Somersworth Lower Great Dam
82 Buffumsville Road, Somersworth, NH 3878Plant 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 Name | Somersworth Lower Great Dam |
|---|---|
| Utility Name | Green Mountain Power Corp |
| Location | Strafford County, NH |
| Initial Operation Date | July 1985 |
| Last Update | Dec 2025 |
| Annual Generation | 498.0 MWh |
| Annual Consumption | 1.7 k MMBtu |
| Ranked #12,256 out of 13,094 Power Plants Nationwide | |
| Ranked #1,292 out of 1,309 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) |
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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 Name | Somersworth Lower Great Dam (50704) |
| Plant Address | 82 Buffumsville Road, Somersworth, NH 3878 |
| Utility | Green Mountain Power Corp (7601) |
| Latitude, Longitude | 43.25111, -70.84083 |
| Generation Dates on File | Jan 2001 to Dec 2025 |
| Initial Operation Date | July 1985 |
| Annual Generation | 498.0 MWh |
| Fuel Types | Water |
| Federal Energy Regulatory Commission (FERC) Information | |
| FERC Cogeneration Status | No |
| FERC Small Power Producer Status | Yes |
| FERC Small Power Producer Docket Number | 01-21-000 |
| FERC Exempt Wholesale Generator Status | No |
| Regulatory Information | |
|---|---|
| Regulatory Status | Regulated |
| NERC Region | NPCC |
| Balancing Authority | ISO New England Inc. (ISNE) |
| NAICS Code | Utilities (22) |
| Sector | Electric Utility (1) |
| Water Source | Salmon Falls River |
| Ash Impoundment | |
| Transmission / Distribution Owner | Public Service Co of NH (15472) NH |
| Grid Voltage | 41.60 kV |
| Energy Storage | No |
Generator GEN1 Details Operating July 1985
| Technology | Conventional Hydroelectric |
|---|---|
| Prime Mover | Hydroelectric Turbine |
| Ownership | Single Owner |
| Nameplate Capacity | 1.3 MW |
| Nameplate Power Factor | 1 |
| Summer Capacity | 1.2 MW |
| Winter Capacity | 1.2 MW |
| Minimum Load | 0.1 MW |
| Uprate/Derate Completed | No |
|---|---|
| Status | Operating |
| First Operation Date | July 1985 |
| Combined Heat & Power | No |
| Sector Name | Electric Utility (1) |
| Energy Source | Water |
| Solid Fuel Gasification | No |
| Time From Cold Shutdown To Full Load | 10M |
Somersworth Lower Great Dam Plant Owners
| Owner Name | Address | Ownership | We couldn't locate any owners for this plant |
|---|
Power Plants with Similar Net Generation
Power plants with a similar annual net generation from Water.
| Rank | Plant Name | Plant Location | Annual Generation |
|---|---|---|---|
| #1282 | Mill Creek 3 | Mill Creek, CA | 771.0 MWh |
| #1283 | W K Sanders | Hyde Park, VT | 716.0 MWh |
| #1284 | South Dry Creek Hydro | Red Lodge, MT | 696.0 MWh |
| #1285 | Springville Hydroelectric | Camarillo, CA | 659.0 MWh |
| #1286 | Cosgrove Intake and Power Station | Clinton, MA | 646.0 MWh |
| #1287 | Talcville | Edwards, NY | 616.0 MWh |
| #1288 | Lateral 10 Ventures | Buhl, ID | 565.0 MWh |
| #1289 | Squa Pan Hydro Station | Masardis, ME | 564.0 MWh |
| #1290 | Niangua | Camdenton, MO | 536.0 MWh |
| #1291 | Domtar Paper Company Rothschild | Rothschild, WI | 524.0 MWh |
| #1293 | Rocky Brook Hydroelectric | Brinnon, WA | 464.0 MWh |
| #1294 | Kalaheo Hydro | Kalaheo, HI | 461.0 MWh |
| #1295 | Spartanburg Water System | Chesnee, SC | 530.0 MWh |
| #1296 | Barron | Barron, WI | 382.0 MWh |
| #1297 | Kearney | Kearney, NE | 375.0 MWh |
| #1298 | Wrightsville Hydro Plant | Montpelier, VT | 374.0 MWh |
| #1299 | Georgia-Pacific Big Island | Big Island, VA | 38.9 GWh |
| #1300 | Mascoma Hydro | W. Lebanon, NH | 202.0 MWh |
| #1301 | Argyle | Argyle, WI | 193.0 MWh |
| #1302 | Lanesboro | Lanesboro, MN | 140.0 MWh |
Nearby Power Plants
Below are closest 20 power plants surrounding Somersworth Lower Great Dam.
| Plant Name | Plant Location | Annual Generation | Distance |
|---|---|---|---|
| Acton | Acton, ME | 4.7 GWh | 20.5 mi |
| Berwick Hubbard Solar 1 | Berwick, ME | 5.8 GWh | 6.4 mi |
| Hampton Facility | Hampton, NH | 28.1 GWh | 21.6 mi |
| Lebanon CSG LLC | Lebanon, ME | 6.2 GWh | 10 mi |
| Lebanon West Lebanon Solar 1 | Lebanon, ME | 3.5 GWh | 10.2 mi |
| Milton Hydro | Milton, NH | 4.6 GWh | 12.8 mi |
| Newington | Newington, NH | 146.6 GWh | 10.7 mi |
| Newington Energy Center | Newington, NH | 2.1 TWh | 10.3 mi |
| Quarry | North Berwick, ME | 10.4 GWh | 8.1 mi |
| Rollinsford | Rollinsford, NH | 3.0 GWh | 1.6 mi |
| Salmon Falls | South Berwick, ME | 2.1 GWh | 2.2 mi |
| Sanford -NY | Sanford, ME | 8.1 GWh | 13.4 mi |
| Sanford CGA | Sanford, ME | 7.8 GWh | 14 mi |
| Sanford Solar | Sanford, ME | 88.7 GWh | 14.5 mi |
| Schiller | Portsmouth, NH | 888.0 MWh | 11 mi |
| Seabrook | Seabrook, NH | 9.9 TWh | 24.3 mi |
| Turnkey Landfill Gas Recovery | Rochester, NH | 38.5 GWh | 6.4 mi |
| UNH 7.9 MW Plant | Durham, NH | 51.4 GWh | 9.2 mi |
| Waterboro | East Waterboro, ME | 3.3 GWh | 24.3 mi |
| Wells (ME) | Wells, ME | 8.4 GWh | 11.9 mi |