How Nuclear Energy Works: Fission, Baseload Power, and the Shift to Small Modular Reactors

Nuclear energy generates electricity through fission, splitting uranium fuel rods to produce heat that boils water into steam. That steam spins a turbine connected to a generator. The process is similar to coal or gas plants, but the heat source is nuclear rather than combustion. The result is large scale baseload power with near zero carbon emissions during operation. Countries use nuclear for its reliability. Unlike solar or wind, nuclear plants run continuously regardless of weather. But the tradeoffs are real: construction takes years and costs billions, and spent fuel needs long term storage. The industry is now pushing small modular reactors (SMRs) that can be built faster and in sections, plus advanced designs that aim for higher efficiency and less waste. These technologies are still in development but could reshape how nuclear fits into a decarbonized grid.