Another
minor contribution is given by 1,2 GWh/y of electricity auto-produced by the photovoltaic system installed in the
WWTP in Castiglione T.se. Such values were subtracted to the respective amount of total energy consumption in
order to obtain the net energy consumption that represent the energy purchased from the national grid and is equal to
4,037 MWh/y for the Raw water extraction and 58,865 MWh/y for the Wastewater treatment.