Energy Secretary Edward Davey insists that there will not be a direct subsidy of new nuclear, but cannot say the cost will not end up with the taxpayer or consumer.
He says that the Horizon deal with Hitachi is "a real vote of confidence from foreign company" in the UK.
Spades will be in the ground at Oldbury and Anglesey in 2016 or 2017 at the very earliest.
More top news
The Government may be about to announce a new levy on council tax of up to 2% to replenish social care budgets.
How do you solve a £4.4 billion hole like tax credits? At 12.30pm on Wednesday, we'll find out.
A mother and her boyfriend have been charged over the death of a 19-month-old girl who became trapped inside an oven and was burned.