Britain's big six energy companies have enjoyed a £3.3 billion windfall in profits over the last three years, Labour has claimed.
Shadow energy and climate change secretary Caroline Flint has criticised David Cameron's government for failing to reform the "broken" energy market at a time when families are struggling with a "cost of living crisis".
Writing on The Huffington Post UK she said: "David Cameron is so out of touch that he doesn't think the energy companies are responsible for rising bills - he thinks households are to blame.
"That's why he spends so much time tinkering will tariffs and telling people to switch around. What he's actually saying is that it's down to you. You're on your own."
Flint added: "People in Britain know that, rather than never having had it so good as the Tories try to tell them, rising energy bills are one of the main reasons they are finding it harder and harder to make ends meet and are having to make their money stretch further all the time."
"In 2009, Britain's big six energy companies made just over £2 billion in profit. Last year it was nearly £4 billion.
"Overall, in the last three years, the energy giants have enjoyed a huge windfall of £3.3 billion in extra profits. That £3.3 billion on top of the profits they were already making."