The H2 produced is extremely volatile due to its very low density, which makes its transport to users very demanding. In gaseous form, transport by pipeline is conceivable; in liquefied form, hydrogen can be transported to the consumer in insulated tankers or tank trucks. In this case, non-negligible fluctuation rates must be expected. In addition, H2 has the property of embrittling materials, which must be taken into account in the service life and design of all plant components. Particularly for the production of 'green' hydrogen, it must be ensured at the production site that not only sufficient 'green' electricity, but in particular sufficient water of the best quality is available.