I made some calculations.<p>The total cost of ITER is $14 billons (and going up :) ). The total production of electricity in the word is 20000TWh&#x2F;year.<p>If we magically switch to 100% tokamak fusion production, and we want to recoup the inversion in one year, it would add 0.7 $&#x2F;MWh to the production (and distribution cost).<p>A more realistic scenario is to generate only the mythical 1% using tokamak fusion reactors, and recoup the money in 10 years. With this modification the R&amp;D cost is 7 $&#x2F;MWh.<p>Just for comparison, the current cost of electricity is 50-150 $&#x2F;MWh. So 0.7-7 $&#x2F;MWh is not too much.<p>Anyway, the ITER project is not even close to make a functional power generator, so the final cost may be much bigger than $14 billons.