WEC Energy Group, Inc. provides regulated natural gas and electricity, as well as renewable and nonregulated renewable energy services in the United States through its subsidiaries. It operates through Wisconsin, Illinois, Other States, Electric Transmission, and Non-Utility Energy Infrastructure segments. The company generates and distributes electricity from coal, natural gas, oil, nuclear, and renewable sources such as wind, solar, hydroelectric, and biomass, and also distributes natural gas. It owns and operates electric transmission systems and generates, distributes, and sells steam. As of December 31, 2025, it operated approximately 35,200 miles of overhead distribution lines, 37,600 miles of underground distribution cables, 420 electric distribution substations, 649,500 line transformers, 47,200 miles of natural gas distribution mains, 1,300 miles of natural gas transmission mains, 2.4 million natural gas lateral services, 510 natural gas distribution and transmission gate stations, and 67.0 billion cubic feet of working gas capacity in underground storage. Formerly Wisconsin Energy Corporation, it changed its name to WEC Energy Group, Inc. in June 2015. Founded in 1896, it is headquartered in Milwaukee, Wisconsin.