Judgment of the General Court (Sixth Chamber, Extended Composition) of 12 November 2025.#Dimosia Epicheirisi Ilektrismou AE (DEI) v European Commission.#State aid – Electricity supply tariff – Conclusion of an arbitration agreement in order to fix the tariff – Decision to close the complaint – Decision finding no aid – Right to be heard – Advantage – Private investor test – Complex economic assessment.#Joined Cases T-639/14 RENV II, T-352/15 RENV and T-740/17 RENV.