Green hydrogen is a term now-a-days is being used especially after announcement of National Hydrogen Energy Mission (NHEM). While announcing the motive of this mission it was committed that it would be holding Green Hydrogen auctions. After announcing this mission all the companies engaged in the production of energy are planning and somewhat started to produce green hydrogen as fuel. The process used in the production of green hydrogen is called as Electrolysis. Under this process electric current is used to separate the hydrogen from oxygen in water. When the electricity used in this process is renewable source (wind or solar) then it produces green hydrogen. The energy obtained this way does not emit carbon dioxide into the atmosphere. The whole world is anxious about the global warming due to use of fossil fuels. Now the world is seeing ‘great white hope’ in Green Hydrogen. Due to great importance and big expectations from green hydrogen, an attempt has been made to write a paper on this burning topic. The efforts have been taken to explain the term ‘green hydrogen’, how it is obtained, types of hydrogen as fuel, what are the pro and cons of it, what is NHEM, which companies are engaged in the production of green hydrogen, etc.

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Keywords: Grey Hydrogen, Blue Hydrogen, Green Hydrogen, Global Warming, Electrolysis.