- Armenian Ministry Of Energy
- Athens Water And Sewerage Company (EYDAP)
- Centru Electricity Distribution Company Of Moldova
- Chisinau Electricity Distribution Company Of Moldova
- Cyprus Energy Regulatory Authority (CERA)
- EBRD
- Electrabel
- Electroprivreda (Montenegro)
- Electrostopanstvo (FYROM)
- Elektroprivreda Of Bosnia And Herzegovina
- European Commission
- European Energy and Telecom Consultancy
- Gas Distribution Company of the Athens wider region (EPA Attikis)
- Georgian Government
- Gorno Oriahovitsa Electricity Distribution Company Of Bulgaria
- Greek Gas Supply And Transmission Company (DEPA)
- Greek Government
- Greek Regulatory Authority For Energy (RAE)
- Gurgulesti Oil Port Terminal (Moldova)
- Hellenic Petroleum (ELPE)
- Hellenic Transmission System Operator (DESMIE)
- Kievoblenergo of Ukraine
- Kosovo Electricity Company (KEK)
- Ministry Of Development Greece
- Montenegro Energy Regulatory Agency (ERA)
- Nord Electricity Distribution Company Of Moldova
- Nord Vest Electricity Distribution Company Of Moldova
- PETROLA Refinery (now Hellenic Petroleum unit)
- Pleven Electricity Distribution Company Of Bulgaria
- Plovdiv Electricity Distribution Company Of Bulgaria
- Polish Government
- Public Power Corporation Of Greece (ΔΕΗ)
- Sakenergo (Georgia)
- Serbian Energy Efficiency Agency (SEEA)
- Sofia Electricity Distribution Company Of Bulgaria
- Stara Zagora Electricity Distribution Company Of Bulgaria
- Stolichno Electricity Distribution Company Of Bulgaria
- Sud Electricity Distribution Company Of Moldova
- Syrian Electricity Distribution Establishment (PEDEEE)
- Syrian Electricity Generation And Transmission Establishment (PEEGT)
- Thessaloniki Water And Sewerage Company (EYATH)
- Transelectrica Of Romania
- USAID
- Ukrtransnafta Of Ukraine
- Varnaelectricity Distribution Company Of Bulgaria
- World Bank
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