A €10bn project to build the next generation experimental fusion reactor with 10 times the volume of Jet has been given the go-ahead and is due to be built at Cadarache in France. Today, after years of false starts and political wrangling dating from the cold war, they will get their chance to make that dream a reality. A €10bn (£7bn) project, called Iter, to build a prototype nuclear fusion reactor will be signed off in Brussels by the EU, Japan, China, South Korea, India and the US.