42It follows that the use by an entity, such as the one in question in the main proceedings, of a portion of the electricity that it produces for the purpose of generating electricity, whilst constituting a chargeable event for tax under the first and third subparagraphs of Article 21(5) of Directive 2003/96, must be exempted from tax under Article 14(1)(a) of that directive. Any other interpretation would undermine the objectives pursued by that directive, as referred to in paragraphs 34 and 35 of this judgment. First, the electricity thus produced would necessarily be subject to double taxation. Secondly, it could lead to unequal treatment between entities such as the one in question in the main proceedings and other electricity producers using energy products and electricity supplied by third parties for the purpose of their own production, which would be a source of distortions of competition (see, to that effect, judgment of 7 March 2018, Cristal Union, C‑31/17, EU:C:2018:168, paragraph 33).
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