This paper forms part of a series of papers, seven in total, which have been requested by a number of colleagues to help them understand sustainability as it relates to dentistry. This paper focuses on energy and how the dental team can influence the amount and type of energy it uses, in order to become more sustainable. It is the authors' hope that this series of papers stimulates interest, debate and discussion and that, as well as being economically responsible, ultimately motivates and inspires dental practices to be more socially and environmentally sustainable; which will in turn help promote health and illness prevention.