Transcript:

With the hydrogen economy just around the corner, it is time to take a look at the various colours assigned to hydrogen depending on its source.

The largest source of hydrogen today is from steam methane reforming, from the SMR process. That hydrogen is grey hydrogen. If we add technology to the grey hydrogen process to capture the CO₂ and prevent it from going up into the atmosphere, it becomes blue hydrogen.

If the source of the hydrogen is coming from coal, gasification of coal, it becomes brown hydrogen.

The other source of hydrogen is to split water. If we split water using renewable electricity, electricity from solar or wind or such things, that becomes green hydrogen. If the source of the electricity for water splitting comes from nuclear power, it becomes pink hydrogen.

When the source of electricity for splitting water comes from the grid, it becomes yellow hydrogen.

White hydrogen is the hydrogen that comes directly from the ground during the fracking process.

And there is turquoise hydrogen. Turquoise hydrogen is got when we use thermal energy to split methane to make hydrogen.