MILLIONS of people are overpaying for their energy, a year-long inquiry will reportedly say today.

The Competition and Markets Authority (CMA) probe into the energy market, launched in the wake of a pledge by Labour in 2013 to freeze prices if it won this year's general election, is expected to outline moves to encourage customers to switch to lower-cost energy providers.

The Financial Times quoted an industry executive as saying: "There are three themes to this report. The first is people are paying more than is necessary; the second is that green levies and network costs are driving bills up; the third is regulation of the sector is not joined up and transparent."

It is believed the report will announce that the so-called Big Six energy firms should not be dismantled to separate power generation and supply, and will find that the large companies have not been colluding to increase profits.

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