To stop your NorthWestern Energy service, call the NorthWestern Energy customer service team using the numbers below and ask them to stop your service.
- Nebraska - (800) 245-6977
- South Dakota - (800) 245-6977
- Montana - (888) 467-2669
To cancel online, go to https://myaccount.northwesternenergy.com/NWESSP/EstablishServiceRequest.aspx
To cancel over the phone, call: 800-245-6977
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