Nuclear technologies have the potential to produce hydrogen at high efficiency and capacity factors and at the scale required for deep decarbonization without the space constraints of industrial-sized renewable technologies like wind and solar. While many advanced economies are working to deploy hydrogen in an effort to decarbonize, the hydrogen generation market itself can only reach its decarbonization potential if the hydrogen is produced through zero-carbon processes and at an affordable price. Using nuclear energy to create hydrogen allows both zero-carbon hydrogen production and for an affordable rate. Korea, through the Korea Atomic Energy Research Institute, has played a major role for nuclear technological localization and innovation. KAERI’s H2 economy roadmap includes the acceleration of H2 mobility and energy as well as the transition to green hydrogen by 2040.