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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.

Enagás, S.A. engages in the development, operation, and maintenance of gas infrastructures in Spain and internationally. The company provides gas transportation services through gas pipelines; natural gas regasification services; and operates underground storage facilities. It is involved in the operation and technical management of the basic network and secondary transportation network for natural gas. The company operates approximately 12,000 kilometers of gas pipelines, 19 compressor stations and 416 regulation and metering stations. Enagás, S.A. was founded in 1972 and is based in Madrid, Spain.

ENGIE SA engages in the power, natural gas, and energy services businesses. It operates through Renewables, Networks, Energy Solutions, FlexGen, Retail, Nuclear, and Others segments. The Renewables segment comprises renewable energy generation activities, including financing, construction, operation, and maintenance of renewable energy facilities using various energy sources, such as hydroelectric, onshore wind, photovoltaic solar, offshore wind, and geothermal. The Networks segment comprises the electricity and gas infrastructure activities and projects, including the management and development of gas and electricity transportation networks and natural gas distribution networks in and outside of Europe, natural gas underground storage in Europe, and regasification infrastructure in France and Chile. The Energy Solutions encompasses the construction and management of decentralized energy networks to produce energy and related services. The FlexGen segment operates flexible thermal generation and electricity, pumping, and battery storage facilities; solutions for decarbonizing industry with low-carbon hydrogen; and financing, construction, and operation of desalination plants. The Retail segment engages in the sale of gas and electricity to professional, individual, and residential clients. The Nuclear segment engages in the nuclear power generation activities. The others segment sells energy to companies and offers energy management services and solutions. The company was formerly known as GDF SUEZ S.A. and changed its name to ENGIE SA in April 2015. The company was founded in 1880 and is headquartered in Courbevoie, France.