40In the second place, as regards the Commission’s argument concerning the application of the case-law established in the judgments of 25 October 2007 in SP and Others v Commission (T‑27/03, T‑46/03, T‑58/03, T‑79/03, T‑80/03, T‑97/03 and T‑98/03, EU:T:2007:317) and 29 March 2011 in ArcelorMittal Luxembourg v Commission and Commission v ArcelorMittal Luxembourg and Others (C‑201/09 P and C‑216/09 P, EU:C:2011:190), it follows from that case-law that, although it is necessary — in order to comply with the principles governing the temporal application of the law and because of the requirements relating to the principles of legal certainty and the protection of legitimate expectations — to apply the substantive rules in force at the date of the facts in issue even if those rules are no longer in force when an EU institution adopts an act, the provision which forms the legal basis of an act and empowers the EU institution to adopt the act in question must, by contrast, be in force when the act is adopted. Similarly, the procedure for adopting that act must be carried out in accordance with the rules in force at the time of adoption.
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