This study analyzes the best renewable energy options in Turkey's sustainable development using the IFTOPSIS method. The study aims to rank Turkey's preferences for renewable energy investments at the optimum level according to the sustainable growth constraint and determined criteria. This method gives optimum results in decision processes where the criteria and options are numerous, the available information is complex, and the degree of hesitation of decision-makers increases. The IF-TOPSIS method has been applied with seven options (wind, solar, geothermal, biomass, wave hydraulics, hydrogen) and 25 criteria to select the best renewable energy source for sustainable development in Turkey. According to the application results, the study's main finding is that the best renewable energy source for Turkey's sustainable growth is "solar energy." Another important finding is that Turkey's essential "evaluation of the criteria" for renewable energy is "capital/investment cost." (c) 2022 Published by Elsevier Ltd.