Judgment of the Court (Grand Chamber) of 22 September 2020.#Republic of Austria v European Commission.#Appeal – State aid – Article 107(3)(c) TFEU – Articles 11 and 194 TFEU – Article 1, Article 2(c) and Article 106a(3) of the Euratom Treaty – Planned aid for Hinkley Point C nuclear power station (United Kingdom) – Decision declaring the aid compatible with the internal market – Objective of common interest – Environmental objectives of the European Union – Principle of protection of the environment, ‘polluter pays’ principle, precautionary principle and principle of sustainability – Determination of the economic activity concerned – Market failure – Proportionality of the aid – Operating or investment aid – Determination of the aid elements – Guarantee Notice.#Case C-594/18 P.