The book covers both the content of sector-specific energy regulation and the application and impact of general EU law on energy markets. As far as sector-specific energy regulation is concerned, only the most fundamental elements are examined. These include third-party access, unbundling, investment in cross-border networks, energy trading, and market supervision. In respect of Treaty law, the focus is on three areas: the application of general EU competition law on energy markets; the impact of free-movement provisions in this area; and the application of state aid rules, which are examined both in a separate chapter and in relation to the promotion of renewable energy. This book, therefore, covers the most essential elements of EU energy law. It has primarily been written for students of two types. The first of these is the LLM student from outside the EU who may have prior knowledge of energy markets and their regulation at either upstream or downstream level, but lacks knowledge of the EU legal context. The second type is the student who understands the way in which the EU works, which is to say that they have previously taken a course in European law or European studies, but have not studied energy law in its own right. This book offers the first group a knowledge of EU energy regulation and its objectives, and the second an introduction to energy law. It is also suitable for engineers, economists, and others wishing to understand how EU energy law and policy work.