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Advent Technologies Holdings, Inc., an advanced materials and technology development company, operates in the fuel cell and hydrogen technology markets in North America, Europe, and Asia. It develops, manufactures, and assembles fuel cell systems and critical components that determine the performance of hydrogen fuel cells and other energy systems. The company offers high-temperature proton exchange membrane (HT-PEM) fuel cells, including membrane electrode assemblies, bipolar plates, and reformers, as well as provides fuel-cell stack assembly and testing services. It serves stationary power, portable power, automotive, aviation, energy storage, and sensor markets. The company is headquartered in Boston, Massachusetts.

A2A S.p.A. engages in the production, sale, and distribution of gas and electricity, and district heating in Italy and internationally. The company generates electricity through hydroelectric, thermoelectric, photovoltaic, cogeneration, biomass, and wind plants; and sells and distributes gas. It also engages in the production and sale of heat produced through district heating networks; waste management activities, including collection and street sweeping, treatment, disposal, and recovery of materials and energy; and the construction and management of integrated waste disposal plants and systems. In addition, the company offers integrated water cycle management services; and technical consultancy services relating to energy efficiency certificates. Further, it is involved in the management of public lighting systems and street lights, and water purification and sewer activities, as well as offers garbage collection, street sweeping, video surveillance, energy efficiency, and electric mobility services. A2A S.p.A. is headquartered in Milan, Italy.

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.