Johannes Teyssen, Chief Executive Officer of German utility giant E.ON attends the company's annual news conference in Duesseldorf March 11, 2015. Germany's biggest utility on Wednesday posted its biggest net loss in history, triggered by 4.5 billion euros in writedowns it had made on ailing power assets in Southern Europe, the sad ending to a major expansion push during the last decade. REUTERS/Wolfgang Rattay (GERMANY - Tags: BUSINESS ENERGY)