FR There are several different colours of hydrogen:
- Green hydrogen is produced by water electrolysis, which involves passing an electric current from a renewable source through the water. To find out more
- Grey hydrogen is produced by steam methane reforming: methane (CH4) reacts when water vapour (H2O) is added to it, releasing hydrogen and CO2.
- If the CO2 is captured at this stage for storage or use, the hydrogen is known as blue hydrogen.
- Pink hydrogen, or yellow hydrogen, is produced by water electrolysis using nuclear energy.
- White hydrogen, or natural hydrogen, refers to hydrogen that occurs naturally below ground.
Because no CO2 is emitted during its production, green, blue, or yellow hydrogen is also referred to as "decarbonised hydrogen" or "low-carbon hydrogen".
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