• PUC “Beogradske elektrane” Belgrade
• PUC “Beogradski vodovod i kanalizacija”
• Elektroprivreda Srbije (Electric Power Industry of Serbia):

– Branch TE-KO Kostolac – Branch RB Kolubara – Branch TENT – Branch HE Đerdap

– Branch Drinsko-Limske HE – Branch Panonske TE

• Serbia Zijin Copper doo

– Branch RBB – Branch TIR – Branch RBM

• NIS AD Novi Sad
• JP Srbijagas Novi Sad
• HIP Petrohemija d.o.o.
• Oil Refinery Pančevo
• HBIS GROUP Iron&Steel doo Beograd (Železara Smederevo)
• PUC City Transport Company GSP Belgrade
• JKP Gornji Milanovac
• Energetika d.o.o. Kragujevac
• PUC “Grejanje” Pančevo
• PUC Toplana Bor
• PUC City Heating Plant Kruševac
• PUC City Heating Plant Niš