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EDP - Energias de Portugal, S.A. engages in the generation, transmission, distribution, and supply of electricity in Portugal, Spain, France, Poland, Romania, Italy, Belgium, the United Kingdom, Greece, Colombia, Brazil, North America, and internationally. It operates through Renewables, Networks, and Client Solutions & Energy Management segments. The company primarily generates and sells electricity through hydro, CCGT, coal, wind, solar, nuclear, and cogeneration and waste sources. It has an installed capacity of 28 GW; and operates 380,788 kilometers of distribution network lines. The company is also involved in the supply of natural gas. In addition, it offers engineering, laboratory tests, professional training, and energy services, as well as property management services. The company's electricity and gas customers include domestic, industrial, commercial, agricultural, and others. The company was incorporated in 1976 and is headquartered in Lisbon, Portugal.

Entergy Corporation, together with its subsidiaries, engages in the production and retail distribution of electricity in the United States. It 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. It also engages in the ownership of interests in non-nuclear power plants that sell electric power to wholesale customers, as well as provides decommissioning 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 of electric generating capacity. 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.

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.

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 447,000 retail customers in southeastern Arizona; and 103,000 retail customers in Arizona's Mohave and Santa Cruz counties with an aggregate capacity of 3,408 megawatts (MW), including 68 MW of solar capacity and 250 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 1,087,000 residential, commercial, and industrial customers in British Columbia, Canada. In addition, it owns and operates the electricity distribution system that serves approximately 592,000 customers in southern and central Alberta; owns four 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 145 MW; and on Prince Edward Island with a generating capacity of 90 MW. Additionally, it provides integrated electric utility service to approximately 69,000 customers in Ontario; approximately 275,000 customers in Newfoundland and Labrador; approximately 34,000 customers on Grand Cayman, Cayman Islands; and approximately 17,000 customers on certain islands in Turks and Caicos. It 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 90,500 circuit Kilometers (km) of distribution lines; and approximately 51,600 km of natural gas pipelines. Fortis Inc. was founded in 1885 and is headquartered in St. John's, Canada.

SSE plc engages in the generation, transmission, distribution, and supply of electricity. It generates electricity from water, gas, coal, oil, and multi fuel. The company distributes electricity to approximately 3.8 million homes and businesses across the north of the central belt of Scotland and central southern England; and owns, operates, and develops high voltage electricity transmission system in the north of Scotland and remote islands. It also produces, stores, distributes, and supplies gas. In addition, it engages in the electricity and utility contracting, telecommunications, energy trading, insurance, and property holding businesses, as well as provides maintenance services. The company was formerly known as Scottish and Southern Energy plc and changed its name to SSE plc in September 2011. SSE plc was incorporated in 1989 and is based in Perth, the United Kingdom.