69.7 MW Conventional Hydroelectric (7 MW) + Wood/Wood Waste Biomass (63 MW) operating in Cumberland, ME — ISO New England Inc.
69.7 MW
Nameplate Capacity
16
Generators
units
Hybrid (2)
Technology
Conventional Hydroelectric + Wood/Wood Waste Biomass
1903
Operating Since
Coordinates
43.6849, -70.3531
County
Cumberland, ME
Nearby Plants
Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Relevate Power Management LLC | Sappi North America Westbrook Mill | — |
| Owner(s) | Relevate Power Management LLC | Sappi | — |
| Status | Operating | retired | — |
The S D Warren Westbrook plant, located in Cumberland County, Maine, is a hybrid power facility with a total capacity of 69.7 MW. Commissioned in 1903, the plant is owned by Sappi, a company based in South Africa, and operated by Relevate Power Management LLC. It utilizes both conventional hydroelectric and wood/wood waste biomass technologies, with a total of 16 generators on site. The plant's primary fuel source is water.
In the most recent year of reported data, S D Warren Westbrook generated 32,731 MWh, operating at a capacity factor of 5.4%. The plant is connected to the ISO New England Inc. balancing authority and is within the NPCC NERC region. It ranks as the 4th largest power plant in Maine out of 51 facilities, and nationally it ranks 256 out of 1464 plants.
Generated from EIA, GEM, and public data sources
NERC Region
NPCC
Balancing Authority
ISO New England Inc.
Grid Voltage
34.5 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP CHP
1.9K MWh
Latest Month
32.7K MWh
Annual Generation
5.4%
Capacity Factor
No financial data available for this plant.
Market Position
ISO/RTO Market
ISO-NE
LMP Node
591_:_UN_PRID_CRN115_SWBK
Pricing Hub
.Z.MAINE
Node Source
EIA-860 direct report
Frank Wescott Obituary (1942 - 2015) - Windham, ME - Portland Press Herald/Maine Sunday Telegram
Frank H. Wescott, 72WINDHAM - Frank H. Wescott, 72, died on Feb. 19, 2015, at the Cedars Nursing Home in Portland. He was born in Westbrook on April 7,...
Sappi North America formally dropping the S.D. Warren Co. name
The change will affect the Westbrook paper mill and other sites acquired in 1994.
John Bradford Obituary (2006) - Boston, MA - Boston Globe
83 years of age of Gail Street in Yarmouth died at his home on Sunday, Oct. 1, 2006. He was born in Winthrop, MA on Nov.
Last updated 2026-03-14
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