Judgment of the Court (Fifth Chamber) of 7 November 2019.#Asociación Española de la Industria Eléctrica (UNESA) and Others v Administración General del Estado and Others.#Requests for a preliminary ruling from the Tribunal Supremo.#Reference for a preliminary ruling — Polluter-pays principle — Common rules for the internal market in electricity — Directive 2009/72/EC — Article 3(1) and (2) — Principle of non-discrimination — Financing the tariff deficit — Taxes applying only to undertakings which use nuclear energy to produce electricity.#Joined Cases C-80/18 to C-83/18.