57Finally, the Kingdom of Belgium relies on respect for the effectiveness of Directives 2009/72 and 2009/73. Its arguments are based primarily on the fact that, pursuant to the certification decisions taken by the CREG under Regulation No 714/2009 and Regulation (EC) No 715/2009 of the European Parliament and of the Council of 13 July 2009 on conditions for access to the natural gas transmission networks and repealing Regulation (EC) No 1775/2005 (OJ 2009 L 211, p. 36), Elia System Operator and Fluxys Belgium, respectively the electricity and natural gas transmission system operators, are network owners within the meaning of Directives 2009/72 and 2009/73. However, notwithstanding the binding nature of those decisions taken by the CREG, it is settled case-law that the fact that national law is implemented in accordance with the provisions of a directive by the administrative authorities of a Member State cannot, in itself, provide the clarity and precision necessary to satisfy the requirements of legal certainty and that mere administrative practices, which by their nature are alterable at will by the authorities, cannot be regarded as constituting fulfilment of the obligations owed by the Member States in the context of transposition of a directive (judgment of 15 March 2012, Commission v Poland, C‑46/11, not published, EU:C:2012:146, paragraph 28 and the case-law cited).
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