Frequently Asked Questions

What is the difference between grey, blue and green hydrogen?

Hydrogen has no color. The color of the hydrogen refers to its production process.

  • Grey hydrogen is produced using natural gas, releasing CO2 into the air through the chimney.
  • Blue hydrogen is produced in the same way as grey hydrogen (using natural gas), but here the CO2 produced is stored underground instead of in the air.
  • If the hydrogen is produced by green electricity through an electrolysis process, the hydrogen is referred to as ‘green’.

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