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, 2021, the company had approximately 28,564 megawatts of net generating capacity; approximately 77,000 circuit miles of transmission and distribution lines; and 696 substations. It serves approximately 11 million people through approximately 5.7 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. The company 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 Gas Distribution Operations, Gas Pipeline Investments, Wholesale Gas Services, and Gas Marketing Services segments. 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, wholesale gas services, and gas pipeline investments operations. In addition, it owns and/or operates 30 hydroelectric generating stations, 24 fossil fuel generating stations, three nuclear generating stations, 13 combined cycle/cogeneration stations, 45 solar facilities, 15 wind facilities, one fuel cell facility, and four battery storage facility; and constructs, operates, and maintains 76,289 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. The company serves approximately 8.7 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 three segments: Electric Utilities and Infrastructure, Gas Utilities and Infrastructure, and Commercial Renewables. The Electric Utilities and Infrastructure segment generates, transmits, distributes, and sells electricity in the Carolinas, Florida, and the Midwest; and uses coal, hydroelectric, natural gas, oil, renewable generation, and nuclear fuel to generate electricity. It also engages in the wholesale of electricity to municipalities, electric cooperative utilities, and load-serving entities. This segment serves approximately 8.2 million customers in 6 states in the Southeast and Midwest regions of the United States covering a service territory of approximately 91,000 square miles; and owns approximately 50,259 megawatts (MW) of generation capacity. The Gas Utilities and Infrastructure segment distributes natural gas to residential, commercial, industrial, and power generation natural gas customers; and owns, operates, and invests in pipeline transmission and natural gas storage facilities. It has approximately 1.6 million customers, including 1.1 million customers in North Carolina, South Carolina, and Tennessee, as well as 550,000 customers in southwestern Ohio and northern Kentucky. The Commercial Renewables segment acquires, owns, develops, builds, and operates wind and solar renewable generation projects, including nonregulated renewable energy and energy storage services to utilities, electric cooperatives, municipalities, and corporate customers. It has 23 wind, 178 solar, and 2 battery storage facilities, as well as 71 fuel cell locations with a capacity of 3,554 MW across 22 states. The company was formerly known as Duke Energy Holding Corp. and changed its name to Duke Energy Corporation in April 2005. The company was founded in 1904 and is headquartered in Charlotte, North Carolina.

National Grid plc transmits and distributes electricity and gas. The company operates through UK Electricity Transmission, UK Electricity Distribution, UK Electricity System Operator, New England, and New York segments. The UK Electricity Transmission segment provides electricity transmission and construction work services in England and Wales. The UK Electricity Distribution segment offers electricity distribution services in Midlands, and South West of England and South Wales. The UK Electricity System Operator segment provides balancing services for supply and demand of electricity on Great Britain's electricity transmission system; and acts as an agent on behalf of transmission operators. The New England segment offers electricity and gas distribution, and electricity transmission services in New England. The New York segment provides electricity and gas distribution, and electricity transmission services in New York. It also engages in the provision of transmission services through electricity interconnectors and LNG importation at the Isle of Grain; sale of renewables projects; and leasing and sale of commercial property, as well as insurance activities in the United Kingdom. The company was founded in 1990 and is headquartered in London, the United Kingdom.

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, 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. American Electric Power Company, Inc. was incorporated in 1906 and is headquartered in Columbus, Ohio.

Dominion Energy, Inc. produces and distributes energy in the United States. The company 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, West Virginia, North Carolina, Utah, southwestern Wyoming, and southeastern Idaho that serve approximately 3.1 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 772,000 customers in the central, southern, and southwestern portions of South Carolina; and distributes natural gas to approximately 419,000 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, 2021, the company's portfolio of assets included approximately 30.2 gigawatt of electric generating capacity; 10,700 miles of electric transmission lines; 78,000 miles of electric distribution lines; and 95,700 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.

