The EPR underwent Generic Design Assessment by the Office for Nuclear Regulation, along with the Westinghouse AP1000. Interim Design Acceptance Confirmations were postponed until lessons from the Fukushima Daiichi nuclear disaster had been taken into account. EDF bought British Energy in 2009. EDF planned to build 4 new EPRs, subject to electricity pricing agreement with the government. Areva has signed a strategic partnership with Rolls-Royce to support the build of EPRs. On 19 March 2013 planning consent for Hinkley Point C nuclear power station was given, but difficult negotiations with the UK government about electricity pricing, and project financing with private investors, still needed to be concluded.