Recently, with the global administrative crises of the countries, energy has emerged as a very important need. In addition, this need is increasing as the interest in renewable energy to replace fossil fuels and the problems caused by climate change become more serious. Small Hydroelectric Power Plants (SHP) are considered an energy source with high development value due to their high energy density compared to other renewable energy sources. Generally, the hydroelectric potential is estimated based on the discharge in the river basin and the discharge is obtained with the stations in the basin. However, if there are no stations or insufficient discharge data, the discharge is estimated based on precipitation data. In the literature, Hydropower potential calculations are based on very simple, clear formulations that do not distinguish between different states. In this study, Sevay, Merga, and Rapka Streams located in the sub-basin of the Euphrates-Tigris Basin were chosen as the study area. Hypsographic Curve (HC) and Energy Index (EI) methods were used to determine the hydropower potential. When the results are evaluated, it shows that the methods used to give numerical values and determine linguistically rational and logical rules for the hydropower potential of a drainage basin. In the sub-basins, the EI values range from 0.11 to 1.0, corresponding to the “Very High” and “Low” categories, respectively. In addition, considering the hydropower potential results, it is thought that it will support rural development and contribute to the country's economy.