Because of its ratification of the Kyoto Protocol and membership of European Union, Greece has agreed to regulate its greenhouse gas emissions and improve the penetration of renewable energy sources in its energy mix. This study outlines the modifications made to the Greek legislative framework in connection with the liberalization of its energy market and the promotion of renewable energy. The capability of Greece to fulfil these obligations is not examined. However, more rational, complete and long-term energy planning would have to be adopted in future because the new EU targets require more punctuality, reliability, effort and effectiveness than the present system allows.