American Transmission Co (ATC) is a transmission-only utility that provides electric transmission service in portions of Wisconsin, Michigan, Minnesota, and Illinois. The company was founded in 2001 and is headquartered in Waukesha, Wisconsin. ATC is responsible for the planning, construction, operation, and maintenance of high-voltage electric transmission lines and substations that transport electricity from power plants to local distribution facilities. The company is committed to providing reliable, cost-effective, and environmentally responsible transmission service to its customers. ATC is regulated by the Federal Energy Regulatory Commission (FERC) and operates as a subsidiary of WEC Energy Group, a diversified energy company based in Milwaukee, Wisconsin.