A man goes through a revolving door at the POSCO headquarters in Seoul August 30, 2010. South Korean steelmaker POSCO is considering a takeover of Norway's Elkem, a maker of silicon for solar panels, the CEO of the South Korean group said, in a move that would give the world's No.3 steelmaker a presence in the fast growing renewable energy materials space. REUTERS/Jo Yong-Hak (SOUTH KOREA - Tags: POLITICS BUSINESS ENERGY)