In order to reduce road transport emissions, the development of xEV is essential. To achieve the net-zero goal by 2050, Internal Combustion Engine (ICE) vehicles need to be replaced by vehicles with zero emissions, with a proper mix of Battery Electric Vehicles (BEV) and Fuel Cell Electric Vehicles (FCEV). FCEVs refueling at dedicated Hydrogen Refueling Station (HRS). Thesis’s aim is sizing the dedicated photovoltaic (PV) plant for renewable electricity, the electrolyzer for green H2 production, and the hydrogen storage vessel of the station to meet the daily demand of 1000 kg H2 for all the year. Other station’s component such as compressors, coolers, chillers, dispensers and other auxiliary devices, are not analyzed in this work due the fact that in the period of time of low irradiance they still require energy, so this becomes more challenging and requires a more thorough analysis.