1. The auction platforms appointed pursuant to Article 26(1) or (2) of this Regulation shall determine and publish the bidding windows, individual volumes, auction dates as well as the auctioned product, payment and delivery dates of the allowances covered by Chapter III of Directive 2003/87/EC to be auctioned in individual auctions each calendar year, by 28 February of the previous year, or as soon as practicable thereafter, having previously consulted the Commission and obtained its opinion thereon. The auction platforms concerned shall take the utmost account of the Commission's opinion.
2. The auction platforms appointed pursuant to Article 26(1) or (2) of this Regulation shall base their determinations and publications under paragraph 1 of this Article on the Commission's determination and publication of the estimated amount of allowances to be auctioned or on the most recent amendment of the Commission's original estimate referred to in Article 10(1) of Directive 2003/87/EC.
3. The bidding windows, individual volumes and auction dates of the allowances covered by Chapter III of Directive 2003/87/EC to be auctioned in individual auctions for the final year of each trading period, may be adjusted by the auction platform concerned to take account of any cessation of operations of an installation pursuant to Article 10a(19) of that Directive, any adaptation of the level of free allocation pursuant to Article 10a(20) of that Directive or allowances remaining in the reserve for new entrants provided for in Article 10a(7) of that Directive.
4. The calendar for individual auctions of allowances covered by Chapter III of Directive 2003/87/EC conducted by an auction platform other than the auction platforms appointed pursuant to Article 26(1) or (2) of this Regulation shall be determined and published pursuant to Article 32 of this Regulation.