http://en.wikipedia.org/wiki/ITER#Criticism
ITER is designed to produce approximately 500 MW of fusion power sustained for up to 1,000 seconds[13]
You have to consider that the net power is only 90%. That is a total energy of 450 GJ. It is the equivalent of a ten kg jerry can of gasoline.
ITER was originally expected to cost approximately €5billion, but the rising price of raw materials and changes to the initial design have seen that amount more than triple to €16billion.[10]
€1.6bn for the equivalent of one kg petrol seems a bit steep.
Rebecca Harms, Green/EFA member of the European Parliament's Committee on Industry, Research and Energy, said: "In the next 50 years nuclear fusion will neither tackle climate change nor guarantee the security of our energy supply." Arguing that the EU's energy research should be focused elsewhere, she said: "The Green/EFA group demands that these funds be spent instead on energy research that is relevant to the future. A major focus should now be put on renewable sources of energy." French Green party lawmaker Noël Mamère claims that more concrete efforts to fight present-day global warming will be neglected as a result of ITER: "This is not good news for the fight against the greenhouse effect because we're going to put ten billion euros towards a project that has a term of 30-50 years when we're not even sure it will be effective."[35]
For €16bn you can install off shore wind power of 7.3 GW name plate capacity at the current rates. This capacity will result in a net capacity of 2.9 GW after elimination of low and high wind periods. The wind array will have 6.4 times the power of ITER. ITER will run for 15 minutes. The wind array will run at least 25 years. The wind array will produce 5.6 million times the energy produced by ITER. I think that the above criticism is justified.
People may say that you can run ITER several times. I do not know about that. How good is an electric power source that collapses every 15 minutes? And how often can you fire it up again. I suspect that the benefits for the real power supply in our times or the time of our children will be insignificant.