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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.

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.

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.