The Southern Company is an American electric utility holding company based in the southern United States. It is headquartered in Atlanta, Georgia, with executive offices also located in Birmingham, Alabama. The company is currently the 16th largest utility company in the world and the fourth largest in the U.S. Through its subsidiaries it owns and operates more than 42,000 megawatts of generation capacity and serves 4.3 million customers in Alabama, Georgia, Florida, and Mississippi. Southern Company’s regulated regional electric utilities serve a 120,000-square-mile (310,000 km) territory with 27,000 miles (43,000 km) of distribution lines.