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CS) <br />CO <br />TO <br />Dated As of <br />September 1, 2015 <br />Nebraska Properties <br />THIRTEENTH SUPPLEMENTAL INDENTURE <br />THE BANK OF NEW YORK MELLON <br />(Formerly known as The Bank of New York) <br />Please record and return to: Timothy P. Olson, Senior Counsel & Corporate Secretary, NorthWestern Corporation, <br />3010 West 69 Street, Sioux Falls, SD 57108 00.00 <br />NORTHWESTERN CORPORATION <br />(Formerly known as NorthWestern Public Service Company) <br />