Boris Johnson is preparing to announce an in-principle agreement to offer funding to the Sizewell C reactor in Suffolk this week.
The outgoing prime minister is expected to give approval in the coming days for the nuclear power station costing up to £30bn.
Johnson said yesterday, “it is going to be tough through to next year,” because of the rising energy bills, but added that his successor would “provide a further package of support for helping people with the cost of energy”.