In the rating and design of the geothermal energy systems for district energy systems the technology, cost, benefits and environmental effects of the alternatives need to be carefully compared. This study deals with the evaluation of several alternatives of district energy systems for the city of Denizli. These alternatives vary from the existing geothermal plant to the hybrid cycle/totally integrated geothermal energy system. In the comparative evaluation of the alternative projects, Analytical Hierarchy Process (AHP) was utilized.Units: SI