- 3 updates
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:
The 224% rise in complaints is "worrying" and customers should shop around to find a better deal, the Government said.
A Department of Energy and Climate Change spokeswoman said:
Calls from fed-up energy customers have soared over the first three months of this year - a 224% rise compared to the same quarter last year, the energy sector's ombudsman said.
Between January and March 2014 complaints trebled to 10,638, compared with 3,277 received during the same period last year.
Over 2,000 customers complained they had not received bills, and a further 1,474 people were frustrated about billing charges.
Some 1,000 people complained about poor customer service.
Chief Energy Ombudsman Lewis Shand Smith said: "With energy complaints trebling in the first quarter of this year and problems relating to billing the greatest concern, increased transparency is something that should be addressed."