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811 
  
Montana
(888) 467-2669 
Customer Service
7 a.m. - 6 p.m., M-F
24/7 Emergency Service 
  
South Dakota and Nebraska
(800) 245-6977 
Customer Service
7 a.m. - 6 p.m., M-F
24/7 Emergency Service
  
Investor Relations
(605) 978-2945 
8 a.m.- 5 p.m. CT, M-F
  
Payment Addresses
Montana
NorthWestern Energy
Customer Services
40 E. Broadway
Butte, MT 59701 
  
South Dakota and Nebraska
NorthWestern Energy
P.O. Box 1338
Butte, MT 59702
    
Corporate Office
3010 W. 69th Street
Sioux Falls, SD 57108
(605) 978-2900 

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Customer Service
Our Customer Service offices are open
weekdays 7am - 6pm.

Montana
(888) 467-2669

South Dakota / Nebraska
(800) 245-6977

Our Locations
Find NWE Customer Service offices in your community.
Account Questions?
Submit a question about your account using our online account inquiry form and a customer service representative will follow up
with you. Please do not use this form to report
emergencies.

Bill Payment Addresses

Montana
NorthWestern Energy
40 E. Broadway
Butte, MT 59701

South Dakota / Nebraska
NorthWestern Energy
P.O. Box 1338
Butte, MT 59702

Report an Outage
NWE provides 24/7 emergency service. Sign in to your account or call us at (888) 467-2669 in Montana or (800) 245-6977 in South Dakota or Nebraska.
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Complete the online establish service request for residential accounts. If you are trying to establish service for non-residential accounts please call us.
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