48In addition, the onus is on the Commission to exercise particular vigilance in examining the links between companies belonging to the same group where there are grounds to fear the effects on competition of an accumulation of State aid within the same group (see, to that effect, judgment of 8 September 2009, AceaElectrabel v Commission, T‑303/05, not published, EU:T:2009:312, paragraph 116).
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