Which? 'shocked' energy bill price rises
12 October 2012 Last updated at 16:12 BST
Richard Lloyd of consumer group Which? has criticised the opacity and lack of competition in the energy market following increased gas and electricity prices in the UK.
He said: "Everybody knows that this is a market that is not competitive, not properly working for consumers".
British Gas, the UK's biggest energy supplier, raised its charges for both types of fuel by an average of 6%, adding £80 a year to the average dual fuel bill.
Npower will increase the price of gas by an average of 8.8% and electricity by 9.1% from 26 November.