FIRSTENERGY DAM 4
OperatingHydro power plant
- Capacity
- 2 MW
- Primary fuel
- Hydro
- County
- Jefferson County
- Operator
- ALLEGHENY ENERGY SUPPLY CO LLC
- Status
- Operating
- Commissioned
- 1909
- EIA plant ID
- 6543
- Coordinates
- 39.4931, -77.8269
FIRSTENERGY DAM 4, a 2 MW Hydro power plant in Jefferson County, West Virginia. Operated by ALLEGHENY ENERGY SUPPLY CO LLC, commissioned 1909.
Weather peril exposure
FIRSTENERGY DAM 4 is a 2 MW hydro power plant in Jefferson County, WV, operated by ALLEGHENY ENERGY SUPPLY CO LLC, commissioned in 1909. Jefferson County carries moderate modeled catastrophe exposure in the FEMA National Risk Index, scoring 2.2 of 5 at the 29th national percentile. Lightning is the leading peril, rated Relatively Low by FEMA at the 81st 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.
Jefferson County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Lightning | Relatively Low | 81st | 4.2 of 5 | 37.6 |
| Hurricane | Relatively Low | 64th | 3.5 of 5 | 0.09 |
| Earthquake | Relatively Low | 54th | 3.2 of 5 | <0.01 |
| Riverine flooding | Relatively Low | 45th | 2.8 of 5 | 1.9 |
| Winter weather | Relatively Low | 45th | 2.8 of 5 | 13.1 |
| Hail | Relatively Low | 43rd | 2.7 of 5 | 3.7 |
| Strong wind | Relatively Moderate | 35th | 2.4 of 5 | 7.1 |
| Tornado | Relatively Low | 30th | 2.2 of 5 | 0.13 |
| Heat wave | Relatively Low | 23rd | 1.9 of 5 | 3.7 |
| Wildfire | Very Low | 20th | 1.8 of 5 | <0.01 |
| Ice storm | Very Low | 12th | 1.5 of 5 | 0.66 |
Perils not assessed in Jefferson 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 Jefferson 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.