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UNS Energy Corporation, formerly UniSource Energy Corporation, is a holding company. The Company owns the outstanding common stock of Tucson Electric Power Company (TEP), UniSource Energy Services, Inc. (UES), UniSource Energy Development Company (UED), and Millennium Energy Holdings, Inc. (Millennium). It operates in three segments: TEP, UNS Gas, Inc. (UNS Gas) and UNS Electric, Inc. (UNS Electric). TEP is an electric utility serving the community of Tucson, Arizona. UNS Gas is a gas distribution company serving approximately 148,000 retail customers in Mohave, Yavapai, Coconino, and Navajo counties in northern Arizona, as well as Santa Cruz County in southeastern Arizona. UNS Electric is a vertically integrated electric utility company serving approximately 91,000 retail customers in Mohave and Santa Cruz counties. In July 2011, UNS Electric purchased the Black Mountain Generating Station (BMGS) from UED.

UQM Technologies, Inc., together with its subsidiaries, develops, manufactures, and sells electric motors, generators, power electronic controllers, and fuel cell compressors in the United states and internationally. The company offers propulsion motors and generators, auxiliary motors, and electronic controls and DC-to-DC converters for electric, hybrid electric, plug-in hybrid electric, and fuel cell applications. It also provides research, development, and application engineering contract services. The company sells its products to original equipment manufacturers (OEMs), tier 1 suppliers of OEMs, and vehicle integrators in various markets, including passenger buses, mining vehicles, marine, military, aircraft HVAC, airplane tugs, automobiles, and other markets, as well as commercial trucks, vans, and shuttles. UQM Technologies, Inc. was founded in 1967 and is headquartered in Longmont, Colorado.