British power giant Drax could invest up to $12.5 billion developing biomass plants with carbon capture and storage (BECCS) in the United States over the next decade.    Drax, which generates around 6% of Britain's electricity, said it is still committed to the UK but sees opportunities in the U.S. for its BECCS technology. Its new Houton-based business, Elimini, is reviewing more than 20 potential sites for BECCS projects and has around 100 staff.    Elimini plans to have its first U.S. project up and running by the end ...