This book discusses energy policy within the framework of the expansion of renewable energy sources (RES) and increasing resource use efficiency. In this book, the term ‘resource efficiency’ is defined as deriving the most value from resource inputs related to energy production, while incorporating energy efficiency. The authors highlight the drivers, policy approaches, governance issues and management problems related to the reduction of dependency on fossil fuels by focusing on RES and resource efficiency. Mouraviev and Koulori argue that enhancing energy security requires a new approach, integrating two core components: the emphasis on increasing energy production from renewable sources and resource use efficiency, which forms a contrast to the traditional understanding of energy security as security of supply. Blending theory with practice using several case studies, this original book provides a novel conceptualisation of energy security that will be of interest and value to practitioners and policy makers as well as scholars and researchers.