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Algonquin Power & Utilities Corp. operates in the power and utility industries in the United States, Canada, and other regions. The company operates in two segments, Regulated Services Group and Renewable Energy Group. The company primarily owns and operates a regulated electric, water distribution and wastewater collection, and natural gas utility systems and transmission operations. As of December 31, 2023, it provided distribution services to approximately 1,256,000 customer connections in the electric (approximately 309,000 customer connections), water and wastewater (approximately 572,000 customer connections), and natural gas sectors (approximately 375,000 customer connections). The company's electrical distribution utility systems and related transmission and generation assets are located in the states of Arkansas, California, Kansas, Missouri, Nevada, New Hampshire, and Oklahoma, and in Bermuda. Its regulated water distribution and wastewater collection utility systems are located in the states of Arizona, Arkansas, California, Illinois, Missouri, New York and Texas, and in Chile. The company's regulated natural gas distribution utility systems located in the province of New Brunswick and the states of Georgia, Illinois, Iowa, Massachusetts, Missouri, New Hampshire and New York. It also owns and operates generating assets with a gross capacity of approximately 2.0 gigawatt (GW) and has investments in generating assets with approximately 0.3 GW of net generation capacity. The company generates and sells electrical energy, capacity, ancillary products, and renewable attributes produced by its renewable and clean power generation facilities. It has economic interests in hydroelectric, wind, solar, renewable natural gas, and thermal facilities. As of December 31, 2023, it had a combined net generating capacity attributable to the Renewable Energy Group of approximately 2.7 GW. The company was incorporated in 1988 and is headquartered in Oakville, Canada.

Engie Brasil Energia S.A., together with its subsidiaries, generates, sells, and trades in electrical energy in Brazil. The company operates 76 plants, including 11 hydroelectric power plants; 1 thermal power plants; 50 wind farms; 3 biomass; 9 photovoltaic and solar power plant; and 2 small hydroelectric plants. As of December 31, 2022, it had an installed capacity of 8,453.3 megawatts. The company also transports natural gas through 4,500 km of gas pipelines. In addition, it manufactures, wholesales, retails, operates, and maintains solar panels. The company was formerly known as Tractebel Energia S.A. and changed its name to Engie Brasil Energia S.A. in July 2016. The company was founded in 2005 and is headquartered in Florianópolis, Brazil. Engie Brasil Energia S.A. operates as a subsidiary of ENGIE Brasil Participações Ltda.

Huaneng Power International, Inc., together with its subsidiaries, engages in the generation and sale of electric power to the regional or provincial grid companies in the People's Republic of China and internationally. It is involved in the development, construction, operation, and management of power plants and related projects. The company also generates power from gas turbine, hydro, wind, photovoltaic, coal-fired, and biomass resources. In addition, it is involved in the sale of coal ash and lime; cargo loading and storage; port, warehousing, and conveying activities; photovoltaic power generation projects development and construction; and provision of thermal energy and cold energy services, as well as thermal heating services. Further, the company engages in the repair and maintenance of power equipment; supply of steam and hot water; plumbing pipe installation and repair; and energy engineering construction activities. Additionally, it is involved in the provision of transportation services; construction and operation of electricity distribution networks and heating pipe networks; energy supply, energy transmission, and substation project contracting activities; cargo handling and transportation; and port management, investment, and development activities. The company engages in the management of industrial water and waste, as well as provides environment engineering, and information technology and management consulting services. It also sells raw and processed coal; and offers central heat and desalinated water services. As of December 31, 2021, the company had a controlled generating capacity of 118,695 megawatts and an equity-based installed capacity of 103,875 megawatts. Huaneng Power International, Inc. was incorporated in 1994 and is based in Beijing, the People's Republic of China.

NRG Energy, Inc., together with its subsidiaries, operates as an energy and home services company in the United States and Canada. It operates through Texas; East; West/Services/Other; Vivint Smart Home; and Corporate Activities segments. The company produces and sells electricity generated using coal, oil, solar, and battery storage; natural gas; and a cloud-based home platform, including hardware, software, sales, installation, customer service, technical support, and professional monitoring solutions. It offers retail electricity and energy management, line and surge protection products, HVAC installation, repair and maintenance, home protection products, carbon offsets, back-up power stations, portable power, portable solar, and portable lighting; retail services comprising demand response, commodity sales, energy efficiency, and energy management solutions; and system power, distributed generation, renewable and low-carbon products, carbon management and specialty services, backup generation, storage and distributed solar, and energy advisory services. In addition, the company trades in power, natural gas, and related commodities; environmental products; weather products; and financial products, including forwards, futures, options, and swaps. It offers its products and services under the NRG, Reliant, Direct Energy, Green Mountain Energy, and Vivint. It serves residential, commercial, government, industrial, and wholesale customers. NRG Energy, Inc. was founded in 1989 and is headquartered in Houston, Texas.

OGE Energy Corp., together with its subsidiaries, operates as an energy services provider in the United States. The company generates, transmits, distributes, and sells electric energy. In addition, it provides retail electric service to approximately 896,000 customers, which covers a service area of approximately 30,000 square miles in Oklahoma and western Arkansas; and owns and operates coal-fired, natural gas-fired, wind-powered, and solar-powered generating assets. OGE Energy Corp. was founded in 1902 and is headquartered in Oklahoma City, Oklahoma.