EXHIBIT
      32.1
    
    CERTIFICATION
      OF 
    CHIEF
      EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER
    PURSUANT
      TO 18 U.S.C. SECTION 1350,
    AS
      ADOPTED PURSUANT TO
    SECTION
      906 OF THE SARBANES-OXLEY ACT OF 2002
     
    In
      connection with the Quarterly Report on Form 10-Q of Pacific Ethanol, Inc.
      (the
“Company”) for the period ended March 31, 2007 (the “Report”), the undersigned
      hereby certify in their capacities as Chief Executive Officer and Acting Chief
      Financial Officer of the Company, respectively, pursuant to 18 U.S.C.
      section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act
      of
      2002, that, to their knowledge:
     
    1.    the
      Report fully complies with the requirements of Section 13(a) or 15(d) of the
      Securities Exchange Act of 1934, as amended; and
     
    2.    the
      information contained in the Report fairly presents, in all material respects,
      the financial condition and results of operations of the Company.
    
      
          
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            | Dated: May
              10, 2007 | 
            By:   | 
            /S/ NEIL
              M.
              KOEHLER  | 
          
          
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               Neil
              M. Koehler | 
          
          
            |   | 
            
               President
                and
                Chief Executive Officer 
              (Principal Executive
                Officer) 
             | 
          
      
     
    
      
        
            
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              | Dated: May
                10, 2007 | 
              By:   | 
              /S/ JOHN
                T.
                MILLER | 
            
            
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                 John
                T. Miller | 
            
            
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                 Chief Operating Officer and Acting Chief Financial
 Officer 
                (Principal Financial
                  Officer) 
               | 
            
        
       
       
     
    A
      signed
      original of this written statement required by Section 906, or other document
      authenticating, acknowledging, or otherwise adopting the signatures that appear
      in typed form within the electronic version of this written statement required
      by Section 906, has been provided to the Company and will be retained by the
      Company and furnished to the Securities and Exchange Commission or its staff
      upon request.