Judgment of the Court (Second Chamber) of 15 May 2025.#Metsä Fibre Oy.#Request for a preliminary ruling from the Helsingin hallinto-oikeus.#Reference for a preliminary ruling – Scheme for greenhouse gas emission allowance trading – Union Registry – Regulation (EU) No 389/2013 – Record of a surrender of such allowances in that registry – Finality of transactions – Article 40 – Reversal of finalised processes – Article 70 – Surrender under a provision of EU law subsequently invalidated by the Court of Justice – Impossibility, for the operator, to recover the allowances concerned for the period in question