NWE presents at Bank of America conference; no material updates in 8-K text

NorthWestern Energy Group, Inc.

CFO Crystal Lail and IR officer Travis Meyer participating in virtual BofA Utilities Round-Robin on March 25, 2025.
Slide presentation furnished as Exhibit 99.1; content not fully included in provided filing excerpt.
No specific financial, operational, or guidance updates disclosed in the 8-K body.

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