ex10-1_4.htm


    


     

    Exhibit
      10.1.4

     

    [On
      Aquila, Inc. Letterhead]

     

    


     

                    August
      31,
      2007

    
      	
              Steven
                Helmers, Esq.

            	
              Mark
                English, Esq.

            
	
              Black
                Hills Corporation

            	
              Great
                Plains Energy Incorporated

            
	
              625
                Ninth Street

            	
              1201
                Walnut

            
	
              Rapid
                City, SD 57709

            	
              Kansas
                City, MO 64106

            


    

    


    
      	
              Re:

            	
              Partnership
                Interests Purchase Agreement and Asset Purchase Agreement (collectively,
                the "Agreements") by and among Aquila, Inc. ("Aquila"), Black Hills
                Corporation ("Black Hills"), Great Plains Energy Incorporated ("Great
                Plains") and Gregory Acquisition Corp.
                ("Gregory")

            


    

     

    Dear
      Steve and Mark:

     

    Under
      the
      terms of the Agreements, as modified by that certain letter dated as of June
      29,
      2007, Black Hills and Great Plains are to attach schedules setting forth
      Retained Agreements and Shared Agreements prior to September 1, 2007. We
      recognize that this deadline may be implausible and therefore propose extending
      the date set forth under section 2.2(1) and 8.5(d) of the Agreements to October
      1, 2007. Of course we will work to assist you in the identification
      process.

    


    If
      you
      are in agreement, please sign below on the attached signature page where
      indicated and return a copy of this letter to me by fax or e-mail.

    


    


    Very
      truly yours,

    


    AQUILA,
      INC.

    


    
      	 	
              By:           /s/
                Christopher M. Reitz

            
	 	 
	 	
              Name:  Christopher
                M. Reitz

            
	 	
              Title:                      General
                Counse

            


    

     

     

    l


    
      
        

      



     

    
       

       

    

     

    Signature
      Page to August 31, 2007 Letter Agreement

    


    


    ACKNOWLEDGED,
      CONSENTED TO, AND ACCEPTED BY:

    


    BLACK
      HILLS CORPORATION

    


    By:           /s/
      Steven J. Helmers

    


    Name:      Steven
      J. Helmers

    Title:        General
      Counsel

    


    


    GREAT
      PLAINS ENERGY INCORPORATED

    


    By:           /s/
      Terry Bassham

    


    Name:    
      Terry Bassham

    
      	
               

            	
              Title:     
                Executive Vice President – Finance and Strategic Development and
                CFO

            


    

    


    


    GREGORY
      ACQUISITION CORP.

    


    By:           /s/
      Mark G. English

    


    Name:    
      Mark G. English

    Title:      
      Secretary and Treasurer

     

     

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