35However, in accordance with settled case-law, in the absence of European Union rules in the area, it is for the domestic legal system of each Member State, in particular, to designate the authorities responsible and to lay down detailed procedural rules for safeguarding rights which individuals derive from European Union law, provided that such rules are not less favourable than those governing similar domestic actions (principle of equivalence) and that they do not render impossible in practice or excessively difficult the exercise of rights conferred by the European Union legal order (principle of effectiveness) (see, inter alia, Case C-228/96 Aprile [1998] ECR I-7141, paragraph 18, and Case C-472/08 Alstom Power Hydro [2010] ECR I-623, paragraph 17).
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