NorthWestern Energy Group, Inc. d/b/a NorthWestern Energy (NASDAQ:NWE) today announced that it will host an investor webinar on Thursday, April 30, 2026, at 3:30 p.m. Eastern to review its financial results for the quarter ending March 31, 2026. The Company also plans to issue a news release detailing its financial results the evening of Wednesday, April 29, 2026.

To register for the webinar, please visit https://northwesternenergy.com/earnings-registration. Registration is recommended at least 10 minutes in advance of the event, and an archived replay will be available following the event.

Notice of Virtual Annual Shareholders Meeting:

The virtual Annual Shareholders Meeting will be held on Thursday, April 30, 2026, at 12:00 p.m. Eastern. A virtual Annual Meeting enables our shareholders — regardless of size, resources, or physical location — to participate in the meeting at no cost. We are committed to ensuring that shareholders will be afforded the same rights and opportunities to participate at our virtual meeting as they would in person.

The Annual Meeting will be webcast live and can be accessed by visiting http://www.virtualshareholdermeeting.com/NWE2026. To participate in the meeting, please go to the site at least 15 minutes in advance of the meeting and follow the check-in procedures.

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, NorthWestern Corporation, and our operations in South Dakota and Nebraska are conducted through our subsidiary, NorthWestern Energy Public Service Corporation. We have provided service in South Dakota and Nebraska since 1923 and in Montana since 2002.

View source version on businesswire.com: https://www.businesswire.com/news/home/20260406909644/en/

Investor Relations Contact:

Travis Meyer

(605) 978-2967

travis.meyer@northwestern.com

Media Contact:

Jo Dee Black

(866) 622-8081

jodee.black@northwestern.com

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