The sun rises behind electricity pylons near Chester, northern England October 24, 2011. REUTERS/Phil Noble LONDON, Sept 29 (Reuters) – Three more British energy suppliers have ceased to trade, regulator Ofgem said on Wednesday, leaving more than 230,000 customers potentially facing the prospect of higher bills. The failure of Enstroga, Igloo Energy and Symbio Energy has taken the tally of British energy suppliers to go bust this month to nine as wholesale energy prices have hit records. The price for households of the most widely-used energy tariffs are capped in Britain meaning some smaller firms, with less capital to hedge customer needs on the wholesale market have struggled to keep pace with costs. Igloo, the largest of the latest suppliers to cease trading, with 179,000 customers, said the price cap had made its business unsustainable. “The basis on which it’s (the cap) calculated by Ofgem is designed to favour […]