International project for the world’s largest tokamak being built in Cadarache, France. China, the EU, India, Japan, Korea, Russia, and the USA are involved in the construction. When completed, the tokamak should have a plasma volume of 840 m³ and generate 500 MW of thermal energy, about ten times the energy needed to sustain fusion. The first plasma is expected in 2026. Knowledge gained from experiments on ITER should provide enough data for the first demonstration thermonuclear power plant to be built and generate electricity.