16-03-2026 | Posted by Principia
For decades, nuclear power has been a cornerstone of reliable energy generation, providing clean electricity to millions around the world. Yet investment in nuclear technology waned primarily due to a combination of public sensitivities, political factors, and the resulting economics. Now, as nations seek sustainable and secure energy solutions, nuclear power appears to be making a strong comeback.
As the global demand for clean and dependable energy grows, nuclear power offers a unique combination of advantages that make it an essential part of the modern energy mix. Unlike fossil fuels, nuclear reactors produce zero carbon emissions during operation. As the world races to meet net-zero targets and combat climate change, nuclear power provides a dependable source of clean energy alongside renewables like wind and solar.
Except for refuelling and maintenance, nuclear plants operate continuously, making them one of the most reliable sources of electricity. Unlike solar and wind, which depend on weather conditions, nuclear offers consistent output, ensuring grid stability and energy security. Also, in an era of global energy uncertainty, nuclear power reduces dependence on imported fuels. Countries investing in nuclear can ensure a stable energy supply, shielding themselves from geopolitical fluctuations in oil and gas markets.
Modern nuclear technology is safer, more efficient, and more sustainable than ever before. Small Modular Reactors (SMRs), advanced fuel cycles, and next-generation reactors promise enhanced safety and reduced waste.
In this situation, Belgium decided recently to extend the operation of Doel 4 and Tihange 3 until at least 2035, reversing an earlier phase-out plan. France is investing heavily in its existing fleet, extending the lifespan of reactors beyond 40 years, and planning to build new EPR2 plants. Many U.S. reactors have received license extensions up to 80 years from the Nuclear Regulatory Commission (NRC). Japan is extending the life of its reactors beyond the previous 60-year limit and is also restarting more reactors post-Fukushima. Sweden has extended the life of existing reactors and plans to build at least two new ones. Finland has extended the operating licenses of its older reactors and recently commissioned Olkiluoto 3, a new-generation EPR reactor. South Korea reversed its previous nuclear phase-out plans, opting to extend the life of older reactors and invest in new nuclear projects.
The trend globally is shifting toward prolonging the life of existing nuclear plants and building new reactors as governments recognize nuclear power’s role in energy security, decarbonization, and grid stability.
A permanently nagging question is that posed by spent nuclear fuel (SNF) and radioactive waste. In the short term, spent fuel is stored in water-filled pools at nuclear reactor sites, with water providing cooling and radiation shielding. After cooling in pools for typically 5-10 years, SNF can be moved to dry casks at reactor sites or centralized facilities. The long-term strategy is disposal in a deep geological repository, burying the waste in stable rock formations; Finland’s Onkalo repository is the first operational one, with others planned in Sweden, Canada, and the U.S.
Processes like pyroprocessing, vitrification, WATSS (Waste to Stable Salt), and similar approaches to chemically stabilizing SNF show promise for improving nuclear waste management. These processes aim to convert SNF or high-level radioactive waste into chemically stable, non-leachable forms, reducing long-term risks associated with storage and disposal. Most are still in development and demonstration and their scalability and costs need to be confirmed.
There is also the possibility of reprocessing SNF, extracting uranium and plutonium for reuse in new reactor fuel. This is done in France, Russia, and Japan, and has been done until recently in the United Kingdom, but it is a costly process and creates proliferation concerns.
At Principia, we have contributed to many of the activities mentioned above, as described in a previous post. And we recognize the critical role that nuclear power plays in achieving a sustainable and energy-secure future.
