Hydrogen can be used to power vehicles, generate electricity, power the industry, and heat our homes and businesses. It can be a clean and renewable source of energy and can make a huge difference in lowering our carbon emissions, Hydrogen is assigned different colors based on the source it was produced from and the process used to separate it, because It all comes down to the way Hydrogen is produced. How Hydrogen is created can generate carbon emissions. The colors of different types of Hydrogen are: grey, blue and green hydrogen, though there are eight colors, including yellow, white, brown pink and turquoise Green hydrogen is produced through electrolysis, a process where electric currents from renewable energy sources (such as solar, hydro or wind power) separate water into hydrogen and oxygen molecules. The hydrogen is then stored as energy in a fuel cell, which allows the transferring of energy for use to either power a car or light a house. Because the energy used in this process comes from renewable sources, the process does not release any carbon emissions into the atmosphere.
Hydrogen, like electricity, is an energy carrier that must be produced from another substance. Hydrogen can be produced—separated—from a variety of sources including water, fossil fuels, or biomass and used as a source of energy or fuel. Hydrogen has the highest energy content of any common fuel by weight (about three times more than gasoline), which is why it is used as a rocket fuel and in fuel cells to produce electricity on some spacecraft.