 How can the IAEA help make sure that nuclear energy is sustainable? With global energy demand constantly rising, nuclear energy can help ensure access to affordable, reliable and low-carbon energy. For the sustainable development of nuclear energy, in the year 2000, IAEA member states initiated the International Project on Innovative Nuclear Reactors and Fuel Cycles in Bro. INPRO helps countries assess national nuclear energy strategies, charts nuclear energy scenarios and coordinates studies on innovations. INPRO uses a detailed methodology to assess whether nuclear energy development is sustainable. This methodology covers six areas that match the United Nations definition of sustainable development. Affordability, nuclear safety, radioactive waste management, non-proliferation, environmental impacts and governance infrastructure. Through national assessments, member states can make informed decisions on their future nuclear energy systems. INPRO's modeling framework and analytical tools help member states formulate global and regional nuclear energy development scenarios. These models explore how different approaches, including increased nuclear trade and collaboration among countries, can boost sustainability. For nuclear energy to play a substantial role in the global energy supply, both technical and institutional innovations are needed. For this, INPRO brings together technology developers and users, including newcomer countries to nuclear power, to examine innovative reactor and fuel cycle concepts. The results of joint analyses and assessments under the IAEA's INPRO project provide an added value to stakeholders in the nuclear and scientific communities for sustainable nuclear energy development.