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 also located in Birmingham, Alabama. The company is the second largest utility company in the U.S. in terms of customer base, as of 2021. 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.
Entergy Corporation is a Fortune 500 integrated energy company engaged primarily in electric power production and retail distribution operations in the Deep South of the United States. Entergy is headquartered in New Orleans, Louisiana, and generates and distributes electric power to 3 million customers in Arkansas, Louisiana, Mississippi and Texas. Entergy has annual revenues of $11 billion and employs more than 13,000 people.
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.
The Southern California Gas Company is a utility company based in Los Angeles, California, and a subsidiary of Sempra. It is the primary provider of natural gas to Los Angeles and Southern California.
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.
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.
National Grid plc is a British multinational electricity and gas utility company headquartered in London, England. Its principal activities are in the United Kingdom, where it owns and operates electricity and natural gas transmission networks, and in the Northeastern United States, where as well as operating transmission networks, the company produces and supplies electricity and gas, providing both to customers in New York and Massachusetts.
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.
Sempra is a North American public utility holding company based in San Diego, California. The company is one of the largest utility holding companies in the United States with nearly 40 million consumers. Sempra's focus is on electric and natural gas infrastructure and its operating companies include: Southern California Gas Company (SoCalGas) and San Diego Gas & Electric (SDG&E) in Southern California; Oncor Electric Delivery Company in Texas; and Sempra Infrastructure, with offices in California and Texas.
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.
Kansas Gas Service is the largest natural gas distribution company in the U.S. state of Kansas, operating in 82 counties. It is a regulated public utility which serves 634,000 customers in 360 communities, employing 1,000 employees. In addition to owning seven interstate pipeline connections and three intrastate pipeline connections, Kansas Gas Service operates 13,500 miles of service lines, pipelines and other natural gas properties. Headquartered in Overland Park, Kansas, the company was a division of ONEOK Inc., a Tulsa-based Fortune 200 company since 1997 until ONEOK spun off Kansas Gas Service and its two other distribution companies—Oklahoma Natural Gas Company and Texas Gas Service—to form ONE Gas in 2014.
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.
Evergy, Inc. is an American investor-owned utility (IOU) with publicly traded stock with 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, parent company of Kansas City Power & Light. Evergy is the largest electric company in Kansas, serving more than 1.7 million residential, commercial and industrial customers in Kansas and Missouri. Its more than 40 power plants have generating capacity of 16,000 megawatt electricity in Kansas and Missouri. Service territory covers 28,130 square miles (72,900 km2) in east Kansas and west Missouri. It owns more than 10,100 miles (16,300 km) of transmission lines and about 52,000 miles (84,000 km) of distribution lines.
The Oklahoma Natural Gas Company Building is a historic building in Tulsa, Oklahoma, at 624 South Boston Ave. It was one of the first local Art Deco buildings built in the new Art Deco style, along with the Public Service of Oklahoma Building. This choice by the relatively conservative utility companies made the style acceptable in the city, with many Art Deco buildings built subsequently in Tulsa. The building was designed by Frank V. Kirshner and Arthur M. Atkinson. It was built of reinforced concrete, and clad in buff brick, except for the lower two stories, which are clad in limestone. The verticalness of the building is emphasized by piers rising the entire height of the facade with windows placed between the piers.
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.
UIL Holdings Corporation was a diversified energy delivery company serving a total of 690,000 electric and natural gas utility customers in 66 communities across two states, with combined total assets of over $4 billion. In 2015 it merged with Iberdrola USA to form Avangrid.
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.
