S D WARREN WESTBROOK
OperatingBiomass power plant
- Capacity
- 71 MW
- Primary fuel
- Biomass
- County
- Cumberland County
- Operator
- S D WARREN CO.- WESTBROOK
- Status
- Operating
- Commissioned
- 1903
- EIA plant ID
- 50447
- Generators
- 16
- Technology
- Wood/Wood Waste Biomass
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 43.6849, -70.3531
S D WARREN WESTBROOK, a 71 MW Biomass power plant in Cumberland County, Maine. Operated by S D WARREN CO.- WESTBROOK, commissioned 1903.
How S D WARREN WESTBROOK compares
With 71 MW of capacity, S D WARREN WESTBROOK ranks 12th among the 83 operating power plants Bywatts maps in Maine and 2nd of the 15 operating Biomass plants in the state. It accounts for about 15% of Maine's operating Biomass capacity and 1.6% of all operating capacity in the state. Nationally it is the 42nd-largest of the 350 operating Biomass plants in the database. Commissioned in 1903, it is older than 97% of the 81 operating Maine plants with a recorded commissioning year. It shares Cumberland County with 7 other operating plants, including WILLIAM F WYMAN and WESTBROOK ENERGY CENTER POWER PLANT.
EIA-860 lists 16 generators at the site with 70 MW of nameplate capacity, mainly wood/wood waste biomass technology. Its generators came online between 1903 and 1985.
Grid neighborhood
The nearest named substation is SOUTH GORHAM (345 kV), about 4.9 miles away; the closest transmission line found within 10 miles is a 115 kV line owned by CENTRAL MAINE POWER CO, about 1.8 miles away. Another 11 operating power plants totaling 1,523 MW sit within 25 miles; the largest is WILLIAM F WYMAN (846 MW, Oil).
Computed by Bywatts from HIFLD power plant, substation and transmission line records and EIA-860/923 survey data; distances are straight-line. Sources and methodology
Weather peril exposure
S D WARREN WESTBROOK is a 71 MW biomass power plant in Cumberland County, ME, operated by S D WARREN CO.- WESTBROOK, commissioned in 1903. Cumberland County carries elevated modeled catastrophe exposure in the FEMA National Risk Index, scoring 3.1 of 5 at the 53rd national percentile. Coastal flooding is the leading peril, rated Relatively Moderate by FEMA at the 93rd 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.
Cumberland County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Coastal flooding | Relatively Moderate | 93rd | 4.7 of 5 | 8.2 |
| Ice storm | Very High | 91st | 4.7 of 5 | 1.8 |
| Hurricane | Relatively Moderate | 84th | 4.4 of 5 | 0.12 |
| Winter weather | Very High | 76th | 4.0 of 5 | 26.5 |
| Earthquake | Relatively Low | 63rd | 3.5 of 5 | <0.01 |
| Lightning | Relatively High | 53rd | 3.1 of 5 | 18.1 |
| Hail | Relatively Moderate | 45th | 2.8 of 5 | 1.4 |
| Wildfire | Very Low | 8th | 1.3 of 5 | <0.01 |
| Strong wind | Relatively Moderate | 7th | 1.3 of 5 | 0.39 |
| Heat wave | Relatively Low | 6th | 1.2 of 5 | 3.3 |
| Riverine flooding | Relatively Low | 4th | 1.2 of 5 | 2.0 |
| Tornado | Very Low | 2nd | 1.1 of 5 | 0.10 |
Model hail, wind and flood exposure for Cumberland 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.