This conference firstly aims at discussing the implementation of the regulatory framework and market outcomes in the EU12 Member States (countries that joined the EU over the past years). Secondly, it wants to assess peculiarities and differences in regulation and market dynamics within EU15 Member States (countries that were members of the EU before the enlargement on 1st May 2004), characterized by a longer process of market liberalization and competition enhancement. The event is organised by the Florence School of Regulation at the European University Institute under the patronage of the Hungarian Presidency of the European Union.