http://www.legislation.gov.uk/uksi/2021/484/regulation/5The Greenhouse Gas Emissions Trading Scheme Auctioning Regulations 2021texttext/xmlenCLIMATE CHANGEStatute Law Database2026-05-22Expert Participation2026-04-08 These Regulations make provision under the Finance Act 2020 for auctions of allowances to emit 1 tonne of carbon dioxide equivalent created under the Greenhouse Gas Emissions Trading Scheme Order 2020. PART 2 Auction DesignSubmission and withdrawal of bids51The minimum volume bid is one lot, and each lot auctioned must consist of 500 allowances.2Each bid must state—athe identity of the bidder and whether the bidder is bidding on its own account or on behalf of a client;bwhere the bidder is bidding on behalf of a client, the identity of the client;cthe volume bid as a number of allowances in integral multiples of lots of 500 allowances;dthe price bid in pounds sterling for each allowance specified to two decimal points.3Subject to paragraph (4), each bid may only be submitted, modified or withdrawn during the bidding window set by the auction platform.4Bids submitted may be modified or withdrawn by a deadline before the close of the bidding window set by the appointed auction platform and published on that auction platform's website at least five trading days before the day on which the bidding window opens.5Only a natural person ... appointed pursuant to regulation 17(2)(d) and authorised to bind a bidder for all purposes relating to the auctions including the submission of a bid (the ‘bidder's representative’) is entitled to submit, modify or withdraw a bid on behalf of a bidder.6Once submitted, each bid is binding, unless it is withdrawn or modified pursuant to paragraph (3) or (4), or withdrawn pursuant to paragraph (7).7Where the appointed auction platform is satisfied that a genuine mistake has been made in the submission of a bid, it may, upon request of the bidder's representative, treat the mistakenly submitted bid as withdrawn after the close of the bidding window, but before the auction clearing price has been determined.8The reception, transmission and submission of a bid by an investment firm or credit institution on any auction platform is to be treated as an investment service within the meaning of Article 2(1)(2) of the Markets in Financial Instruments Regulation.9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Reg. 5 in force at 22.4.2021, see reg. 1(2)Reg. 5(9) omitted (19.5.2021) by virtue of The Greenhouse Gas Emissions Trading Scheme Auctioning (Amendment) Regulations 2021 (S.I. 2021/561), regs. 1(2), 2(3)(b)Words in reg. 5(5) omitted (19.5.2021) by virtue of The Greenhouse Gas Emissions Trading Scheme Auctioning (Amendment) Regulations 2021 (S.I. 2021/561), regs. 1(2), 2(3)(a)