Hydrogen economy means use of H2 (g) or H2 (l) as fuel. The advantage of hydrogen economy is
easy storage and transmission of energy in the form of dihydrogen and not as electricity.
it produces much more energy per mole than other substances.
the energy is stored in chemical way.
its combustion can be easily controlled.
The advantage of hydrogen economy is easy storage and transmission of hydrogen in the form of dihydrogen not in the form of electricity