Exhibit 21
SUBSIDIARIES OF THE REGISTRANT
Name	State of Jurisdiction of Incorporation or Limited Partnership
Clark Fork and Blackfoot, L.L.C.	Montana
NorthWestern Services, LLC	Delaware
Montana Generation, LLC	Delaware
Canadian-Montana Pipe Line Corporation	Canada
Risk Partners Assurance, Ltd.	Bermuda
Mountain States Transmission Intertie, LLC	Delaware
Lodge Creek Pipelines, LLC	Nevada
Willow Creek Gathering, LLC	Nevada
Havre Pipeline Company, LLC	Texas