Renewable energy sources (RES) not only decarbonize the economy through clean power production, it also enables the substitution of fossil fuels in mobility, reduces EU energy import dependence and increases security of supply. Moreover, it allows to cut back on highly dangerous air emissions such as NOx, SOx or particulates. The EU has also set a long-term goal of reducing GHG emissions by 80-95%, when compared to 1990 levels, by 2050. Mass implementation of RES is a firm decision that the EU has already made. However, RES large scale deployment, especially wind and solar generation, is hampered by its intrinsic variability, intermittency and unpredictability. Another handicap of RES is the large fluctuations in frequency, grid voltage and power flow that occur with the integration of these generators onto the grid. Power to H2 provides a suitable energy storage solution enabling the mass implementation of clean energy sources onto the grid. Simultaneously, it can benefit from discounts on the price of RES oversupply that otherwise will be curtailed to produce large quantities of low cost H2. These facts make power to H2 systems profitable even now and turns H2 into a solution sine qua non the world cannot achieve 2050 goals on GHG emissions reduction and the transition to a green economy.