PATTERSON PASS
OperatingWind power plant
- Capacity
- 22 MW
- Primary fuel
- Wind
- County
- Alameda County
- Operator
- EDF RENEWABLE SERVICES INC
- Status
- Operating
- EIA plant ID
- 56213
- Coordinates
- 37.7020, -121.6137
PATTERSON PASS, a 22 MW Wind power plant in Alameda County, California. Operated by EDF RENEWABLE SERVICES INC.
Weather peril exposure
PATTERSON PASS is a 22 MW wind power plant in Alameda County, CA, operated by EDF RENEWABLE SERVICES INC. Alameda County carries low modeled catastrophe exposure in the FEMA National Risk Index, scoring 1.6 of 5 at the 16th national percentile. Earthquake is the leading peril, rated Very High by FEMA at the 100th percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a wind plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Alameda County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Earthquake | Very High | 100th | 5.0 of 5 | 0.14 |
| Wildfire | Relatively High | 91st | 4.6 of 5 | <0.01 |
| Riverine flooding | Very High | 85th | 4.4 of 5 | 2.3 |
| Coastal flooding | Relatively High | 47th | 2.9 of 5 | 0.98 |
| Heat wave | Relatively High | 43rd | 2.7 of 5 | 7.1 |
| Tornado | Relatively Moderate | 11th | 1.4 of 5 | 0.09 |
| Hail | Relatively Low | 7th | 1.3 of 5 | 0.04 |
| Winter weather | Very Low | 4th | 1.2 of 5 | 0.69 |
| Strong wind | Very Low | 1st | 1.0 of 5 | 0.04 |
| Lightning | Relatively Low | 1st | 1.0 of 5 | 4.5 |
Perils not assessed in Alameda 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 |
| Ice storm | FEMA rating is "Not Applicable" for this county |
Model hail, wind and flood exposure for Alameda 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.