By Daniel Hunter

The UK's five biggest price comparisons websites are "hiding" the best energy deals, according to a rival firm.

The Big Deal website, which also helps consumers to find cheaper energy deals, suggested that the five comparison sites are behaving unethically.

It accused the comparison sites of "hiding" deals on which they don't receive commission when the customer wants to switch "today". The Big Deal said that if consumers select "No" when asked if they want to switch 'today', non-commission deals are not filtered out, which may show cheaper deals.

The Big Deal was written to uSwitch, Compare the Market, MoneySuperMarket, Go Compare and Confused.com, to complain, but the five said their websites are transparent and adhere to Ofgem's code of practice.

Dan Plant, the editor in chief at MoneySuperMarket, said, "The option for customers to filter results - to only see products they can buy through MoneySuperMarket.com - is displayed clearly and prominently, and is necessary as some providers choose not to list products on comparison websites.

"Currently the cheapest 10 tariffs on the market are shown to all customers using our website."

"Some suppliers do not make certain tariffs available through comparison sites, so we give customers the option to exclude these from the results," said Kate Rose, the head of energy at Confused.com.

GoCompare said it doesn't have have a "buy now/today" function.

The energy regulator Ofgem is already looking into new rules to help people switch their energy supplier and save money.

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