NorthWestern Corporation Annual Meeting of Stockholders
April 22, 2010
9:00 a.m. Central Daylight Time
NorthWestern Energy Operations Center
600 Market Steet W. •
Huron, South Dakota
The following materials are being provided to stockholders of record
as of February 22, 2010:
To vote your proxy or to request a hard copy of our annual meeting documents and voting card, please go to www.proxyvote.com. You will need the control number found on your Notice to access this site.
YOUR VOTE IS IMPORTANT • PLEASE VOTE PROMPTLY