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DTE Energy Company engages in the utility operations. The company's Electric segment generates, purchases, distributes, and sells electricity to various residential, commercial, and industrial customers in southeastern Michigan. It generates electricity through coal-fired plants, hydroelectric pumped storage, and nuclear plants, as well as wind and solar assets. This segment owns and operates distribution substations and line transformers. The company's Gas segment purchases, stores, transports, distributes, and sells natural gas to various residential, commercial, and industrial customers throughout Michigan; and sells storage and transportation capacity. Its DTE Vantage segment offers metallurgical and petroleum coke to steel and other industries; and power generation, steam production, chilled water production, and wastewater treatment services, as well as air 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 1849 and is based in Detroit, Michigan.

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.

Edison International, through its subsidiaries, engages in the generation and distribution of electric power. The company supplies and delivers electricity to approximately 50,000 square mile area of southern California to residential, commercial, industrial, public authorities, agricultural, and other sectors. Its transmission facilities consist of lines ranging from 55 kV to 500 kV and approximately 80 transmission substations; distribution system consists of approximately 38,000 circuit-miles of overhead lines; approximately 31,000 circuit-miles of underground lines; and 730 distribution substations. The company was founded in 1886 and is based in Rosemead, California.

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.

PPL Corporation, an energy company, focuses on providing electricity and natural gas to approximately 3.6 million customers in the United States. It operates through three segments: Kentucky Regulated, Pennsylvania Regulated, and Rhode Island Regulated. The company delivers electricity to customers in Pennsylvania, Kentucky, Virginia, and Rhode Island; delivers natural gas to customers in Kentucky and Rhode Island; and generates electricity from power plants in Kentucky. PPL Corporation was founded in 1920 and is headquartered in Allentown, Pennsylvania.