Sustainability of technological innovation investiments. Photovoltaic panels case study

as photovoltaic panels. In the case study analysed are shown the benefits obtained from the investments of the central Italy after installing photovoltaic systems. The total expenditure for the electricity purchase is € 52.326, while the total benefit of the investment is € 18.789, equal in percentage to a 53% energy saving over a period of 20 years. The company expeniture in the absence of a photovoltaic system is equal to € 109.03, while in the presence of a plant, considering also all costs incurred for € 93.090, with a percentage of profit on the investment made equal to almost 15% in 20 years.