Book excerpt: The Dynamics of EU External Energy Relations examines the behaviour of the European Commission in EU external energy relations paying particular attention to the dynamics existing between the Commission and the member states. It examines the Commission as a constrained policy-entrepreneur trying to expand its power, budget and competences, yet frustrated by member states protective of their national sovereignty. Analysing the Commission as agent and the member states as its principals, the book proposes a more nuanced examination of behaviour where the agent tries to satisfy its own interests but is still responsive to the preferences of the principals. Using a wide range of original primary and secondary data, the book argues that EU external energy relations reflect the dynamics of the relations between the Commission and the member states. This book will be of key interest to scholars and students of European Union studies and politics, EU energy and foreign policy, and more broadly to European politics and international relations.