Millstone

314 Rope Ferry Road, Waterford, CT 6385

Plant Summary Information

Millstone is ranked #22 out of 11,623 power plants nationwide in terms of total annual net electricity generation.

Millstone is comprised of 2 generators and generated 4.6 TWh during the 3-month period between December 2024 to March 2025.

Plant Name	Millstone
Utility Name	Dominion Energy Nuclear Conn Inc
Location	Southeastern Connecticut Planning Region, CT
Initial Operation Date	December 1975
Last Update	Mar 2025
Annual Generation	17.1 TWh
Annual Consumption	195.4 M MMBtu
Ranked #22 out of 11,623 Power Plants Nationwide
Ranked #18 out of 54 Nuclear Power Plants Nationwide
Ranked #1 out of 150 Connecticut Power Plants
Ranked #1 out of 1 Connecticut Nuclear Power Plants
Fuel Types	Nuclear
Previous Operator	Dominion Nuclear Conn Inc (2013 to 2016) Dominion Energy Nuclear Conn Inc (2017 to 2023)

Subscribe now to access all power plant data, utility information, FERC EQR data, and more for Millstone.

Summary Information
Plant Name	Millstone (566)
Plant Address	314 Rope Ferry Road, Waterford, CT 6385
Utility	Dominion Energy Nuclear Conn Inc (5221)
Latitude, Longitude	41.3107, -72.1677
Generation Dates on File	Jan 2001 to Mar 2025
Initial Operation Date	December 1975
Annual Generation	17.1 TWh
Fuel Types	Nuclear

Federal Energy Regulatory Commission (FERC) Information
FERC Cogeneration Status	No
FERC Small Power Producer Status	No
FERC Exempt Wholesale Generator Status	No

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	Long Island Sound
Ash Impoundment	No
Transmission / Distribution Owner	NSTAR Electric Company (54913) MA
Grid Voltage	345.00 kV
Energy Storage	No

* Data obtained from the 2023 EIA 860 Report

Technology	Nuclear
Prime Mover	Steam Turbine
Ownership	Single Owner
RTO ISO LMP Node Designation	UN.MILLSTONE2
RTO ISO Location Designation For Reporting Wholesale Sales Data	UN.MILLSTONE2
Nameplate Capacity	909.9 MW
Nameplate Power Factor	0.9
Summer Capacity	857.2 MW
Winter Capacity	869.8 MW
Minimum Load	50 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	December 1975
Combined Heat & Power	No
Sector Name	IPP Non-CHP (2)
Energy Source	Nuclear
Startup Source	Nuclear
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	OVER
Other Planned Modifications	No
Multiple Fuels	No

Technology	Nuclear
Prime Mover	Steam Turbine
Ownership	Jointly Owned
RTO ISO LMP Node Designation	UN.MILLSTONE3
RTO ISO Location Designation For Reporting Wholesale Sales Data	UN.MILLSTONE3
Nameplate Capacity	1350 MW
Nameplate Power Factor	0.9
Summer Capacity	1224 MW
Winter Capacity	1251.3 MW
Minimum Load	65 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	April 1986
Combined Heat & Power	No
Sector Name	IPP Non-CHP (2)
Energy Source	Nuclear
Startup Source	Nuclear
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	OVER
Other Planned Modifications	No
Multiple Fuels	No

Owner Name	Address	Generator	Ownership
Dominion Energy Nuclear Conn Inc	314 Rope Ferry Rd, Waterford, CT 6385	Generator 3	93.47%
Green Mountain Power Corp	163 Acorn Lane, Colchester, VT 5446	Generator 3	1.73%
Massachusetts Mun Wholes Electric Co	P O Box 426 - 327 Moody Street, Ludlow, MA 1056	Generator 3	4.80%

Power plants with a similar annual net generation from Nuclear.

Rank	Plant Name	Plant Location	Annual Generation
#8	Byron Generating Station	Byron, IL	19.8 TWh
#9	Comanche Peak	Glen Rose, TX	19.7 TWh
#10	South Texas Project	Wadsworth, TX	19.7 TWh
#11	LaSalle Generating Station	Marseilles, IL	19.6 TWh
#12	Limerick	Sanatoga, PA	19.5 TWh
#13	Braidwood Generation Station	Braceville, IL	19.5 TWh
#14	Catawba	York, SC	18.8 TWh
#15	PSEG Salem Generating Station	Hancocks Bridge, NJ	18.6 TWh
#16	Diablo Canyon	Avila Beach, CA	18.2 TWh
#17	Donald C Cook	Bridgman, MI	18.1 TWh
#19	Watts Bar Nuclear Plant	Spring City, TN	16.8 TWh
#20	North Anna	Mineral, VA	16.0 TWh
#21	Nine Mile Point Nuclear Station	Lycoming, NY	15.8 TWh
#22	Brunswick Nuclear	Southport, NC	15.5 TWh
#23	St Lucie	Jensen Beach, FL	15.3 TWh
#24	Dresden Generating Station	Morris, IL	15.2 TWh
#25	Quad Cities Generating Station	Cordova, IL	15.2 TWh
#26	Joseph M Farley	Columbia, AL	14.7 TWh
#27	Calvert Cliffs Nuclear Power Plant	Lusby, MD	14.7 TWh
#28	Arkansas Nuclear One	Russellville, AR	14.6 TWh

Below are closest 20 power plants surrounding Millstone.

Plant Name	Plant Location	Annual Generation	Distance
Antares-GRE 314 East Lyme LLC	East Lyme, CT	3.7 GWh	8.1 mi
Bridge Street 1 & 2	Groton, CT	562.0 MWh	5.7 mi
CMEEC - Navy NE Trident	Groton, CT	1.4 GWh	7.4 mi
CMEEC - Polaris Park Solar Hybrid	Gordon, CT	4.9 GWh	6.8 mi
CMEEC - Rogers Rd Solar	Norwich, CT	1.6 GWh	15.9 mi
Connecticut College	New London, CT	8.1 GWh	5.9 mi
Covanta Southeastern Connecticut Company	Preston, CT	112.2 GWh	12.5 mi
Fishers Island 1	Fisher's Island, NY	119.0 MWh	8.7 mi
Fort Hill 1, 2, 3 & 4	Uncasville, CT	519.0 MWh	11.6 mi
Foxwoods CoGen	Mashantucket, CT	10.8 GWh	15.5 mi
Gary Court 1 & 2	Groton, CT	466.0 MWh	7.9 mi
Montville Station	Uncasville, CT	36.2 GWh	8.8 mi
Naval Sub Base New London Fuel Cell	Groton, CT	34.2 GWh	7.5 mi
Norwich WWTP	Norwich, CT	1.0 MWh	15.5 mi
Pfizer Groton Fuel Cell	Groton, CT	42.1 GWh	5.3 mi
Pfizer Groton Plant	Groton, CT	80.2 GWh	4.8 mi
Rand Whitney CHP Plant	Montville, CT	132.5 GWh	10 mi
Subase Microgrid Project	Groton, CT	34.2 GWh	7.5 mi
Water Treatment 1 & 2	Groton, CT	303.0 MWh	7 mi
Yale New Haven - New London	New London, CT	14.6 GWh	3.7 mi