NextEra Energy, Inc., through its subsidiaries, generates, transmits, distributes, and sells electric power to retail and wholesale customers in North America. The company generates electricity through wind, solar, nuclear, coal, and natural gas facilities. It also develops, constructs, and operates long-term contracted assets that consists of clean energy solutions, such as renewable generation facilities, battery storage projects, and electric transmission facilities; sells energy commodities; and owns, develops, constructs, manages and operates electric generation facilities in wholesale energy markets. As of December 31, 2022, the company had approximately 32,100 megawatts of net generating capacity; approximately 88,000 circuit miles of transmission and distribution lines; and 871 substations. It serves approximately 12 million people through approximately 5.8 million customer accounts in the east and lower west coasts of Florida. The company was formerly known as FPL Group, Inc. and changed its name to NextEra Energy, Inc. in 2010. NextEra Energy, Inc. was founded in 1925 and is headquartered in Juno Beach, Florida.

The Southern Company, through its subsidiaries, engages in the generation, transmission, and distribution of electricity. It operates through three segments: Gas Distribution Operations, Gas Pipeline Investments, and Gas Marketing Services. The company also develops, constructs, acquires, owns, and manages power generation assets, including renewable energy projects and sells electricity in the wholesale market; and distributes natural gas in Illinois, Georgia, Virginia, and Tennessee, as well as provides gas marketing services, gas distribution operations, and gas pipeline investments operations. In addition, it constructs, operates, and maintains 77,591 miles of natural gas pipelines and 14 storage facilities with total capacity of 157 Bcf to provide natural gas to residential, commercial, and industrial customers. It serves approximately 8.8 million electric and gas utility customers. Further, the company offers digital wireless communications and fiber optics services. The Southern Company was incorporated in 1945 and is headquartered in Atlanta, Georgia.

Duke Energy Corporation, together with its subsidiaries, operates as an energy company in the United States. It operates through two segments, Electric Utilities and Infrastructure (EU&I) and Gas Utilities and Infrastructure (GU&I). The EU&I segment generates, transmits, distributes, and sells electricity in the Carolinas, Florida, and the Midwest; and uses coal, hydroelectric, natural gas, oil, solar and wind sources, renewables, and nuclear fuel to generate electricity. This segment also engages in the wholesale of electricity to municipalities, electric cooperative utilities, and load-serving entities. The GU&I segment distributes natural gas to residential, commercial, industrial, and power generation natural gas customers; and invests in pipeline transmission projects, renewable natural gas projects, and natural gas storage facilities. The company was formerly known as Duke Energy Holding Corp. and changed its name to Duke Energy Corporation in April 2006. The company was founded in 1904 and is headquartered in Charlotte, North Carolina.

Constellation Energy Corporation generates and sells electricity in the United States. The company operates through five segments: Mid-Atlantic, Midwest, New York, ERCOT, and Other Power Regions. It sells natural gas, and other energy-related products and services. The company has approximately 32,355 megawatts of generating capacity consisting of nuclear, wind, solar, natural gas, and hydroelectric assets. It serves distribution utilities; municipalities; cooperatives; and commercial, industrial, governmental, and residential customers. The company was incorporated in 2021 and is headquartered in Baltimore, Maryland.

American Electric Power Company, Inc., an electric public utility holding company, engages in the generation, transmission, and distribution of electricity for sale to retail and wholesale customers in the United States. It operates through Vertically Integrated Utilities, Transmission and Distribution Utilities, AEP Transmission Holdco, and Generation & Marketing segments. The company generates electricity using coal and lignite, natural gas, renewable, nuclear, hydro, solar, wind, and other energy sources. It also supplies and markets electric power at wholesale to other electric utility companies, rural electric cooperatives, municipalities, and other market participants. The company was incorporated in 1906 and is headquartered in Columbus, Ohio.

