49It follows that, where, as in the case in the main proceedings, a Member State adopts measures of support for cogeneration and renewable energy sources within a framework such as that laid down, first, by Directive 2004/8, in particular Article 7, and, secondly, by Directive 2001/77, in particular Article 4, and thus implements European Union law, it must observe the principle of equal treatment and non-discrimination laid down in particular in Articles 20 and 21 of the Charter (see, to that effect, Case C‑401/11 Soukupová [2013] ECR, paragraph 28).
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