Turkey has rich thorium reserves amounting to about 380,000 tons as observed until today. Thorium reactors are under development by some countries. They are less dangerous than the classical uran reactors. In a comparison of fuels, spent thorium fuel is considerably less radiotoxic than spent uranium fuel. From the stand point of environmental protection, the thorium reactors will have a future. Turkey must develop cooperation with countries that develop thorium reactor technology. The protection of environment and conservation of energy by using new technologies and new techniques are also important aspects. Nuclear power plants must be built in Turkey.