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Key facts of the case:

(Request for a preliminary ruling from the Kúria, Hungary)

(Internal market in natural gas –Directive 2003/55 — Directive 2009/73 — Scope ratione temporis — Locus standi of a legal person, a natural gas distribution company, to contest a decision of the national regulatory authority — National condition for locus standi based exclusively on a ‘legal interest’ — Fundamental right to effective legal protection — Article 47 of the Charter of Fundamental Rights of the European Union).