The first Hydrogen Refueling Station (HRS) in Greece has been installed in the facilities of the National Centre for Scientific Research “DEMOKRITOS” (located in Region of Attica) in cooperation with MES ENERGY, within the framework of the project H2TRANS. The final product, consists of five main subsystems: a photovoltaic system for energy supply, a hydrogen production system using PEM electrolysis, a hydrogen storage system, a hydrogen refueling system and hydrogen-powered vehicles with hydrogen fuel cells.