Exelon Corporation, a utility services holding company, engages in the energy generation, delivery, and marketing businesses in the United States and Canada. It owns nuclear, fossil, wind, hydroelectric, biomass, and solar generating facilities. The company also sells electricity to wholesale and retail customers; and sells natural gas, renewable energy, and other energy-related products and services. Additionally, it is involved in the purchase and regulated retail sale of electricity and natural gas; and transmission and distribution of electricity, and distribution of natural gas to retail customers. Further, the company offers support services, including legal, human resources, information technology, financial, supply management, accounting, 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.

Public Service Enterprise Group Incorporated, through its subsidiaries, operates as an energy company primarily in the Northeastern and Mid-Atlantic United States. It operates through two segments, 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, 2021, it had electric transmission and distribution system of 25,000 circuit miles and 862,000 poles; 56 switching stations with an installed capacity of 39,353 megavolt-amperes (MVA), and 235 substations with an installed capacity of 9,285 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 58 natural gas metering and regulating stations. Public Service Enterprise Group Incorporated was incorporated in 1985 and is based in Newark, New Jersey.

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 sells electricity to approximately 3.7 million customers; and natural gas to approximately 2.1 million customers. Xcel Energy Inc. was incorporated in 1909 and is headquartered in Minneapolis, Minnesota.

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 3.5 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 1,555 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 533 circuit miles of transmission lines; 15 transmission substations; 64 distribution substations; 87,564 in-service line transformers; 3,924 pole miles of overhead distribution lines; and 2,291 miles of underground distribution lines, as well as 4,350 miles of mains and 377,971 service lines for natural gas distribution. Further, the company owns, operates, and develops 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. The company was founded in 1823 and is based in New York, New York.

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. As of December 31, 2021, the company owns and operates approximately 18,000 circuit miles of interconnected transmission lines; 33 electric transmission substations, approximately 108,000 circuit miles of distribution lines, 67 transmission switching substations, and 753 distribution substations; and natural gas transmission, storage, and distribution system consisting of approximately 43,800 miles of distribution pipelines, approximately 6,200 miles of 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 headquartered in San Francisco, California.

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 26,000 megawatts (MW) of electric generating capacity, which include 6,000 MW of nuclear power. It delivers electricity to 3 million utility customers in Arkansas, Louisiana, Mississippi, and Texas. The company was founded in 1913 and is headquartered in New Orleans, Louisiana.

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, oil, 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, 2021, it operated approximately 35,800 miles of overhead distribution lines and 35,600 miles of underground distribution cables, as well as 440 electric distribution substations and 510,500 line transformers; 50,900 miles of natural gas distribution mains; 1,200 miles of natural gas transmission mains; 2.3 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 incorporated in 1981 and is headquartered in Milwaukee, Wisconsin.

Fortis Inc. operates as an electric and gas utility company in Canada, the United States, and the Caribbean countries. It generates, transmits, and distributes electricity to approximately 438,000 retail customers in southeastern Arizona; and 100,000 retail customers in Arizona's Mohave and Santa Cruz counties with an aggregate capacity of 3,485 megawatts (MW), including 53 MW of solar capacity and 252 MV of wind capacity. The company also sells wholesale electricity to other entities in the western United States; owns gas-fired and hydroelectric generating capacity totaling 65 MW; and distributes natural gas to approximately 1,065,000 residential, commercial, and industrial customers in British Columbia, Canada. In addition, it owns and operates the electricity distribution system that serves approximately 577,000 customers in southern and central Alberta; owns 4 hydroelectric generating facilities with a combined capacity of 225 MW; and provides operation, maintenance, and management services to five hydroelectric generating facilities. Further, the company distributes electricity in the island portion of Newfoundland and Labrador with an installed generating capacity of 143 MW; and on Prince Edward Island with a generating capacity of 130 MW. Additionally, it provides integrated electric utility service to approximately 68,000 customers in Ontario; approximately 272,000 customers in Newfoundland and Labrador; approximately 32,000 customers on Grand Cayman, Cayman Islands; and approximately 16,000 customers on certain islands in Turks and Caicos. The company also holds long-term contracted generation assets in Belize consisting of 3 hydroelectric generating facilities with a combined capacity of 51 MW; and the Aitken Creek natural gas storage facility. It also owns and operates approximately 90,200 circuit Kilometers (km) of distribution lines; and approximately 50,500 km of natural gas pipelines. Fortis Inc. was founded in 1885 and is headquartered in St. John's, Canada.

