FOLSOM
OperatingHydro power plant
- Capacity
- 215 MW
- Primary fuel
- Hydro
- County
- Sacramento County
- Operator
- U S BUREAU OF RECLAMATION
- Status
- Operating
- Commissioned
- 1955
- EIA plant ID
- 441
- Generators
- 3
- Technology
- Conventional Hydroelectric
- Net generation (2024)
- 604 GWh
- Capacity factor (2024, EIA nameplate)
- 35%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 38.7067, -121.1584
FOLSOM, a 215 MW Hydro power plant in Sacramento County, California. Operated by U S BUREAU OF RECLAMATION, commissioned 1955.
How FOLSOM compares
With 215 MW of capacity, FOLSOM ranks 69th among the 874 operating power plants Bywatts maps in California and 10th of the 195 operating Hydro plants in the state. It accounts for about 1.6% of California's operating Hydro capacity and 0.3% of all operating capacity in the state. Nationally it is the 82nd-largest of the 1,243 operating Hydro plants in the database. Commissioned in 1955, it is older than 92% of the 859 operating California plants with a recorded commissioning year. Its operator, U S BUREAU OF RECLAMATION, runs 10 operating plants in California totaling 2,087 MW. It shares Sacramento County with 38 other operating plants, including COSUMNES and SCA COGEN 2.
EIA-860 lists 3 generators at the site with 199 MW of nameplate capacity, all conventional hydroelectric technology. Net generation was 604 GWh in 2024 (a 35% capacity factor), up 45% from 2022.
Grid neighborhood
The nearest named substation is FOLSOM (230 kV), about 0.2 miles away; the closest transmission line found within 10 miles is a 230 kV line owned by SACRAMENTO MUNICIPAL UTILITY DISTRICT, about 0.1 miles away. Another 27 operating power plants totaling 1,195 MW sit within 25 miles; the largest is WHITE ROCK/SLAB CREEK (266 MW, Hydro). Within 50 miles are 2 mapped data centers; the nearest is RagingWire CA1 - NTT in Sacramento, about 18.3 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
FOLSOM is a 215 MW hydro power plant in Sacramento County, CA, operated by U S BUREAU OF RECLAMATION, commissioned in 1955. Sacramento County carries low modeled catastrophe exposure in the FEMA National Risk Index, scoring 1.1 of 5 at the 3rd national percentile. Earthquake is the leading peril, rated Relatively High by FEMA at the 90th 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.
Sacramento County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Earthquake | Relatively High | 90th | 4.6 of 5 | 0.12 |
| Wildfire | Relatively Moderate | 89th | 4.6 of 5 | <0.01 |
| Heat wave | Relatively Moderate | 43rd | 2.7 of 5 | 7.0 |
| Riverine flooding | Relatively High | 36th | 2.5 of 5 | 1.9 |
| Hail | Relatively Low | 11th | 1.5 of 5 | 0.07 |
| Tornado | Relatively Moderate | 11th | 1.4 of 5 | 0.12 |
| Lightning | Relatively Moderate | 1st | 1.0 of 5 | 8.1 |
| Winter weather | Very Low | 1st | 1.0 of 5 | 0.06 |
| Strong wind | Very Low | 0th | 1.0 of 5 | 0.03 |
Perils not assessed in Sacramento 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 "No Rating" for this county |
| Ice storm | FEMA rating is "Not Applicable" for this county |
Model hail, wind and flood exposure for Sacramento 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.