Regulators Approve NorthWestern, Black Hills Merger

Montana's Public Service Commission cleared the all-stock deal, making Montana the last state to approve the combination.

Updated on Nov. 11, 2026 in Utilities

Bold flat-color vector editorial illustration of a row of transmission towers and sagging power lines crossing open prairie toward distant mountains, evoking regional utility infrastructure. — Montana regulators approved NorthWestern Energy's all-stock merger with Black Hills Corporation on Tuesday, making Montana the last state to clear the $15.4 billion combination. AI Illustration. Upload story photo >

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The Montana Public Service Commission approved the merger of NorthWestern Energy and Black Hills Corporation at a meeting in Helena on Tuesday, November 10, 2026. The deal carries a total enterprise value of $15.4 billion and values the combined utility's equity at roughly $7.8 billion.

Why it matters

Montana was the final state to sign off on the combination, clearing the way for a larger utility holding company serving the region. Commission officials said the review weighed ratepayer cost, future energy access for Montana, and local control.

The all-stock transaction gives NorthWestern shareholders 0.98 Black Hills shares per share owned, with equity purchase consideration near $4 billion, against a combined equity value of roughly $7.8 billion. Post-close financial performance of the combined company has not yet been reported.

The players

NorthWestern Energy

A Montana-based utility company that provides electricity and natural gas to customers in the state and its surrounding region.

Black Hills Corporation

A diversified energy company headquartered in South Dakota that operates electric and natural gas utilities across several Western states.

Montana Public Service Commission

The state regulatory body responsible for overseeing utility rates, service, and mergers affecting Montana ratepayers.

The details

The merged entity will trade as HZN under the parent name Bright Horizon Energy Corporation, and NorthWestern shares convert to Black Hills stock. Ring-fencing conditions are designed to protect priority for local power, and local utility subsidiaries, customer billing and daily operations are expected to remain unchanged during initial integration.

2024: NorthWestern acquired Puget Sound Energy's 370-megawatt Colstrip share.
Tuesday, November 10, 2026: Montana PSC approved the merger following a commission meeting in Helena.

Market Landscape

The approval completes the state regulatory path for a consolidation of mid-sized Western utilities into a larger holding company. The deal positions the combined company as a bigger regional energy provider competing with other multistate utility groups.

For Montana customers, the merged company is expected to keep local utility subsidiaries, billing, and daily operations unchanged during initial integration. Ring-fencing conditions are meant to protect priority for local power supply.

The takeaway

Regulatory conditions, not just deal math, shape what customers feel from a utility merger, so watch whether ring-fencing protections hold through integration. Ratepayers and local officials should track the commission's follow-up on service and billing.