NorthWestern to Host Second Quarter 2009 Financial Results Conference Call

SIOUX FALLS, S.D., July 13 /PRNewswire-FirstCall/ -- NorthWestern Corporation
d/b/a NorthWestern Energy (NYSE: NWE) today announced that it will host an
investor conference call on Wednesday, July 29, 2009 at 2:30 p.m. Eastern Time
to review its financial results for the quarter ended June 30, 2009. The
Company also plans to issue a news release detailing its second quarter 2009
financial results the morning of July 29, 2009 before the market opens.

The conference call will be webcast live on the Internet at
http://www.northwesternenergy.com under the "Investor Information" heading.
To listen, please go to the site at least 10 minutes in advance of the call to
register. An archived webcast will be available shortly after the call.

A telephonic replay of the call will be available beginning at 4:30 p.m. ET on
July 29, 2009, through August 29, 2009, at 800-475-6701, access code 107524.

To listen, please go to the site at least 10 minutes in advance of the call to
register. An archived webcast will be available shortly after the call.

About NorthWestern Energy

NorthWestern Energy is one of the largest providers of electricity and natural
gas in the Upper Midwest and Northwest, serving approximately 656,000
customers in Montana, South Dakota and Nebraska. For more information about
NorthWestern Energy, visit our Web site at www.northwesternenergy.com.

SOURCE NorthWestern Corporation

Media, Claudia Rapkoch, 1-866-622-8081, claudia.rapkoch@northwestern.com, or
Investors, Dan Rausch, +1-605-978-2902, daniel.rausch@northwestern.com, both
of NorthWestern Corporation