Millstone 1
DECONDominion Energy·Waterford, CT·BWR·641 MWe
Reactor Data
Reactor Units
Every power reactor at this site as listed in the IAEA Power Reactor Information System (PRIS): reactor type and model, net electrical capacity, grid connection and commercial operation dates, and current status.
1 unit: 1 permanent shutdown.
| Unit | Type | Model | Net MWe | Construction | Grid | Commercial Op | Shutdown | Status |
|---|---|---|---|---|---|---|---|---|
| Millstone 1 | BWR | 641 | 1966-05-01 | 1970-11-29 | 1971-03-01 | 1998-07-01 | Permanent Shutdown |
Capacity, milestones and suppliers
| Unit | Design MWe | Gross MWe | Thermal MWt | First Criticality | Reactor Supplier | Turbine Supplier | Notes |
|---|---|---|---|---|---|---|---|
| Millstone 1 | 660 | 684 | 2,011 | 1970-10-26 | GENERAL ELECTRIC CO. |
Lifetime performance, through 2025
| Unit | Electricity Supplied | Load Factor | Energy Availability | Operating Factor |
|---|---|---|---|---|
| Millstone 1 | 101.4 TWh | 65.0% | 70.5% | 69.0% |
Operator: Dominion Energy
Source: IAEA Power Reactor Information System (PRIS), as of 2026-10-19.
Working Here
Jobs at Millstone 12 active
Active job listings posted for this specific facility on the NukeWorker job board. Click a job title for details, or the header to see them all.
Per Diem Rates FY 2027
Per diem covers lodging and meals & incidental expenses (M&IE) for government and contractor travel near this facility. Rates are from GSA for FY 2027.
$149
Lodging/Night
$86
M&IE/Day
$235
Total/Day
New London / Groton, New London County, CT
Unemployment Benefits CT
Maximum state unemployment insurance benefits for CT. Actual benefits depend on your earnings history and may be lower than the maximum. Data as of Jan 2026.
$826
Max Weekly
26
Max Weeks
$21,476
Max Total
Photos
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Facility Map
Interactive satellite map showing the facility's geographic location. Marker color indicates current status: green for online, red for offline, orange for reduced power. Click the header to open in Google Maps satellite view.
41.311, -72.1668
Location & Contact
Physical address, phone number, and website for this facility. Use the directions link to get driving directions via Google Maps.
Phone:
(860) 444-5797
Website:
http://www.dom.com
Plant Facts
About This Site
Written by NukeWorker from public records: facts that do not change. Operator, status and capacity come from the live data elsewhere on this page. Sources: Wikipedia: Millstone Nuclear Power Station.
Millstone Nuclear Power Station is at Waterford, in New London County, Connecticut, on Long Island Sound, on the site of a former quarry. It was built with three units.
Read more
Construction began on Unit 1 (General Electric boiling water reactor) in May 1966, Unit 2 (Combustion Engineering pressurized water reactor) in November 1969, and Unit 3 (Westinghouse pressurized water reactor) in August 1974. They connected to the grid in 1970, 1975 and 1986. A leaking valve in February 1996 led to the shutdown of all the reactors for repairs. Unit 3 restarted in July 1998 and Unit 2 in May 1999. Unit 1 was permanently shut down in July 1998, because the cost of fixing its safety issues was too high.
Ownership & Construction
The utility or company that owns and operates the facility, the architect-engineer responsible for plant design, and the primary construction contractor. Click names to view all facilities by that entity on the map.
D
Dominion Energy, Inc.
NYSE
$65.32
▲ +2.99 (+4.79%)
Previous Close
62.33
Day's Range
62.73 – 65.43
52-Week Range
55.85 – 72.99
Volume
3,822,492
Delayed quote as of Oct 22, 2026 3:38 PM ET.
Source: Yahoo Finance.
Full quote on Yahoo Finance
Dominion Energy and NextEra Energy (NEE) announced a merger on 2026-05-18. It is still subject to regulatory and shareholder approval, so Dominion remains the owner of record here until the deal closes.
Technical Specs
Reactor design specifications including type (PWR/BWR), containment design, nuclear steam supply system manufacturer, thermal and electrical power ratings, and current operational status.
Licensing
NRC licensing history including docket number, license type and number, construction permit date, operating license issuance, commercial operation date, license renewal, and expiration date.
Docket #:
05000245
License #:
DPR-21
License Type:
OL-FP
Const. Permit:
1966-05-19
Operating Lic:
1986-10-31
Commercial Op:
1971-03-01
License Exp:
2010-10-06