One of the main targets of the European Green Deal is renewable energies to account for 32% of energy production by the year 2030. As a matter of fact, clean energy production is only one side of the coin as there seems to be some underestimation of the importance of energy efficiency and energy saving. Needless to say, it will be much easier to meet the clean energy goals as far as the reduction of the emissions greenhouses gases is concerned, when the overall energy demand is much lower.