ROCKY RIVER
OperatingHydro power plant
- Capacity
- 31 MW
- Primary fuel
- Hydro
- County
- Western Connecticut Planning Region
- Operator
- FIRSTLIGHT POWER RESOURCES SERVICES LLC
- Status
- Operating
- Commissioned
- 1928
- EIA plant ID
- 539
- Coordinates
- 41.5826, -73.4349
ROCKY RIVER, a 31 MW Hydro power plant in Western Connecticut Planning Region, Connecticut. One of 83 power plants tracked in Connecticut on Bywatts.
Weather peril exposure
ROCKY RIVER is a 31 MW hydro power plant in Western Connecticut Planning Region, CT, operated by FIRSTLIGHT POWER RESOURCES SERVICES LLC, commissioned in 1928. Western Connecticut Planning Region carries moderate modeled catastrophe exposure in the FEMA National Risk Index, scoring 2.0 of 5 at the 25th national percentile. Hurricane is the leading peril, rated Relatively High by FEMA at the 85th 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.
Western Connecticut Planning Region hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Hurricane | Relatively High | 85th | 4.4 of 5 | 0.14 |
| Riverine flooding | Relatively High | 77th | 4.1 of 5 | 3.5 |
| Coastal flooding | Relatively High | 73rd | 3.9 of 5 | 6.2 |
| Earthquake | Relatively Moderate | 64th | 3.6 of 5 | <0.01 |
| Ice storm | Relatively High | 58th | 3.3 of 5 | 1.7 |
| Wildfire | Very Low | 31st | 2.2 of 5 | <0.01 |
| Winter weather | Relatively High | 27th | 2.1 of 5 | 13.6 |
| Strong wind | Relatively High | 17th | 1.7 of 5 | 4.5 |
| Tornado | Relatively Moderate | 17th | 1.7 of 5 | 0.20 |
| Hail | Relatively Low | 3rd | 1.1 of 5 | 2.5 |
| Heat wave | Relatively Moderate | 3rd | 1.1 of 5 | 5.5 |
| Lightning | Relatively Moderate | 2nd | 1.1 of 5 | 28.0 |
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.