A 245-tonne dome has been lifted onto a reactor building at the first nuclear plant to be built in Britain for 30 years.

EDF Energy said twin nuclear reactors at Hinkley Point C in Somerset would provide zero-carbon electricity for more than six million homes in Britain when the site opened.

The second dome was installed earlier using a “build and repeat” method, using off-site prefabrication and experience from installing the first dome on the first reactor.