33It follows from the very wording of Article 106 TFEU that the public service obligations which Article 3(2) of Directive 2003/55 allows to be imposed on undertakings must comply with the principle of proportionality and that, therefore, after 1 July 2007, those obligations may compromise the freedom to determine the price for the supply of natural gas only in so far as is necessary to achieve the objective in the general economic interest which they pursue and, consequently, for a period that is necessarily limited in time.
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