43The concepts of distribution system and transmission system are not defined as such in Directive 2009/72. However, Article 2(3) of the directive defines the concept of ‘transmission’ as the transport of electricity on the extra high-voltage and high-voltage interconnected system with a view to its delivery to final customers or to distributors, but excludes ‘supply’ itself. Article 2(5) of the directive, for its part, defines the concept of ‘distribution’ as the transport of electricity on high-voltage, medium-voltage and low-voltage distribution systems with a view to its delivery to customers, but excludes ‘supply’ itself. The concept of ‘supply’ must be understood, according to Article 2(19) of the directive, as meaning the sale of electricity to customers (see, by analogy, judgment of 22 May 2008, citiworks, C‑439/06, EU:C:2008:298, paragraph 45, and, to that effect, judgment of 28 November 2018, Solvay Chimica Italia and Others, C‑262/17, C‑263/17 and C‑273/17, EU:C:2018:961, paragraph 28).
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