42In those circumstances, in the absence of EU rules concerning the procedural requirements attaching to the submission and examination of an application for free allocation of emission allowances, it is, according to established case-law, for the domestic legal system of each Member State to determine those requirements in accordance with the principle of procedural autonomy provided, however, that those requirements are not less favourable than those governing similar domestic situations (principle of equivalence) and that they do not render impossible in practice or excessively difficult the exercise of rights conferred by the EU legal order (principle of effectiveness) (see, to that effect, inter alia, judgment of 20 October 2016, Danqua, C‑429/15, EU:C:2016:789, paragraph 29).
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