To elaborate further on this aspect, figure shows the volume and weight of the storage molecule globally produced over one year for the four cases. The amount of fuel to produce is two to three times larger for FCEVs than for BEVs in all the cases studied. Methanol shows a significant advantage in terms of volume required for storage (at 200 bar), even though the mass produced is much larger. This is due to the different physical properties of the two fuels and to the lower combustion enthalpy of methanol. It is important to highlight that this large difference can become decisive in the selection of the storage molecule, especially when the storage volume available is limited, or when the products need to be transported over long distances . The difference between electricity and H2 efficiency of use has an important influence also on the chemical synthesis plant size, which is in the order of 25-30 MW for the storage of electricity and 60-70 MW for the storage of H2.