Form 8-K

8-K — BLACK HILLS CORP /SD/

Accession: 0001193125-26-354167

Filed: 2026-08-17

Period: 2026-08-17

CIK: 0001130464

SIC: 4911 (ELECTRIC SERVICES)

Item: Other Events

Item: Financial Statements and Exhibits

Documents

8-K — bkh-20260817.htm (Primary)

EX-99.1 — NWE Q2 2026 10-Q (bkh-ex99_1.htm)

EX-99.2 — PROFORMA STATEMENTS (bkh-ex99_2.htm)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K

8-K (Primary)

Filename: bkh-20260817.htm · Sequence: 1

8-K

false000113046400011304642026-08-172026-08-17

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 17, 2026

Black Hills Corporation

(Exact name of Registrant as Specified in Its Charter)

South Dakota

001-31303

46-0458824

(State or Other Jurisdiction

of Incorporation)

(Commission File Number)

(IRS Employer

Identification No.)

7001 Mount Rushmore Road

Rapid City, South Dakota

57702

(Address of Principal Executive Offices)

(Zip Code)

Registrant’s Telephone Number, Including Area Code: 605 721-1700

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading

Symbol(s)

Name of each exchange on which registered

Common stock of $1.00 par value

BKH

The New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 8.01 Other Events.

Black Hills Corporation ("Black Hills" or the "Company") is filing this Current Report on Form 8-K solely to provide certain information relating to the pending merger transaction involving Black Hills and NorthWestern Energy Group, Inc., a Delaware corporation (“NorthWestern”). As previously disclosed in its Current Report on Form 8-K filed on August 19, 2025, Black Hills entered into an Agreement and Plan of Merger (the “Merger Agreement”) on August 18, 2025 with NorthWestern and River Merger Sub Inc., a Delaware corporation and direct wholly owned subsidiary of Black Hills. The Merger Agreement, which was unanimously approved on August 18, 2025 by both the board of directors of Black Hills and the board of directors of NorthWestern, provides for an all-stock business combination of Black Hills and NorthWestern upon the terms and subject to the conditions set forth therein. Such conditions include, among other things, regulatory approvals, including approval from certain state regulatory commissions, as well as the Federal Energy Regulatory Commission.

This Item 8.01 contains:

Historical financial statements of NorthWestern filed in accordance with Rule 3-05 of Regulation S-X, included as Exhibit 99.1, which are incorporated herein by reference; and

Pro forma financial information of Black Hills and NorthWestern on a combined basis in accordance with Article 11 of Regulation S-X giving effect to certain pro forma adjustments related to the pending merger transaction as if it were completed on January 1, 2025 as it relates to the pro forma combined condensed statement of income, and as if it were completed on June 30, 2026 as it relates to the pro forma combined condensed balance sheet, included as Exhibit 99.2 hereto, which is incorporated herein by reference.

The pro forma information and related notes have been prepared for illustrative purposes only, based upon applicable rules of the Securities and Exchange Commission. The pro forma information does not purport to be indicative of what the combined company’s consolidated financial position or results of operations actually would have been had the pending merger transaction been completed as of the dates indicated. In addition, the unaudited pro forma combined condensed financial information does not purport to project the future financial position or operating results of the combined company. The pro forma adjustments, which are subject to uncertainties, are based on the information available at the time of the preparation of these pro forma financial statements and on the basis of certain assumptions and estimates. The pro forma financial information should be read, if at all, with the related qualifications and other notes set forth in Exhibit 99.2.

This Report does not modify or update the consolidated financial statements of Black Hills included in the Company’s periodic reports. The historical financial statements of NorthWestern included as Exhibit 99.1 were prepared by NorthWestern and previously disclosed by NorthWestern in its periodic reports; it has not been independently validated or reviewed by Black Hills.

