Office for Nuclear Regulation



  • Operator/Licensee: Magnox Limited
  • Owner: Nuclear Decommissioning Authority
  • Type of site: Decommissioning
  • Location: Anglesey, North Wales

Magnox website

Wylfa - Copyright Magnox Limited


Wylfa is a twin reactor decommissioning power station located on the north coast of the Isle of Anglesey between Amlwch and Holyhead in the northwest of Wales. The site is 20.8 hectares surrounded by grazing agricultural land and a Site of Special Scientific Interest (Tre‘r Gof SSSI). 

Construction work at Wylfa began in 1963, with commencement of operations in 1971. Generation ceased on 30 December 2015 and marked the conclusion of Magnox reactor generation in the UK. Defueling was completed in September 2019, with 87,890 fuel elements removed from the site and transported to Sellafield for reprocessing.

In 2020, the Nuclear Decommissioning Authority announced plans to develop a continuous reactor decommissioning strategy which is intended to bring forward the date when Wylfa achieves final site clearance and is in discussion with HM Government to pursue this.