Coordinates
- 41.6653, -86.1325
TWIN BRANCH, a 5 MW Hydro power plant in St. Joseph County, Indiana. Operated by INDIANA MICHIGAN POWER CO, commissioned 1989.
Weather peril exposure
TWIN BRANCH is a 5 MW hydro power plant in St. Joseph County, IN, operated by INDIANA MICHIGAN POWER CO, commissioned in 1989. St. Joseph County carries elevated modeled catastrophe exposure in the FEMA National Risk Index, scoring 3.2 of 5 at the 54th national percentile. Heat wave is the leading peril, rated Relatively Moderate by FEMA at the 84th 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.
St. Joseph County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Heat wave | Relatively Moderate | 84th | 4.4 of 5 | 4.1 |
| Lightning | Relatively Moderate | 67th | 3.7 of 5 | 40.7 |
| Hail | Relatively High | 65th | 3.6 of 5 | 2.7 |
| Earthquake | Relatively Low | 44th | 2.8 of 5 | <0.01 |
| Tornado | Relatively High | 42nd | 2.7 of 5 | 0.22 |
| Hurricane | Very Low | 17th | 1.7 of 5 | 0.02 |
| Strong wind | Relatively High | 14th | 1.6 of 5 | 4.6 |
| Riverine flooding | Relatively Moderate | 7th | 1.3 of 5 | 0.64 |
| Ice storm | Relatively Moderate | 7th | 1.3 of 5 | 1.3 |
| Wildfire | Very Low | 5th | 1.2 of 5 | <0.01 |
| Winter weather | Relatively Moderate | 2nd | 1.1 of 5 | 18.7 |
Perils not assessed in St. Joseph 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 St. Joseph 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.