17In that regard, the need to provide an interpretation of EU law which will be of use to the national court means that that court must define the factual and legislative context of the questions which it is asking or, at the very least, explain the factual circumstances on which those questions are based. The Court is empowered to rule on the interpretation or validity of EU provisions only on the basis of the facts which the national court puts before it (order of 21 June 2018, Idroenergia, C‑166/18, not published, EU:C:2018:476, paragraph 12 and the case-law cited).
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