Ofgem also investigating three other energy companies

Ofgem is also conducting mis-selling investigations into Scottish Power, Npower and E.ON.

In April 2012, EDF Energy agreed to pay a £4.5m fine to help vulnerable customers for breaching marketing licence conditions.

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SSE record £10m mis-selling fine

Energy giant SSE is to be fined £10.5 million for mis-selling in what would be the largest-ever penalty imposed on a supplier, regulator Ofgem said.