Wylfa
Anglesey, Anglesey
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.
2 units: 2 permanent shutdown.
| Unit | Type | Model | Net MWe | Construction | Grid | Commercial Op | Shutdown | Status |
|---|---|---|---|---|---|---|---|---|
| Wylfa 1 | GCR | MAGNOX | 490 | 1963-09-01 | 1971-01-24 | 1971-11-01 | 2015-12-30 | Permanent Shutdown |
| Wylfa 2 | GCR | MAGNOX | 490 | 1963-09-01 | 1971-07-21 | 1972-01-03 | 2012-04-25 | Permanent Shutdown |
Capacity, milestones and suppliers
| Unit | Design MWe | Gross MWe | Thermal MWt | First Criticality | Reactor Supplier | Turbine Supplier | Notes |
|---|---|---|---|---|---|---|---|
| Wylfa 1 | 550 | 530 | 1,650 | 1969-11-01 | THE ENGLISH ELECTRIC CO., LTD / BABCOCK & WILCOX CO. / TAYLOR WOODROW CONSTRUCTION, LTD. | THE ENGLISH ELECTRIC CO., LTD. | |
| Wylfa 2 | 550 | 540 | 1,920 | 1970-09-01 | THE ENGLISH ELECTRIC CO., LTD / BABCOCK & WILCOX CO. / TAYLOR WOODROW CONSTRUCTION, LTD. | THE ENGLISH ELECTRIC CO., LTD. |
Lifetime performance, through 2025
| Unit | Electricity Supplied | Load Factor | Energy Availability | Operating Factor |
|---|---|---|---|---|
| Wylfa 1 | 126.5 TWh | 70.3% | 70.0% | 82.3% |
| Wylfa 2 | 109.3 TWh | 69.8% | 69.5% | 82.7% |
Operator: MAGNOX, LTD
Owner: Nuclear Decommissioning Authority
Source: IAEA Power Reactor Information System (PRIS), as of 2026-11-02.
Fuel Cycle Facilities
Fuel cycle plants at this site, as listed in the IAEA Nuclear Fuel Cycle Facilities Database: what each plant does, its scale and design capacity, the years it operated, its current status and who operates it.
1 facility: 1 in operation.
| Facility | Type | Scale | Design Capacity | Operated | Status | Operator |
|---|---|---|---|---|---|---|
| NDA Wylfa NPP Site | AFR Dry Spent Fuel Storage | Commercial | 700 t HM | 1979–2015 | In Operation | Magnox North Limited |
Source: IAEA Nuclear Fuel Cycle Facilities Database (NFCFDB), as of 2026-10-13.
Working Here
Per Diem Rates FY 2026
Per diem covers lodging and meals & incidental expenses (M&IE) for government and contractor travel near this facility. Rates are from the U.S. State Department foreign per diem tables for FY 2026.
$252
Lodging/Night
$108
M&IE/Day
$360
Total/Day
United Kingdom: rate for locations the State Department does not list separately
U.S. Department of State foreign per diem, for U.S. government and contractor travel.
Photos
Photos of this facility from the NukeWorker photo gallery. Click the header or any photo to browse the full album.
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.
53.4167, -4.48223
Location & Contact
Physical address, phone number, and website for this facility. Use the directions link to get driving directions via Google Maps.
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: Wylfa Nuclear Power Station.
Wylfa is a nuclear power station site on the island of Anglesey in northwest Wales, west of Cemaes Bay, built on the coast to use seawater for cooling. It had two Magnox reactors, built by British Nuclear Design and Construction, a consortium of English Electric, Babcock & Wilcox and Taylor Woodrow, with reactors supplied by The Nuclear Power Group.
Read more
Construction began in 1963, and the reactors were first connected to the grid in January and July 1971. Reactor 2 stopped generating on 25 April 2012, and reactor 1 was shut down on 30 December 2015. Defuelling took place between 2016 and 2019.