Office for Nuclear Regulation

Sizewell A


  • Operator/Licensee: Magnox Limited
  • Owner: Nuclear Decommissioning Authority
  • Type of site: Decommissioning
  • Location: Suffolk

Magnox Ltd website

Sizewell A - Copyright Magnox Limited


Sizewell A is located on the Suffolk heritage coast. It ended 40 years of safe, compliant electrical generation on 31 December 2006. The site is currently undergoing decommissioning, with a focus firmly on waste management and hazard reduction. A number of facilities at the site have now been dismantled and cleared.

During the station’s operational lifetime its twin Magnox reactors produced over 110 TWh of electricity. This is enough to continually supply England and Wales for six months. A typical day’s generation saw the station supply more than 10 million kWh of electricity - enough to serve the demand of a third of East Anglia.