The shadow chancellor Ed Balls has voiced sceptism over the coalition's plans to reduce energy bills.
He told the BBC's Andrew Marr: "What they're doing is shifting from energy bills on to the taxpayer, that's not a cut that's just a shifting of the burden".
"Fundamentally, what's happening is that energy prices are going up this Winter by £120-130, a £50 cut when they're going up by twice that, means that people are still paying more in energy."
Mr Balls added: "I set two tests for George [Osborne]- one, would he stop bills rising? Secondly, would the energy companies pay?
"I would say to George, while the Prime Minister is in China, get back to the drawing board, come up with a policy, we've had lots of u-turns already, do another one, freeze the bills, take Ed Miliband's policy - that would be wise."
The coalition has unveiled measures it says will knock £50 off the average energy bill, but some of that cost will be absorbed by taxpayers.
The Government has laid out its ideas on how to cut energy bills this winter - but the plan has been put together in haste.