95 per cent of dual-fuel customers of the largest energy firms have missed out on savings of more than £200 a year by not switching tariffs or suppliers between 2012 and 2014, according to an investigation by the Competition Markets Authority (CMA).

Citizens Advice is calling for the investigation to result in value for money for all energy customers.

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Gillian Guy, chief executive of Citizens Advice, said: "Too few are getting value for money on their energy costs. The Competition and Markets Authority has confirmed that millions of consumers are left paying much higher prices because they are not among the savviest who have switched. Loyal customers on standard tariffs, prepayment meter users and those who don’t or can’t go online to find the best deal are losing out.

"The energy investigation must leave all consumers in complete confidence they are getting value for money on their bills."

(CD/IT)