How grey, blue and green hydrogen are made

Grey hydrogen

Hydrogen is extracted from fossil gas releasing CO2 emissions into the air

CO2

Hydrogen

Blue hydrogen

Hydrogen is extracted from fossil gas before CO2 emissions are trapped and stored permanently underground

Hydrogen

Fossil gas

Underground

storage

CO2

Green hydrogen

Hydrogen is extracted from water using renewable electricity and releasing oxygen into the air

Renewable

electricity

O2

Hydrogen

Water

Grey hydrogen

Green hydrogen

Blue hydrogen

Hydrogen is extracted from fossil gas releasing CO2 emissions into the air

Hydrogen is extracted from water using renewable electricity and releasing oxygen into the air

Hydrogen is extracted from fossil gas before CO2 emissions are trapped and stored permanently underground

CO2

O2

Renewable

electricity

Hydrogen

Hydrogen

Hydrogen

Fossil gas

Underground

storage

Water

CO2