WEC Energy Group, Inc., through its subsidiaries, provides regulated natural gas and electricity, and nonregulated renewable energy services in the United States. The company operates through six segments: Wisconsin, Illinois, Other States, Electric Transmission, Non-Utility Energy Infrastructure, and Corporate and Other. It generates and distributes electricity from coal, natural gas, oil, hydroelectric, wind, and biomass sources; provides electricity transmission services; offers retail natural gas distribution services; transports natural gas; and generates, distributes, and sells steam. The company offers electricity to approximately 1.6 million residential, small and large commercial and industrial, and other customers; and natural gas to 2.9 million residential, and commercial and industrial customers. As of December 31, 2019, it operated approximately 36,500 miles of overhead distribution lines and 34,100 miles of underground distribution cable, as well as approximately 500 distribution substations and 503,200 line transformers; and approximately 49,500 miles of natural gas distribution mains, as well as 1,200 miles of natural gas transmission mains. The company was formerly known as Wisconsin Energy Corporation and changed its name to WEC Energy Group, Inc. in June 2015. WEC Energy Group, Inc. was incorporated in 1981 and is headquartered in Milwaukee, Wisconsin.