Since Turkey is located on an active tectonic belt due to its geological and geographical location, it is in a rich position among the countries of the world in terms of geothermal energy. The Balçova-Narlıdere Geothermal Field (BNGF) is located on the southern edge of Izmir Bay of the Aegean coast and is 11km far from southwest of Izmir city. This geothermal play represents the first field in Turkey used for the application of direct heating. Beginning in 1960, studies about hydrogeology, hydrochemistry, reservoir performance, temperature analysis and use of geothermal water are still going on in the Balçova-Narlıdere Geothermal field.