This book argues that while there is scholarly agreement on the relevance of sufficiency as a sustainability principle, there is no consensus about its precise contribution to change. Using discourse analysis, the author shows that sufficiency is also charged with multiple meanings in the context of the practices used in energy and climate model regions. It criticises the fact that the most common interpretation of sufficiency is also the one with the weakest transformative potential and shows how this untapped potential can be unleashed. This work can be used by researchers and policymakers who want to help sufficiency make its urgently needed contribution to sustainability. The author is a researcher in the fields of sustainability, democracy and energy.