The purpose of this book is twofold. First, it aims to explain the general framework for cooperation in the energy sector in Europe, with a conceptual basis that allows for a better understanding of the dynamics that led to its existence. Second, the volume deals with Romania both as a representative case for the region, given the commonalities raised by the transition process in the last three decades, and also as a country with a specific energy agenda, with implications for internal and foreign policy that can only be perceived and understood in the Romanian context.