The IRENA Coalition for Action launched a white paper Sector coupling: a key concept for accelerating the energy transition. This white paper has been developed jointly by members of the Coalition’s Working Group on Towards 100% Renewable Energy. Building on a selection of sector coupling case studies based on information from and first-hand interviews with company and country representative, the paper provides an overview of sector coupling as a strategy to increase energy system flexibility and reliability through direct or indirect use of electricity across end-use sectors. The white paper specifically aims to support governments and companies in the decision-making and implementation process of using sector coupling as a powerful tool towards 100% renewable energy and a net-zero emissions future.