Green hydrogen
Produced with renewable energy, the ideal method for producing hydrogen
Until the technology scales, it remains too expensive for widespread adoption
+
-
Blue hydrogen
+
-
Can be produced from natural gas
Requires carbon emissions to be captured and stored, which is expensive
Grey hydrogen
+
-
Manufactured from natural gas via steam methane reformation (SMR); currently the most common type
Doesn’t capture emissions
Brown hydrogen
+
-
The cheapest way to make hydrogen
Produced through coal gasification, making it the least green alternative