This synthesis document offers an overview of existing evaluative evidence on various dimensions of importance to RPSP based on the findings of previous IEU evaluations, including repeating selected findings from the first RPSP evaluation. It will provide preliminary lessons that can feed into the ongoing drafting of a new RPSP Strategy. It will also serve as a basis for the 2023 IEU’s evaluation of the RPSP, which aims to update the GCF Secretariat and the Board on the effectiveness and efficiency of the RPSP in developing countries.