  Turkey is located on the seismically active Alpine-Himalayan belt. Although
tectonic activity causes seismicity in the Anatolian plate, it also constitutes
an important geothermal energy resource. Today, geothermal energy production is
heavily concentrated in Turkey's Western Anatolia region. Graben systems in
this region are very suitable for geothermal resources. The B\"uy\"uk Menderes
Graben (BMG) is an area of complex geology with active tectonics and high
geothermal potential power. Germencik (Aydin) is located in the BMG, where the
geothermal waters include mainly Na-Cl-HCO3 water types. This study examined
the stibnite scaling formed in the preheater system of the Germencik Geothermal
Field (GGF). The formation of the stibnite scaling on the preheater system
dramatically reduces the energy harvesting of the GGF. Considering the stibnite
scaling in the surface equipment, the optimum reinjection temperature was
determined as 95 $^\circ$C to prevent stibnite scaling in the GGF.
