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Permanent repairs, upgrades scheduled for Hebgen Dam gate

Date: Jun 27, 2022

Butte, Mont. – June 27, 2022 – Permanent  repairs and upgrades to the release gate at Hebgen Dam will begin later this summer and are expected to be complete by mid-September.

A stem coupling on the release gate failed on Nov. 30, 2021, causing the gate to partially close.  An investigation, called a Root Cause Analysis, was completed. The findings and corrective actions were reviewed and approved by the Federal Energy Regulatory Commission, the federal licensing authority for NorthWestern Energy’s Missouri-Madison Hydroelectric Project. The work taking place at Hebgen Dam will implement the corrective actions identified through the Root Cause Analysis.

Outflow from Hebgen Dam will continue over the spillway until work is completed on the dam gate.

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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

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