dte energy (nyse: dte) is a detroit-based, diversified energy company involved in the development and management of energy-related businesses and services nationwide. built on a strong utility base, dte energy's largest operating subsidiaries are dte electric and dte gas. together, these regulated utility companies provide electric and/or gas services to more than three million residential, business and industrial customers throughout michigan. dte energy has more than 10,400 employees in utility and non-utility subsidiaries involved in a wide range of energy-related businesses nationwide. the company's growing non-utility businesses are built around the strengths, skills and assets of dte energy's electric and gas utilities.