Southern Company is an American gas and electric utility holding company based in the Southern United States. It is headquartered in Atlanta, Georgia, with executive offices located in Birmingham, Alabama. As of 2021 it is the second largest utility company in the U.S. in terms of customer base. Through its subsidiaries it serves 9 million gas and electric utility customers in 6 states. Southern Company's regulated regional electric utilities serve a 120,000-square-mile (310,000 km2) territory with 27,000 miles (43,000 km) of distribution lines.
Eversource Energy is a publicly traded, Fortune 500 energy company headquartered in Hartford, Connecticut, and Boston, Massachusetts, with several regulated subsidiaries offering retail electricity, natural gas service and water service to approximately 4 million customers in Connecticut, Massachusetts, and New Hampshire.
Xcel Energy Inc. is a U.S. regulated electric utility and natural gas delivery company based in Minneapolis, Minnesota, serving more than 3.7 million electric customers and 2.1 million natural gas customers across parts of eight states. It consists of four operating subsidiaries: Northern States Power-Minnesota, Northern States Power-Wisconsin, Public Service Company of Colorado, and Southwestern Public Service Co.
Northern States Power Company (NYSE: NSP) was a publicly traded S&P 500 electric and natural gas utility holding company based in Minneapolis, Minnesota, that is now a subsidiary of Xcel Energy.
Exelon Corporation is a public utility headquartered in Chicago, and incorporated in Pennsylvania. Exelon is the largest electric parent company in the United States by revenue and is the largest regulated electric utility in the United States with approximately 10 million customers. The company is ranked 99th on the Fortune 500.
Constellation Energy Corporation is an American energy company headquartered in Baltimore, Maryland. The company provides electric power, natural gas, and energy management services. It has approximately two million customers across the continental United States.
DTE Energy is a Detroit-based diversified energy company involved in the development and management of energy-related businesses and services in the United States and Canada. Its operating units include an electric utility serving 2.2 million customers and a natural gas utility serving 1.3 million customers in Michigan.
Delmarva Power is an energy company that provides electricity and natural gas to customers on portions of the Delmarva Peninsula in the states of Delaware and Maryland. The company is a subsidiary of Exelon.
CenterPoint Energy, Inc. is an American utility company based in Houston, Texas, that provides electric and natural gas utility to customers in several markets in the American states of Indiana, Ohio, Louisiana, Minnesota, Mississippi, and Texas. Part of the Fortune 500, the company was formerly known as Reliant Energy, NorAm Energy, Houston Industries, and HL&P. The company is headquartered in the CenterPoint Energy Tower at 1111 Louisiana Street in Downtown Houston.
NiSource Inc. is one of the largest fully regulated utility companies in the United States, serving approximately 3.5 million natural gas customers and 500,000 electric customers across six states through its local Columbia Gas and NIPSCO brands. The company, based in Merrillville, Indiana, has more than 8,000 employees. As of 2018, NiSource is the sole Indiana-based utility company.
The Upper Peninsula Power Company (UPPCO) is an electrical power utility provider headquartered in Marquette, Michigan with service centers in Escanaba, Houghton, Iron River, Ishpeming, Munising and Ontonagon.
SCANA Corporation was an American regulated electric and natural gas public utility. The company was based in Cayce, South Carolina, a suburb of Columbia, South Carolina. Following the Nukegate scandal, the company's stock fell and the company was in disrepair. In January 2019, SCANA was acquired by Dominion Energy. The corporate name SCANA was not an acronym, but was taken from the letters in South Carolina.
WEC Energy Group is an American company based in Milwaukee, Wisconsin that provides electricity and natural gas to 4.4 million customers across four states.
Peoples Gas is a gas utility subsidiary of WEC Energy Group servicing the city of Chicago, Illinois and its northern suburbs.
Alliant Energy Corporation is a public utility holding company headquartered in Madison, Wisconsin, providing power in Iowa and Wisconsin.
The Edison Electric Institute (EEI) is an association that represents all U.S. investor-owned electric companies.
Columbia Energy Center is a base load, sub-bituminous coal-fired, electrical power station located south of Portage in the Town of Pacific, Columbia County, Wisconsin. Ownership is 46.2% Wisconsin Power and Light Company, 31.8% Wisconsin Public Service, and 22% Madison Gas and Electric (MGE).
Wisconsin Public Service Corporation (WPS) is a utility company headquartered in Green Bay, Wisconsin. The company serves more than 450,000 electric customers and more than 333,000 natural gas customers in 27 counties in eastern, northeastern northern, and central Wisconsin, and a small portion of Michigan's Upper Peninsula.
MDU Resources Group, Inc. is a U.S.-based corporation supplying products and services to regulated energy delivery and utilities related construction materials and services businesses. It is headquartered in Bismarck, North Dakota, and operates in 48 states.
PECO, formerly the Philadelphia Electric Company, is an energy company founded in 1881 and incorporated in 1929. It became part of Exelon Corporation in 2000 when it merged with Commonwealth Edison's holding company Unicom Corp.
