Somersworth Lower Great Dam

82 Buffumsville Road, Somersworth, NH 3878

Plant Summary Information

Somersworth Lower Great Dam is ranked #31 out of 32 hydroelectric power plants in New Hampshire in terms of total annual net electricity generation.

Somersworth Lower Great Dam is comprised of 1 generator and generated 189.0 MWh during the 3-month period between September 2025 to December 2025.

Plant NameSomersworth Lower Great Dam
Utility NameGreen Mountain Power Corp
LocationStrafford County, NH
Initial Operation DateJuly 1985
Last Update Dec 2025
Annual Generation 498.0 MWh
Annual Consumption 1.7 k MMBtu
Ranked #12,243 out of 13,081 Power Plants Nationwide
Ranked #1,295 out of 1,311 Water Power Plants Nationwide
Ranked #54 out of 57 New Hampshire Power Plants
Ranked #31 out of 32 New Hampshire Water Power Plants
Fuel Types Water
Previous Operator Somersworth Hydro Company, Inc. (2013 to 2017)
Green Mountain Power Corp (2018 to 2025)

Map of Somersworth Lower Great Dam

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Monthly Net Generation for Somersworth Lower Great Dam

Monthly Plant Fuel Consumption for Somersworth Lower Great Dam

Somersworth Lower Great Dam Details

Summary Information
Plant NameSomersworth Lower Great Dam (50704)
Plant Address82 Buffumsville Road, Somersworth, NH 3878
UtilityGreen Mountain Power Corp (7601)
Latitude, Longitude43.25111, -70.84083
Generation Dates on FileJan 2001 to Dec 2025
Initial Operation DateJuly 1985
Annual Generation 498.0 MWh
Fuel Types Water
 
Federal Energy Regulatory Commission (FERC) Information
FERC Cogeneration StatusNo
FERC Small Power Producer StatusYes
FERC Small Power Producer Docket Number01-21-000
FERC Exempt Wholesale Generator StatusNo
Regulatory Information
Regulatory StatusRegulated
NERC RegionNPCC
Balancing AuthorityISO New England Inc. (ISNE)
NAICS CodeUtilities (22)
Sector Electric Utility (1)
Water SourceSalmon Falls River
Ash Impoundment
Transmission / Distribution OwnerPublic Service Co of NH (15472) NH
Grid Voltage 41.60 kV
Energy StorageNo

Generator GEN1 Details Operating July 1985

TechnologyConventional Hydroelectric
Prime MoverHydroelectric Turbine
OwnershipSingle Owner
Nameplate Capacity1.3 MW
Nameplate Power Factor1
Summer Capacity1.2 MW
Winter Capacity1.2 MW
Minimum Load0.1 MW
Uprate/Derate Completed No
StatusOperating
First Operation DateJuly 1985
Combined Heat & Power No
Sector NameElectric Utility (1)
Energy SourceWater
Solid Fuel Gasification No
Time From Cold Shutdown To Full Load10M

Somersworth Lower Great Dam Plant Owners

Owner NameAddressOwnership
We couldn't locate any owners for this plant

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#1305Rock Creek ITwin Falls, ID86.0 MWh

Nearby Power Plants

Below are closest 20 power plants surrounding Somersworth Lower Great Dam.

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ActonActon, ME4.7 GWh20.5 mi
Berwick Hubbard Solar 1Berwick, ME5.8 GWh6.4 mi
Hampton FacilityHampton, NH28.2 GWh21.6 mi
Lebanon CSG LLCLebanon, ME6.2 GWh10 mi
Lebanon West Lebanon Solar 1Lebanon, ME3.5 GWh10.2 mi
Milton HydroMilton, NH4.6 GWh12.8 mi
NewingtonNewington, NH157.4 GWh10.7 mi
Newington Energy CenterNewington, NH2.1 TWh10.3 mi
QuarryNorth Berwick, ME10.4 GWh8.1 mi
RollinsfordRollinsford, NH3.0 GWh1.6 mi
Salmon FallsSouth Berwick, ME2.1 GWh2.2 mi
Sanford -NYSanford, ME8.1 GWh13.4 mi
Sanford CGASanford, ME7.8 GWh14 mi
Sanford SolarSanford, ME87.3 GWh14.5 mi
SchillerPortsmouth, NH888.0 MWh11 mi
SeabrookSeabrook, NH9.9 TWh24.3 mi
Turnkey Landfill Gas RecoveryRochester, NH38.5 GWh6.4 mi
UNH 7.9 MW PlantDurham, NH53.3 GWh9.2 mi
WaterboroEast Waterboro, ME3.3 GWh24.3 mi
Wells (ME)Wells, ME8.4 GWh11.9 mi