Case T-169/08 RENV: Judgment of the General Court of 15 December 2016 — DEI v Commission (Competition — Abuse of a dominant position — Greek market for the supply of lignite and Greek wholesale electricity market — Decision finding an infringement of Article 86(1) EC, read in combination with Article 82 EC — Grant or maintenance of exploitation rights for public deposits of lignite in favour of a public undertaking — Definition of the markets at issue — Existence of unequal opportunities — Obligation to state reasons — Legitimate expectations — Misuse of powers — Proportionality)