Entergy Corporation, together with its subsidiaries, engages in the production and retail distribution of electricity in the United States. The company operates in two segments, Utility and Entergy Wholesale Commodities. The Utility segment generates, transmits, distributes, and sells electric power in portions of Arkansas, Louisiana, Mississippi, and Texas, including the City of New Orleans; and distributes natural gas. The Entergy Wholesale Commodities segment engages in the ownership, operation, and decommissioning of nuclear power plants; and ownership of interests in non-nuclear power plants that sell electric power to wholesale customers, as well as provides services to other nuclear power plant owners. It generates electricity through gas, nuclear, coal, hydro, and solar power sources. The company sells energy to retail power providers, utilities, electric power co-operatives, power trading organizations, and other power generation companies. The company's power plants have approximately 24,000 megawatts (MW) of electric generating capacity, which include 5,000 MW of nuclear power. It delivers electricity to 3 million utility customers in Arkansas, Louisiana, Mississippi, and Texas. Entergy Corporation was founded in 1913 and is headquartered in New Orleans, Louisiana.

Dominion Energy, Inc. produces and distributes energy in the United States. It operates through four segments: Dominion Energy Virginia, Gas Distribution, Dominion Energy South Carolina, and Contracted Assets. The Dominion Energy Virginia segment generates, transmits, and distributes regulated electricity to approximately 2.7 million residential, commercial, industrial, and governmental customers in Virginia and North Carolina. The Gas Distribution segment is involved in the regulated natural gas sales, transportation, gathering, storage, and distribution operations in Ohio, North Carolina, Utah, southwestern Wyoming, and southeastern Idaho that serve approximately 3.0 million residential, commercial and industrial customers. It also has nonregulated renewable natural gas facilities in operation. The Dominion Energy South Carolina segment generates, transmits, and distributes electricity to approximately 782,000 customers in the central, southern, and southwestern portions of South Carolina; and distributes natural gas to approximately 435,000 residential, commercial, and industrial customers in South Carolina. The Contracted Assets segment is involved in the nonregulated long-term contracted renewable electric generation and solar generation facility development operations; and gas transportation, LNG import, and storage operations, as well as in the liquefaction facility. As of December 31, 2022, the company's portfolio of assets included approximately 31.0 gigawatt of electric generating capacity; 10,600 miles of electric transmission lines; 78,500 miles of electric distribution lines; and 93,500 miles of gas distribution mains and related service facilities. The company was formerly known as Dominion Resources, Inc. Dominion Energy, Inc. was incorporated in 1983 and is headquartered in Richmond, Virginia.

Xcel Energy Inc., through its subsidiaries, generates, purchases, transmits, distributes, and sells electricity. It operates through Regulated Electric Utility, Regulated Natural Gas Utility, and All Other segments. The company generates electricity through coal, nuclear, natural gas, hydroelectric, solar, biomass, oil, wood/refuse, and wind energy sources. It also purchases, transports, distributes, and sells natural gas to retail customers, as well as transports customer-owned natural gas. In addition, the company develops and leases natural gas pipelines, and storage and compression facilities; and invests in rental housing projects, as well as procures equipment for the construction of renewable generation facilities. It serves residential, commercial, and industrial customers in the portions of Colorado, Michigan, Minnesota, New Mexico, North Dakota, South Dakota, Texas, and Wisconsin. The company was incorporated in 1909 and is headquartered in Minneapolis, Minnesota.

Exelon Corporation, a utility services holding company, engages in the energy distribution and transmission businesses in the United States and Canada. The company is involved in the purchase and regulated retail sale of electricity and natural gas, transmission and distribution of electricity, and distribution of natural gas to retail customers. It also offers support services, including legal, human resources, information technology, supply management, financial, engineering, customer operations, distribution and transmission planning, asset management, system operations, and power procurement services. It serves distribution utilities, municipalities, cooperatives, and financial institutions, as well as commercial, industrial, governmental, and residential customers. Exelon Corporation was incorporated in 1999 and is headquartered in Chicago, Illinois.

