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Black Hills Corporation, through its subsidiaries, operates as an electric and natural gas utility company in the United States. The company operates in two segments: Electric Utilities and Gas Utilities. The Electric Utilities segment generates, transmits, and distributes electricity to approximately 222,000 electric utility customers in Colorado, Montana, South Dakota, and Wyoming; and owns and operates 1,394 megawatts of generation capacity and 9,106 miles of electric transmission and distribution lines. The Gas Utilities segment distributes natural gas to approximately 1,116,000 natural gas utility customers in Arkansas, Colorado, Iowa, Kansas, Nebraska, and Wyoming; owns and operates 4,663 miles of intrastate gas transmission pipelines; 42,514 miles of gas distribution mains and service lines; seven natural gas storage sites; and approximately 50,000 horsepower of compression and 516 miles of gathering lines. It also constructs and maintains customer owned gas infrastructure facilities for gas transportation customers; and provides appliance repair services to residential utility customers, as well as electrical system construction services to large industrial customers. In addition, the company produces electric power through wind, natural gas, and coal-fired generating plants; and coal at its coal mine located near Gillette, Wyoming. Black Hills Corporation was incorporated in 1941 and is headquartered in Rapid City, South Dakota.

Companhia Energética de Minas Gerais, through its subsidiaries, engages in the generation, transmission, distribution, and sale of electricity in Brazil. The company generates electricity through renewable energy sources, such as water, wind, sun, and biomass; or non-renewable sources, including fossil and nuclear fuels. As of December 31, 2016, it operated hydroelectric plants, thermoelectric plants, and solar plants with a total installed capacity of approximately 8,000 megawatts in 10 states of Brazil. It is also involved in the telecommunications and energy solutions consulting businesses; exploitation of natural gas; sale and trading of electricity; and acquisition, transport, and distribution of gas and its subproducts and derivatives, as well as provision of technology systems and systems for operational management of public service concessions, including companies operating in electricity, gas, water and sewerage, and other utility companies. The company was founded in 1952 and is headquartered in Belo Horizonte, Brazil.

Centrica plc operates as an integrated energy company in the United Kingdom, Ireland, Scandinavia, North America, and internationally. The company operates through British Gas Services & Solutions, British Gas Energy, Centrica Business Solutions, Bord Gáis Energy, Centrica Energy, and Upstream segments. It supplies gas and electricity to residential, commercial, industrial customers, and small businesses, as well as offers energy-related services; and generates power from nuclear assets. The company also provides installation, repair, and maintenance services for central heating, ventilation, and air conditioning systems, as well as offers breakdown services. In addition, it is involved in the procurement, trading, and optimization of energy; procurement and sale of LNG; development and operation of large-scale power assets; building of solar farm and connecting to grid; and supply of energy efficiency solutions and technologies. Further, the company produces and processes gas and oil; constructs, owns, and exploits infrastructure; offers central heating, boiler and controls, plumbing and drains, and electrical appliance insurance covers; and engages in the social enterprise investment fund activities. Additionally, it provides metering assets and services, vehicle leasing, and energy management products and services; constructs battery storage and gas peakers; and operates a gas storage and franchise network. The company was formerly known as Yieldtop plc and changed its name to Centrica plc in December 1996. Centrica plc was founded in 1812 and is based in Windsor, the United Kingdom.

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, 2023, it had approximately 4,762 pole-miles of high-voltage transmission lines; 23 step-up transmission substations located at power plants; 21 transmission substations; 11 switching stations; 30 mixed-use transmission and distribution substations; 186 energized distribution substations; and 29,714 pole-miles of distribution lines, and 131 MW of battery storage, as well as provides electric utility services to approximately 633,000 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.

PNM Resources, 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. PNM Resources, Inc. was founded in 1882 and is based in Albuquerque, New Mexico.