Oklahoma Gas & Electric Company is a regulated electric utility company that serves over 843,000 customers in Oklahoma and Arkansas, including 1.5 million people in the Oklahoma City Metropolitan Area. It is the leading subsidiary of OGE Energy Corp., with headquarters in downtown Oklahoma City. OGE Energy is also the former parent of Enogex Inc., a natural gas pipeline business which merged with CenterPoint Energy's midstream business to form Enable Midstream in 2013, in 2021 OGE and CenterPoint sold their general partnership in Enable Midstream to Energy Transfer. OGE Energy and its subsidiaries have about 3,100 employees.
Constellation Energy Corporation is an energy company headquartered in Baltimore, Maryland, United States. The company provides electric power, natural gas, and energy management services. It has approximately two million customers across the continental United States.
Atmos Energy Corporation, headquartered in Dallas, Texas, is one of the United States' largest natural-gas-only distributors, serving about three million natural gas distribution customers in over 1,400 communities in nine states from the Blue Ridge Mountains in the East to the Rocky Mountains in the West.
Aquila, Inc. was an electricity and natural gas distribution network headquartered in Kansas City, Missouri in the United States. The company also owned and operated power generation assets. It previously operated under the name UtiliCorp United, Inc. The company at one time ranked #33 on the Fortune 500 list.
Oneok, Inc. is an American diversified corporation focused primarily on the natural gas industry, and headquartered in Tulsa, Oklahoma. The company is part of the Fortune 500 and S&P 500. Oneok was founded in 1906 as Oklahoma Natural Gas Company, but it changed its corporate name to Oneok in December 1980. It also owns major natural gas liquids (NGL) systems due to the 2005 acquisition of Koch Industries natural gas businesses.
Southern Company Gas, formerly AGL Resources, is an American Fortune 500 energy services holding company headquartered in Atlanta, Georgia. The company's operations consist of natural gas distribution, wholesale services, retail operations, and midstream operations. Southern Company Gas is one of the largest natural gas distribution companies in the United States. The company serves approximately 4.5 million utility customers through its regulated distribution subsidiaries across four states. Southern Company Gas made the Fortune 500 list in 2015, Forbes 2000 in 2006, and is a member of the S&P 500 Index. In 2016, Southern Company acquired AGL Resources and renamed it Southern Company Gas.
Southern Star Central Gas Pipeline, Inc, headquartered in Owensboro, Kentucky, is a natural gas transmission system spanning approximately 6,000 miles (9,700 km) in the Midwest and Mid-continent regions of the United States. Southern Star's employees and its pipeline system and facilities are located throughout Kansas, Oklahoma, Missouri, Wyoming, Colorado, Texas, Nebraska, and Kentucky. It serves major markets such as St. Louis, Wichita, and Kansas City. Southern Star is a locally managed, private company owned by Caisse de dépôt et placement du Québec and Ullico, Inc. The company is more commonly referred to as Southern Star. The company's FERC code is 43.
Dominion Energy, Inc., commonly referred to as Dominion, is a North American power and energy company headquartered in Richmond, Virginia that supplies electricity in parts of Virginia, North Carolina, and South Carolina and supplies natural gas to parts of Utah, Idaho and Wyoming, West Virginia, Ohio, Pennsylvania, North Carolina, South Carolina, and Georgia. Dominion also has generation facilities in Indiana, Illinois, Connecticut, and Rhode Island.
Evergy, Inc. is an American investor-owned utility (IOU) with publicly traded stock that has its headquarters in Topeka, Kansas, and in Kansas City, Missouri. The company was formed from a merger of Westar Energy of Topeka and Great Plains Energy of Kansas City, Missouri, parent company of Kansas City Power & Light. Evergy is the largest electric company in Kansas, serving more than 1.6 million residential, commercial and industrial customers in Kansas and Missouri. Evergy has a generating capacity of 16,000 megawatt electricity from its over 40 power plants in Kansas and Missouri. Evergy service territory covers 28,130 square miles (72,900 km2) in east Kansas and west Missouri. Evergy owns more than 13,700 miles (22,000 km) of transmission lines and about 52,000 miles of distribution lines.
Black Hills Corporation is a Rapid City, South Dakota diversified energy company that is an electric and gas utility in South Dakota, Montana, Wyoming, Colorado, Arkansas, Kansas, Nebraska, and Iowa. The company sells power throughout the American West.
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.
National Fuel Gas Company is a diversified energy company with $6.2 billion in assets distributed among the following five operating segments: Exploration and Production, Pipeline and Storage, Gathering, Utility, and Energy Marketing. National Fuel Gas was incorporated in 1902 and is based in Williamsville, New York.
Although there are numerous oil companies operating in Canada, as of 2009, the majority of production, refining and marketing was done by fewer than 20 of them. According to the 2013 edition of Forbes Global 2000, canoils.com and any other list that emphasizes market capitalization and revenue when sizing up companies, as of March 31, 2014 these are the largest Canada-based oil and gas companies.
Missouri Gas Energy (MGE) was a natural gas distribution company headquartered in Kansas City, Missouri in the United States, with offices in St. Joseph, Lee's Summit, Warrensburg, Joplin, Republic, Neosho and Monett. MGE served over in 155 western Missouri communities and was a division of the Southern Union Company until it was ultimately sold to the Spire Inc. Its business is regulated by the Missouri Public Service Commission.
Algonquin Power & Utilities Corp. is a Canadian renewable energy and regulated utility conglomerate with assets across North America. Algonquin actively invests in hydroelectric, wind and solar power facilities, and utility businesses, through its three operating subsidiaries: Bermuda Electric Light Company, Liberty Power and Liberty Utilities.
Southern Union Company was a natural gas utility and energy resources company based in Houston, Texas. In 2012, the company was acquired by Energy Transfer Partners.
ONE Gas, Inc. is a stand-alone, 100 percent regulated, publicly traded natural gas utility and is one of the largest natural gas utilities in the United States.
Oklahoma Natural Gas is the largest natural gas distributor in the state of Oklahoma. Originally founded in 1906, it is one of the oldest corporations in Oklahoma. Oklahoma Natural Gas is a regulated public utility which serves 871,000 customers, employing 1,100 employees. It operates 19,200 miles of service lines, pipelines and other natural gas properties. Oklahoma Natural Gas is a division of ONE Gas, Inc.
Texas Gas Service is the third largest natural gas distribution company in the U.S. state of Texas. It is a regulated public utility which serves more than 884,000 customers in 100 communities, employing 800 employees. It operates 10,900 miles of service lines, pipelines and other natural gas distribution properties. Texas Gas Service is a division of ONE Gas, Inc.
