MEMC Electronic Materials, Inc. engages in the development, manufacture, and sale of silicon wafers. The company also develops and sells photovoltaic energy solutions. It operates in two segments, Semiconductor Materials and Solar Energy. The Semiconductor Materials segment offers wafers for semiconductor applications, including prime polished wafers, such as OPTIA and annealed products; epitaxial wafers, including AEGIS wafers; test/monitor wafers for testing semiconductor fabrication lines and processes; and silicon-on-insulator wafers used in the chip making process. Its wafers are used as the starting material for the manufacture of various types of semiconductor devices, including microprocessor, memory, logic, and power devices. The Solar Energy segment provides solar energy services that integrate the design, installation, financing, monitoring, operation, and maintenance portions of the downstream solar market. This segment also manufactures polysilicon, silicon wafers, and solar modules. As of December 31, 2012, the company interconnected approximately 675 solar power systems representing 989 MW of solar energy generating capacity. The company serves semiconductor device manufacturers, including the memory, microprocessor, and ASIC manufacturers; foundries; national retail chains and real estate property management firms; federal, state, and municipal governments; and utilities. The company markets its semiconductor wafer products primarily through a direct sales force, as well as through local or regional solar channel partners. MEMC Electronic Materials, Inc. was founded in 1984 and is headquartered in St. Peters, Missouri.