Sellafield annual costs of operating Sellafield increased from £900 million to about £1.6 billion. The estimated lifetime undiscounted cost of dealing with the Sellafield site increased to £67.5 billion. Bosses were forced to apologise after projected clean-up costs passed the £70 billion mark in late 2013. In 2014, the undiscounted decommissioning cost estimate for Sellafield was increased to £79.1 billion, and by 2015 to £117.4 billion. The annual operating cost will be £2 billion in 2016. Following the decision taken by the British government in January 1947 to develop nuclear weapons, Sellafield was chosen as the location of the plutonium production
Wylfa Nuclear Power Station nuclear station on a site adjacent to the old plant. An application to build two advanced boiling water reactors was submitted by Horizon Nuclear Power to the Office of Nuclear Regulation on 4 April 2017. Wylfa was the second nuclear power station to be built in Wales after Trawsfynydd in 1959. Following the closure of Trawsfynydd in 1991, Wylfa became Wales' only nuclear power station. Construction of Wylfa, which was undertaken by British Nuclear Design & Construction (BNDC), a consortium backed by English Electric, Babcock & Wilcox Ltd and Taylor Woodrow Construction, began in 1963. The reactors were supplied by