What is green hydrogen?

Hydrogen is produced via electrolysis – a process in which water is split into hydrogen and oxygen using electricity. An important factor for producing green hydrogen is that the electricity used must come from renewable sources.

This is in contrast to, for example:

• Grey hydrogen produced from fossil fuels
• Pink hydrogen, which does not produce CO₂ as it uses nuclear energy, but does produce radioactive waste
• And blue hydrogen, in which CO₂ is separated and stored (carbon capture)

That means electrolysis is the first – and crucial – step in the hydrogen value chain.