District Energy in Cities: Unlocking the Potential of Energy Efficiency and Renewable Energy is among the first publication to provide concrete policy, finance and technology best practice guidance on addressing the heating and cooling sectors in cities through energy-efficiency improvements and the integration of renewable energy technology. It provides a glimpse into what integration and systems thinking look like in practice when addressing challenges in the energy, transport, buildings and industry sectors. The publication also consolidates data on the multiple benefits that cities, regions and countries have achieved from a transition to modern district energy systems.