The principal obstacle to the development of magnetic fusion energy as a commercialelectric power is the cost of the first devices. The potential impart of various "advanced tokamak"operating modes on power plant prospects has been studied. Several different classes of tokamakreactors are considered and the designs are optimized in term of cost of electricity (COE) via acoupled physics/engineering/costing code. The result has shown the prices of electricity is 70-130mill/kWh and higher than those of coal an...