1.   The CBAM certificates to be surrendered in accordance with Article 22 of this Regulation shall be adjusted to reflect the extent to which EU ETS allowances are allocated free of charge in accordance with Article 10a of Directive 2003/87/EC to installations producing, within the Union, the goods listed in Annex I to this Regulation.

2.   The Commission is empowered to adopt implementing acts laying down detailed rules for the calculation of the adjustment as referred to in paragraph 1 of this Article. Such detailed rules shall be elaborated by reference to the principles applied in the EU ETS for the free allocation of allowances to installations producing, within the Union, the goods listed in Annex I, taking account of the different benchmarks used in the EU ETS for free allocation with a view to combining those benchmarks into corresponding values for the goods concerned, and taking into account relevant input materials (precursors). Those implementing acts shall be adopted in accordance with the examination procedure referred to in Article 29(2).