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

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):

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

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

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

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

On September 29-October 1, 2009, Robert Rowe, president and chief executive officer; Brian Bird, vice president, chief financial officer and treasurer; and Dan Rausch, director-investor relations of NorthWestern Corporation d/b/a NorthWestern Energy (NYSE: NWE) (the “Company”), will be in Boston, Massachusetts; Philadelphia, Pennsylvania; Princeton, New Jersey; Cincinnati, Ohio; and Columbus, Ohio; presenting certain information to investors concerning the Company .

A copy of the slide presentation is being furnished pursuant to Regulation FD as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in the slide presentation shall not be deemed to be “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section. Furthermore, the slide presentation shall not be deemed to be incorporated by reference into the Company’s filings under the Securities Act of 1933, as amended, or under the Securities Exchange Act of 1934, as amended, except as set forth with respect thereto in any such filing.

EXHIBIT NO.	DESCRIPTION OF DOCUMENT
99.1*	Slide presentation dated September 29 – October 1, 2009

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/ Miggie E. Cramblit
		Miggie E. Cramblit
		Vice President, General Counsel, Corporate Secretary and Chief Compliance Officer

EXHIBIT NO.	DESCRIPTION OF DOCUMENT
99.1*	Slide presentation dated September 29 – October 1, 2009