Hotels, in which belong to the tertiary building sector, rank among the highest in the energy consumption sectors. The Balearic Islands are a representative example of tourist islands, with more than 2.500 Hotel and touristic industries, which implies with its approximately a half million available beds, an increase in 50% of the population at high season. High energy consumption in hours with low Renewable energy production are additional problems in this case. From the information of 250 Hotels were studied in order to investigate the levels of energy consumption and sustainability among them with future zero emissions scenarios. This paper analyses available information concerning energy consumption in hotels, with a focus on Electric demand (most of them from HVAC systems). The aim is to determine a model for predict the energy consumption, and coupling it as much as possible, to the RES of energy demand. For arrive to this goal smart buildings can foster energy efficiency and tackle the reduction of CO2 emissions within the atmosphere. The Hotels can guarantee good lighting, ventilation, cooling rates, along with other aspects of building demands in real-time. Monitoring and sensing combined solutions with simple and efficient methods are the protagonists of advanced sustainable building technology, for instance, the implementation of smart strategies such as thermal storage or pumping systems.