Nuclear fusion is an attractive long-term energy solution, although it is unlikelythat the technology will be ready for commercial power generation in the near future. Nevertheless, fusion energy has made significant progress over the last few decades and is now considered as a credible option for clean, large-scale electricity generation. Fusion is the process that produces the light and heat of the sun. Hydrogen nuclei collide in the sun’s core and release huge amounts of energy as theyfuse into helium atoms. On earth, fusion reactors heat gas to extreme temperatures to produce a plasma similar to the conditions found within a star. Fusion’s many benefits include an essentially unlimited supply of fuel, passive intrinsic safety and no production of CO2 or atmospheric pollutants. It is one of the very few candidates for the large-scale, carbon-free production of base-load power. Compared to nuclear fission, it produces relatively short-lived radioactive products, with half-lives limited to less than 50 years.