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.
Energy Future Holdings Corporation is an electric utility company headquartered in Energy Plaza in Downtown Dallas, Texas, United States. The majority of the company's power generation is through coal and nuclear power plants. From 1998 to 2007, the company was known as TXU Corporation until its $45 billion leveraged buyout by Kohlberg Kravis Roberts, TPG Capital and Goldman Sachs Capital Partners. That purchase was the largest leveraged buyout in history. As of 2019, TXU Energy is a subsidiary of publicly traded Vistra Energy.
Emera Incorporated is a publicly traded Canadian multinational energy holding company based in Halifax, Nova Scotia. Created in 1998 during the privatization of Nova Scotia Power, a provincial Crown corporation, Emera now invests in regulated electricity generation as well as transmission and distribution across North America and the Caribbean.
Puget Sound Energy, Inc. (PSE) is an energy utility company based in the U.S. state of Washington that provides electrical power and natural gas to the Puget Sound region. The utility serves electricity to more than 1.2 million customers in Island, King, Kitsap, Kittitas, Pierce, Skagit, Thurston, and Whatcom counties, and provides natural gas to 877,000 customers in King, Kittitas, Lewis, Pierce, Snohomish and Thurston counties. The company's electric and natural gas service area spans 6,000 square miles (16,000 km2).
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.
TECO Energy Inc. is an energy-related holding company based in Tampa, Florida, and a subsidiary of Emera Incorporated. TECO Energy has several subsidiaries: Tampa Electric, which provides electricity to the Tampa Bay Area and parts of Central Florida; Peoples Gas Company, which provides natural gas throughout Florida; and TECO Services, which provides IT, HR, legal, facilities, and other services to current and former TECO subsidiaries. Previously the company was in the S&P 500 before it became private due its acquisition by Emera.
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.
Vectren Corporation was a Fortune 1000 energy holding company headquartered in Evansville, Indiana. Through its utility subsidiaries, the company distributed natural gas to approximately one million business and residential customers in Indiana and Ohio. It also distributed electricity to 141,000 customers and had 1,425 MW of primarily coal-fired generating capacity in Indiana. Vectren's nonutility subsidiaries and affiliates offered energy-related products and services to customers throughout the Midwest and Southeast. These included energy performance services and energy infrastructure services.
The Union Electric Company of Missouri was an electric power utility that was organized in 1902 and grew to be one of the large U.S. companies listed among the S&P 500. In 1997, its holding company merged with a smaller neighboring utility, Central Illinois Public Service Company through its holding company, CIPSCO Inc., to form Ameren Corporation based in St. Louis, Missouri.
Enmax Corporation is a vertically-integrated utility with operations across Alberta, Canada, and in Maine, US.
Integrys Energy Group, Inc. was an American energy company headquartered in Chicago, Illinois. It was formed by the merger of WPS Resources Corp. and Peoples Energy Corp. on February 21, 2007. The chairman, President, and chief executive officer was Charles A. Schrock. On June 23, 2014, Integrys announced that it was being acquired by Wisconsin Energy Corporation for $9.1 billion. Also in 2014, Integrys entered into an agreement to sell 100% of the Upper Peninsula Power Company (UPPCO) to Balfour Beatty Infrastructure Partners LP for $298.9 million.
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.
Alliant Energy Corporation is a public utility holding company headquartered in Madison, Wisconsin, providing power in Iowa and Wisconsin.
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).
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.
Énergir, formerly known as Gaz Métro, is an energy company with 535,000 customers in Quebec and the northeastern United States. It is the largest natural gas distribution company in Quebec, and, through subsidiaries, also produces electricity from wind. In the United States the company operates through subsidiaries in seventeen states, where it produces electricity from hydroelectric, wind and solar sources, in addition to being the leading electricity distributor and the sole natural gas distributor in Vermont.
Madison Gas and Electric Company (MGE) is the primary subsidiary of MGE Energy, Inc.. As a regulated utility, it primarily serves the Madison, Wisconsin metropolitan area with electricity, gas and green energy options.
Cleco Corporate Holdings LLC is an electric power company headquartered in the Central Louisiana city Pineville. It operates a regulated electric utility company, Cleco Power, that serves approximately 290,000 retail customers in Louisiana. Cleco also operates an unregulated wholesale electricity business.
CH Energy Group, Inc. is most known for its subsidiary Central Hudson Gas & Electric, commonly known as Central Hudson. Central Hudson Gas & Electric delivers electricity and natural gas to residents of a 2,600-square-mile (6,700 km2) service territory that extends north from the suburbs of metropolitan New York City to the Capital District at Albany. It is a subsidiary of Fortis Inc., a diversified electric utility holding company based in Canada, though Central Hudson is headquartered in Poughkeepsie, New York.
Unitil Corporation is an interstate electricity and natural gas utility company that provides services for New Hampshire, Massachusetts and Maine. Its earliest predecessor company, the Portland Gas Light Company, was founded in Maine in 1849. The current company was set up in 1984 and is based in New Hampshire. With a market cap of 686.51M, it provides electric services to about 102,400 customers and natural gas to over 75,900 customers. The service territory of Unitil includes business districts and recreational centers as well as commercial and industrial business, such as electronic component manufacturers and education institutes. The company has an enterprise value of $766.54 million. The non-utility business is operated through the company's subsidiary, U-source, which is a national energy brokering and consulting company.
US$1.731 billion (FY 2015)