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South Dakota energy company plans to merge with MT monopoly utility NorthWestern Energy

The merger will form a utility serving 2.1 million customers across eight states, aiming to invest over $7 billion in grid infrastructure to meet growing electricity demand.

  • On Tuesday, the boards of two regional utility companies unanimously approved a merger deal structured as an all-stock, tax-free transaction.
  • The merger responds to booming U.S. power sector consolidation driven by rising electricity demand and expanding data center consumption.
  • The merged entity will have a customer base of about 2.1 million spread throughout eight states, with its headquarters located in Rapid City, South Dakota, and Brian Bird appointed as the CEO.
  • For each NorthWestern share owned, shareholders will be given 0.98 shares of Black Hills, reflecting an approximate 4% premium and valuing each NorthWestern share close to $59.
  • The merger is expected to close in 12 to 15 months after regulatory and shareholder approvals and aims to increase scale, financial strength, and infrastructure investment.
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channelchek.com broke the news in on Tuesday, August 19, 2025.
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