SunEdison, formerly MEMC Electronic Materials Inc. (http://sunedisonsilicon. com), has its headquarters in St. Peters, Missouri. It started operations in 1959 and it makes semiconductor-grade wafers, granular polysilicon, ultra-high purity silane, trichlorosilane, tetrafluorosilane and sodium aluminium tetrafluoride. In February 2011, the company and Samsung entered into a 50/50 equity joint venture to build a polysilicon plant in Korea with an initial capacity of 10000 metric tons in 2013. At the end of 2011, the company closed its 6000 metric ton Merano, Italy, factory and reduced its capacity in Portland, USA, during 2012. Production capacity at the end of 2012 was ~ 10000 metric tons with estimated production of about 12000 metric tons.
SunEdison is developing solar power projects as well as acting as a solar energy provider. At the end of 2012, the company had 73 MW of photovoltaic power plants under construction and 2.6 GW of projects in the pipeline.