E.On has been penalised for overcharging customers by the energy regulator

Ofgem, the energy regulator, has fined E.On £7.75m for incorrectly charging customers exit fees and overcharging on bills. The energy company has also been forced to pay back around £400,000 to customers that may have been affected, issuing refunds of between £8 and £12. The £7.75m will be paid to Citizens Advice, the community charity, to help vulnerable consumers, Ofgem said in a statement today. In May last year E.On was fined £12m for misselling energy contracts to customers, following a two-year investigation by Ofgem. Up to half a million households were affected. Under Ofgem rules, suppliers have to give customers 30 days' notice of price rises to allow customers to switch before the increase takes effect. If a customer signals their intention to move supplier within the 30 days, they do not incur exit fees or the higher charge even if the switch occurs after the price rise.....Read more here