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. The main purpose of system-friendly deployment is to maximize overall value to the power and wider energy system—in contrast to minimizing the generation cost of wind and solar power in isolation. This summary places such strategies in the context of integrating renewables in a wider system, and it presents policymakers with concrete recommendations for unlocking this contribution. The report also features brief country case studies that were carried out as part of the study.