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30583.048/4822- 1290 -9594, v. 1 <br />TO <br />Dated As of <br />August 1, 2012 <br />ri 1 <br />O <br />cn <br />CD <br />Please record and return to: Deborah Reichert, Paralegal, Rembolt Ludtke LLP, 1201 Lincoln Mall, Suite 102, Lincoln, NE (? <br />68508. <br />2,3 <br />TENTH SUPPLEMENTAL INDENTURE <br />NORTHWESTERN CORPORATION <br />(Formerly known as NorthWestern Public Service Company) <br />THE BANK OF NEW YORK MELLON <br />(Formerly known as The Bank of New York) <br />