Black Hills, NorthWestern Energy shareholders approve merger, deal targets H2 2026 close

• Black Hills agreed to an all-stock merger with NorthWestern Energy Group, with NorthWestern set to become a wholly owned subsidiary and parent company renamed Bright Horizon Energy.
• NorthWestern shareholders are slated to receive 0.98 shares of Black Hills common stock for each NorthWestern share at closing.
• Shareholders of both companies voted to approve merger in April 2026, clearing way for closing once remaining regulatory approvals are obtained.
• NorthWestern expects transaction to close in second half of 2026.
• NorthWestern recorded USD 3.4 million of merger-related costs in first quarter 2026, booked in administrative and general expense.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Black Hills Corporation published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission (Ref. ID: 0001193125-26-226896), on May 15, 2026, and is solely responsible for the information contained therein.