Common Contracts

NORTHWESTERN CORPORATION TO THE BANK OF NEW YORK MELLON (formerly The Bank of New York) AND BEATA HARVIN As Trustees under Mortgage and Deed of Trust, dated as of October 1, 1945, with NorthWestern Corporation THIRTY-NINTH SUPPLEMENTAL INDENTURE...

Supplemental Indenture • September 20th, 2019 • Northwestern Corp • Electric & other services combined

• Contract Type
  Supplemental Indenture
• Filed
  September 20th, 2019
• Company
  Northwestern Corp
• Industry
  Electric & other services combined

THIS THIRTY-NINTH SUPPLEMENTAL INDENTURE, dated as of September 1, 2019, between NORTHWESTERN CORPORATION, a corporation duly incorporated and existing under the laws of the State of Delaware (hereinafter called the “Company”), having its principal office at 3010 West 69th Street, Sioux Falls, South Dakota, 57108, and THE BANK OF NEW YORK MELLON (formerly The Bank of New York) (hereinafter called the “Corporate Trustee”), a corporation of the State of New York, whose principal corporate trust office is located at 240 Greenwich Street, 7E, New York, New York, 10286 (successor to MORGAN GUARANTY TRUST COMPANY OF NEW YORK (formerly Guaranty Trust Company of New York)), and BEATA HARVIN, whose post office address is c/o The Bank of New York Mellon, 240 Greenwich Street, 7E, New York, New York, 10286 (successor to Arthur E. Burke, Karl R. Henrich, H.H. Gould, R. Amundsen, P.J. Crowley, W.T. Cunningham, Douglas J. MacInnes, MaryBeth Lewicki, Ming Ryan and Philip L. Watson) (said Beata Harvin

As Trustees under Mortgage and Deed of Trust, dated as of

Supplemental Indenture • July 2nd, 2019 • Northwestern Corp • Electric & other services combined

• Contract Type
  Supplemental Indenture
• Filed
  July 2nd, 2019
• Company
  Northwestern Corp
• Industry
  Electric & other services combined

THIS THIRTY-EIGHTH SUPPLEMENTAL INDENTURE, dated as of June 1, 2019, between NORTHWESTERN CORPORATION, a corporation duly incorporated and existing under the laws of the State of Delaware (hereinafter called the “Company”), having its principal office at 3010 West 69th Street, Sioux Falls, South Dakota, 57108, and THE BANK OF NEW YORK MELLON (formerly The Bank of New York) (hereinafter called the “Corporate Trustee”), a corporation of the State of New York, whose principal corporate trust office is located at 240 Greenwich Street, 7E, New York, New York, 10286 (successor to MORGAN GUARANTY TRUST COMPANY OF NEW YORK (formerly Guaranty Trust Company of New York)), and BEATA HARVIN, whose post office address is c/o The Bank of New York Mellon, 240 Greenwich Street, 7E, New York, New York, 10286 (successor to Arthur E. Burke, Karl R. Henrich, H.H. Gould, R. Amundsen, P.J. Crowley, W.T. Cunningham, Douglas J. MacInnes, MaryBeth Lewicki, Ming Ryan and Philip L. Watson) (said Beata Harvin bei

As Trustees under Mortgage and Deed of Trust, dated as of October 1, 1945, with NorthWestern Corporation THIRTY-SEVENTH SUPPLEMENTAL INDENTURE

Supplemental Indenture • November 8th, 2017 • Northwestern Corp • Electric & other services combined

• Contract Type
  Supplemental Indenture
• Filed
  November 8th, 2017
• Company
  Northwestern Corp
• Industry
  Electric & other services combined

