Shepaug
2225 River Road, Southbury, CT 6488Plant Summary Information
Shepaug is ranked #22 out of 168 power plants in Connecticut in terms of total annual net electricity generation.
Shepaug is comprised of 1 generator and generated 15.3 GWh during the 3-month period between September 2025 to December 2025.
| Plant Name | Shepaug |
|---|---|
| Utility Name | FirstLight Power Resources Services LLC |
| Location | Naugatuck Valley Planning Region, CT |
| Initial Operation Date | January 1955 |
| Last Update | Dec 2025 |
| Annual Generation | 93.3 GWh |
| Annual Consumption | 345.4 k MMBtu |
| Ranked #3,577 out of 13,081 Power Plants Nationwide | |
| Ranked #340 out of 1,311 Water Power Plants Nationwide | |
| Ranked #22 out of 168 Connecticut Power Plants | |
| Ranked #1 out of 12 Connecticut Water Power Plants | |
| Fuel Types | Water |
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Monthly Net Generation for Shepaug
Monthly Plant Fuel Consumption for Shepaug
Shepaug Details
| Summary Information | |
|---|---|
| Plant Name | Shepaug (552) |
| Plant Address | 2225 River Road, Southbury, CT 6488 |
| Utility | FirstLight Power Resources Services LLC (54895) |
| Latitude, Longitude | 41.44842, -73.29532 |
| Generation Dates on File | Jan 2001 to Dec 2025 |
| Initial Operation Date | January 1955 |
| Annual Generation | 93.3 GWh |
| Fuel Types | Water |
| Federal Energy Regulatory Commission (FERC) Information | |
| FERC Cogeneration Status | No |
| FERC Small Power Producer Status | No |
| FERC Exempt Wholesale Generator Status | Yes |
| FERC Exempt Wholesale Generator Docket Number | 00-94-000 |
| Regulatory Information | |
|---|---|
| Regulatory Status | Non-Regulated |
| NERC Region | NPCC |
| Balancing Authority | ISO New England Inc. (ISNE) |
| NAICS Code | Utilities (22) |
| Sector | IPP Non-CHP (2) |
| Water Source | Housatonic River |
| Ash Impoundment | No |
| Transmission / Distribution Owner | Connecticut Light & Power Co (4176) CT |
| Grid Voltage | 69.00 kV |
| Energy Storage | No |
Generator 1 Details Operating January 1955
| Technology | Conventional Hydroelectric |
|---|---|
| Prime Mover | Hydroelectric Turbine |
| Ownership | Wholly Owned by Other Entity |
| Nameplate Capacity | 37.2 MW |
| Nameplate Power Factor | 0.85 |
| Summer Capacity | 41.5 MW |
| Winter Capacity | 42.6 MW |
| Minimum Load | 35 MW |
| Uprate/Derate Completed | No |
| Status | Operating |
| First Operation Date | January 1955 |
| Combined Heat & Power | No |
|---|---|
| Sector Name | IPP Non-CHP (2) |
| Energy Source | Water |
| Solid Fuel Gasification | No |
| Carbon Capture Technology | No |
| Time From Cold Shutdown To Full Load | 10M |
| Planned Net Summer Capacity Uprate | 7.5 MW |
| Planned Net Winter Capacity Uprate | 7.5 MW |
| Planned Uprate | December 2026 |
| Multiple Fuels | No |
Shepaug Plant Owners
| Owner Name | Address | Ownership |
|---|---|---|
| FirstLight Hydro Generating Company | 143 West Street Ext. Suite E, New Milford, CT 6776 | 100.00% |
| FirstLight Hydro Generating Company | 143 West Street Ext. Suite E, New Milford, CT 6776 | 100.00% |
Power Plants with Similar Net Generation
Power plants with a similar annual net generation from Water.
| Rank | Plant Name | Plant Location | Annual Generation |
|---|---|---|---|
| #330 | Petenwell | Necedah, WI | 97.2 GWh |
| #331 | Twin Cities Hydro LLC | St. Paul, MN | 97.1 GWh |
| #332 | North Highlands | Columbus, GA | 96.9 GWh |
| #333 | Tuckertown Hydro | New London, NC | 95.7 GWh |
| #334 | York Haven | York Haven, PA | 95.7 GWh |
| #335 | Fort Patrick Henry | Kingsport, TN | 94.8 GWh |
| #336 | Beaver Dam (AR) | Eureka Springs, AR | 94.6 GWh |
| #337 | Tugalo | Tallulah Falls, GA | 93.9 GWh |
| #338 | Lake Lynn Hydro Station | Lake Lynn, PA | 93.9 GWh |
| #339 | Falls Hydro | Badin, NC | 93.6 GWh |
| #341 | Winfield | Winfield, WV | 93.0 GWh |
| #342 | Horse Mesa | Apache Junction, AZ | 92.6 GWh |
| #343 | Upper Salmon A | Hagerman, ID | 92.6 GWh |
| #344 | Shoshone (CO) | Glenwood Springs, CO | 91.8 GWh |
| #345 | Saluda Lexington | Columbia, SC | 91.5 GWh |
| #346 | Bennetts Bridge | Altmar, NY | 90.4 GWh |
| #347 | Stewarts Bridge | Corinth, NY | 90.4 GWh |
| #348 | Mountain Island | Mount Holly, NC | 90.0 GWh |
| #349 | Muck Valley Hydroelectric | NA, CA | 89.8 GWh |
| #350 | Union Valley | Fresh Pond, CA | 89.1 GWh |
Nearby Power Plants
Below are closest 20 power plants surrounding Shepaug.
| Plant Name | Plant Location | Annual Generation | Distance |
|---|---|---|---|
| Benz Solar 1 | Ansonia, CT | 1.3 GWh | 14.2 mi |
| Benz Solar 2 | Ansonia, CT | 1.3 GWh | 14.2 mi |
| Bridgeport Fuel Cell, LLC | Bridgeport, CT | 90.4 GWh | 19.9 mi |
| Bridgeport Station | Bridgeport, CT | 3.2 TWh | 20 mi |
| Bulls Bridge | New Milford, CT | 26.9 GWh | 17.8 mi |
| CPV Towantic Energy Center | Oxford, CT | 5.5 TWh | 9.2 mi |
| Danbury Hospital Cogen Plant | Danbury, CT | 21.6 GWh | 8.4 mi |
| Derby Fuel Cell | Derby, CT | 110.3 GWh | 13.3 mi |
| Derby Hydro | Shelton, CT | 22.7 GWh | 13.2 mi |
| Emerald Gardens PKI, LLC | Shelton, CT | 2.0 GWh | 15.1 mi |
| GenConn Devon LLC | Milford, CT | 15.1 GWh | 19.1 mi |
| Kimberly Clark-Unit 1,2,3 | New Milford, CT | 233.3 GWh | 9.8 mi |
| Milford Power Project | Milford, CT | 3.2 TWh | 18.5 mi |
| New Milford Gas Recovery | New Milford, CT | 4.0 GWh | 9.6 mi |
| Park Solar | Woodbridge, CT | 1.5 GWh | 17.8 mi |
| Sikorsky Aircraft CHP | Stratford, CT | 65.3 GWh | 17.1 mi |
| Stevenson | Monroe, CT | 70.8 GWh | 7.8 mi |
| UI RCP Woodbridge FC | Woodbridge, CT | 16.7 GWh | 16.2 mi |
| Waterbury Generation | Waterbury, CT | 55.0 GWh | 14.7 mi |
| Watertown Solar One, LLC | Watertown, CT | 2.9 GWh | 14.1 mi |