96.24—Effective date of initial NO X Budget permit.
         The initial NOX Budget permit covering a NOX Budget unit for which a complete NOX Budget permit application is timely submitted under  § 96.21(b) shall become effective by the later of:
    
    
    
        
        (b) 
         May 1 of the year in which the NOX Budget unit commences operation, if the unit commences operation on or before May 1 of that year;
    
    
        
        (c) 
         The date on which the NOX Budget unit commences operation, if the unit commences operation during a control period; or
    
    
        
        (d) 
         May 1 of the year following the year in which the NOX Budget unit commences operation, if the unit commences operation on or after October 1 of the year.