NorthWestern Energy is upgrading a substation serving Toston area customers.

The work requires a power outage from 8 a.m. to noon Thursday, Nov. 12. Customers who will be impacted will be notified by an automated phone message.

The work will improve service reliability in the area and we appreciate customers' patience.

About NorthWestern Energy (Nasdaq: NWE)

NorthWestern Corporation, doing business as NorthWestern Energy, provides electricity and / or natural gas to approximately 734,800 customers in Montana, South Dakota and Nebraska. We have generated and distributed electricity in South Dakota and distributed natural gas in South Dakota and Nebraska since 1923 and have generated and distributed electricity and distributed natural gas in Montana since 2002.

Contact:

Jo Dee Black

Tel: (866) 622-8081

Email: jodee.black@northwestern.com

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