Hydrogen and fuel cell technologies have experienced cycles of high expectations followed by impractical realities. This time around, however, falling renewable energy and fuel cell prices, stringent climate change requirements and the discrete involvement of China are step changes. The combination of these factors is leading to realistic potential for hydrogen’s role in the Grand Transition. Having conducted exploratory interviews with leaders from all around the globe, the World Energy Council is featuring eight use cases which illustrate hydrogen’s potential. These range from decarbonising hard-to-abate sectors such as heat, industry and transport to supporting the integration of renewables and providing an energy storage solution.