What happens to the rest of Clean Energy Startups?Nothing has ever been attempted on the scale of Iter. The world record for fusion power – 16MW - was set in 1997 at the JET reactor in the UK. The longest fusion run – six minutes and 30 seconds – was achieved at France’s Tore Supra in 2003. Iter is aiming for 500MW and 50-minute runs The site is a cathedral to the fusion dream: it spans the equivalent of 60 football fields and the reactor building will weigh 320,000 tonnes, all resting on rubber bearings in case of an unlikely, but not impossible, earthquake. The reactor itself will weigh 23,000 tonnes, three times more than the Eiffel Tower. It is the most complex engineering project in history.