Soaring energy bills have left an estimated 5.5 million UK households in debt to their gas and electricity suppliers.
Research revealed that a massive £728 million is owed to energy suppliers and is part of a backlog that saw gas and electricity prices rise by 42% in 2008.
The effects of the prices hikes are still being felt two years later with the average customer owing £132 in debt, according to research from price comparison site uSwitch.com. Bill prices did drop in 2009 but only by 4% on average.