The world's greatest tokamak, the International Thermonuclear Experimental Reactor ITER, is being built in Cadarache, France. It is supposed to generate 500 MW and release ten times more energy than will be needed for plasma heating and confinement. The ITER is a joint project of China, the EU, India, Japan, Korea, Russia, and the USA. The device has a plasma volume of 840 m³ and toroidal magnetic coils 17 meters high. It will test tritium breeding along with a number of other technologies. 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.