Eon

EDF, Npower and Scottish Power have refused to state whether they are likely to raise gas and electricity prices this year, following today's decision by Eon to freeze bills for the rest of 2012.

The big six energy companies – EDF, Eon, British Gas, Scottish and Southern Energy, Scottish Power and Npower – have agreed to write to customers every year to tell them the firm's best tariffs for them and how to get it, the Government will announce today.

Energy regulator Ofgem has opened an investigation into whether industry giant Eon is mis-selling to consumers.

Ovo Energy has bucked the trend of falling gas and electricity prices by announcing up to 90,000 of its customers face a hike in their bills. But will the big six follow, which would hit millions of households?

Energy giant Eon has reformed its direct debit system to stop customers being hit with huge hikes in their monthly payments.

Scottish Power has become the last of the big six energy companies to announce reductions in its tariffs.

Eon today became the latest energy supplier to cut prices when it announced a 6% fall in electricity bills, benefiting 3.7 million customers.

Npower today announced a 5% gas price cut for all customers on standard and capped tariffs from 1 February.

Complaints about energy firms have jumped over recent months, with EDF the most complained about firm, figures reveal today.

Energy supplier Ovo Energy is axing plans to increase costs for its variable rate customers due to a drop in the price it pays for gas and electricity.