THIS THIRTY-SEVENTH SUPPLEMENTAL INDENTURE, dated as of November 1, 2017, between NORTHWESTERN CORPORATION, a corporation duly incorporated and existing under the laws of the State of Delaware (hereinafter called the “Company”), having its principal office at 3010 West 69th Street, Sioux Falls, South Dakota, 57108, and THE BANK OF NEW YORK MELLON (formerly The Bank of New York) (hereinafter called the “Corporate Trustee”), a corporation of the State of New York, whose principal corporate trust office is located at 101 Barclay Street, New York, New York, 10286 (successor to MORGAN GUARANTY TRUST COMPANY OF NEW YORK (formerly Guaranty Trust Company of New York)), and BEATA HARVIN, whose post office address is c/o The Bank of New York Mellon, 101 Barclay Street, New York, New York, 10286 (successor to Arthur E. Burke, Karl R. Henrich, H.H. Gould, R. Amundsen, P.J. Crowley, W.T. Cunningham, Douglas J. MacInnes, MaryBeth Lewicki, Ming Ryan and Philip L. Watson) (said Beata Harvin being here

As Trustees under Mortgage and Deed of Trust, dated as of October 1, 1945, with NorthWestern Corporation THIRTY-FIRST SUPPLEMENTAL INDENTURE Providing, among other things, for

Supplemental Indenture • December 23rd, 2013 • Northwestern Corp • Electric & other services combined

• Contract Type
  Supplemental Indenture
• Filed
  December 23rd, 2013
• Company
  Northwestern Corp
• Industry
  Electric & other services combined

THIS THIRTY-FIRST SUPPLEMENTAL INDENTURE, dated as of December 1, 2013, between NORTHWESTERN CORPORATION, a corporation duly incorporated and existing under the laws of the State of Delaware (hereinafter called the “Company”), having its principal office at 3010 West 69th Street, Sioux Falls, South Dakota, 57108, and THE BANK OF NEW YORK MELLON (formerly The Bank of New York) (hereinafter called the “Corporate Trustee”), a corporation of the State of New York, whose principal corporate trust office is located at 101 Barclay Street, New York, New York, 10286 (successor to MORGAN GUARANTY TRUST COMPANY OF NEW YORK (formerly Guaranty Trust Company of New York)), and Philip L. Watson, whose post office address is c/o The Bank of New York Mellon, 101 Barclay Street, New York, New York, 10286 (successor to Arthur E. Burke, Karl R. Henrich, H.H. Gould, R. Amundsen, P.J. Crowley, W.T. Cunningham, Douglas J. MacInnes, MaryBeth Lewicki and Ming Ryan) (said Philip L. Watson being hereinafter some

NORTHWESTERN CORPORATION TO THE BANK OF NEW YORK MELLON (formerly The Bank of New York) AND MING RYAN As Trustees under Mortgage and Deed of Trust, dated as of October 1, 1945, with NorthWestern Corporation TWENTY-EIGHTH SUPPLEMENTAL INDENTURE...

Supplemental Indenture • October 29th, 2009 • Northwestern Corp • Electric & other services combined

• Contract Type
  Supplemental Indenture
• Filed
  October 29th, 2009
• Company
  Northwestern Corp
• Industry
  Electric & other services combined

THIS TWENTY-EIGHTH SUPPLEMENTAL INDENTURE, dated as of October 1, 2009, between NORTHWESTERN CORPORATION, a corporation duly incorporated and existing under the laws of the State of Delaware (hereinafter called the “Company”), having its principal office at 3010 West 69th Street, Sioux Falls, South Dakota, 57108, and THE BANK OF NEW YORK MELLON (formerly The Bank of New York) (hereinafter called the “Corporate Trustee”), a corporation of the State of New York, whose principal corporate trust office is located at 101 Barclay Street, New York, New York, 10286 (successor to MORGAN GUARANTY TRUST COMPANY OF NEW YORK (formerly Guaranty Trust Company of New York)), and MING RYAN, whose post office address is c/o The Bank of New York Mellon, 101 Barclay Street, New York, New York, 10286 (successor to Arthur E. Burke, Karl R. Henrich, H.H. Gould, R. Amundsen, P.J. Crowley, W.T. Cunningham, Douglas J. MacInnes and MaryBeth Lewicki) (said Ming Ryan being hereinafter sometimes called the “Co-Trus