Richard Lloyd from the consumer association Which? said millions of consumers will be wondering what today's announcement on the Hinkley power station will mean for them.
He said: "There has been no transparent independent scrutiny of the price that the Government has signed up to on our behalf to pay, there needs to be a claw back if they've over paid and there needs to be a much more independent robust scrutiny of these deals."
David Cameron has insisted that plans for the UK's first nuclear power station in a generation at Hinkley was "not a deal at any price".
The Chancellor has given formal Government approval for Chinese state-run firms to buy into British nuclear power - should we be worried?