* * *

Forward-Looking Statements

This Current Report on Form 8-K contains statements reflecting assumptions, expectations, projections, intentions or beliefs about future events that are intended as “forward-looking statements.” We make these forward-looking statements in reliance on the safe harbor protections provided under the Private Securities Litigation Reform Act of 1995. All statements, other than statements of historical facts, included in this Current Report on Form 8-K that address activities, events or developments that we expect, believe or anticipate will or may occur in the future are forward-looking statements. This includes, without limitations, completion of the merger transaction with NorthWestern and statements about the benefits of the proposed transaction between Black Hills and NorthWestern including future financial and operating results. These forward-looking statements are based on assumptions which we believe are reasonable based on current expectations and projections about future events and industry conditions and trends affecting our business. However, whether actual results and developments will conform to our expectations and predictions is subject to a number of risks and uncertainties that, among other things, could cause actual results to differ materially from those contained in the forward-looking statements.

All forward-looking statements are subject to risks, uncertainties and other factors that may cause the actual results, performance or achievements of Black Hills or NorthWestern to differ materially from any results expressed or implied by such forward-looking statements. Such factors include, among others, (1) the risk of delays in consummating the pending merger transaction, including as a result of required governmental and regulatory approvals, which may not be obtained on the expected timeline, or at all, (2) the risk of any event, change or other circumstance that could give rise to the termination of the Merger Agreement, (3) the risk that required regulatory approvals are subject to conditions not anticipated by Black Hills and NorthWestern, (4) the possibility that any of the anticipated benefits and projected synergies of the pending merger transaction will not be realized or will not be realized within the expected time period, (5) disruption to the parties’ businesses as a result of the announcement and pendency of the merger transaction, including potential distraction of management from current plans and operations of Black Hills or NorthWestern and the ability of Black Hills or NorthWestern to retain and hire key personnel, (6) reputational risk and the reaction of each company’s customers, suppliers, employees or other business partners to the pending merger transaction, (7) the possibility that the pending merger transaction may be more expensive to complete than anticipated, including as a result of unexpected factors or events, (8) the outcome of any legal or regulatory proceedings that may be instituted against Black Hills or NorthWestern related to the Merger Agreement or the pending merger transaction, (9) the risks associated with third party contracts containing consent and/or other provisions that may be triggered by the pending merger transaction, (10) legislative, regulatory, political, market, economic and other conditions, developments and uncertainties affecting Black Hills’ or NorthWestern’s businesses; (11) the evolving legal, regulatory and tax regimes under which Black Hills and NorthWestern operate; (12) restrictions during the pendency of the merger transaction that may impact Black Hills’ or NorthWestern's ability to pursue certain business opportunities or strategic transactions; and (13) unpredictability and severity of catastrophic events, including, but not limited to, extreme weather, natural disasters, acts of terrorism or outbreak of war or hostilities, as well as Black Hills’ and NorthWestern’s response to any of the aforementioned factors.

Additional factors which could affect future results of Black Hills and NorthWestern can be found in both Black Hills’ and NorthWestern’s Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, and Current Reports on Form 8-K, in each case filed with the SEC and available on the SEC’s website at http://www.sec.gov. Black Hills and NorthWestern disclaim any obligation and do not intend to update or revise any forward-looking statements contained in this communication, which speak only as of the date hereof, whether as a result of new information, future events or otherwise, except as required by federal securities laws.

Item 9.01 Financial Statements and Exhibits.

Exhibit No.

Description

99.1

Unaudited consolidated financial statements of NorthWestern Energy Group, Inc. as of and for the six months ended June 30, 2026 and 2025

99.2

Unaudited pro forma condensed combined financial statements (a) as of and for the six months ended June 30, 2026 and (b) for the year ended December 31, 2025

104

Cover Page Interactive Data File (formatted as the inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

BLACK HILLS CORPORATION

Date:

August 17, 2026

By:

/s/ Kimberly F. Nooney

Kimberly F. Nooney

Senior Vice President and Chief Financial Officer

EX-99.1 — NWE Q2 2026 10-Q

EX-99.1

Filename: bkh-ex99_1.htm · Sequence: 2

EX-99.1

NORTHWESTERN ENERGY GROUP

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(Unaudited)

(in thousands, except per share amounts)

Three Months Ended June 30,

Six Months Ended June 30,

2026

2025

2026

2025

Revenues

Electric

$ 324,254

$ 279,468

$ 686,308

$ 614,951

Gas

68,345

63,245

203,861

194,392

Total Revenues

392,599

342,713

890,169

809,343

Operating expenses

Fuel, purchased supply and direct transmission expense

(exclusive of depreciation and depletion shown separately below)

