GROSS HYDRO PLANT
OperatingHydro power plant
- Capacity
- 8 MW
- Primary fuel
- Hydro
- County
- Jefferson County
- Operator
- DENVER CITY & COUNTY OF
- Status
- Operating
- Commissioned
- 2007
- EIA plant ID
- 10424
- Coordinates
- 39.9457, -105.3565
GROSS HYDRO PLANT, an 8 MW Hydro power plant in Jefferson County, Colorado. Operated by DENVER CITY & COUNTY OF, commissioned 2007.
Weather peril exposure
GROSS HYDRO PLANT is an 8 MW hydro power plant in Jefferson County, CO, operated by DENVER CITY & COUNTY OF, commissioned in 2007. Jefferson County carries critical modeled catastrophe exposure in the FEMA National Risk Index, scoring 5.0 of 5 at the 99th national percentile. Hail is the leading peril, rated Very 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.
Jefferson County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Hail | Very High | 99th | 5.0 of 5 | 6.9 |
| Wildfire | Relatively High | 97th | 4.9 of 5 | <0.01 |
| Winter weather | Very High | 67th | 3.7 of 5 | 18.9 |
| Tornado | Relatively High | 66th | 3.7 of 5 | 0.56 |
| Earthquake | Relatively Low | 47th | 2.9 of 5 | <0.01 |
| Riverine flooding | Relatively High | 27th | 2.1 of 5 | 1.3 |
| Lightning | Very High | 26th | 2.0 of 5 | 57.7 |
| Heat wave | Relatively Low | 26th | 2.0 of 5 | 0.18 |
| Strong wind | Relatively High | 26th | 2.0 of 5 | 0.95 |
| Ice storm | Relatively Moderate | 2nd | 1.1 of 5 | 0.01 |
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 |
|---|---|
| Hurricane | FEMA rating is "Not Applicable" for this county |
| 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.