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’ refers to the origin of natural gas which is typically cracked in a steam methane reformer. During this reforming process, CO2 is produced as a side product.
  • The hydrogen becomes ‘blue’ when the CO2 from its production process is captured and stored.
  • If the hydrogen is produced by green electricity through an electrolysis process, the hydrogen is tagged as ‘green’.
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