89,823

75,271

235,388

213,468

Operating and maintenance

79,095

62,336

153,635

119,045

Administrative and general

42,356

33,773

88,475

75,130

Property and other taxes

50,101

48,168

100,505

91,408

Depreciation and depletion

66,978

62,379

133,809

124,779

Total Operating Expenses

328,353

281,927

711,812

623,830

Operating income

64,246

60,786

178,357

185,513

Interest expense, net

(40,332)

(36,254)

(80,248)

(72,765)

Other income, net

4,546

7,603

4,006

Income before income taxes

28,460

24,610

105,712

116,754

Income tax expense

(3,466)

(3,382)

(17,262)

(18,586)

Net Income

$ 24,994

$ 21,228

$ 88,450

$ 98,168

Average Common Shares Outstanding

61,509

61,381

61,485

61,360

Basic Earnings per Average Common Share

0.41

0.35

1.44

1.60

Diluted Earnings per Average Common Share

0.40

0.35

1.43

1.60

Dividends Declared per Common Share

0.67

0.66

1.34

1.32

See Notes to Condensed Consolidated Financial Statements

NORTHWESTERN ENERGY GROUP

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

(in thousands)

Three Months Ended June 30,

Six Months Ended June 30,

2026

2025

2026

2025

Net Income

24,994

21,228

88,450

98,168

Other comprehensive income, net of tax:

Foreign currency translation adjustment

(2)

(3)

Reclassification of net losses on derivative instruments

113

226

Total Other Comprehensive Income

111

117

223

231

Comprehensive Income

25,105

21,345

88,673

98,399

See Notes to Condensed Consolidated Financial Statements

NORTHWESTERN ENERGY GROUP

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited)

(in thousands, except share data)

June 30, 2026

December 31, 2025

ASSETS

Current Assets:

Cash and cash equivalents

4,180

8,781

Restricted cash

20,920

21,957

Accounts receivable, net

168,782

209,751

Inventories

145,986

132,506

Regulatory assets

105,469

92,937

Prepaid expenses and other

36,312

38,010

Total current assets

481,649

503,942

Property, plant, and equipment, net

6,902,094

6,738,849

Goodwill

367,635

Regulatory assets

778,828

772,634

Other noncurrent assets

173,495

76,631

Total Assets

8,703,701

8,459,691

LIABILITIES AND SHAREHOLDERS' EQUITY

Current Liabilities:

Current maturities of finance leases

1,708

1,865

Current portion of long-term debt

44,996

104,967

Short-term borrowings

100,000

150,000

Accounts payable

114,802

129,633

Accrued expenses and other

294,896

272,373

Regulatory liabilities

26,644

38,613

Total current liabilities

583,046

697,451

Long-term finance leases

7,728

—

Long-term debt

3,442,174

3,181,040

Deferred income taxes

761,092

733,064

Noncurrent regulatory liabilities

692,026

678,861

Other noncurrent liabilities

322,298

283,535

Total Liabilities

5,808,364

5,573,951

Commitments and Contingencies (Note 11)

Shareholders' Equity:

Common stock, par value $0.01; authorized 200,000,000 shares; issued and outstanding 65,006,266 and 61,513,596 shares, respectively; Preferred stock, par value $0.01; authorized 50,000,000 shares; none issued

650

649

Treasury stock at cost

(99,035)

(97,503)

Paid-in capital

2,096,493

2,091,935

Retained earnings

903,067

896,720

Accumulated other comprehensive loss

(5,838)

(6,061)

Total Shareholders' Equity

2,895,337

2,885,740

Total Liabilities and Shareholders' Equity

8,703,701

8,459,691

See Notes to Condensed Consolidated Financial Statements

NORTHWESTERN ENERGY GROUP

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

(in thousands)

Six Months Ended June 30,

2026

2025

OPERATING ACTIVITIES:

Net income

88,450

98,168

Adjustments to reconcile net income to cash provided by operations:

