The exponential increase in carbon dioxide emissions and the now imminent depletion of fossil fuels put the issue of energy at the forefront with the aim of investigating possible alternatives to the unsustainable modern energy system. The end point is represented by an autonomous and smart energy system. Over the years, research and studies have increased confidence in achieving the goal of a national energy system without fossil fuels, in which renewable sources lead the entire energy supply. The current energy system is characterized by a simple configuration in which the energy flows from the generation point to the customers without interconnections between the different sector.