Subject to Receipt of Satisfactory Final Regulatory Approval and Completion of Proposed Merger, Black Hills Corp. to be Renamed Bright Horizon Energy Corporation with Ticker Symbol “HZN”

Black Hills Corp. and NorthWestern Energy announced that, upon completion of their proposed merger, Black Hills will be renamed Bright Horizon Energy Corporation and its stock will trade on the NYSE under the ticker 'HZN', with NorthWestern becoming a wholly owned subsidiary. No shareholder action is required; BKH and NWE shares continue trading under their current symbols while the merger is pending. The merger has already cleared shareholder votes, Nebraska and South Dakota commissions, FERC, and HSR clearance; final completion hinges on satisfactory Montana Public Service Commission approval, expected to be considered before Nov.

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