GEOTHERMAL 1
OperatingGeothermal power plant
- Capacity
- 110 MW
- Primary fuel
- Geothermal
- County
- Sonoma County
- Operator
- NORTHERN CALIFORNIA POWER AGNY
- Status
- Operating
- Commissioned
- 1983
- EIA plant ID
- 7368
- Coordinates
- 38.7520, -122.7195
GEOTHERMAL 1, a 110 MW Geothermal power plant in Sonoma County, California. Operated by NORTHERN CALIFORNIA POWER AGNY, commissioned 1983.
Weather peril exposure
GEOTHERMAL 1 is a 110 MW geothermal power plant in Sonoma County, CA, operated by NORTHERN CALIFORNIA POWER AGNY, commissioned in 1983. Sonoma County carries low modeled catastrophe exposure in the FEMA National Risk Index, scoring 1.7 of 5 at the 19th national percentile. Earthquake is the leading peril, rated Relatively High by FEMA at the 99th percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a geothermal plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Sonoma County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Earthquake | Relatively High | 99th | 5.0 of 5 | 0.12 |
| Riverine flooding | Relatively High | 97th | 4.9 of 5 | 2.5 |
| Wildfire | Relatively High | 92nd | 4.7 of 5 | <0.01 |
| Coastal flooding | Relatively Moderate | 51st | 3.0 of 5 | 3.4 |
| Heat wave | Relatively Moderate | 11th | 1.4 of 5 | 7.0 |
| Lightning | Relatively Moderate | 10th | 1.4 of 5 | 3.7 |
| Hail | Very Low | 6th | 1.2 of 5 | 0.02 |
| Tornado | Very Low | 4th | 1.1 of 5 | 0.08 |
| Strong wind | Very Low | 2nd | 1.1 of 5 | 0.02 |
| Winter weather | Very Low | 0th | 1.0 of 5 | 0.74 |
Perils not assessed in Sonoma 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 Sonoma 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.