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The AES Corporation, together with its subsidiaries, operates as a diversified power generation and utility company in the United States and internationally. The company owns and/or operates power plants to generate and sell power to customers, such as utilities, industrial users, and other intermediaries; owns and/or operates utilities to generate or purchase, distribute, transmit, and sell electricity to end-user customers in the residential, commercial, industrial, and governmental sectors; and generates and sells electricity on the wholesale market. It uses various fuels and technologies to generate electricity, such as coal, gas, hydro, wind, solar, and biomass, as well as renewables comprising energy storage and landfill gas. The company owns and/or operates a generation portfolio of approximately 34,596 megawatts and distributes power to 2.6 million customers. The company was formerly known as Applied Energy Services, Inc. and changed its name to The AES Corporation in April 2000. The AES Corporation was incorporated in 1981 and is headquartered in Arlington, Virginia.

The Hong Kong and China Gas Company Limited, together with its subsidiaries, produces, distributes, and markets gas, water supply and energy services in Hong Kong and Mainland China. It is involved in the provision of smart energy, piped city-gas, upstream and midstream projects, water supply and wastewater treatment, urban waste resource utilization, and natural gas filling stations, as well as new energy exploration and utilization activities. The company develops new energy projects that are low in emissions and pollution, which includes clean coal chemical business, liquefaction of methane, etc., as well as supplies town gas. It also provides network connectivity, data center, and ICT services, as well as engineering, procurement, and construction services. In addition, the company offers consultancy and engineering contractor services, including utilities installation, infrastructure construction, and civil and building services engineering for public and private projects; and designs and manufactures gas meters and metering systems. Further, it is involved in water supply, and domestic sewage and industrial wastewater treatment activities. Additionally, the company manufactures polyethylene piping and fittings; as well as engages in the software development, solution implementation, and systems integration activities. The Hong Kong and China Gas Company Limited was founded in 1862 and is headquartered in North Point, Hong Kong.

RWE Aktiengesellschaft generates and supplies electricity from renewable and conventional sources in Germany, the United Kingdom, rest of Europe, North America, and internationally. It operates through five segments: Offshore Wind; Onshore Wind/Solar; Hydro/Biomass/Gas; Supply & Trading; and Coal/Nuclear. The company generates wind, hydro, solar, nuclear, gas, and biomass electricity. It also trades in electricity, gas, and energy commodities; operates gas storage facilities; and engages in battery storage activities. The company serves commercial, industrial, and corporate customers. RWE Aktiengesellschaft was founded in 1898 and is headquartered in Essen, Germany.

ENN Energy Holdings Limited, an investment holding company, engages in the investment, construction, operation, and management of gas pipeline infrastructures; and integrated energy, and vehicle and ship refueling stations in the People's Republic of China. It operates through five segments: Retail Gas Sales Business, Integrated Energy Business, Wholesale of Gas, Construction and Installation, and Value Added Business. The company also sells and distributes piped gas, liquefied natural gas, and other multi-energy products; and provides other services in relation to energy supply. In addition, it is involved in the business of energy trading; retail of gas pipelines, and related materials and equipment; transportation of oil products and gas; and sourcing and sell of LNG, as well as wholesale and retail of LNG, CNG, gas equipment, appliances, and others; and provision of financial services. As of December 31, 2021, the company served approximately 25 million residential customers and 200,000 commercial/industrial customers. The company was formerly known as XinAo Gas Holdings Limited and changed its name to ENN Energy Holdings Limited in September 2010. ENN Energy Holdings Limited was founded in 1992 and is headquartered in Langfang, China.