ITER is a physics experiment, not dissimilar to the LHC. It is not going to generate "power" but energy. The goal is to provide a steady fusion reaction from which to then develop potential technologies to turn that energy into usable electricity. ITER is not a powerplant. It is a scientific reactor.
https://www.iter.org/proj/inafewlines
>> ITER will be the first fusion device to produce net energy. ITER will be the first fusion device to maintain fusion for long periods of time. And ITER will be the first fusion device to test the integrated technologies, materials, and physics regimes necessary for the commercial production of fusion-based electricity.