Depreciation and depletion

133,809

124,779

Amortization of debt issuance costs, premium, and deferred hedge gain

1,926

2,343

Stock-based compensation costs

4,088

4,168

Equity portion of allowance for funds used during construction

(4,587)

(4,066)

Deferred income taxes

14,406

16,746

Other adjustments

(41)

151

Changes in current assets and liabilities:

Accounts receivable

40,967

32,841

Inventories

(13,480)

(2,458)

Other current assets

(5,410)

9,907

Accounts payable

(7,781)

(27,688)

Accrued expenses and other

22,571

(2,861)

Regulatory assets

(12,532)

(27,653)

Regulatory liabilities

(11,969)

(4,200)

Other noncurrent assets and liabilities

(17,185)

(8,576)

Cash Provided by Operating Activities

233,232

211,601

INVESTING ACTIVITIES:

Property, plant, and equipment additions

(304,772)

(220,978)

Investment in debt & equity securities

(1,070)

(5,778)

Cash Used in Investing Activities

(305,842)

(226,756)

FINANCING ACTIVITIES:

Dividends on common stock

(82,103)

(80,654)

Issuance of long-term debt

375,000

500,000

Repayment of short-term borrowings

(50,000)

—

Repayments on long-term debt

(60,000)

(300,000)

Line of credit repayments, net

(114,000)

(103,000)

Other financing activities, net

(1,925)

(3,660)

Cash Provided by Financing Activities

66,972

12,686

Decrease in Cash, Cash Equivalents, and Restricted Cash

(5,638)

(2,469)

Cash, Cash Equivalents, and Restricted Cash, beginning of period

30,738

29,017

Cash, Cash Equivalents, and Restricted Cash, end of period

25,100

26,548

Supplemental Cash Flow Information:

Cash (received) paid during the period for:

Production tax credits(1)

—

(8,255)

Interest

76,713

67,166

Significant non-cash transactions:

Capital expenditures included in accounts payable

34,653

32,015

(1) Proceeds from production tax credits transferred are included in cash provided by operating activities within the Condensed Consolidated Statement of Cash Flows.

See Notes to Condensed Consolidated Financial Statements

NORTHWESTERN ENERGY GROUP

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY

(Unaudited)

(in thousands, except per share data)

Three Months Ended June 30,

Number of Common Shares

Number of Treasury Shares

Common Stock

Treasury Stock

Paid in Capital

Retained Earnings

Accumulated Other Comprehensive Loss

Total Shareholders' Equity

Balance at March 31, 2025

64,870

3,497

649

(97,935)

2,086,594

913,650

(6,590)

2,896,368

Net income

—

21,228

—

21,228

Foreign currency translation adjustment, net of tax

—

Reclassification of net losses on derivative instruments from OCI to net income, net of tax

—

113

Stock-based compensation

—

1,870

—

1,870

Issuance of shares

—

(8)

—

230

210

—

440

Dividends on common stock ($0.660 per share)

—

(40,347)

—

(40,347)

Balance at June 30, 2025

64,876

3,489

649

(97,705)

2,088,674

894,531

(6,473)

2,879,676

Balance at March 31, 2026

65,001

3,498

650

(99,186)

2,094,232

919,137

(5,949)

2,908,884

Net income

—

24,994

—

24,994

Foreign currency translation adjustment, net of tax

—

(2)

Reclassification of net losses on derivative instruments from OCI to net income, net of tax

—

113

Stock-based compensation

—

2,030

—

2,030

Issuance of shares

—

(5)

—

151

231

—

382

Dividends on common stock ($0.670 per share)

—

(41,064)

—

(41,064)

Balance at June 30, 2026

65,006

3,493

650

(99,035)

2,096,493

903,067

(5,838)

2,895,337

Six Months Ended June 30,

Number of Common Shares

Number of Treasury Shares

Common Stock

Treasury Stock

Paid in Capital

Retained Earnings

Accumulated Other Comprehensive Loss

Total Shareholders' Equity

Balance at December 31, 2024

64,811

3,490

648

(97,394)

2,084,133

877,017

(6,704)

2,857,700

Net income

—

98,168

—

98,168

Foreign currency translation adjustment, net of tax

—

Reclassification of net losses on derivative instruments from OCI to net income, net of tax

