SunEdison Inc, formerly MEMC Electronic Materials, Inc is engaged in the development, manufacture and sale of silicon wafers. The Company is a developer and seller of photovoltaic energy solutions. Through Solar Materials and Solar Energy (SunEdison), it is a developer of solar energy projects. The Company operates in two segments: semiconductor materials and solar energy. The Company�s Solar Energy segment includes the operations of its old Solar Materials segment, as well as its SunEdison business. In the Semiconductor Materials, the Company offers wafers with a variety of features. The Company�s wafers vary in size, surface features, composition, purity levels, crystal properties and electrical properties. Effective July 30, 2013, Sunedison Inc acquired EchoFirst Inc.