This nuclear energy roadmap has been prepared jointly by the International Energy Agency (IEA) and the OECD Nuclear Energy Agency (NEA). Unlike most other low-carbon energy sources, nuclear energy is a mature technology that has been in use for more than 50 years. The latest designs for nuclear power plants build on this experience to offer enhanced safety and performance, and are ready for wider deployment over the next few years. Several countries are reactivating dormant nuclear programmes, while others are considering nuclear for the first time. In the longer term, there is great potential for new developments in nuclear energy technology to enhance the role of nuclear power in a sustainable energy future.