Greece

• Public Gas Company of Greece (DEPA)
• Hellenic Petroleum
• Motor Oil Hellas Refineries
• Kavala Oil Refineries
• Public Power Company of Greece
• Shell Hellas
• Gas Distribution Company of Athens (Shell, Sinergy)
• Gas Distribution Company of Thessaloniki (Italgas)
• Gas Distribution Company of Thessalia (Italgas)

International

• Turkish National Gas & Oil Co. (BOTAS)
• Istanbul gas Distribution Co. (IGDAS)
• Nis/Energogaz
• Pakistan Oilfields Ltd
• Mari Gas Co Ltd
• OMV Indoil
• Bursa Gaz
• Izmir Gaz
• Khorasan Petrochemicals
• Fanavaran Petrochemical Co.
• Egypt Gas
• Akfel
• Flonidan
• RMG