Hydro One Limited, through its subsidiaries, operates as an electricity transmission and distribution company in Ontario. It operates through three segments: Transmission Business, Distribution Business, and Other. The company owns and operates approximately 30,000 circuit kilometers of high-voltage transmission lines and 125,000 circuit kilometers of primary low-voltage distribution network. It serves approximately 1.5 million residential, small business, commercial, and industrial customers. The company also provides telecommunications support services for its transmission and distribution businesses; and information and communications technology services and solutions. Hydro One Limited was incorporated in 2015 and is headquartered in Toronto, Canada.

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 other renewable assets. This segment owns and operates approximately 698 distribution substations and 449,800 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 20,000 miles of distribution mains; 1,304,000 service pipelines; and 1,305,000 active meters, as well as owns approximately 2,000 miles of transmission pipelines. The company's Power and Industrial Projects segment offers metallurgical coke; pulverized coal and petroleum coke to the steel, pulp and paper, 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 headquartered in Detroit, Michigan.

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

PPL Corporation, a utility holding company, delivers electricity and natural gas in the United States and the United Kingdom. The company operates through two segments: Kentucky Regulated and Pennsylvania Regulated. It serves approximately 429,000 electric and 333,000 natural gas customers in Louisville and adjacent areas in Kentucky; 538,000 electric customers in central, southeastern, and western Kentucky; and 28,000 electric customers in five counties in southwestern Virginia. The company also provides electric services to approximately 1.4 million customers in Pennsylvania; and generates electricity from coal, gas, hydro, and solar sources in Kentucky; and sells wholesale electricity to two municipalities in Kentucky. PPL Corporation was founded in 1920 and is headquartered in Allentown, Pennsylvania.

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 assets in the wholesale power market. The Natural Gas segment provides natural gas distribution services, as well as home appliance maintenance and repair services to customers in Minnesota; and home repair protection plans to natural gas customers in Arkansas, Indiana, Mississippi, Ohio, Oklahoma, and Texas and Louisiana through a third party. This segment also engages in the sale of regulated intrastate natural gas, and transportation and storage of natural gas for residential, commercial, industrial, and transportation customers. As of December 31, 2021, it served approximately 2.7 million metered customers; owned 239 substation sites with a total installed rated transformer capacity of 71,241 megavolt amperes; operated approximately 1,00,000 linear miles of natural gas distribution and transmission mains; and owned and operated 285 miles of intrastate pipeline in Louisiana, Texas, and Oklahoma. The company was founded in 1866 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, natural gas, wind, and solar power generating facilities. It operates 24,074 circuit miles of overhead and underground transmission lines; and electric distribution systems, including 273,295 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.

Edison International, through its subsidiaries, generates and distributes electric power. It delivers electricity to 15 million residential, commercial, industrial, public authorities, agricultural, and other customers across Southern, Central, and Coastal California. The company also provides energy solutions to commercial and industrial users. Its transmission facilities consist of lines ranging from 55 kV to 500 kV and substations; and distribution system consists of approximately 39,000 circuit-miles of overhead lines, approximately 31,000 circuit-miles of underground lines, and 800 substations. The company was founded in 1886 and is headquartered in Rosemead, California.

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 226,000 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.

