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

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.

Veolia Environnement SA designs and provides water, waste, and energy management solutions worldwide. It operates through France and Special Waste Europe; Europe excluding France; Rest of the World; Water Technologies; and Other segments. The company is involved in resource management; customer relationship management; drinking water treatment and distribution; wastewater treatment; design and construction of treatment and network infrastructure; and sale of water treatment equipment, technologies, and facilities. It provides waste collection, product recovery and waste-to-energy processing, including sale of recycled products; dismantling and remediation; hazardous waste processing; urban cleaning; and industrial maintenance and cleaning services. In addition, the company engages in the operation and maintenance of heating and cooling networks; optimization of industrial utilities, such as steam generation, cooling, electricity, compressed air; installation and maintenance of production equipment; development of energy services to reduce energy consumption and CO2 emissions of buildings; integrated services for building management, and the production of electricity from biomass, as well as provides thermal and multi-technical services. It serves industrial and service sector companies, public authorities, and individuals. The company was formerly known as Vivendi Environnement and changed its name to Veolia Environnement SA in January 2003. Veolia Environnement SA was founded in 1853 and is headquartered in Paris, France.