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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.

Valener Inc., through its subsidiaries, engages in the natural gas business in Canada and the United States. Its Energy Distribution segment engages in the natural gas distribution activities in Quebec and Vermont, as well as electricity distribution activities in Vermont to 205,000 customers through a pipeline network of approximately 11,000 kilometers in Quebec, as well as 50,000 customers in residential, commercial, and industrial markets through a network of 1,500 kilometers. This segment is also involved in the distribution, transportation, production, purchase, and sale of electricity to 265,000 customers through 16,300 kilometers of overhead distribution lines; 2,000 kilometers of underground distribution lines; and 2,700 kilometers of overhead transmission lines. It operates 2 wind farms with an installed capacity of 69 megawatts, as well as 21 solar farms with an installed capacity of 25 megawatts in Vermont; and 44 hydroelectric generating stations in New England. The company's Natural Gas Transportation segment operates 2 pipelines totaling 98 kilometers in northwest Quebec; 575- kilometers pipeline in Quebec; and 489- kilometers pipeline from the Quebec border to the suburbs of Boston. Its Electricity Production segment develops and owns solar power generation projects in the United States; and 3 wind farms with a total installed capacity of 340 megawatts on the private lands of Seigneurie de Beaupré. The company's Energy Services, Storage and Other segment engages in the sale of liquefied natural gas as a fuel or energy product; electric power generation and transmission from a thermal power plant, as well as the sale, leasing, and maintenance of natural gas appliances; and underground natural gas storage activities in Quebec. Valener Inc. was incorporated in 2010 and is based in Montreal, Canada.