Vistra Corp., together with its subsidiaries, operates as an integrated retail electricity and power generation company. The company operates through six segments: Retail, Texas, East, West, Sunset, and Asset Closure. It retails electricity and natural gas to residential, commercial, and industrial customers across 20 states in the United States and the District of Columbia. In addition, the company is involved in the electricity generation, wholesale energy purchases and sales, commodity risk management, fuel production, and fuel logistics management activities. It serves approximately 3.5 million customers with a generation capacity of approximately 37,000 megawatts with a portfolio of natural gas, nuclear, coal, solar, and battery energy storage facilities. The company was formerly known as Vistra Energy Corp. and changed its name to Vistra Corp. in July 2020. Vistra Corp. was founded in 1882 and is based in Irving, Texas.

Consolidated Edison, Inc., through its subsidiaries, engages in the regulated electric, gas, and steam delivery businesses in the United States. It offers electric services to approximately 3.6 million customers in New York City and Westchester County; gas to approximately 1.1 million customers in Manhattan, the Bronx, parts of Queens, and Westchester County; and steam to approximately 1,530 customers in parts of Manhattan. The company also supplies electricity to approximately 0.3 million customers in southeastern New York and northern New Jersey; and gas to approximately 0.1 million customers in southeastern New York. In addition, it operates 543 circuit miles of transmission lines; 15 transmission substations; 63 distribution substations; 87,951 in-service line transformers; 3,869 pole miles of overhead distribution lines; and 2,320 miles of underground distribution lines, as well as 4,359 miles of mains and 377,741 service lines for natural gas distribution. Further, the company owns, develops, and operates renewable and energy infrastructure projects; and provides energy-related products and services to wholesale and retail customers, as well as invests in electric and gas transmission projects. It primarily sells electricity to industrial, commercial, residential, and government customers. Consolidated Edison, Inc. was founded in 1823 and is based in New York, New York.

Public Service Enterprise Group Incorporated, through its subsidiaries, operates as an energy company primarily in Mid-Atlantic United States. The company operates through PSE&G and PSEG Power. The PSE&G segment transmits electricity; distributes electricity and gas to residential, commercial, and industrial customers, as well as invests in solar generation projects, and energy efficiency and related programs; and offers appliance services and repairs. As of December 31, 2022, it had electric transmission and distribution system of 25,000 circuit miles and 864,000 poles; 55 switching stations with an installed capacity of 39,653 megavolt-amperes (MVA), and 235 substations with an installed capacity of 9,735 MVA; four electric distribution headquarters and five electric sub-headquarters; and 18,000 miles of gas mains, 12 gas distribution headquarters, two sub-headquarters, and one meter shop, as well as 56 natural gas metering and regulating stations. Public Service Enterprise Group Incorporated was incorporated in 1985 and is based in Newark, New Jersey.

PG&E Corporation, through its subsidiary, Pacific Gas and Electric Company, engages in the sale and delivery of electricity and natural gas to customers in northern and central California, the United States. It generates electricity using nuclear, hydroelectric, fossil fuel-fired, fuel cell, and photovoltaic sources. The company owns and operates interconnected transmission lines; electric transmission substations, distribution lines, transmission switching substations, and distribution substations; and natural gas transmission, storage, and distribution system consisting of distribution pipelines, backbone and local transmission pipelines, and various storage facilities. It serves residential, commercial, industrial, and agricultural customers, as well as natural gas-fired electric generation facilities. The company was incorporated in 1905 and is based in Oakland, California.

