My Energy Account On Friday, Sept 6th starting at 6:30 pm MT/ 7:30 pm CT our Online Customer Service Portals will be unavailable for system maintenance.Payments can be made by visiting https://www.northwesternenergy.com and selecting Pay Your Bill Online.Customer service will be available for Emergency calls only by calling MT: 888-467-2669, SD and NE: 800-245-6977. An error has occurred. Please login below. Username Password Log in Forgot Username or Password? Need a profile? Sign up. Other NorthWestern Energy Options Real Estate Agents Go to Login Community Action Agencies Go to Login Property Management (Continuous Service Agreement) Go to Login