Judgment of the Court (Fourth Chamber) of 22 February 2024.#Mytilinaios AE – Omilos Epicheiriseon v Dimosia Epicheirisi Ilektrismou AE (DEI) and European Commission and European Commission v Dimosia Epicheirisi Ilektrismou AE (DEI).#Appeal – State aid – Article 107 TFEU – Concept of ‘aid’ – Advantage – Private investor test – Arbitration award setting reduced electricity tariffs – Whether the arbitration award can be imputed to the State – Regulation (EU) 2015/1589 – Article 4(2) – Decision that the measure does not constitute aid.#Joined Cases C-701/21 P and C-739/21 P.