CALISTOGA POWER PLANT

Operating

Geothermal power plant

Capacity
176 MW
Primary fuel
Geothermal
County
Lake County
Operator
GEYSERS POWER CO LLC
Status
Operating
Commissioned
1984
EIA plant ID
50066
Generators
2
Technology
Geothermal
Net generation (2024)
469 GWh
Capacity factor (2024, EIA nameplate)
30%
Data vintage
EIA-860 2024 final; EIA-923 2022-2024 final
Coordinates
38.7879, -122.7434

See it on the map

CALISTOGA POWER PLANT, a 176 MW Geothermal power plant in Lake County, California. Operated by GEYSERS POWER CO LLC, commissioned 1984.

How CALISTOGA POWER PLANT compares

With 176 MW of capacity, CALISTOGA POWER PLANT ranks 83rd among the 874 operating power plants Bywatts maps in California and 2nd of the 24 operating Geothermal plants in the state. It accounts for about 6.8% of California's operating Geothermal capacity and 0.2% of all operating capacity in the state. Nationally it is the 2nd-largest of the 34 operating Geothermal plants in the database. Commissioned in 1984, it is older than 77% of the 859 operating California plants with a recorded commissioning year. Its operator, GEYSERS POWER CO LLC, runs 4 operating plants in California totaling 1,552 MW. It shares Lake County with 3 other operating plants, including SONOMA CALIFORNIA GEOTHERMAL and BOTTLE ROCK POWER.

EIA-860 lists 2 generators at the site with 176 MW of nameplate capacity, all geothermal technology. Net generation was 469 GWh in 2024 (a 30% capacity factor), down 13% from 2022.

Grid neighborhood

The nearest named substation is CALISTOGA 199 (230 kV), about 0.2 miles away; the closest transmission line found within 10 miles is a 230 kV line owned by PACIFIC GAS & ELECTRIC COMPANY, under 0.1 miles away. Another 11 operating power plants totaling 1,661 MW sit within 25 miles; the largest is GEYSERS UNIT 5-20 (1,273 MW, Geothermal).

Computed by Bywatts from HIFLD power plant, substation and transmission line records and EIA-860/923 survey data; distances are straight-line. Sources and methodology

Weather peril exposure

CALISTOGA POWER PLANT is a 176 MW geothermal power plant in Lake County, CA, operated by GEYSERS POWER CO LLC, commissioned in 1984. Lake County carries moderate modeled catastrophe exposure in the FEMA National Risk Index, scoring 2.4 of 5 at the 35th national percentile. Wildfire is the leading peril, rated Relatively High by FEMA at the 100th 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.

2.4 of 5Modeled catastrophe exposure
ModerateExposure band
WildfireLeading peril
Relatively ModerateFEMA county risk rating

Lake County hazard ratings

PerilFEMA ratingNational percentilePeril scoreEvents per year
WildfireRelatively High100th5.0 of 50.02
Riverine floodingRelatively High99th5.0 of 50.50
EarthquakeRelatively Moderate98th4.9 of 50.09
Heat waveRelatively Low10th1.4 of 56.7
TornadoVery Low8th1.3 of 50.10
LightningVery Low5th1.2 of 55.4
Winter weatherRelatively Low2nd1.1 of 58.8
Strong windVery Low1st1.0 of 5<0.01
HailVery Low0th1.0 of 50.04

Perils not assessed in Lake 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.

PerilWhy it is not scored
HurricaneFEMA rating is "Not Applicable" for this county
Coastal floodingFEMA rating is "Not Applicable" for this county
Ice stormFEMA rating is "Not Applicable" for this county

Model hail, wind and flood exposure for Lake 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.