Energy suppliers in the UK need to convince consumers that their prices are justified, Which? says.
Following the news that British Gas saw a profit of £724 million in 2010, the consumer watchdog has commented that people will need to be reassured that their energy prices are fair.
The supplier's profits showed a 24 per cent increase from the previous year.
Chief executive of Which? Peter Vicary-Smith comments that energy prices are one of consumers' key concerns at the present time - and that many struggle to pay their bills due to rising prices.
"With a large portion of these profits likely to have come from UK households, it's up to British Gas and the rest of the Big Six to convince their customers that energy prices are fair," he adds.
Last month, research from uSwitch.com revealed that more than three quarters of households in the UK rationed their winter energy use in order to save money.
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