Magnox is the management and operations contractor responsible for 10 nuclear sites and one hydroelectric plant in the UK.

Under contract to the site owner, the Nuclear Decommissioning Authority, the company is responsible for electricity generation at Wylfa, Oldbury and Maentwrog, defuelling at Chapelcross, Dungeness A and Sizewell A, and the decommissioning of Hunterston A, Berkeley, Hinkley Point A, Bradwell and Trawsfynydd.