The low-carbon transition is ongoing everywhere. This Handbook, written by a group of senior and junior scholars from six continents and nineteen countries, explores the legal pathways of decarbonisation in the energy sector. What emerges is a composite picture. There are many roadblocks, but also a lot of legal innovation. The volume distils the legal knowledge which should help move forward the transition. Questions addressed include the differences between the decarbonization strategies of developed and developing countries, the pace of the transition, the management of multi-level governance systems, the pros and cons of different policy instruments, the planning of low-carbon infrastructures, the roles and meanings of energy justice. The Handbook can be drawn upon by legal scholars to compare decarbonisation pathways in several jurisdictions. Non-legal scholars can find information to be included in transition theories and decarbonization scenarios. Policymakers can discover contextual factors that should be taken into account when deciding how to support the transition.