149In particular, according to the case-law relating to Directive 2003/55/EC of the European Parliament and of the Council of 26 June 2003 concerning common rules for the internal market in natural gas and repealing Directive 98/30/EC (OJ 2003 L 176, p. 57), which displays many similarities with Directive 2003/54, adopted on the same day, establishing the internal electricity market, it follows from the very wording of Article 106 TFEU that the public service obligations which may be imposed on undertakings under Article 3(2) of Directive 2003/55 (comparable to Article 3(2) of Directive 2003/54) must comply with the principle of proportionality and that, therefore, 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 (judgment in Federutility and Others, cited in paragraph 132 above, EU:C:2010:205, paragraph 33).
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