NorthWestern Energy Submits Supplemental Filing to Montana Public Service Commission

BUTTE, Mont., Jan. 15  /PRNewswire-FirstCall/ -- NorthWestern Energy (NYSE: NWE) announced today that it has submitted a supplemental filing regarding allocated cost of service and rate design to the Montana Public Service Commission (MPSC) in response to the determination made last October that the company's general rate case filing on October 16, 2009, did not meet the MPSC's applicable minimum filing requirements.

The MPSC has until February 2, 2010, to determine whether the supplemental filing meets the MPSC's minimum filing requirements. If the supplemental filing is found to meet minimal filing requirements, NorthWestern agreed to extend the timeframe by which the MPSC must issue a final order concerning the general rate filing by 90 days to October 11, 2010.

In its rate case filing, NorthWestern proposed a revenue requirement increase of approximately $1.96 million for its natural gas utility and approximately $15.5 million for its electric utility.

About NorthWestern Energy

NorthWestern Energy provides electricity and natural gas in the Upper Midwest and Northwest, serving approximately 656,000 customers in Montana, South Dakota and Nebraska.  More information on NorthWestern Energy is available on the Company's Web site at http://www.northwesternenergy.com/. 

DATASOURCE: NorthWestern Corporation



CONTACT:  Media, Claudia Rapkoch, 1-866-622-8081,

, or Investor Relations, Dan Rausch,

[phone], , both of NorthWestern Energy



Web Site:  http://www.northwesternenergy.com/ 

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