46It follows, first of all, that, with regard to the nature of transmission and distribution systems within the meaning of Directive 2009/72 and the quantity of electricity transported on those systems, the sole relevant distinguishing criterion for determining whether a system is a transmission system or a distribution system within the meaning of that directive is the voltage of the electricity transported on those systems (see, by analogy, judgment of 22 May 2008, citiworks, C‑439/06, EU:C:2008:298, paragraph 48, and of 28 November 2018, Solvay Chimica Italia and Others, C‑262/17, C‑263/17 and C‑273/17, EU:C:2018:961, paragraph 30).
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