South Dakota PUC Approves NorthWestern, Black Hills Energy Merger

Northeast Radio SD News – South Dakota - The South Dakota Public Utilities Commission (PUC) officially approved the merger between NorthWestern Energy and Black Hills Energy during an ad hoc meeting on Wednesday, clearing the way for the creation of a massive new utility conglomerate.

Following the approval of two settlement agreements resolving all issues raised by PUC staff and intervening parties, the two investor-owned utilities will combine to form a company with an estimated enterprise value of $15.4 billion, serving approximately 2.1 million customers across eight states.

Under the terms of the merger agreement, originally signed in August 2025, NorthWestern Group will become a direct subsidiary of Black Hills Corporation. Upon the closure of the deal, Black Hills Corporation will be rebranded as Bright Horizon Energy Corporation.

Despite the corporate restructuring, state regulators were quick to reassure South Dakota residents that their day-to-day utility services and billing will remain stable. The finalized settlement does not alter the current rates, terms, or conditions of service for either company’s customers.

To secure the approval, the utilities agreed to a comprehensive set of consumer protections. According to the PUC, key benefits secured for South Dakota ratepayers include:

·         Rate Moratoriums: Extensions on current rate freezes to prevent immediate price hikes.

·         Shareholder-Funded Transition: A guarantee that corporate shareholders—not local ratepayers—will absorb the costs associated with the merger.

·         Local Presence: A commitment from the newly formed Bright Horizon Energy Corporation to maintain a strong local operational presence in South Dakota.

·         Separate Regulation: The companies will continue to operate and file for rates separately within the state.

“There are two key points I want the public to understand,” stated PUC Chairman Chris Nelson following the vote. “First, going forward, the PUC will continue to regulate NorthWestern and Black Hills Energy individually—nothing about that responsibility changes.”

Nelson also emphasized that the commission’s hands were largely tied by state law regarding the approval process. “The statute directs that the commission shall approve mergers of this kind unless there is a likelihood of significant adverse impact to customers in this state. It doesn’t say we may or if we want to; it says we shall, and that distinction matters.”

The joint application for the merger was initially filed on October 27, 2025, sparking months of extensive discovery, analysis, and settlement negotiations. Labor groups, including the Laborers International Union of North America, the Great Plains Laborers’ District Council, and South Dakota Laborers Local 620, actively participated in the docket as intervenors starting in December 2025.

PUC Vice Chairperson Kristie Fiegen praised the commission staff for holding the utilities’ feet to the fire to secure the consumer protections.

“When I first read the statute outlining our role, it appeared to set a fairly low bar. I’m thankful that our staff worked diligently to secure so many added benefits for South Dakota customers throughout this process,” Fiegen said.

Commissioner Gary Hanson echoed the sentiment, calling the resulting settlements a “historic agreement and a comprehensive package that truly benefits South Dakota.”

Residents interested in reviewing the full details of the merger and settlement agreements can access the docket (GE25-001) on the South Dakota PUC website.