Hoku Scientific, Inc., through its subsidiaries, operates as a materials science company. It focuses on the manufacture of solar-grade polysilicon, which is used in photovoltaic (PV) modules; and design, engineering, and installation of turnkey PV systems and related services using solar modules purchased from third party suppliers. The company also designs, develops, and manufactures membranes, and membrane electrode assemblies for proton exchange membrane fuel cells. Its membrane electrode assemblies are designed for the residential primary power, commercial back-up, and automotive hydrogen fuel cell markets. The company was formerly known as Pacific Energy Group, Inc. and changed its name to Hoku Scientific, Inc. in July 2001. Hoku Scientific, Inc. was incorporated in 2001 and is headquartered in Kapolei, Hawaii.