Case C-332/18 P: Judgment of the Court (Eighth Chamber) of 11 December 2019 — Mytilinaios Anonymos Etairia — Omilos Epicheiriseon, formerly Alouminion tis Ellados VEAE v European Commission, Dimosia Epicheirisi Ilektrismou AE (DEI) (Appeal — State aid — Production of aluminium — Preferential electricity supply tariff granted by a contract — Decision declaring the aid compatible with the internal market — Termination of the contract — Judicial suspension, as an interim measure, of the effects of termination — Decision declaring the aid unlawful)