The energy transition in cities promises to transform the urban environment, with impacts that extend well beyond the energy sector. It will shape transport, buildings, land use and a host of other sectors. Even within the energy sector, the adoption of renewable energy involves more than a shift in energy sources; it also includes an emphasis on greater energy efficiency and modified consumption patterns, all of which could remake cities in ways that benefit their inhabitants and our planet alike. Renewable Energy Policies for Cities: Power Sector is intended to help policy makers accelerate efforts to create sustainable cities powered by renewables.