S D WARREN WESTBROOK

Operating

Biomass 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

See it on the map

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.

3.1 of 5Modeled catastrophe exposure
ElevatedExposure band
Coastal floodingLeading peril
Relatively LowFEMA county risk rating

Cumberland County hazard ratings

PerilFEMA ratingNational percentilePeril scoreEvents per year
Coastal floodingRelatively Moderate93rd4.7 of 58.2
Ice stormVery High91st4.7 of 51.8
HurricaneRelatively Moderate84th4.4 of 50.12
Winter weatherVery High76th4.0 of 526.5
EarthquakeRelatively Low63rd3.5 of 5<0.01
LightningRelatively High53rd3.1 of 518.1
HailRelatively Moderate45th2.8 of 51.4
WildfireVery Low8th1.3 of 5<0.01
Strong windRelatively Moderate7th1.3 of 50.39
Heat waveRelatively Low6th1.2 of 53.3
Riverine floodingRelatively Low4th1.2 of 52.0
TornadoVery Low2nd1.1 of 50.10

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.