Global energy is on the cusp of change, and it has become almost a truism that energy is in transition. But what does this notion mean exactly? This book explores the working hypothesis that, characteristically, the energy system requires a strategy of the international community of states to deliver sustainable energy to which all have access. This strategy is for establishing rules-based governance of the global energy value-cycle. The book has four substantive parts that bring together contributions of leading experts from academia and practice on the law, policy, and economics of energy. Part I, 'The prospects of energy transition', critically discusses the leading forecasts for energy and the strategies that resource-rich countries may adopt. Part II, 'Rules-based multilateral governance of the energy sector', details the development and sources of rules on energy. Part III, 'Competition and regulation in transboundary energy markets', discusses principal instruments of rules-based governance of energy. Part IV, 'Attracting investments and the challenges of multi-level governance', focuses on the critical governance of the right investments. This book is a flagship publication of the Centre for Energy, Petroleum and Mineral Law and Policy at the University of Dundee. It launches the Hart series 'Global Energy Law and Policy' and is edited by the series general editors Professors Peter D Cameron and Volker Roeben, and also Dr Xiaoyi Mu.