Fortis Inc. operates as an electric and gas utility company in Canada, the United States, and the Caribbean countries. It generates, transmits, and distributes electricity to approximately 438,000 retail customers in southeastern Arizona; and 100,000 retail customers in Arizona's Mohave and Santa Cruz counties with an aggregate capacity of 3,485 megawatts (MW), including 53 MW of solar capacity and 252 MV of wind capacity. The company also sells wholesale electricity to other entities in the western United States; owns gas-fired and hydroelectric generating capacity totaling 65 MW; and distributes natural gas to approximately 1,065,000 residential, commercial, and industrial customers in British Columbia, Canada. In addition, it owns and operates the electricity distribution system that serves approximately 577,000 customers in southern and central Alberta; owns 4 hydroelectric generating facilities with a combined capacity of 225 MW; and provides operation, maintenance, and management services to five hydroelectric generating facilities. Further, the company distributes electricity in the island portion of Newfoundland and Labrador with an installed generating capacity of 143 MW; and on Prince Edward Island with a generating capacity of 130 MW. Additionally, it provides integrated electric utility service to approximately 68,000 customers in Ontario; approximately 272,000 customers in Newfoundland and Labrador; approximately 32,000 customers on Grand Cayman, Cayman Islands; and approximately 16,000 customers on certain islands in Turks and Caicos. The company also holds long-term contracted generation assets in Belize consisting of 3 hydroelectric generating facilities with a combined capacity of 51 MW; and the Aitken Creek natural gas storage facility. It also owns and operates approximately 90,200 circuit Kilometers (km) of distribution lines; and approximately 50,500 km of natural gas pipelines. Fortis Inc. was founded in 1885 and is headquartered in St. John's, Canada.

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.

Emera Incorporated, an energy and services company, through its subsidiaries, engages in the generation, transmission, and distribution of electricity to various customers. The company operates through Florida Electric Utility, Canadian Electric Utilities, Other Electric Utilities, Gas Utilities and Infrastructure, and Other segments. It generates electricity through coal-fired, natural gas and/or oil, hydro, wind, solar, petroleum coke, and biomass-fueled power plants. The company is also involved in the purchase, transmission, distribution, and sale of natural gas; and the provision of energy marketing, trading, and other energy asset management services. In addition, it transports re-gasified liquefied natural gas from Saint John, New Brunswick to consumers in the northeastern United States through its 145-kilometer pipeline. As of December 31, 2021, the company's electric utilities served approximately 810,600 customers in West Central Florida; 536,000 customers in Nova Scotia; 132,000 customers in the island of Barbados; 19,000 customers in the Grand Bahama Island; and 35,700 customers in the island of Dominica, as well as gas utilities and infrastructure served approximately 445,000 customers across Florida and 542,000 customers in New Mexico. It also provides insurance and reinsurance services to Emera and its affiliates, as well as offers financing services. The company was incorporated in 1998 and is headquartered in Halifax, Canada.

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. As of December 31, 2021, IPL supplied electric and natural gas service to approximately 500,000 and 225,000 retail customers respectively; and WPL supplied electric and natural gas service to approximately 485,000 and 200,000 retail customers, respectively. 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 347 megawatt (MW) natural gas-fired electric generating unit near Sheboygan Falls, Wisconsin; and a 225 MW wind farm located in Oklahoma. The company was incorporated in 1981 and is headquartered in Madison, Wisconsin.

Centrais Elétricas Brasileiras S.A. - Eletrobras, through its subsidiaries, engages in the generation, transmission, and distribution of electricity in Brazil. The company generates electricity through hydroelectric, thermal, nuclear, wind, and solar plants. As of December 31, 2021, it owned and operated 32 hydroelectric plants with a total installed capacity of 46,295.75 megawatts; nine thermal plants, including coal, and oil and gas power generation units with a total installed capacity of 1,505 megawatts; and two nuclear power plants comprising Angra I with an installed capacity of 640 megawatts and Angra II with an installed capacity of 1,350 megawatts. It also operates 66,556 kilometers of transmission lines. The company was incorporated in 1962 and is based in Rio de Janeiro, Brazil.

