Black Hills Corp. and NorthWestern Energy Announce $15.4 Billion Merger

On August 19, 2025, Black Hills Corp. and NorthWestern Energy Group Inc. announced their agreement to merge in an all-stock, tax-free transaction valued at approximately $15.4 billion. This merger aims to create a larger, regulated electric and natural gas utility company with a pro forma market capitalization of about $7.8 billion. The combined entity will serve approximately 2.1 million customers across eight states: Arkansas, Colorado, Iowa, Kansas, Montana, Nebraska, South Dakota, and Wyoming.

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The merger is positioned as a strategic response to rising U.S. power demand, driven by increased electricity consumption from data centers and residential use. The combined company will operate over 38,000 miles of electric lines and 59,000 miles of natural gas pipelines, with a generation capacity of 2.9 gigawatts. Executives from both companies anticipate that the merger will enhance operational efficiencies and financial resilience, allowing for an expected earnings per share (EPS) growth rate of 5% to 7% in the long term, surpassing previous forecasts of 4% to 6%.

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Upon completion of the merger, NorthWestern Energy CEO Brian Bird will lead the new company, while Black Hills CEO Linn Evans will retire. The board of directors will consist of 11 members, with six appointed by Black Hills and five by NorthWestern. The headquarters will be located in Rapid City, South Dakota.

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Linn Evans expressed enthusiasm about the merger, stating, “We are excited to bring our two highly complementary companies together to create significant long-term value for customers, employees, shareholders, and the communities we serve.” Brian Bird echoed this sentiment, emphasizing that the merger will position the new entity to better meet rising demand and support investments in energy infrastructure.

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While the merger has been largely welcomed, concerns have been raised regarding potential impacts on customer rates and job security. Although no major layoffs are anticipated, some operational overlaps may be addressed through attrition. Additionally, both companies have recently implemented rate increases, which could affect customer perceptions of the merger's benefits.

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The merger is expected to close within 12 to 15 months, pending approval from shareholders and various regulatory bodies, including the Federal Energy Regulatory Commission and state commissions in Montana, Nebraska, South Dakota, and potentially Arkansas. The companies have committed to maintaining their current dividend policies until the merger is finalized.

BKH, NWE to Form Company With $15.4B Enterprise Value

As the merger progresses, both companies will focus on engaging with stakeholders to address concerns and outline the benefits of the combined entity. The anticipated capital investments exceeding $7 billion from 2025 to 2029 will target critical infrastructure improvements to meet growing energy demands while maintaining competitive rates for consumers.

Black Hills and NorthWestern to merge

• “Together, we will be better positioned to meet rising demand, accelerate investment in energy and grid infrastructure, and support customers and communities through a rapidly evolving energy landscape.” — Brian Bird, CEO of NorthWestern Energy

Understanding The Northwestern Energy And Black Hills Merger Impact

• “The combined company will have greater scale and financial strength to consistently deliver for customers across our service territories and invest at the pace and scale that today’s energy transformation demands.” — Linn Evans, CEO of Black Hills Corp.

BKH, NWE to Form Company With $15.4B Enterprise Value