COLLIERVILLE POWERHOUSE
OperatingHydro power plant
- Capacity
- 253 MW
- Primary fuel
- Hydro
- County
- Calaveras County
- Operator
- NORTHERN CALIFORNIA POWER AGNY
- Status
- Operating
- Commissioned
- 1989
- EIA plant ID
- 54555
- Generators
- 2
- Technology
- Conventional Hydroelectric
- Net generation (2024)
- 529 GWh
- Capacity factor (2024, EIA nameplate)
- 24%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 38.1446, -120.3805
COLLIERVILLE POWERHOUSE, a 253 MW Hydro power plant in Calaveras County, California. Operated by NORTHERN CALIFORNIA POWER AGNY, commissioned 1989.
How COLLIERVILLE POWERHOUSE compares
With 253 MW of capacity, COLLIERVILLE POWERHOUSE ranks 59th among the 874 operating power plants Bywatts maps in California and 9th of the 195 operating Hydro plants in the state. It accounts for about 1.9% of California's operating Hydro capacity and 0.4% of all operating capacity in the state. Nationally it is the 74th-largest of the 1,243 operating Hydro plants in the database. Commissioned in 1989, it is older than 64% of the 859 operating California plants with a recorded commissioning year. Its operator, NORTHERN CALIFORNIA POWER AGNY, runs 7 operating plants in California totaling 605 MW. It shares Calaveras County with 3 other operating plants, including PARDEE and MURPHYS.
EIA-860 lists 2 generators at the site with 253 MW of nameplate capacity, all conventional hydroelectric technology. Net generation was 529 GWh in 2024 (a 24% capacity factor), about 2 times its 2022 output.
Grid neighborhood
The nearest named substation is COLLIERVILLE (230 kV), under 0.1 miles away; the closest transmission line found within 10 miles is a 230 kV line, under 0.1 miles away. Another 18 operating power plants totaling 926 MW sit within 25 miles; the largest is NEW MELONES (382 MW, Hydro). Within 50 miles is one mapped data center, 801 Tenth Street Modesto (Ayera) in Modesto, about 48.6 miles away.
Computed by Bywatts from HIFLD power plant, substation and transmission line records, EIA-860/923 survey data and PeeringDB data center locations; distances are straight-line. Sources and methodology
Weather peril exposure
COLLIERVILLE POWERHOUSE is a 253 MW hydro power plant in Calaveras County, CA, operated by NORTHERN CALIFORNIA POWER AGNY, commissioned in 1989. Calaveras County carries low modeled catastrophe exposure in the FEMA National Risk Index, scoring 1.6 of 5 at the 16th national percentile. Wildfire 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 hydro plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Calaveras County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Wildfire | Relatively High | 99th | 4.9 of 5 | 0.01 |
| Earthquake | Relatively Low | 74th | 3.9 of 5 | 0.01 |
| Heat wave | Relatively Moderate | 72nd | 3.9 of 5 | 6.1 |
| Riverine flooding | Relatively Moderate | 70th | 3.8 of 5 | 0.71 |
| Winter weather | Relatively High | 38th | 2.5 of 5 | 16.5 |
| Lightning | Relatively Low | 8th | 1.3 of 5 | 14.2 |
| Strong wind | Very Low | 7th | 1.3 of 5 | 0.04 |
| Tornado | Very Low | 5th | 1.2 of 5 | 0.10 |
| Hail | Very Low | 2nd | 1.1 of 5 | 0.11 |
Perils not assessed in Calaveras 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 |
| Ice storm | FEMA rating is "Not Applicable" for this county |
Model hail, wind and flood exposure for Calaveras 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.