The government is to publish its long-awaited draft energy bill, designed to encourage major investment in clean energy generation and help increase security of supply.

The bill is expected to outline long-term contracts to encourage investment in nuclear and renewable energy.

Energy Secretary Ed Davey was pressed by Today presenter John Humphrys as to whether the changes amounted to a subsidy for new nuclear.

"There is going to be no public subsidy for new nuclear," he said.

"What we want is a market structure that makes sure we keep the lights on.

"Unless nuclear can be price competitive - as the industry says it can be - these nuclear projects won't proceed".

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