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       NiSource Inc.
  
                
               NiSource Inc., a Delaware corporation (“NiSource” or the “Company”) hereby offers to purchase for cash upon the terms and subject to the conditions set forth in this Offer 
               to Purchase (as defined herein) and the Notice of Guaranteed Delivery (as defined herein) the outstanding debt securities listed below
             
              
        
          
         
         Offers to Purchase for Cash
Any and All of the Outstanding Securities Listed Below
                 
         
          
                  
                     
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                                  Principal Amount Outstanding  
                                   
                                  
                                   
                           
                       |    
                       
                          
                              
                                  U.S. Treasury Reference Security 
                                  
                                   
                           
                       |                                                       
                   
                                        
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                              4.45% Notes due 2021
                          
                          
  
                       |                       
                      
                           
                               
                              65473QAY9 / US65473QAY98
                              
 
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                               $63,552,000 
 
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                               0.125% U.S. Treasury due 7/31/2022
                                 
                       |                                                                   
                       
                                        
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                              2.650% Notes due 2022
  
                       |                       
                      
                           
                               
                              65473QBH5 /
US65473QBH56
 
                              
                              
 
                       |  
                      
                           
                               $500,000,000 
                       |    
                      
                           
                               0.125% U.S. Treasury due 7/31/2022    
                       |                                                                   
                     
                                        
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                              3.85% Notes due 2023
                          
                          
  
                       |                       
                      
                           
                               
                              65473QBA0 / US65473QBA04
 
                              
                              
 
                       |  
                      
                           
                               $250,000,000 
 
                       |    
                      
                           
                               0.125% U.S. Treasury due 7/15/2023
                                 
                       |                                                                   
                     
                                        
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                              3.650% Notes due 2023
                          
                          
  
                       |                       
                      
                           
                               
                              65473PAF2 / US65473PAF27
 
                              
                              
 
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                               $350,000,000  
                       |    
                      
                           
                               0.125% U.S. Treasury due 7/15/2023
                                 
                       |                                                                   
                                                                                                                                   
                 
                
         
               And 
                    Up to the Aggregate Maximum Repurchase Amount(a) 
of the Outstanding Securities Listed Below
 
                 
         
          
                  
                     
                      | 
                          
                       | 
                      
                          
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                                  Principal Amount Outstanding  
                                   
                                   
                           
                       |  
                      
                          
                              
                                  Acceptance Priority Level(a)  
                                   
                                   
                           
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                                  U.S. Treasury Reference Security 
                                  
                                   
                           
                       |                                                       
                   
                                        
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                              6.25% Notes due 2040
                          
                          
  
                       |                       
                      
                           
                               
                              65473QAW3/US65473QAW33
                              
 
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                               $250,000,000 
 
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                               1 
 
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                               2.00% U.S. Treasury due 2/15/2020
                                 
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                              5.95% Notes due 2041
  
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                              65473QAX1/US65473QAX16
 
                              
                               
                       |  
                      
                           
                               $400,000,000 
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                               2 
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                               2.00% U.S. Treasury due 2/15/2020    
                       |                                                                   
                     
                                        
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                              5.80% Notes due 2042
                          
                          
  
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                              65473QAZ6 / US65473QAZ63
 
                              
                              
 
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                               $250,000,000  
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                               3  
                       |    
                      
                           
                               2.00% U.S. Treasury due 2/15/2020
                                 
                       |                                                                   
                     
                                        
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                              5.65% Notes due 2045
                          
                          
  
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                              65473QBD4 / US65473QBD43
 
                              
                               
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                               $500,000,000  
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                               4  
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                               2.00% U.S. Treasury due 2/15/2020
                                 
                       |                                                                   
                   
                                        
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                              5.25% Notes due 2043
                          
                          
  
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                              65473QBB8 / US65473QBB86
 
                              
                               
                       |  
                      
                           
                               $500,000,000  
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                               5  
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                               2.00% U.S. Treasury due 2/15/2020
                                 
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                ________________________________________________________________________________________________________________________________________________________________________________ 
                a The offers with respect to the 6.25% Notes due 2040, 5.95% Notes due 2041, 5.80% Notes due 2042, 5.65% Notes due 2045 and 5.25% Notes due 2043 
                (collectively, the “Maximum Tender Offer Notes”) are subject to an aggregate 
                maximum repurchase amount (excluding accrued and unpaid interest) of $150,000,000  
                (the “Aggregate Maximum Repurchase Amount”).  
                The Company will allocate the Aggregate 
                Maximum Repurchase Amount to purchase Maximum Tender Offer Notes subject to the Acceptance Priority Levels as more 
                fully set forth herein.
To view copies of Tender Offer documents please click on the links below 
        				
        
      
Offer to Purchase 
          
Press Release  
          
  Any questions regarding procedures for tendering Securities or requests for additional 
  copies of this Offer to Purchase and the Notice of Guaranteed Delivery should be directed to the Tender and Information Agent.
   
     
                    
                     
     
The Tender and Information Agent for the Any and All Tender Offer is:   
|            D.F. KING & CO., INC.
                      
 		
        
            
             48 Wall Street, 22nd Floor 
New York, NY 10005
  
Banks and Brokers call:  (212) 269-5550 
Toll free:  (877) 679-4107
  
By email: nisource@dfking.com
  
By facsimile: 
(For Eligible Institutions only): 
(212) 709-3328 
Attn: Andrew Beck
  
For Confirmation: 
(212) 269-5552 
  
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  If a Holder has questions about any of the Tender Offers or the procedures for tendering Securities, the Holder should contact the Tender and Information Agent or the 
  Dealer Manager at their respective telephone numbers.  Requests for documents relating to the Tender Offers, including this Offer to Purchase, should be directed to the Tender and Information Agent.
   
          
   
 
     
The Dealer Manager for the Tender Offers is:   
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           Credit Suisse Securities (USA) LLC
                      
 		
        
            
           Eleven Madison Avenue 
New York, New York 10010-3629 
Toll-Free: (800) 820-1653 
Collect: (212) 325-2476 
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