JOHNSONBURG MILL
OperatingBiomass power plant
- Capacity
- 54 MW
- Primary fuel
- Biomass
- County
- Elk County
- Operator
- DOMTAR LLC
- Status
- Operating
- Commissioned
- 1993
- EIA plant ID
- 54638
- Generators
- 1
- Technology
- Wood/Wood Waste Biomass
- Net generation (2024)
- 40.6 GWh
- Capacity factor (2024, EIA nameplate)
- 8.6%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 41.4918, -78.6757
JOHNSONBURG MILL, a 54 MW Biomass power plant in Elk County, Pennsylvania. Operated by DOMTAR LLC, commissioned 1993.
How JOHNSONBURG MILL compares
With 54 MW of capacity, JOHNSONBURG MILL ranks 70th among the 170 operating power plants Bywatts maps in Pennsylvania and 3rd of the 21 operating Biomass plants in the state. It accounts for about 11% of Pennsylvania's operating Biomass capacity and 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 1993, it is older than 55% of the 168 operating Pennsylvania plants with a recorded commissioning year.
EIA-860 lists 1 generator at the site with 54 MW of nameplate capacity, all wood/wood waste biomass technology. Net generation was 40.6 GWh in 2024 (an 8.6% capacity factor), down 73% from 2022.
Grid neighborhood
The closest transmission line found within 10 miles is a 138 kV line owned by WEST PENN POWER CO, about 0.2 miles away.
Computed by Bywatts from HIFLD power plant and transmission line records and EIA-860/923 survey data; distances are straight-line. Sources and methodology
Weather peril exposure
JOHNSONBURG MILL is a 54 MW biomass power plant in Elk County, PA, operated by DOMTAR LLC, commissioned in 1993. Elk County carries low modeled catastrophe exposure in the FEMA National Risk Index, scoring 1.2 of 5 at the 5th national percentile. Riverine flooding is the leading peril, rated Relatively Low by FEMA at the 88th 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.
Elk County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Riverine flooding | Relatively Low | 88th | 4.5 of 5 | 0.43 |
| Hurricane | Relatively Low | 64th | 3.6 of 5 | 0.05 |
| Strong wind | Relatively Low | 49th | 3.0 of 5 | 2.0 |
| Winter weather | Relatively Moderate | 46th | 2.9 of 5 | 18.8 |
| Lightning | Relatively Moderate | 42nd | 2.7 of 5 | 35.5 |
| Earthquake | Very Low | 20th | 1.8 of 5 | <0.01 |
| Tornado | Very Low | 18th | 1.7 of 5 | 0.20 |
| Wildfire | Very Low | 16th | 1.6 of 5 | <0.01 |
| Ice storm | Very Low | 16th | 1.6 of 5 | 0.29 |
| Hail | Very Low | 9th | 1.4 of 5 | 1.2 |
| Heat wave | Very Low | 2nd | 1.1 of 5 | 0.42 |
Perils not assessed in Elk 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 |
|---|---|
| Coastal flooding | FEMA rating is "Not Applicable" for this county |
Model hail, wind and flood exposure for Elk 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.