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Butte, Mont. –  June 2, 2022– Effective immediately, Ennis Lake Road is closed downstream of Madison Dam for repairs. The road will reopen in the morning on Sunday, June 5.

Heavy rainfall on Memorial Day weekend created conditions that caused a large rock to fall Monday, May 30 on the flow line from the dam, causing damage to the flow line and the road.

Water is leaking from the flow line and across Ennis Lake Road. Heavy equipment, including a large crane, is required to repair the flow line and public access is closed for safety.

NorthWestern Energy appreciates the cooperation of recreationists as we work to make repairs and reopen the area as quickly as possible.

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About NorthWestern Energy (Nasdaq: NWE)

NorthWestern Corporation, doing business as 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 are working to deliver safe, reliable, and innovative energy solutions that create value for customers, communities, employees, and investors. This includes bridging our history as a regulated utility safely providing low-cost and reliable service with our future as a globally-aware company offering a broader array of services performed by highly-adaptable and skilled employees. We provide electricity and / or natural gas to approximately 753,600 customers in Montana, South Dakota, Nebraska and Yellowstone National Park. We have provided service in South Dakota and Nebraska since 1923 and in Montana since 2002. More information is available on the company's Web site at www.northwesternenergy.com.

Media Contacts:

Jo Dee Black

866-622-8081

jodee.black@northwestern.com