Nowadays, the climate change threat represents the biggest challenge. The main cause is the emission of greenhouse gases (GHG), which are strictly related to fossil fuels exploitation. It is necessary to reassess the future scenarios in a sustainable way, where the use of renewable energy sources (RES) represents the pivotal point of the energy transition. The intermittent nature of RES requires a different strategy when compared to fossils resources. Energy storage systems represent the main solution to match energy consumption with production. In this framework, hydrogen storage represents one of the most valuable options. The hydrogen, obtained from water electrolysis, involves electricity from RES.