A spokeswoman for gas and electricity providers dismissed suggestions the sharp rise in complaints was a sign of a poor energy service.
Energy companies resolve most complaints "within a few working days", the spokeswoman for Energy UK said:
If a customer has any concerns relating to their bills, they should contact their provider as soon as they can, and if possible have an up-to-date meter reading to hand which will ensure their bill is as accurate as possible.
Energy companies work very hard to resolve problems and most complaints are fixed within a few working days with no more than a phone call.
More top news
Friends remember "amazing" Adam Pritchard, who died after apparently plunging down down a sharp drop while cycling with his sister.
This year's Pride in London event will include a minute's silence to commemorate the victims of the Orlando shooting.
The mother of a five-year-old girl who was found alone at a bus stop in Brighton on Friday has been found after a police appeal.