„AURUBIS Bulgaria” AD, Pirdop
CPPE Carbon Process & Plant Engineering S.A., Luxembourg
„VEGA –Vurbenov” OOD, Sofia
“MP-Metalplast”AD, Pirdop
„KCM” AD, Plovdiv
„Alstom- Bilgaria” EOOD
ТРР„AES 3C Maritza East 1 EOOD”, Galabovo
“TPP Maritsa East 2” EAD
„Enel Produzione” SpA, Italy
ТРР “ConturGlobal Maritsa East 3” AD, Mednikarovo village
TPP „Bobov dol” EAD
TPP „Belhatov “ – Poland
„Kurotec-KTS”, Poland
Dundee Precious Metals Chelopech EAD, Chelopech village
“Chelopech Mining” EAD, Chelopech village
WWTP „Almagest” AD Sofia
”Vinprom Karnobat”
WTP „Vinsindustrys”, „Envirochemie” GmbH, Germany
WWTP „Fazerles”, Silistra, “Envirochemie”GmbH, Germany
„Envirochemie”, Germany
„Diana commerce 1” EOOD
STRABAG EAD
Kamenitza AD
GLOBAL WATER ENGINEERING GmbH, Germany
“ ISA 2000” EOOD Sofia
„Kurotec-KTS”, Germany
CBMI Construction Company LTD.- branch in Bulgaria, China