Arrangement to optimize the production of hydrogen

Arrangement to optimize the production of hydrogen, the arrangement comprising at least a solar energy unit (12) and a wave and/or tidal energy recovery system (2), which are arranged to produce renewable energy, a water purification unit (5) and an electrolysis unit (9), which is arranged to produce hydrogen from pure water produced by the water purification unit (5), and the electrolysis unit (9) and the water purification unit (5) are powered by the renewable energy produced by the solar energy unit (12) and the wave and/or tidal energy recovery system (2), and the arrangement comprises a buffer unit (6), into which pure water is supplied from the water purification unit (5) during periods when the production of the renewable energy exceeds the need of energy of the electrolysis unit (9), characterized in that during periods when the production of the renewable energy is lower than what is needed by the water purification unit (5) and the electrolysis unit (9), the produced renewable energy is arranged to be used by the electrolysis unit (9) and pure water is supplied from the buffer unit (6) to the electrolysis unit (9).