The Labour leader Ed Miliband has dismissed "scare stories" from Britain's major energy companies in response to his proposals to freeze gas and electricity prices.
The UK's biggest energy supplier, Centrica, has warned the plans could lead to potential blackouts.
But Mr Miliband insists he would hit the "re-set" button for a whole industry as "somebody's got to call time on a market that is not working".
ITV News' Political Editor Tom Bradby reports.
As Ed Miliband clashes with the energy giants on prices, it is worth knowing how your expensive energy bills are actually made up.
A leading competition lawyer says an energy price freeze could leave Labour open to challenges from the courts or the European Commission.
Whether or not you approve of a state intervention into industry, there are at least two big potential obstacles for an energy price freeze.