HIVERED is going to study, in a first stage, the stability of the electrolysis process when the electrolyzer is fed by a photovoltaic park with a power close to its own. For this purpose, a simulation stage of the microgrid and the control system will be carried out (for this purpose, the LEMUR group of Uniovi will be involved). In a second phase, a demonstrator will be assembled and tests will be carried out to confirm the results of the simulation in terms of stability and process control. The electrolyzer used in the demonstrator will be a pressurized alkaline one.