The so-called hydrogen economy is based on hydrogen produced from water using solar energy. The gas is then burned as a fuel:

A primary advantage of hydrogen as a fuel is that it is nonpolluting. A major disadvantage is that it is a gas and therefore is harder to store than liquids or solids. Calculate the volume of hydrogen gas at 25°C and 1.00 atm required to produce an amount of energy equivalent to that produced by the combustion of a gallon of octane (C8H18). The density of octane is 2.66 kg/gal, and its standard enthalpy of formation is 2249.9 kJ/mol.

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2H2(g) + O2(g) --→ 2H20(1)