The study discusses the potential future role of gas in a context of the COP21 decarbonisation targets, the growing share of renewable energy and price trends of carbon and other fossil fuels. Based on three demand scenarios (high, average, low), this paper evaluates the role of gas in the energy mix on a time horizon to 2040 including the respective impact on European infrastructure. A set of regulatory measures that may be required in each of the scenarios forms a further integral part of this study and provided the basis for further regulatory work.