Under these hypotheses, for the upgrading process the energy requirements referred to one kg of biogas processed are: 0.20 kWh/kg of electricity and 0.31 kWh/kg of heat. The pressure conditions of this method for the CO2 removal are favorable for the next distribution step, in fact, starting from 10 bars, the gas inlet into the natural gas distribution grid would not need a compression step after the PSA process. For this reason, the energy requirement for the distribution is only related to the compensation of the pressure drop. The compensation of the pressure drop is performed through compression stations which are fueled by the gas itself. Under the hypotheses that the efficiency of the compression stations is around 40% and that the mean transport distance is around 300 km, the energy requirement for the distribution by the NG grid is around 0.12 kWh/kg.