Representatives from leading global technical institutes and the G-PST Founding System Operators are actively defining near-term applied research priorities and programs to support system operators in achieving very high penetrations (i.e., >80%) of inverter-based variable renewable energy resources on their power systems over the next decade. This process is systematically mapping out the state-of-the-art in research, industry and practitioner communities around the world, and identifying key knowledge gaps that can be filled by cutting-edge research activities in the priority areas. It will then develop research proposals and seek to secure support from national research program managers for collaborative research with the Founding System Operators. Ultimately, this research agenda will be pursued by all participating system operators and technical institutes in the G-PST Consortium, with insights efficiently disseminated for broad adaptation and application.