Labour shadow energy minister Tom Greatrex told ITV Daybreak that more nuclear generation would help insure against an over-reliance on gas power.
"If we decide not to go with nuclear, then we're left in a world where we're going to be more and more reliant on gas," he said.
"When you look at what the energy companies have been saying is the reason why they're putting up prices significantly, it's the wholesale price of gas.
More top news
MI5 face mounting pressure over claims the IS executioner 'Jihadi John', named yesterday as a London graduate, was known to them
Labour leader Ed Miliband is due to set out his party's plans on how it would cut tuition fees.
New drug driving laws are to come into effect next week, including laws on some prescribed medications.