Norsk Hydro ASA is a Norwegian aluminium and renewable energy company, headquartered in Oslo. Hydro is the fourth largest integrated aluminium company worldwide. It has operations in some 40 countries around the world and is active on all continents. The Norwegian state holds a 43.8 percent ownership interest in the company, which employs approximately 23,000 people. Svein Richard Brandtzaeg has been the CEO since 2009. The company had a significant presence in the oil and gas industry until October 2007, when these operations were merged with rival Statoil to form StatoilHydro (in 2009 changed to Statoil). Notodden remains home to the Hydrogen Technologies division, a world leader in alkaline electrolysis technology. Financed by the Swedish Wallenberg family and French banks, the company was founded on December 2, 1905 as Norsk hydro-elektrisk Kvaelstofaktieselskab (lit.
Contributions by Arsenikk, Gr1st, and 22.214.171.124.