The number of complaints made against the “Big Six” energy providers has dropped by 24%, according to figures released by Ofgem.

The energy regulator said slightly fewer than five million complaints were received against the six largest suppliers during 2015, 1.5 million fewer complaints than during 2014.

The watchdog said: “Ofgem believes the number of complaints remains too high and all suppliers must continue to strive for further improvements and ensure that their customers are at the heart of everything they do.”

Publishing complaints data is designed to encourage customers to shop around amongst the suppliers, the regulator added.

Npower and ScottishPower bottom

Npower received the most complaints per 100,000 customers during 2015, although Ofgem noted that the number received each quarter fell over the course of the year.

Npower and ScottishPower “continue to be bottom for practically all customer satisfaction measures out of the larger suppliers”, Ofgem added.

Utility Warehouse received most complaints among the independent suppliers during 2015.

> View Ofgem's figures

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