Evergy, Inc., together with its subsidiaries, engages in the generation, transmission, distribution, and sale of electricity in Kansas and Missouri, the United States. It generates electricity through coal, hydroelectric, landfill gas, uranium, and natural gas and oil sources, as well as solar, wind, other renewable sources. The company has approximately 10,100 circuit miles of transmission lines; 39,800 circuit miles of overhead distribution lines; and 13,000 circuit miles of underground distribution lines. It serves approximately 1,620,400 customers, including residences, commercial firms, industrials, municipalities, and other electric utilities. Evergy, Inc. was incorporated in 2017 and is headquartered in Kansas City, Missouri.

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 approximately 5,814 pole miles of overhead lines and approximately 74 miles of underground lines; and distribution facilities comprise approximately 11,258 miles of overhead lines and approximately 22,821 miles of underground primary cable, as well as owns and maintains 475 transmission and distribution substations. The company also owns or leases approximately 6,323 megawatts of regulated generation capacity. It serves approximately 1.3 million customers. Pinnacle West Capital Corporation was incorporated in 1985 and is headquartered in Phoenix, Arizona.

Korea Electric Power Corporation, an integrated electric utility company, generates, transmits, and distributes electricity in South Korea and internationally. The company operates through Transmission and Distribution, Nuclear Power Generation, Thermal Power Generation, and Others segments. It generates power from nuclear, coal, oil, liquefied natural gas, internal combustion, combined-cycle, integrated gasification combined cycle, hydro, wind, solar, fuel cell, biogas, and other sources. As of December 31, 2021, the company had a total of 763 generation units, including nuclear, thermal, hydroelectric, and internal combustion units with an installed generation capacity of 82,459 megawatts. Its transmission system consisted of 34,923 circuit kilometers of lines of 765 kilovolts and others, including high-voltage direct current lines, as well as 892 substations with an installed transformer capacity of 344,286 megavolt-amperes; and distribution system included 132,376 megavolt-amperes of transformer capacity and 9,940,440 units of support with a total line length of 532,348 circuit kilometers. The company provides electricity to residential, commercial, educational, industrial, agricultural, street lighting, and overnight power usage. It also offers utility plant maintenance, resources development, electric power information technology, facility maintenance and service, electric meter reading, security, information, and communication line leasing services, as well as sells nuclear fuel. Korea Electric Power Corporation was founded in 1961 and is headquartered in Naju-si, South Korea.

OGE Energy Corp., together with its subsidiaries, operates as an energy and energy services provider that offers physical delivery and related services for electricity, natural gas, crude oil, and natural gas liquids in the United States. The company generates, transmits, distributes, and sells electric energy. It provides retail electric service to approximately 879,000 customers, which covers a service area of approximately 30,000 square miles in Oklahoma and western Arkansas; and owns and operates coal-fired, natural gas-fired, wind-powered, and solar-powered generating assets. As of December 31, 2021, the company owned and operated interconnected electric generation, transmission, and distribution systems, including 16 generating stations with an aggregate capability of 7,207 megawatts; and transmission systems comprising 54 substations and 5,122 structure miles of lines in Oklahoma, and 7 substations and 277 structure miles of lines in Arkansas. Its distribution systems included 350 substations; 29,494 structure miles of overhead lines; 3,365 miles of underground conduit; and 11,125 miles of underground conductors in Oklahoma, as well as 29 substations, 2,795 structure miles of overhead lines, 349 miles of underground conduit, and 662 miles of underground conductors in Arkansas. The company was founded in 1902 and is based in Oklahoma City, Oklahoma.

