Npower, one of big six energy firms, is to cut 900 jobs, as the company warned it would make significant financial losses this year. The German-owned supplier blamed the cuts, about 15% of its UK workforce, on the government’s price cap on default tariffs and “intense competition” in sector over fixed deals. Npower said about 900 roles would go over the coming year and that it would consult staff over the next month. The company’s chief executive hit out at…