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
Tuesday: A cloudy, cool and dull day with outbreaks of heavy rain becoming lighter and patchier.
The England cricket captain is the first Englishman and youngest player to ever achieve the landmark.
Police are appealing for news of Connor Jarvis, 19, after he did not return from a solo holiday in Marrakech as planned.