DTE Energy Company engages in the utility operations. The company's Electric segment generates, purchases, distributes, and sells electricity to approximately 2.3 million residential, commercial, and industrial customers in southeastern Michigan. It generates electricity through fossil-fuel, hydroelectric pumped storage, and nuclear plants, as well as wind and other renewable assets. This segment owns and operates approximately 698 distribution substations and 449,800 line transformers. The company's Gas segment purchases, stores, transports, distributes, and sells natural gas to approximately 1.3 million residential, commercial, and industrial customers throughout Michigan and sells storage and transportation capacity. This segment has approximately 20,000 miles of distribution mains 1,304,000 service pipelines and 1,305,000 active meters, as well as owns approximately 2,000 miles of transmission pipelines. The company's Power and Industrial Projects segment offers metallurgical coke pulverized coal and petroleum coke to the steel, pulp and paper, and other industries and power, steam and chilled water production, and wastewater treatment services, as well as supplies compressed air to industrial customers. Its Energy Trading segment engages in power, natural gas, and environmental marketing and trading structured transactions and the optimization of contracted natural gas pipeline transportation and storage positions. The company was founded in 1903 and is headquartered in Detroit, Michigan.