The race to scale up green hydrogen (FT)

… For decades, hydrogen has been hailed as a potentially revolutionary alternative to fossil fuels …

1. Green hydrogen - Made by using clean electricity from renewable energy technologies to electrolyse water (H2O), separating the hydrogen atom within it from its molecular twin oxygen. Currently very expensive.

2. Blue hydrogen - Produced using natural gas but with carbon emissions being captured and stored, or reused. Negligible amounts in production due to a lack of capture projects.

3. Grey hydrogen - This is the most common form of hydrogen production. It comes from natural gas via steam methane reformation but without emissions capture.

4. Brown hydrogen - The cheapest way to make hydrogen but also the most environmentally damaging due to the use of thermal coal in the production process.

5. Turquoise hydrogen - Uses a process called methane pyrolysis to produce hydrogen and solid carbon. Not proven at scale. Concerns around methane leakage.

https://www.ft.com/content/7eac54ee-f1d1-4ebc-9573-b52f87d00240