How much water is needed to produce green hydrogen through electrolysis?

Electrolysis on a chemical level takes around 9 liters of water for one kilogram of hydrogen. Water demand in the total plant usually is about 10-15 liters per kilogram, when purification losses and the auxiliary system are considered.

Does green hydrogen production significantly impact local freshwater resources?

At a small scale, the effect is marginal. Nevertheless, at an industrial or gigawatt scale, the aggregated demand might become considerable in regions that suffer from water scarcity, especially if projects mainly depend on freshwater sources.

Can seawater or treated wastewater be used for hydrogen production?

Certainly. Purified wastewater may be used after purification, whereas seawater may be used following desalination. Both alternatives lessen the pressure on freshwater resources and are being progressively favoured for large-scale hydrogen facilities.

How does water scarcity affect the scalability of green hydrogen projects?

Water shortage may limit the capacity of a plant, cause permit delays, raise the operating risk level, and have an impact on the local community's approval. The projects located in water-stressed areas must have alternative sources available in order to be able to scale up in a reliable way.

What strategies improve water efficiency in green hydrogen plants?

Essential strategies are high-efficiency electrolysers, sophisticated water recovery methods, closed-loop cooling, prompt monitoring, and co-locating plants with wastewater treatment or desalination facilities.

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