WEC Energy Group, Inc., through its subsidiaries, provides regulated natural gas and electricity, and renewable and nonregulated renewable energy services in the United States. The company operates through six segments: Wisconsin, Illinois, Other States, Electric Transmission, Non-Utility Energy Infrastructure, and Corporate and Other. It generates and distributes electricity from coal, natural gas, and oil, as well as hydroelectric, wind, solar, and biomass sources; provides electric transmission services; offers retail natural gas distribution services; transports natural gas; and generates, distributes, and sells steam. As of December 31, 2022, it operated approximately 35,600 miles of overhead distribution lines and 36,100 miles of underground distribution cables, as well as 430 electric distribution substations and 514,800 line transformers; 52,000 miles of natural gas distribution mains; 1,100 miles of natural gas transmission mains; 2.4 million natural gas lateral services; 500 natural gas distribution and transmission gate stations; and 68.2 billion cubic feet of working gas capacities in underground natural gas storage fields. The company was formerly known as Wisconsin Energy Corporation and changed its name to WEC Energy Group, Inc. in June 2015. WEC Energy Group, Inc. was founded in 1896 and is headquartered in Milwaukee, Wisconsin.

DTE Energy Company engages in the utility operations. The company's Electric segment generates, purchases, distributes, and sells electricity to approximately 2.3 million residential, commercial, and industrial customers in southeastern Michigan. It generates electricity through fossil-fuel, hydroelectric pumped storage, and nuclear plants, as well as wind and solar assets. This segment owns and operates approximately 697 distribution substations and approximately 451,900 line transformers. The company's Gas segment purchases, stores, transports, distributes, and sells natural gas to approximately 1.3 million residential, commercial, and industrial customers throughout Michigan; and sells storage and transportation capacity. This segment has approximately 21,000 miles of distribution mains; 1,352,000 service pipelines; and 1,316,000 active meters, as well as owns approximately 2,000 miles of transmission pipelines. Its DTE Vantage segment offers metallurgical and petroleum coke to steel and other industries; and power, steam and chilled water production, and wastewater treatment services, as well as supplies compressed air to industrial customers. Its Energy Trading segment engages in power, natural gas, and environmental marketing and trading; structured transactions; and the optimization of contracted natural gas pipeline transportation and storage positions. The company was founded in 1903 and is based in Detroit, Michigan.

Edison International, through its subsidiaries, generates and distributes electric power. The company supplies electricity to approximately 50,000 square mile area of southern California to residential, commercial, industrial, public authorities, agricultural, and other sectors. It also provides decarbonization and energy solutions to commercial, institutional, and industrial customers in North America and Europe. The company's transmission facilities consist of lines ranging from 55 kV to 500 kV and approximately 80 transmission substations; and distribution system consists of approximately 38,000 circuit-miles of overhead lines; approximately 31,000 circuit-miles of underground lines; and 730 substations. Edison International was founded in 1886 and is headquartered in Rosemead, California.

Ameren Corporation, together with its subsidiaries, operates as a public utility holding company in the United States. The company operates through four segments: Ameren Missouri, Ameren Illinois Electric Distribution, Ameren Illinois Natural Gas, and Ameren Transmission. It engages in the rate-regulated electric generation, transmission, and distribution activities; and rate-regulated natural gas distribution and transmission businesses. In addition, the company generates electricity through coal, nuclear, and natural gas, as well as renewable sources, such as hydroelectric, wind, methane gas, and solar. It serves residential, commercial, and industrial customers. The company was founded in 1881 and is headquartered in St. Louis, Missouri.

CenterPoint Energy, Inc. operates as a public utility holding company in the United States. The company operates through Electric and Natural Gas segments. The Electric segment includes electric transmission and distribution services to electric customers and electric generation assets, as well as optimizes assets in the wholesale power market. The Natural Gas segment engages in the intrastate natural gas sales, natural gas transportation and distribution for residential, commercial, industrial and institutional customers in Indiana, Louisiana, Minnesota, Mississippi, Ohio, and Texas; permanent pipeline connections through interconnects with various interstate and intrastate pipeline companies; and provision of home appliance maintenance and repair services to customers in Minnesota and home repair protection plans to natural gas customers in Indiana, Mississippi, Ohio, and Texas through a third party. As of December 31, 2022, it served approximately 2,534,730 metered customers; owned 349 substations with transformer capacity of 78,956 megavolt amperes; and owned and operated 217 miles of intrastate pipeline in Louisiana, Texas, and Oklahoma. The company was founded in 1866 and is headquartered in Houston, Texas.

