Black Hills Corporation and NorthWestern Energy Group, Inc. have moved forward with their planned merger, initially announced in August 2025. The companies recently submitted joint applications for approval to regulatory commissions in Montana, Nebraska, and South Dakota, followed by a filing with the Federal Energy Regulatory Commission in December 2025. In January 2026, Black Hills Corp. filed additional documents with the Securities and Exchange Commission. Special meetings for shareholders of both companies are scheduled for April 2, 2026. The transaction is expected to close in the second half of 2026, pending the satisfaction or waiver of closing conditions.

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