This technology is based on generating hydrogen, a universal, light and highly reactive fuel, through a chemical process known as electrolysis. This method uses an electric current to separate the hydrogen from the oxygen in water, so if this electricity is obtained

This way of obtaining green hydrogen, as the IEA points out, would save the 830 million tonnes of CO₂ per year that originate when hydrogen is produced using fossil fuels. Replacing all the world’s grey hydrogen would also require an additional 3,000 TWh of

Obtaining green hydrogen by electrolysis from renewable energy consists of the decomposition of water molecules (H₂O) into oxygen (O₂) and hydrogen (H₂).

1. The water used for electrolysis must contain salts and minerals to conduct electricity.
2. Two electrodes are immersed in the water and connected to a power supply, applying a direct current.
3. The dissociation of hydrogen and oxygen occurs when the electrodes attract oppositely charged ions to themselves.
4. During electrolysis, an oxidation-reduction reaction takes place under the effect of electricity.

Hydrogen is the most abundant chemical element in nature. Its global demand as a fuel has tripled since 1975, as noted by the IEA, reaching 70 million tonnes per year in 2018. It is also a clean energy source that emits only water vapour and leaves no contaminants

The relationship between hydrogen and industry goes back a long way. The gas has been used as a fuel since the early 19th century for cars, airships and spacecraft. The decarbonisation of the world economy, a process that cannot be postponed, will make it more