The nuclear power renaissance in the 21st century: Analyzing past trends, present status, and future outlook

Global nuclear energy is witnessing a measurable resurgence as a strategic solution for climate mitigation and energy security. As of 2024, 417 nuclear reactors operating in 32 countries generate approximately 2667 TWh about 8.96% of global electricity. Expansion is geographically asymmetric: China leads with 24 reactors under construction and 43 proposed, while legacy nuclear nations like the United States and France face limited additions but significant retirements. According to IEA and IAEA projections, global capacity must grow from 416 GW in 2024 to 874–1017 GW by 2050 to support net-zero pathways. However, the IAEA reports 215 reactors have been permanently retired globally, including 41 in the U.S. and 36 in the U.K., threatening net growth unless aggressive deployment continues. Small Modular Reactors (SMRs) and policy reforms offer critical mitigation, with over 127 SMR designs under development globally. This study presents a comprehensive, data-driven analysis of nuclear power's evolving role, drawing on historical trends, real-time reactor statistics, and authoritative forecasts. The findings underscore nuclear's indispensable role in a low-carbon energy future, provided current retirement trends are counterbalanced by accelerated licensing, financing, and innovation.