Boris Johnson promised £700 million of funding for the Sizewell C nuclear power project as part of a drive to improve the UK’s energy security.
“We need to pull our national finger out and get on with Sizewell C,” Mr Johnson said in his final major policy speech as Prime Minister.
“That’s why we’re putting £700 million into the deal, just part of the £1.7 billion of Government funding available for developing a large-scale nuclear project to final investment stage in this Parliament.
“In the course of the next few weeks I am absolutely confident that it will get over the line.”
He said it would be “madness” not to go ahead with the project which would “fix the energy needs, not just of this generation but of the next”.
Mr Johnson will leave office on Tuesday, handing power to either Liz Truss or Rishi Sunak following the Tory leadership contest.
He said: “I say to you, with the prophetic candour and clarity of one who is about to hand over the torch of office, I say go nuclear and go large and go with Sizewell C.”
Downing Street was unable to give further details about the funding announcement and EDF has not yet responded.
The total cost of the Sizewell C project could be around £20 billion, according to reports.
We need to pull our national finger out and get on with Sizewell C
Mr Johnson, in a speech at Sizewell, said there had been a “paralysis over British nuclear energy”, blaming successive governments for failing to invest in new reactors.
“Yes, nuclear always looks – when you begin – it always looks relatively expensive to build and to run,” he said.
“But look at what’s happening today, look at the results of Putin’s war. It is certainly cheap by comparison with hydrocarbons today.”
He said that if the under-construction Hinkley Point C in Somerset was operating now “it would be cutting our national fuel bills by £3 billion”.
Mr Johnson also highlighted the importance of offshore wind and appeared to take aim at supporters of fracking such as Ms Truss.
He said: “Because of the activism of the Government we’re now racing towards our target – we will hit it – of 50 gigawatts of offshore wind by 2030.
“Fifty gigawatts is a huge amount, that’s roughly half the electricity consumption of this country, from offshore wind.
“I tell everybody who thinks ‘hydrocarbons are the only answer, we should get fracking’ and all that, offshore wind is now the cheapest form of electricity in this country. Offshore wind is nine times cheaper than gas.”