Energy suppliers are failing to point out where customers can make savings by switching accounts, it has emerged.
Under Ofgem rules, suppliers must send their customers annual statements, which breaks down household usage and explains how much it costs.
The energy bills should also include information about how to get a better deal by stating the name of the account holder's tariff and a reminder that the customer can switch gas or electricity provider.
However, the BBC reports that the statements do not provide information about checking an energy comparison website and finding better deals online.
The broadcaster notes that an Ofgem spokesman says the reason for this is that many internet-only deals are time-limited or have certain conditions attached.
Meanwhile, British Gas has been criticised for announcing a seven per cent hike in domestic tariff prices in the same week that parent company Centrica posted projections of £2.2 billion operating profits.
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