STOCKTON BIOMASS
OperatingBiomass power plant
- Capacity
- 54 MW
- Primary fuel
- Biomass
- County
- San Joaquin County
- Operator
- DTE STOCKTON LLC
- Status
- Operating
- Commissioned
- 1987
- EIA plant ID
- 54238
- Generators
- 1
- Technology
- Wood/Wood Waste Biomass
- Net generation (2024)
- 343 GWh
- Capacity factor (2024, EIA nameplate)
- 72%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 37.9436, -121.3304
STOCKTON BIOMASS, a 54 MW Biomass power plant in San Joaquin County, California. Operated by DTE STOCKTON LLC, commissioned 1987.
How STOCKTON BIOMASS compares
With 54 MW of capacity, STOCKTON BIOMASS ranks 238th among the 874 operating power plants Bywatts maps in California and 3rd of the 47 operating Biomass plants in the state. It accounts for about 6.7% of California's operating Biomass capacity and under 0.1% of all operating capacity in the state. Nationally it is the 68th-largest of the 350 operating Biomass plants in the database. Commissioned in 1987, it is older than 69% of the 859 operating California plants with a recorded commissioning year. It shares San Joaquin County with 13 other operating plants, including TRACY COMBINED CYCLE POWER PLANT and RIPON GENERATION STATION.
EIA-860 lists 1 generator at the site with 54 MW of nameplate capacity, all wood/wood waste biomass technology. Net generation was 343 GWh in 2024 (a 72% capacity factor), down 4% from 2022.
Grid neighborhood
The nearest named substation is ROBERTSON, under 0.1 miles away; the closest transmission line found within 10 miles is a 115 kV line owned by PACIFIC GAS & ELECTRIC COMPANY, about 1.6 miles away. Another 26 operating power plants totaling 2,427 MW sit within 25 miles; the largest is MARSH LANDING GENERATING STATION (828 MW, Natural Gas). Within 50 miles are 7 mapped data centers; the nearest is 801 Tenth Street Modesto (Ayera) in Modesto, about 27.8 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
STOCKTON BIOMASS is a 54 MW biomass power plant in San Joaquin County, CA, operated by DTE STOCKTON LLC, commissioned in 1987. San Joaquin County carries low modeled catastrophe exposure in the FEMA National Risk Index, scoring 1.2 of 5 at the 6th national percentile. Earthquake is the leading peril, rated Relatively High by FEMA at the 96th percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a biomass plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
San Joaquin County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Earthquake | Relatively High | 96th | 4.8 of 5 | 0.11 |
| Wildfire | Relatively Moderate | 92nd | 4.7 of 5 | <0.01 |
| Heat wave | Relatively High | 65th | 3.6 of 5 | 7.0 |
| Riverine flooding | Relatively High | 57th | 3.3 of 5 | 1.1 |
| Tornado | Relatively Low | 12th | 1.5 of 5 | 0.18 |
| Hail | Relatively Low | 6th | 1.2 of 5 | 0.07 |
| Lightning | Relatively High | 5th | 1.2 of 5 | 7.7 |
| Strong wind | Relatively Low | 2nd | 1.1 of 5 | 0.05 |
| Winter weather | Relatively Low | 1st | 1.1 of 5 | 0.20 |
Perils not assessed in San Joaquin 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 San Joaquin 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.