The world can double the share of renewables in its energy use by 2030. REmap 2030, a renewable energy roadmap, is the first study of global renewable energy potential to be based on data from official governmental sources. Prepared by the International Renewable Energy Agency (IRENA) in consultation with governments and other stakeholders worldwide, the roadmap encompasses 26 countries representing three-quarters of current energy demand. In determining the potential to scale up renewables, the study not only focuses on technologies, but also on the availability of financing, political will, skills, and the role of planning. The study finds that doubling of the share of renewable energy in total final energy consumption by 2030 would be nearly cost-neutral. When external costs that can be avoided by replacing conventional energy are taken into account, this ambitious transition even results in cost savings.