1. The volume of allowances covered by Chapter III of Directive 2003/87/EC auctioned in individual auctions conducted by an auction platform appointed pursuant to Article 30(1) or (2) of this Regulation shall be no greater than 20 million allowances and no less than 10 million allowances; save where the total volume of allowances, covered by Chapter III of Directive 2003/87/EC, to be auctioned by the appointing Member State is less than 10 million in a given calendar year, in which case the allowances shall be auctioned in a single auction per calendar year.
2. The volume of allowances covered by Chapter II of Directive 2003/87/EC auctioned in individual auctions conducted by an auction platform appointed pursuant to Article 30(1) or (2) of this Regulation shall be no greater than 5 million allowances and no less than 2,5 million allowances; save where the total volume of allowances, covered by Chapter II of Directive 2003/87/EC, to be auctioned by the appointing Member State is less than 2,5 million in a given calendar year, in which case the allowances shall be auctioned in a single auction per calendar year.
3. The total volume of allowances covered by Chapters II and III of Directive 2003/87/EC to be auctioned by all auction platforms appointed pursuant to Article 30(1) or (2) of this Regulation collectively shall be distributed evenly over any given calendar year, except that the volume auctioned in auctions held in August of each year shall be half of the volume auctioned in other months of the year.
4. The auction platforms appointed pursuant to Article 30(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 Chapters II and III of Directive 2003/87/EC, to be auctioned in individual auctions each year, after the determination and publication pursuant to Articles 11(1) and 13(1) of this Regulation by the auction platforms appointed pursuant to Article 26(1) and (2) of this Regulation, by 31 March 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.
Published calendars referred to in the first subparagraph shall be consistent with any relevant conditions or obligations listed in Annex III.
5. Where an auction conducted by an auction platform appointed pursuant to Article 30(1) or (2) is cancelled by the auction platform pursuant to Article 7(5) or (6) or Article 9, the auctioned volume shall be distributed evenly either over the next four auctions scheduled on the same auction platform or, if the auction platform concerned conducts less than four auctions in a given calendar year, over the next two auctions scheduled on the same auction platform.