The shareholders of Coordinated Auction Office in South East Europe are eight Transmission System Operators from the South East European region:

Croatia |
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HOPS | Croatian Transmission System Operator Plc. |
Bosnia and Herzegovina |
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NOSBiH | Nezavisni operator sistema u Bosni i Hercegovini |
Montenegro |
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CGES | Crnogorski elektroprenosni sistem AD |
Albania |
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OST | Operatori i Sistemit te Transmetimit |
Kosovo |
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KOSTT | Operator sistemi, transmisioni dhe tregu Sh.A. |
Greece |
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IPTO | Independent Power Transmission Operator S.A. |
Türkiye |
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TEIAS | Türkiye Elektrik İletim A.Ş. |
North Macedonia |
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MEPSO | Оператор на електропреносниот систем на Република Северна Македонија |