DTE Energy Company (DTE Energy) is a diversified energy company. The Company's utility operations consist primarily of DTE Electric Company (DTE Electric) and DTE Gas Company (DTE Gas). Its segments include Electric, Gas, Gas Storage and Pipelines, Power and Industrial Projects, Energy Trading, and Corporate and Other. Its Electric segment consists of DTE Electric, which is engaged in the generation, purchase, distribution and sale of electricity to residential, commercial and industrial customers in southeastern Michigan. Its Gas segment consists principally of DTE Gas, a natural gas utility engaged in the purchase, storage, transportation, distribution and sale of natural gas in Michigan, and the sale of storage and transportation capacity. It has midstream natural gas assets in Pennsylvania and West Virginia. It holds interests in Appalachia Gathering System (AGS) and Stonewall Gas Gathering (SGG) assets. It owns and operates approximately 680 distribution substations.