—

226

Stock-based compensation

—

(729)

4,142

—

3,414

Issuance of shares

—

(1)

—

418

399

—

817

Dividends on common stock ($1.320 per share)

—

(80,654)

—

(80,654)

Balance at June 30, 2025

64,876

3,489

649

(97,705)

2,088,674

894,531

(6,473)

2,879,676

Balance at December 31, 2025

64,895

3,477

649

(97,503)

2,091,935

896,720

(6,061)

2,885,740

Net income

—

88,450

—

88,450

Foreign currency translation adjustment, net of tax

—

(3)

Reclassification of net losses on derivative instruments from OCI to net income, net of tax

—

226

Stock-based compensation

111

(1,874)

4,066

—

2,193

Issuance of shares

—

(12)

—

342

492

—

834

Dividends on common stock ($1.340 per share)

—

(82,103)

—

(82,103)

Balance at June 30, 2026

65,006

3,493

650

(99,035)

2,096,493

903,067

(5,838)

2,895,337

See Notes to Condensed Consolidated Financial Statements

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Reference is made to Notes to Financial Statements included in the NorthWestern Energy Group's Annual Report)

(Unaudited)

(1) Nature of Operations and Basis of Consolidation

NorthWestern Energy Group, doing business as NorthWestern Energy, provides electricity and/or natural gas to approximately 850,300 customers in Montana, South Dakota, Nebraska and Yellowstone National Park, through its subsidiaries NorthWestern Corporation (NW Corp) and NorthWestern Energy Public Service Corporation (NWE Public Service). We have generated and distributed electricity in South Dakota and distributed natural gas in South Dakota and Nebraska since 1923 and have generated and distributed electricity and distributed natural gas in Montana since 2002.

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (GAAP) requires us to make estimates and assumptions that may affect the reported amounts of assets, liabilities, revenues and expenses during the reporting period. Actual results could differ from those estimates. The unaudited Condensed Consolidated Financial Statements (Financial Statements) reflect all adjustments (which unless otherwise noted are normal and recurring in nature) that are, in our opinion, necessary to fairly present our financial position, results of operations and cash flows. The actual results for the interim periods are not necessarily indicative of the operating results to be expected for a full year or for other interim periods. Events occurring subsequent to June 30, 2026 have been evaluated as to their potential impact to the Financial Statements through the date of issuance.

The Financial Statements included herein have been prepared by NorthWestern, without audit, pursuant to the rules and regulations of the SEC. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations; however, we believe that the condensed disclosures provided are adequate to make the information presented not misleading. We recommend that these Financial Statements be read in conjunction with the audited financial statements and related footnotes included in the NorthWestern Energy Group Annual Report on Form 10-K for the year ended December 31, 2025.

Supplemental Cash Flow Information

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the Condensed Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Condensed Consolidated Statements of Cash Flows (in thousands):

June 30,

December 31,

June 30,

December 31,

2026

2025

2024

Cash and cash equivalents

4,180

8,781

2,936

4,283

Restricted cash

20,920

21,957

23,612

24,734

Total cash, cash equivalents, and restricted cash shown in the Condensed Consolidated Statements of Cash Flows

25,100

30,738

26,548

29,017

Goodwill

We completed our annual goodwill impairment test as of April 1, 2026, and no impairment was identified. We evaluated qualitative factors (including macroeconomic conditions, industry and market considerations, cost factors, and overall financial performance) to determine whether it was more likely than not that the fair value of our reporting units was less than its carrying amount. Our evaluation of these factors concluded that it was not more likely than not that the fair value of our reporting units was less than its carrying amount and therefore no further testing was necessary.

(2) Pending Merger with Black Hills Corporation

On August 18, 2025, we entered into a Merger Agreement with Black Hills and River Merger Sub, Inc., a Delaware corporation and direct

wholly owned subsidiary of Black Hills (Merger Sub). The Merger Agreement provides for an all-stock merger of equals between NorthWestern and Black Hills upon the terms and subject to the conditions set forth therein. The Merger Agreement provides for Merger Sub to merge with and into NorthWestern, with NorthWestern continuing as the surviving entity and a direct wholly owned subsidiary of Black Hills, which would assume the new corporate name of Bright Horizon Energy as the resulting parent company of the combined corporate group. Under the provisions of ASC Topic 805, which requires the identification of an acquirer in a business combination, Black Hills is the accounting acquirer. Pursuant to the Merger Agreement, at the effective time of the Merger, each share of NorthWestern, par value $0.01 per share, issued and outstanding as of immediately prior to closing will be converted into the right to receive 0.98 validly issued, fully paid and non-assessable shares of Black Hills Common Stock.

