EU requires a strong commitment from all Member States to meet post-2020 targets. To meet the targets imposed by Europe it is necessary to improve the penetration of the renewables like wind and solar. The main problem associated to the renewables is linked to their intermittency nature, indeed the power produced from solar and wind is subjected to daily and seasonal fluctuations which give rise to a grid stability problem. This will result in produce mismatching between power produced by the renewable energy sources system and requested power from the grid, leading to a period of over-production by the renewable energy sources and other of energy shortage for the users.