Norsk Hydro ASA engages in the power production, bauxite extraction, alumina refining, aluminium smelting, remelting, and recycling activities; and provision of extruded solutions worldwide. It operates through Bauxite & Alumina, Aluminium Metal, Metal Markets, Extrusions, and Energy segments. The Bauxite & Alumina segment engages in bauxite mining activities, production of alumina, and related commercial activities, primarily the sale of alumina.