Butte - An upgrade to the electric distribution system will necessitate a power outage for some NorthWestern Energy electric customers in Choteau on Tuesday, Sept. 8 or Wednesday, Sept. 9.

The work will complete a project started several months ago to improve service reliability for customers in the area.

The work will done from 9 a.m. to 3 p.m. each day. Customers will be notified with an automated phone message if they will be impacted by the planned power outage, which will vary for individual customers by both start time and length.

About NorthWestern Energy (NYSE: NWE)

NorthWestern 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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