Due to different methods, technology and substrates, we distinguish between different colours of hydrogen. Increasingly, attention is being paid to the accompanying CO2 production in the various processes.

Grey hydrogen – it is produced in the process of steam reforming of hydrocarbons – SMR (Steam Methane Reforming).

Blue hydrogen – it is produced with the application of fossil fuels, whereas carbon capture methods – Carbon Capture Storage (CCS) or Carbon Capture Utilisation (CCU) – are used to reduce pollution levels in the process.

Black and brown hydrogen – the colours refer to hydrogen produced from conventional fuels. It is extracted from synthetic gas in coal mining methods. Brown, on the other hand, refers to production methods based on lignite coal.

Turquoise hydrogen – obtained by pyrolysis using, among other things, natural gas as a base feedstock. Process driven by heat generated by electricity.

Green hydrogen – the most desirable for the energy transition. It is produced by electrolysis using only green energy – produced from renewable sources.

Pink hydrogen is hydrogen produced by nuclear-powered electrolysis.