BLACK HILLS CORPORATION AND WELLS FARGO BANK, NATIONAL ASSOCIATION AS TRUSTEE SIXTH SUPPLEMENTAL INDENTURE DATED AS OF AUGUST 19, 2016 $400,000,000 3.150% NOTES DUE 2027 $300,000,000 4.200% NOTES DUE 2046Supplemental Indenture • August 19th, 2016 • Black Hills Corp /Sd/ • Electric services • New York
SIXTH SUPPLEMENTAL INDENTURE dated as of August 19, 2016 (this “Supplemental Indenture”), to the Indenture dated as of May 21, 2003 (the “Base Indenture” and, as supplemented by the First Supplemental Indenture dated as of May 21, 2003, the Second Supplemental Indenture dated as of May 14, 2009, the Third Supplemental Indenture dated as of July 16, 2010, the Fourth Supplemental Indenture dated as of November 19, 2013, the Fifth Supplemental Indenture dated as of January 13, 2016, and as further supplemented, amended or modified, the “Indenture”), by and between BLACK HILLS CORPORATION, a South Dakota corporation (the “Company”), and WELLS FARGO BANK, NATIONAL ASSOCIATION, a national banking association organized and existing under the laws of the United States of America (as successor to LaSalle Bank National Association), as trustee (the “Trustee”).
