PORT WENTWORTH MILL
OperatingBiomass power plant
- Capacity
- 72 MW
- Primary fuel
- Biomass
- County
- Chatham County
- Operator
- WEYERHAEUSER NR PORT WENTWORTH
- Status
- Operating
- Commissioned
- 1991
- EIA plant ID
- 50804
- Generators
- 2
- Technology
- Wood/Wood Waste Biomass
- Net generation (2024)
- 421 GWh
- Capacity factor (2024, EIA nameplate)
- 66%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 32.1558, -81.1583
PORT WENTWORTH MILL, a 72 MW Biomass power plant in Chatham County, Georgia. Operated by WEYERHAEUSER NR PORT WENTWORTH, commissioned 1991.
How PORT WENTWORTH MILL compares
With 72 MW of capacity, PORT WENTWORTH MILL ranks 48th among the 104 operating power plants Bywatts maps in Georgia and 5th of the 11 operating Biomass plants in the state. It accounts for about 10% of Georgia's operating Biomass capacity and 0.2% of all operating capacity in the state. Nationally it is the 40th-largest of the 350 operating Biomass plants in the database. Commissioned in 1991, it is newer than 54% of the 101 operating Georgia plants with a recorded commissioning year. It shares Chatham County with 4 other operating plants, including INTERNATIONAL PAPER SAVANNA MILL and IMPERIAL SAVANNAH LP.
EIA-860 lists 2 generators at the site with 72 MW of nameplate capacity, all wood/wood waste biomass technology. Net generation was 421 GWh in 2024 (a 66% capacity factor), down 11% from 2022. Its generators came online between 1991 and 2004.
Grid neighborhood
The closest transmission line found within 10 miles is a 115 kV line owned by GEORGIA POWER CO, about 0.1 miles away. Another 9 operating power plants totaling 3,888 MW sit within 25 miles; the largest is JASPER (1,002 MW, Natural Gas).
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
PORT WENTWORTH MILL is a 72 MW biomass power plant in Chatham County, GA, operated by WEYERHAEUSER NR PORT WENTWORTH, commissioned in 1991. Chatham County carries critical modeled catastrophe exposure in the FEMA National Risk Index, scoring 4.5 of 5 at the 87th national percentile. Hurricane is the leading peril, rated Very High by FEMA at the 98th 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.
Chatham County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Hurricane | Very High | 98th | 4.9 of 5 | 0.35 |
| Lightning | Relatively High | 88th | 4.5 of 5 | 64.9 |
| Earthquake | Relatively Moderate | 84th | 4.3 of 5 | <0.01 |
| Coastal flooding | Very High | 76th | 4.1 of 5 | 3.7 |
| Wildfire | Relatively Moderate | 70th | 3.8 of 5 | <0.01 |
| Ice storm | Relatively High | 65th | 3.6 of 5 | 0.48 |
| Heat wave | Relatively Moderate | 43rd | 2.7 of 5 | 9.5 |
| Winter weather | Relatively Moderate | 33rd | 2.3 of 5 | 0.61 |
| Riverine flooding | Relatively Moderate | 28th | 2.1 of 5 | 1.3 |
| Tornado | Relatively Moderate | 24th | 2.0 of 5 | 0.19 |
| Hail | Relatively Low | 19th | 1.7 of 5 | 1.7 |
| Strong wind | Relatively Moderate | 5th | 1.2 of 5 | 1.1 |
Model hail, wind and flood exposure for Chatham 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.