For the past two decades, hydrogen has rarely been mentioned by proponents of renewable energy although it is frequently used in the ammonia production, petrochemical and oil refining industries. However, recently the adoption of hydrogen usage has been accelerating in all sectors as it is versatile and can be produced from many energy sources. Hydrogen fuels thus present an untapped potential as a clean form of energy if the world embraces its adoption and usage. Currently, the annual production of hydrogen is about 120 million tonnes globally, of which two-thirds is pure hydrogen and one-third is mixed with other gases. Hydrogen is a clean energy source which can be produced from either fossil fuels or renewables. As of today, about 95% of hydrogen is produced from coal and gas — known as “grey hydrogen”, and only small amounts are produced with Carbon Capture, Sequestration and Storage (CCS) — known as “blue hydrogen”. Less than 5% of total hydrogen production is produced from renewables — “green hydrogen”.