“…Indeed, rapid population growth, deterioration of suburban areas and social inequalities, together with the increase in citizens' expectations of the quality of life and supplied services, make sustainable development policies a relevant key for energy saving and for the social participation of citizens. These topics have become the main focus in urban areas through promoting the transition to a competitive energy system based on several specific actions: reducing energy consumption and carbon footprints, supplying low-cost and low-carbon power, employing alternative fuels and mobile energy sources, employing a single and smart power network, researching new knowledge and technologies, sound decision-making, public commitment and an energy and ICT innovation market with capacity absorption [15,16]. Therefore, the attention on sustainable development drove, on one hand, to smart cities, and on the other, to PEDs (positive energy districts) [17,18].…”