This Handbook brings together energy security experts to explore the implications of framing the energy debate in security terms, both in respect of the governance of energy systems and the practices associated with energy security. The contributors expertly review and analyse the key aspects and research issues in the emerging field of energy security, test the current state of knowledge, and provide suggestions for reflection and further analysis. This involves providing an account of the multiplicity of discourses and meanings of energy security, and contextualizing them. They also suggest a rewriting of energy security discourses and their representation in purely economic terms. This volume examines energy security and its conceptual and practical challenges from the perspectives of security of supply, security of demand, environmental change and human security. It will prove essential for students in the fields of global, international and national politics of energy, economics, and society as well as engineering. It will also appeal to policy practitioners and anybody interested in keeping the lights on, avoiding climate change, and providing a secure future for humanity.