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Energy efficiency is among the cheapest, cleanest, and most widely available of energy resources. Improved energy efficiency provides opportunities to sustainably expand energy services and support development and economic growth, contributing to higher living standards, as well as reducing greenhouse gas emissions. In developing countries, where demand for energy is growing rapidly, the potential for energy efficiency improvements is significant, particularly in the residential sector. The purpose of this guide is to raise awareness of behavioural approaches to achieving development outcomes, demonstrate the role that behavioural sciences can play in promoting energy efficiency, and provide guidance on how to integrate behaviour change approaches into projects.