Magnox Ltd, the management and operations contractor, are responsible for the safe and secure clean-up of 12 nuclear sites and operation of one hydro-electric plant. The company is responsible for electricity generation at Maentwrog, defuelling at Wylfa and the decommissioning of Berkeley, Bradwell, Chapelcross, Dungeness A, Harwell, Hinkley Point A, Hunterston A, Oldbury, Sizewell A, Trawsfynydd and Winfrith, in the United Kingdom.