Expected to cost up to 10 billion Euros the ITER Experimental Fusion Reactor will be the first of its kind.  With the growing costs of fossil fuels and the worlds demand for clean energy, fusion power is a very promising technology.  Fusion with works by joining two hydrogen atoms into a helium atom ( basically the opposite way that current fission nuclear reactors works) which creates a tremendous amount of heat and steam which is used to power turbines.  Producing the energy that could be generated by fusion is almost impossible with fossil fuels. With just 1 kg of fuel a fusion reactor can generate more energy than a fossil fuel plant could with 10,000,000kg of fuel.   Located in Southern France, the ITER Experimental Fusion Reactor is expected to break ground in 2007, and could be operational by 2040.  Read more here