The EU has great medium term goals according to the common energy market. Its aim is to create a competition based productive, competitive gas market with respect to environmental aspects as well. Our aim is to examine with all of our restrictions, what (may) happen on this special field of energy market, closer on the gas market, by all the changes made within the framework of EU directed liberalization. More precisely, the aim of this study is to find out whether it is possible to handle the EU as a unity and to create one energy policy for the 27 Member States? Using more than a dozen of indicators chosen mainly from OECD studies and national statistics of countries we would like to classify EU Member States into some possibly homogeneous groups. We try to find out, whether it is possible to make some homogeneous clusters, or there may be some Member States left, as outsiders, which do not produce the expected conditions for example in state control, public ownership, entry regulation, and so on? We try to answer on the question why the common energy policy is so sensitive topic, and why a common energy policy cannot really be created without its full perception by Member States? By the help of this research we would like to get closer to answering our basic question, which refers to that, whether it is possible to extract a real EU level competition by liberalization in a market that has so different characteristics among member countries