“Hinkley is set to be the most expensive object on Earth… best guesses say Hinkley could pass £24bn ($35bn),” said the environmental charity Greenpeace last month as it launched a petition against the project.
This figure includes an estimate for paying interest on borrowed money, but the financing arrangements for Hinkley C are so opaque that it is impossible to calculate exactly what the final cost will be.
Even if you stick with the expense of construction alone, though, the price is still high – the main contractor, EDF, puts it at £18bn ($26bn).
http://www.bbc.co.uk/news/magazine-36160368