In connection with this pending merger, we have incurred merger-related costs. During the three and six months ended June 30, 2026, we have incurred $3.3 million and $6.7 million, respectively, of merger-related costs, which are included in our Administrative and general expenses.

Regulatory and Shareholder Approvals

Our pending merger with Black Hills was unanimously approved by our board of directors and Black Hills' board of directors. In February 2026, the Form S-4, which contains joint proxy statement/prospectus for NorthWestern and Black Hills, was declared effective by the SEC. In April 2026, shareholders of each company voted to approve the Merger and the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act expired, permitting consummation of the transaction. In May 2026, the Federal Energy Regulatory Commission (FERC) and the Nebraska Public Service Commission (NPSC) each approved the Merger. In June 2026, the South Dakota Public Utilities Commission (SDPUC) approved the merger.

The completion of the Merger remains subject to the satisfaction or waiver of certain conditions to closing, including (1) subject to certain conditions, the receipt of certain regulatory approvals, including approval from the Montana Public Service Commission (MPSC) on such terms and conditions that would not result in a material adverse effect on Bright Horizon Energy; (2) the absence of any court order or regulatory injunction prohibiting the completion of the Merger; (3) the authorization for listing of shares of Black Hills Common Stock to be issued in the Merger on a mutually agreed stock exchange; (4) subject to specified materiality standards, the accuracy of the representations and warranties of each party; (5) compliance by each party in all material respects with its covenants; (6) the absence of a material adverse effect on each party; and (7) receipt of each party of an opinion relating to the anticipated tax-free treatment of the Merger.

We filed an application with the MPSC for approval of the Merger, and in April 2026, we reached a settlement agreement with certain key intervenors in Montana, which is subject to the approval by the MPSC. In May 2026, a hearing with the MPSC was held and we await their final order.

We anticipate the transaction closing by year-end 2026, subject to the satisfaction or waiver of certain closing conditions.

(3) Regulatory Matters

Montana Rate Review

In December 2025, the MPSC issued a final order approving our partial electric settlement agreement. The final order also suspended the 90/10 cost sharing mechanism of the Power Cost and Credit Adjustment Mechanism (PCCAM) on a temporary basis pending further review by the MPSC. Within this final order, the MPSC disallowed a portion of the capital costs related to the construction of Yellowstone County Generating Station (YCGS). As a result, in the fourth quarter of 2025 we recorded a $30.9 million non-cash charge for the regulatory disallowance. As of June 30, 2026, we have $3.6 million reserved within Regulatory liabilities on the Condensed Consolidated Balance Sheets for interim rates to be refunded to customers.

In January 2026, we filed a Motion for Reconsideration (Motion) as it relates to this final order. Among other things, our Motion requests that the MPSC reconsider their prudence conclusions regarding the capital costs associated with the construction of YCGS and clarification as to the effective date of the PCCAM sharing mechanism suspension, for which we have requested an effective date of July 1, 2025, to align with the PCCAM tracker year. Any subsequent modifications by the MPSC to their final order are expected to be reflected in our 2026 results.

Colstrip Acquisitions and Requests for Cost Recovery

In January 2023, and July 2024, we entered into definitive agreements with Avista Corporation (Avista) and Puget Sound Energy (Puget), respectively, to acquire their respective interests in Colstrip Units 3 and 4 for $0 and completed these acquisitions on January 1, 2026. Accordingly, we are responsible for the associated operating costs beginning on January 1, 2026, which we will not collect through utility base rates, until requested in a future Montana rate review. Puget and Avista will remain responsible for their respective pre-closing share of environmental, asset retirement obligations (AROs), and pension liabilities attributed to events or conditions existing prior to the closing of the transaction and for any future decommissioning and demolition costs associated with the existing facilities that comprise their interests.

