This article is part two of a study on energy market liberalization in the European Union. In order to harmonize and liberalize the internal market in natural gas in the European Union, over 15 were adopted three legislative packages successive measures which address market access, transparency and regulation, consumer protection, supporting interconnection and adequate levels of supply. From a macroeconomic perspective empirical evidence suggests that the liberalization of the gas market will bring positive effects in terms of lower prices and better service for consumers. Given the evolution of liberalization, this paper will show that liberalization has not delivered the expected results. European gas market reform was followed by a double approach. First, in accordance with EU directives, Member States were required to take at least a minimum set of key measures for the liberalization of national markets. Secondly, the European Commission has promoted efforts to improve the interfaces between national markets by improving cross-border trading rules.