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Great Falls, Mont. – May 29, 2026 – NorthWestern Energy will begin three natural gas infrastructure projects the week of June 1 in Great Falls to enhance system reliability, improve functionality and support future growth.

Vehicle and pedestrian traffic will be detoured. Flaggers, temporary lane closures and limited access to alleys will be required for the safety of crews and the public.

5th Street North Project

• Crews will upgrade an existing steel pipeline with a new plastic pipeline.
• All services connected to the line will also be updated.
• Work will occur in the alley between 2nd Avenue North and 1st Avenue North, from 6th Street North to the west side of 5th Street North.
• The project is expected to be completed by the first half of July.

10th Street Main Installation Project

• Crews will install a new natural gas pipeline to support future capacity and growth.
• The project also begins relocating existing infrastructure currently located on 9th Street.
• Work will take place along 10th Street from 4th Avenue South to 2nd Avenue North.
• Construction will be completed in sections of approximately 500 feet at a time

3rd Avenue South / 4th Avenue South Alley Project

• This project is coordinated with the 10th Street work.
• Crews will replace the existing natural gas main pipeline and some associated service natural gas pipelines.
• Work will occur in the alley between 3rd Avenue South and 4th Avenue South, from 10th Street South to the west side of 9th Street South.

These projects help ensure a safe, reliable natural gas system for today while preparing for the future energy needs of the Great Falls community. NorthWestern Energy thanks residents, businesses and travelers for their patience while this important work is completed.

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NorthWestern Energy - Delivering a Bright Future

NorthWestern Energy, provides essential energy infrastructure and valuable services that enrich lives and empower communities while serving as long-term partners to our customers and communities. We work to deliver safe, reliable, and innovative energy solutions that create value for customers, communities, employees, and investors. We do this by providing low-cost and reliable service performed by highly-adaptable and skilled employees. We provide electricity and / or natural gas to approximately 850,300 customers in Montana, South Dakota, Nebraska, and Yellowstone National Park. Our operations in Montana and Yellowstone National Park are conducted through our subsidiary, NW Corp, and our operations in South Dakota and Nebraska are conducted through our subsidiary, NWE Public Service. We have provided service in South Dakota and Nebraska since 1923 and in Montana since 2002.

Media Contacts:

Jo Dee Black

866-622-8081

jodee.black@northwestern.com