Investors will be able to register their interest in buying a chunk of the new Sizewell C nuclear power station at Leiston from today.
The site - next to French energy company EDF's Sizewell B power plant - is set to house two of the most powerful nuclear reactors in the world providing electricity for up to 6m homes.
Now energy security and net zero secretary Claire Coutinho has confirmed that applications are open for investors to join the UK state in investing in the plant.
The government has already ploughed £700m into the scheme - and earmarked a further £511m towards project development and construction preparations.
It also wants to see a revival in Small Modular Reactors with the aim of generating up to a quarter of the UK's energy needs from nuclear by 2050.
The government and lead developer and energy company EDF say they are seeking "companies with substantial experience in the delivery of major infrastructure projects".
Ms Coutinho, said it was "an exciting opportunity" and would create thousands of jobs. Investors will be subject to "strict security tests", the government said.
"We are focused on securing good value for taxpayers and look forward to seeing strong and competitive bids to be a part of this exciting project," she said.
Sizewell C joint managing director Julia Pyke said there was a "positive response" from investors during market testing.
"Investors who participate in Sizewell C would be contributing to one of the biggest clean energy projects in the UK. They should feel confident in our proposals as we are building a replica project with government backing, a mature reactor design and a workforce ready to build it," she said.
Companies will have to demonstrate that they meet the key criteria for entering negotiations on a potential equity stake in Sizewell C.
Ministers says they will be seeking value for money, while bolstering energy security.
Minister for nuclear and networks Andrew Bowie said: "I look forward to seeing strong and competitive bids from potential investors to bring new expertise and experience into the company to help deliver this critical piece of national infrastructure."
EDF Energy chief executive Simone Rossi, said together with Hinkley Point C in Somerset, Sizewell C would be "the bedrock" of Britain's new nuclear fleet.
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