It results from the analysis of the graphs of Fig. 3.9 that countries with less use of gas for power generation (therefore more subject to the weather dependent residential sector demand) and having a more conti- nental climate have less flat demand profiles. Greece which combines the higher rate of gas use for power generation and the milder climate as well as a still immature residential market, has the more flat demand profile, i. e. the higher (yearly) ratio between average and maximum demand. These graphs also show that most of the gas demand for power generation comes from Italy, followed, far behind, by Greece, Hungary, Romania and Croatia 4) and that there is an important potential for increase of this type of demand in the Region. They, moreover, show that the highest daily demand remained at comparable level, across the period considered, in each country, being mainly affected by winter demand. This signal is particularly important for gas infrastructure operators in order to keep the safety and performance of gas systems, and the related underlying assets ready to face peak requirements. This is the main prerequisite to guarantee adequate security of supply standards to domestic, and to a higher level, Regional energy system.