112It should be noted in this regard that even though, in the context of State aid control, the Member State must, in accordance with the duty to cooperate in good faith laid down in Article 4(3) TEU, provide the Commission with the information that will allow it to take a decision on whether the measure at issue contains State aid, the Commission is under an obligation to conduct a diligent and impartial examination (see paragraph 95 above) and to conduct a careful examination of the information which the Member State provides to it (judgment of 30 April 2014 in Dunamenti Erőmű v Commission, T‑179/09, EU:T:2014:236, paragraph 176). In keeping with the intention of the formal investigation procedure, which makes the interested parties the Commission’s source of information (see, to that effect, judgment of 31 May 2006 in Kuwait Petroleum (Nederland) v Commission, T‑354/99, ECR, EU:T:2006:137, paragraph 89), that obligation also applies to the Commission in respect of information communicated to it by the interested parties.
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