What has Ofgem said?
Jonathan Brearley, chief executive of Ofgem, said: "This is a difficult time for many people, and any increase in bills will be worrying.
"But this rise – around the levels we saw in August – is a result of the wholesale cost of gas and electricity rising, which needs to be reflected in the price that we all pay.
"It is important that customers are supported and we have made clear to suppliers that we expect them to identify and offer help to those who are struggling with bills."
