This report summarizes the Next-Generation Wind and Solar Power study, which was carried out by the International Energy Agency (IEA) as part of its Grid Integration of Variable Renewables (GIVAR) programme. The report contributes to the work of the Multilateral Wind and Solar Working Group as part of the Clean Energy Ministerial. It focuses on the contribution that next-generation wind and solar power technology can make to transforming power systems around the globe when combined with advanced, system-friendly deployment strategies.