In this study, the Euphrates river basin in a sequential manner established a scenario modeled after Turkey's three largest hydropower plant was established. In this scenario, according to the needs of the interconnected system, the lake levels of these three dams were kept at the highest possible level and energy was produced. In this way, the maximum level of water, which means energy, is kept and the turbine-generator units are operated at the highest possible efficiency and electricity is produced. The demand for electricity, the minimum and maximum water required in the dams, were handled as turbid. Then, for the determined scenario, the energy required by the interconnected system from these dams is determined from which dam and how many units will work for how long.