Tunnel

72 Roosevelt Drive, Preston, CT 6365

Plant Summary Information

Tunnel is ranked #8 out of 12 hydroelectric power plants in Connecticut in terms of total annual net electricity generation.

Tunnel is comprised of 3 generators and generated 1.3 GWh during the 3-month period between September 2025 to December 2025.

Plant Name	Tunnel
Utility Name	FirstLight Power Resources Services LLC
Location	Southeastern Connecticut Planning Region, CT
Initial Operation Date	January 1919
Last Update	Dec 2025
Annual Generation	5.9 GWh
Annual Consumption	21.4 k MMBtu
Ranked #7,860 out of 13,081 Power Plants Nationwide
Ranked #1,043 out of 1,311 Water Power Plants Nationwide
Ranked #78 out of 168 Connecticut Power Plants
Ranked #8 out of 12 Connecticut Water Power Plants
Fuel Types	Water

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Summary Information
Plant Name	Tunnel (557)
Plant Address	72 Roosevelt Drive, Preston, CT 6365
Utility	FirstLight Power Resources Services LLC (54895)
Latitude, Longitude	41.55543, -72.04183
Generation Dates on File	Jan 2001 to Dec 2025
Initial Operation Date	January 1919
Annual Generation	5.9 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	Quinebaug River
Ash Impoundment	No
Transmission / Distribution Owner	Connecticut Light & Power Co (4176) CT
Grid Voltage	23.00 kV
Energy Storage	No

* Data obtained from the 2025 EIA 860 Report

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Wholly Owned by Other Entity
Nameplate Capacity	1 MW
Nameplate Power Factor	0.85
Summer Capacity	0.8 MW
Winter Capacity	1.1 MW
Minimum Load	0.3 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	January 1919
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	1H
Multiple Fuels	No

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Wholly Owned by Other Entity
Nameplate Capacity	1 MW
Nameplate Power Factor	0.85
Summer Capacity	0.8 MW
Winter Capacity	1.1 MW
Minimum Load	0.3 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	January 1949
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	1H
Multiple Fuels	No

Technology	Petroleum Liquids
Prime Mover	Combustion Turbine
Ownership	Wholly Owned by Other Entity
Nameplate Capacity	18.5 MW
Nameplate Power Factor	0.85
Summer Capacity	16.5 MW
Winter Capacity	21.8 MW
Minimum Load	5 MW
Uprate/Derate Completed	No
Status	Standby
Synchronized To Transmission Grid	Yes

First Operation Date	January 1969
Combined Heat & Power	No
Sector Name	IPP Non-CHP (2)
Energy Source	Jet Fuel
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	1H
Multiple Fuels	No
Cofire Fuels	No
Switch Between Oil And Natural Gas	No

Owner Name	Address	Generator	Ownership
FirstLight Hydro Generating Company	143 West Street Ext. Suite E, New Milford, CT 6776	Generator 1	100.00%
FirstLight Hydro Generating Company	143 West Street Ext. Suite E, New Milford, CT 6776	Generator 10	100.00%
FirstLight Hydro Generating Company	143 West Street Ext. Suite E, New Milford, CT 6776	Generator 2	100.00%

Power plants with a similar annual net generation from Water.

Rank	Plant Name	Plant Location	Annual Generation
#1033	Bolton Falls	Duxbury, VT	6.1 GWh
#1034	Brasfield	Petersburg, VA	6.1 GWh
#1035	Notre Dame Hydro	South Bend, IN	6.0 GWh
#1036	Newcastle	Auburn, CA	6.0 GWh
#1037	Oconto Falls Lower	Oconto Falls, WI	6.0 GWh
#1038	Roaring Creek Water Power	Montgomery Creek, CA	6.0 GWh
#1039	Beldens	New Haven, VT	6.0 GWh
#1040	Way Dam	Crystal Falls, MI	6.0 GWh
#1041	Parker	Snelling, CA	6.0 GWh
#1042	Prickett	Pelkie, MI	5.9 GWh
#1044	Ninth Street Hydropower Project	Alpena, MI	5.9 GWh
#1045	Stillwater Hydro Station	Stillwater, ME	5.9 GWh
#1046	Fall Creek	Hornbrook, CA	5.9 GWh
#1047	Lost Creek I	Burney, CA	5.9 GWh
#1048	Angels	Angels Camp, CA	5.9 GWh
#1049	Middlesex 2	Moretown, VT	5.9 GWh
#1050	Lake Mathews	Riverside, CA	5.8 GWh
#1051	West Charleston	West Charleston, VT	5.8 GWh
#1052	Upper Newton Falls	Newton Falls, NY	5.8 GWh
#1053	New Hogan Power Plant	Valley Springs, CA	5.7 GWh

Below are closest 20 power plants surrounding Tunnel.

Plant Name	Plant Location	Annual Generation	Distance
Backus Microgrid Project	Norwich, CT	843.0 MWh	2.8 mi
Clinton Solar	Griswold, CT	1.7 GWh	7.5 mi
CMEEC - Bozrah	Bozrah, CT	3.1 GWh	6.1 mi
CMEEC - Norwich Stott St Solar Hybrid	Norwich, CT	3.6 GWh	3.6 mi
CMEEC - Rogers Rd Solar	Norwich, CT	1.5 GWh	4.3 mi
Conn Mun Electric Energy Coop	Norwich, CT	1.2 GWh	4.3 mi
Covanta Southeastern Connecticut Company	Preston, CT	108.5 GWh	5.7 mi
Fort Hill 1, 2, 3 & 4	Uncasville, CT	734.0 MWh	6.6 mi
Foxwoods CoGen	Mashantucket, CT	10.8 GWh	7.1 mi
Franklin Solar (CT)	Lebanon, CT	1.6 GWh	9.2 mi
Fusion Solar Center LLC	Baltic, CT	37.8 GWh	4.7 mi
Jackson Solar (CT)	Griswold, CT	1.6 GWh	7.4 mi
Jewett City 1	Jewett City, CT	139.0 MWh	4.6 mi
LNG 1 & 2	Norwich, CT	382.0 MWh	4 mi
Rand Whitney CHP Plant	Montville, CT	131.8 GWh	8.6 mi
Scotland Dam	Windham, CT	3.8 GWh	8.6 mi
Sherman Solar	Griswold, CT	1.6 GWh	7.5 mi
Taftville	Taftville, CT	2.2 GWh	1.2 mi
Tenth Street	Norwich, CT	1.9 GWh	1.2 mi
Wheelabrator Lisbon	Lisbon, CT	100.8 GWh	2 mi