By way of derogation from Article 10c, the Member States concerned may only give transitional free allocation to installations in accordance with that Article for investments carried out until 31 December 2024. Any allowances available to the Member States concerned in accordance with Article 10c for the period from 2021 to 2030 that are not used for such investments shall, in the proportion determined by the respective Member State:

(a) be added to the total quantity of allowances that the Member State concerned is to auction pursuant to Article 10(2); or

(b) be used to support investments within the framework of the Modernisation Fund referred to in Article 10d, in accordance with the rules applicable to the revenue from allowances referred to in Article 10d(4).

By 15 May 2024, the Member State concerned shall notify the Commission of the respective amounts of allowances to be used under Article 10(2), first subparagraph, point (a), and, by way of derogation from Article 10d(4), second sentence, under Article 10d.