Electricity Network of Serbia (EMS) is a Serbian national transmission system operator company with the headquarters in Belgrade, Serbia. They have signed a contract with Kolektor Etra for the supply of an 400/115 kV/kV auto-transformer, which will be located in the suburbs of the third largest Serbian town. The mentioned transformer will be our first one of 400/115 kV/kV delivered to our Serbian operator of the electricity network EMS.