Black Hills and NorthWestern Energy Merge to Create Regional Utility Giant

Deal News | Aug 19, 2025 | EIN

Black Hills and NorthWestern Energy Merge to Create Regional Utility Giant

Black Hills Corp and NorthWestern Energy Group announced a historic merger agreement to create a premier regional regulated electric and natural gas utility company. The all-stock, tax-free transaction values the new entity at an approximate enterprise value of $15.4 billion. The merger has been unanimously approved by the boards of both companies and aims to enhance customer service efficiency without major layoffs. The combined company will be headquartered in Rapid City, South Dakota, with Montana as its largest market. The transaction, which will serve around 2.1 million customers across eight states and operate extensive electric and gas infrastructure, is expected to close in 12 to 15 months pending regulatory approvals. Leadership will be a combination of executives from both companies, and a new name and ticker symbol will be announced before closing. Financial synergies from the merger include a doubling of the rate base to $11.4 billion and a long-term EPS growth target of 5% to 7%.

Sectors

  • Utilities
  • Energy Infrastructure

Geography

  • United States – The merger takes place in the United States and involves utilities that serve customers across eight contiguous states including South Dakota, Montana, and others.

Industry

  • Utilities – The merger pertains to the regulated electric and natural gas utility industry, as the merged entity will provide these services to customers across multiple states.
  • Energy Infrastructure – With investments in grid and energy infrastructure and a focus on power generation capacity, the merger involves significant elements of the energy infrastructure sector.

Financials

  • $15.4 billion – Total enterprise value of the merged company.
  • 0.98 shares – Fixed exchange ratio for NorthWestern shareholders.
  • 5% to 7% – Long-term EPS growth target for the merged entity.

Participants

NameRoleTypeDescription
Black Hills CorpMerging CompanyCompanyA regulated electric and natural gas utility company headquartered in Rapid City, South Dakota.
NorthWestern Energy Group, Inc.Merging CompanyCompanyAn electric and natural gas provider serving the northwestern region of the United States.
Brian BirdChief Executive OfficerPersonCEO of NorthWestern Energy who will serve as CEO of the merged entity.
Linn EvansPresident and CEOPersonCurrent President and CEO of Black Hills Corp, who will remain CEO until the merger is complete.
Federal Energy Regulatory CommissionRegulatory BodyGovernmentFederal body from which the merger requires approval.