David Cameron has told MPs energy prices are not falling as fast as he would like to reflect the fall in oil prices.
The Prime Minister's comments come as a new survey claims three in five older people will ration their heating this winter amid fears over bills.
Labour has said that more needs to be done to tackle high energy bills that are "unaffordable" for many.
Speaking to ITV News, Shadow Energy Secretary Lisa Nandy said that Government ministers need to ask themselves "Whose side are you on?"
"Are they on the side of energy companies who are failing to pass on saving to their consumers...
Or are they on the side of communities trying to power their own homes...
Are they on the side of consumers who are trying to get a reduction in their energy bills because they are, quite simply, unaffordable."
Three in five older people will ration their heating this winter amid fears over high energy bills, according to a new survey.
Older people have been warned to keep their homes warm and get a flu jab as weather experts warn of a cold snap.