IDACORP, Inc., together with its subsidiaries, engages in the generation, transmission, distribution, purchase, and sale of electric energy in the United States. The company operates 17 hydropower generating plants located in southern Idaho and eastern Oregon; three natural gas-fired plants in southern Idaho; and interests in two coal-fired steam electric generating plants located in Wyoming and Nevada. As of December 31, 2021, it had approximately 4,843 pole-miles of high-voltage transmission lines; 23 step-up transmission substations located at power plants; 21 transmission substations; 10 switching stations; 30 mixed-use transmission and distribution substations; 187 energized distribution substations; and 28,570 pole-miles of distribution lines, as well as provides electric utility services to approximately 604,000 retail customers in southern Idaho and eastern Oregon. The company serves commercial and industrial customers, which involved in food processing, electronics and general manufacturing, agriculture, health care, government, and education. It also invests in housing and other real estate tax credit investments. IDACORP, Inc. was founded in 1915 and is headquartered in Boise, Idaho.

TXNM Energy, Inc., through its subsidiaries, provides electricity and electric services in the United States. It operates through Public Service Company of New Mexico (PNM) and Texas-New Mexico Power Company (TNMP) segments. The PNM segment engages in the generation, transmission, and distribution of electricity. The segment owns and leases communications, office and other equipment, office space, vehicles, and real estate. It generates electricity using coal, natural gas and oil, and nuclear fuel and waste, as well as solar, wind, geothermal, and battery storage energy sources. The TNMP segment provides regulated transmission and distribution services. The segment also owns and leases vehicles, service facilities, and office locations throughout its service territory. The company serves residential, commercial, and industrial customers and end-users of electricity in New Mexico and Texas. The company was formerly known as PNM Resources, Inc and changed its name to TXNM Energy, Inc. in August 2024. TXNM Energy, Inc. was founded in 1882 and is based in Albuquerque, New Mexico.

Portland General Electric Company, an integrated electric utility company, engages in the generation, wholesale purchase, transmission, distribution, and retail sale of electricity in the state of Oregon. It operates six thermal plants, three wind farms, and seven hydroelectric facilities. As of December 31, 2021, the company owned an electric transmission system consisting of 1,274 circuit miles, including 287 circuit miles of 500 kilovolt line, 415 circuit miles of 230 kilovolt line, and 572 miles of 115 kilovolt line. It has 28,206 circuit miles of distribution lines. The company also purchases and sells wholesale natural gas in the United States and Canada. It serves approximately 917 thousand residential, commercial, and industrial customers in 51 cities. The company was founded in 1889 and is headquartered in Portland, Oregon.

Enel Chile S.A., an electricity utility company, engages in the generation, transmission, and distribution of electricity in Chile. The company operates through Generation Business and Distribution Business segments. It generates electricity through various sources, such as hydroelectric, thermal, wind, solar, and geothermal power plants. As of December 31, 2021, it had 8,054 megawatts of gross installed capacity, as well as distributed electricity to approximately 2.0 million customers with 2,105 square kilometers of transmission lines in 33 municipalities of the Santiago metropolitan region. The company also engages in the sale and transportation of natural gas; and provision of construction works, engineering, and consulting services. It serves residential, commercial, industrial, governmental, and other customers. The company was formerly known as Enersis Chile S.A. and changed its name to Enel Chile S.A. in October 2016. The company was incorporated in 2016 and is headquartered in Santiago, Chile. Enel Chile S.A. is a subsidiary of Enel S.p.A.

Oklo Inc. designs and develops fission power plants to provide reliable and commercial-scale energy to customers in the United States. It also provides used nuclear fuel recycling services. The company was founded in 2013 and is based in Santa Clara, California.

Central Puerto S.A. generates and sells electric power to private and public customers in Argentina. It also produces steam. As of December 31, 2021, the company owned and operated five thermal generation plants, one hydroelectric generation plant, and seven wind farms with a total installed capacity of 4,809 MW. Central Puerto S.A. was founded in 1898 and is based in Buenos Aires, Argentina.