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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.

Hawaiian Electric Industries, Inc., together with its subsidiaries, engages in the electric utility businesses in the United States. It operates in three segments: Electric Utility, Bank, and Other. The Electric Utility segment engages in the production, purchase, transmission, distribution, and sale of electricity in the islands of Oahu, Hawaii, Maui, Lanai, and Molokai. Its renewable energy sources and potential sources include wind, solar, photovoltaic, geothermal, wave, hydroelectric, municipal waste, and other biofuels. This segment serves suburban communities, resorts, the United States Armed Forces installations, and agricultural operations. The Bank segment operates a federally chartered savings bank that offers banking and other financial services to consumers and businesses, including savings and checking accounts; and loans comprising residential and commercial real estate, residential mortgage, construction and development, multifamily residential and commercial real estate, consumer, and commercial loans. The Other segment invests in non-regulated renewable energy and sustainable infrastructure in the State of Hawaii. Hawaiian Electric Industries, Inc. was founded in 1891 and is headquartered in Honolulu, Hawaii.

Ormat Technologies, Inc. engages in the geothermal and recovered energy power business in the United States, Indonesia, Kenya, Turkey, Chile, Guatemala, Guadeloupe, New Zealand, Honduras, and internationally. It operates in three segments: Electricity, Product, and Energy Storage. The Electricity segment develops, builds, owns, and operates geothermal, solar photovoltaic, and recovered energy-based power plants; and sells electricity. The Product segment designs, manufactures, and sells equipment for geothermal and recovered energy-based electricity generation; and provides services relating to the engineering, procurement, construction, operation, and maintenance of geothermal and recovered energy-based power plants. This segment serves contractors; and owners and operators of interstate natural gas pipelines, gas processing plants, and cement plants, as well as companies in other energy-intensive industrial processes. The Energy Storage segment offers battery energy storage systems and related services. Ormat Technologies, Inc. was founded in 1965 and is headquartered in Reno, Nevada.

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.