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Energy regulator boss faces MPs

The man charged with regulating the energy industry will answer to MPs later today after it emerged profits of Britain's "Big Six" energy suppliers multiplied five-fold to more than £1 billion since 2009.

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Govt: Profits 'are a matter for energy firms to justify'

The Department of Energy and Climate Change said it is up to the energy companies to justify their profits.

Ofgem said the 'Big Six' energy firms made an average 20% profit on energy generation. Credit: Jens Buettner/DPA/Press Association Images

A departmental spokesman said: "Profits are a matter for energy companies to justify to their customers and shareholders, but profits are needed if they are to continue to invest in Britain's energy security and infrastructure".

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