NRG Energy, Inc., together with its subsidiaries, operates as an integrated power company in the United States. It operates through Texas, East, and West segments. The company is involved in producing and selling electricity and related products and services to approximately residential, commercial, industrial, and wholesale customers. It generates electricity using natural gas, coal, oil, solar, nuclear, and battery storage. The company also provides system power, distributed generation, renewable products, backup generation, storage and distributed solar, demand response, and energy efficiency and advisory services, as well as carbon management and specialty services. In addition, it trades in electric power, natural gas, and related commodities; environmental products; weather products; and financial products, including forwards, futures, options, and swaps. Further, the company procures fuels; and sells energy, services, and products and services under the NRG, Reliant, Direct Energy, Green Mountain Energy, Stream, and XOOM Energy. NRG Energy, Inc. was founded in 1989 and is headquartered in Houston, Texas.

FirstEnergy Corp., through its subsidiaries, generates, transmits, and distributes electricity in the United States. It operates through Regulated Distribution and Regulated Transmission segments. The company owns and operates coal-fired, nuclear, hydroelectric, wind, and solar power generating facilities. It operates 24,080 circuit miles of overhead and underground transmission lines; and electric distribution systems, including 274,518 miles of overhead pole line and underground conduit carrying primary, secondary, and street lighting circuits. The company serves approximately 6 million customers in Ohio, Pennsylvania, West Virginia, Maryland, New Jersey, and New York. FirstEnergy Corp. was incorporated in 1996 and is headquartered in Akron, Ohio.

PPL Corporation, a utility holding company, delivers electricity and natural gas in the United States and the United Kingdom. It operates through three segments: Kentucky Regulated, Pennsylvania Regulated, and Rhode Island Regulated. The company serves customers in Louisville and adjacent areas in Kentucky; electric customers in central, southeastern, and western Kentucky; and electric customers in five counties in southwestern Virginia. It also delivers electricity to customers in 29 counties within eastern and central Pennsylvania; and generates electricity from coal, gas, hydro, and solar sources in Kentucky; and sells wholesale electricity to two municipalities in Kentucky. The company was founded in 1920 and is headquartered in Allentown, Pennsylvania.

Eversource Energy, a public utility holding company, engages in the energy delivery business. The company operates through Electric Distribution, Electric Transmission, Natural Gas Distribution, and Water Distribution segments. It is involved in the transmission and distribution of electricity; solar power facilities; and distribution of natural gas. The company operates regulated water utilities that provide water services to approximately 237,000 customers. It serves residential, commercial, industrial, municipal and fire protection, and other customers in Connecticut, Massachusetts, and New Hampshire. The company was formerly known as Northeast Utilities and changed its name to Eversource Energy in April 2015. Eversource Energy is based in Springfield, Massachusetts.

CMS Energy Corporation operates as an energy company primarily in Michigan. The company operates through three segments: Electric Utility; Gas Utility; and Enterprises. The Electric Utility segment is involved in the generation, purchase, transmission, distribution, and sale of electricity. This segment generates electricity through coal, wind, gas, renewable energy, oil, and nuclear sources. Its distribution system comprises 208 miles of high-voltage distribution overhead lines; 4 miles of high-voltage distribution underground lines; 4,428 miles of high-voltage distribution overhead lines; 19 miles of high-voltage distribution underground lines; 82,474 miles of electric distribution overhead lines; 9,395 miles of underground distribution lines; 1,093 substations; and 3 battery facilities. The Gas Utility segment engages in the purchase, transmission, storage, distribution, and sale of natural gas, which includes 2,392 miles of transmission lines; 15 gas storage fields; 28,065 miles of distribution mains; and 8 compressor stations. The Enterprises segment is involved in the independent power production and marketing, including the development and operation of renewable generation. It serves 1.9 million electric and 1.8 million gas customers, including residential, commercial, and diversified industrial customers. The company was incorporated in 1987 and is headquartered in Jackson, Michigan.

