74.41—Identifying allowances.
        
        (a) Identifying allowances.
         Allowances allocated to an opt-in source will be assigned a serial number that identifies them as being allocated under an opt-in permit.
    
    
        
        (b) Submittal of opt-in allowances for auction.
        
        (1) 
         An authorized account representative may offer for sale in the spot auction under  § 73.70 of this chapter allowances that are allocated to opt-in sources, if the allowances have a compliance use date earlier than the year in which the spot auction is to be held and if the Administrator has completed the deductions for compliance under  § 73.35(b) for the compliance year corresponding to the compliance use date of the offered allowances.
    
    
        
        (2) 
         Authorized account representatives may not offer for sale in the advance auctions under  § 73.70 of this chapter allowances allocated to opt-in sources.