UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 8, 2017 (November 6, 2017)

NorthWestern Corporation

(Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation)		1-10499 (Commission File Number)	46-0172280 (IRS Employer Identification No.)
3010 W. 69th Street Sioux Falls, South Dakota (Address of principal executive offices)			57108 (Zip Code)
	(605) 978-2900 (Registrant's telephone number, including area code)

Indicate by check mark whether the registrant is an emerging growth company as defined in as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging Growth Companyo

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

[ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

[ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 1.01 Entry into Material Definitive Agreement

Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

On November 6, 2017, NorthWestern Corporation d/b/a NorthWestern Energy (NYSE: NWE) (the "Company") issued and sold $250 million principal amount of the Company's Montana First Mortgage Bonds (the "Bonds"). The Bonds were issued in a transaction exempt from the registration requirements of the Securities Act of 1933, have not been registered under the Securities Act, and will not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act and any applicable state securities laws. The Bonds were issued in one series as follows:

Issue Date	Maturity Date	Principal Amount	Interest Rate
November 6, 2017	November 6, 2047	$250 million	4.03%

The terms of the Bonds were established in the Thirty-Seventh Supplemental Indenture, dated as of November 1, 2017 (the "Supplemental Indenture"), between the Company and The Bank of New York Mellon and Beata Harvin, as trustees. The Bonds are governed by the terms of the Mortgage and Deed of Trust dated as of October 1, 1945, as amended and supplemented, between the Company and the trustees, and the Supplemental Indenture (collectively, the “Indenture”). The Bonds will rank equally in right of payment with all current and future debt that is secured by the first mortgage lien of the Indenture.

The Company may redeem some or all of the Bonds at any time at its option prior to maturity at a make-whole price as described in the Supplemental Indenture.

The Indenture provides for customary events of default, including payment defaults and certain events of bankruptcy, insolvency and reorganization. If an event of default occurs and is continuing, the principal amount of the Bonds, plus accrued and unpaid interest, if any, may be declared immediately due and payable. In addition, under certain circumstances, and to the extent permitted by law, the trustee may be granted certain powers to take possession of, hold, operate and manage, and sell, the mortgaged property.

The description set forth above concerning the Bonds is qualified in its entirety by reference to the Supplemental Indenture which is attached hereto as Exhibit 4.1 and is incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits.

EXHIBIT NO.	DESCRIPTION OF DOCUMENT
4.1*	Thirty-Seventh Supplemental Indenture, dated as of November 1, 2017, between the Company and The Bank of New York Mellon and Beata Harvin, as trustees.

* filed herewith

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	NORTHWESTERN CORPORATION
By:	/s/ Timothy P. Olson
	Timothy P. Olson
	Corporate Secretary

Date: November 8, 2017

Index to Exhibits

EXHIBIT NO.	DESCRIPTION OF DOCUMENT
4.1*	Thirty-Seventh Supplemental Indenture, dated as of November 1, 2017, between the Company and The Bank of New York Mellon and Beata Harvin, as trustees.

* filed herewith