NiSource Inc., an energy holding company, operates as a regulated natural gas and electric utility company in the United States. It operates through two segments, Gas Distribution Operations and Electric Operations. The company distributes natural gas to approximately 859,000 customers in northern Indiana, as well as approximately 2.4 million residential, commercial, and industrial customers in Ohio, Pennsylvania, Virginia, Kentucky, and Maryland. It operates approximately 54,800 miles of distribution main pipelines, as well as associated individual customer service lines; and 1,000 miles of transmission main pipelines. The company generates, transmits, and distributes electricity to approximately 486,000 customers in 20 counties in the northern part of Indiana, as well as engages in wholesale electric and transmission transactions. It owns and operates coal-fired electric generating stations with a capacity of 722 megawatts (MW) in Wheatfield and 455 MW in Michigan City; combined cycle gas turbine with a capacity of 563 MW in West Terre Haute; natural gas generating units with a capacity of 155 MW in Wheatfield; hydro generating plants with a capacity of 9 MW in Carroll County and 7 MW in White County; and wind generating units with a capacity of 102 MW and 302 MW in White County, Indiana. The company was formerly known as NIPSCO Industries, Inc. and changed its name to NiSource Inc. in April 1999. NiSource Inc. was founded in 1847 and is headquartered in Merrillville, Indiana.

Evergy, Inc., together with its subsidiaries, engages in the generation, transmission, distribution, and sale of electricity in Kansas and Missouri, the United States. The company generates electricity through coal, hydroelectric, landfill gas, uranium, and natural gas and oil sources, as well as solar, wind, other renewable sources. It serves residences, commercial firms, industrials, municipalities, and other electric utilities. The company was incorporated in 2017 and is headquartered in Kansas City, Missouri.

Alliant Energy Corporation operates as a utility holding company that provides regulated electricity and natural gas services. It operates through three segments: Utility Electric Operations, Utility Gas Operations, and Utility Other. The company, through its subsidiary, Interstate Power and Light Company (IPL), primarily generates and distributes electricity, and distributes and transports natural gas to retail customers in Iowa; sells electricity to wholesale customers in Minnesota, Illinois, and Iowa; and generates and distributes steam in Cedar Rapids, Iowa. Alliant Energy Corporation, through its other subsidiary, Wisconsin Power and Light Company (WPL), generates and distributes electricity, and distributes and transports natural gas to retail customers in Wisconsin; and sells electricity to wholesale customers in Wisconsin. It serves retail customers in the farming, agriculture, industrial manufacturing, chemical, and packaging and food industries. In addition, the company owns and operates a short-line rail freight service in Iowa; a barge, rail, and truck freight terminal on the Mississippi River; and a rail-served warehouse in Iowa, as well as offers freight brokerage services. Further, it holds interests in a natural gas-fired electric generating unit near Sheboygan Falls, Wisconsin; and a wind farm located in Oklahoma. Alliant Energy Corporation was incorporated in 1981 and is headquartered in Madison, Wisconsin.

Pinnacle West Capital Corporation, through its subsidiary, Arizona Public Service Company, provides retail and wholesale electric services primarily in the state of Arizona. The company engages in the generation, transmission, and distribution of electricity using coal, nuclear, gas, oil, and solar generating facilities. Its transmission facilities include overhead lines and underground lines; and distribution facilities, as well as owns and maintains transmission and distribution substations. The company was incorporated in 1985 and is headquartered in Phoenix, Arizona.