Judgment of the Court (Tenth Chamber) of 21 December 2021.#Vítkovice Steel a.s. v Ministerstvo životního prostředí.#Request for a preliminary ruling from the Městský soud v Praze.#Reference for a preliminary ruling – Scheme for greenhouse gas emission allowance trading – Directive 2003/87/EC – Article 11(3) – Decision 2011/278/EU – Article 3(b) and Article 10(2)(a) – Product benchmark sub-installation – Decision 2013/448/EU – Validity – Installation using a basic oxygen furnace – Hot metal – Input from a third-party installation – Refusal to allocate emission allowances – Admissibility – Failure by the applicant in the main proceedings to bring an action for annulment.#Case C-524/20.