Should we build more nuclear power stations?
Campaigners say renewable sources can play a bigger part
Energy Minister Malcolm Wicks has accused a group of MPs of "over-egging" the risk of electricity shortages.
The Commons Environmental Audit Committee had warned the UK cannot wait for a new generation of nuclear power stations and needed gas-fired stations.
A government energy review this year is expected to request more nuclear power.
Mr Wicks, who leads the review, said no decision had been taken but the extra cost of cleaner energy like nuclear was a price to pay for saving the planet.
Speaking on BBC's Radio Five Live, he said there were concerns about what do with nuclear waste and the threat of terror attacks on nuclear stations.
'Generation gap'
But he added: "I think in favour of nuclear - despite what the Lib Dems say - is the scientific evidence that nuclear is a cleaner form of energy.
"It helps us with climate change, but we've got to look at the economics, and then we've got to weigh all these things before we make our recommendation to the prime minister and the government."
Earlier the committee said the UK faced a "generation gap" which nuclear power could not bridge.