While Puget and Avista remain contractually obligated for the pre-closing share of AROs, we remain the primary obligor. As such, as of June 30, 2026, we have recorded $2.8 million and $34.2 million within Accrued expenses and other and Other noncurrent liabilities, respectively, on the Condensed Consolidated Balance Sheets for these AROs, and we have recorded an indemnification asset of $2.8 million and $34.2 million with Prepaid expenses and other and Other noncurrent assets, respectively, on the Condensed Consolidated Balance Sheets.

Avista Interests - The 222 megawatts of generation capacity from Colstrip Units 3 and 4 acquired from Avista (Avista Interests) on January 1, 2026, was identified as a key element in our strategy to achieve resource adequacy for customers, as outlined in our 2023 Montana Integrated Resource Plan. Noting the costs associated with operating this resource are not currently reflected in utility customer rates, in August 2025, we filed a temporary PCCAM tariff waiver request with the MPSC that could provide a near-term cost-recovery mechanism to offset a portion of the approximately $18 million in annual incremental operating and maintenance costs associated with the Avista Interests. This waiver requested that the MPSC allow us to keep 100 percent of the net revenue associated with certain designated power sales contracts up to the amount of the operating and maintenance expenses we incur associated with our Avista Interests. Furthermore, the waiver request indicated that any net revenues from the designated contracts exceeding the operating and maintenance expenses associated with our Avista Interests would continue to flow back to retail customers. In January 2026, the MPSC approved our PCCAM tariff waiver request on an interim basis with final approval or denial subject to the ongoing PCCAM docket process.

During the three and six months ended June 30, 2026, power prices in the Pacific Northwest associated with these designated power sales contracts included within our PCCAM tariff waiver were insufficient to contribute to the recovery of the operating and maintenance expenses associated with the Avista Interests.

Puget Interests - The 370 megawatts of generation capacity from Colstrip Units 3 and 4 acquired from Puget (Puget Interests) on January 1, 2026, increases our ownership share of the facility to 55 percent and provides an increase in voting share in determining strategic direction and investment decisions at the facility. Unlike the Avista Interests, we do not currently need this capacity to serve existing customers in Montana. As such, the Puget Interests are held by our FERC regulated subsidiary to isolate the costs associated with this acquired interest from our Montana retail customers. While we expect our future opportunity to serve growing customer demand, including large-load customers, may be supported by this resource, in October 2025, we signed a contract to sell the dispatchable capacity and associated energy from the Puget Interests beginning January 1, 2026, through late 2027. Revenues from this agreement are expected to largely offset the estimated $30 million of annual incremental operating and maintenance costs associated with the Puget Interests. In addition, in October 2025, we submitted a request to the FERC for approval of cost-based rates for our subsidiary that will own the Puget Interests. In February 2026, the FERC approved both the cost based rates and the contract rates retroactive to January 1, 2026. In March 2026, two MPSC commissioners, in their individual capacity, filed a motion with the FERC requesting a rehearing that largely reiterated arguments previously rejected by the FERC. The FERC denied this motion by operation of law. In June 2026, the two MPSC commissioners appealed the decision to the Ninth Circuit. We have intervened in the case.

(4) Income Taxes

We compute income tax expense for each quarter based on the estimated annual effective tax rate for the year, adjusted for certain discrete items. Our effective tax rate typically differs from the federal statutory tax rate due to the regulatory impact of flowing through the federal and state tax benefit of repairs deductions, state tax benefit of accelerated tax depreciation deductions (including bonus depreciation when applicable) and production tax credits. The regulatory accounting treatment of these deductions requires immediate income recognition for temporary tax differences of this type, which is referred to as the flow-through method. When the flow-through method of accounting for temporary differences is reflected in regulated revenues, we record deferred income taxes and establish related regulatory assets and liabilities.

During the three months ended June 30, 2026 income tax expense was $3.5 million compared to $3.4 million for the same period in 2025.

For the three months ended June 30, 2026, the effective tax rate was 12.2% compared to 13.7% for the same period in 2025. The lower effective tax rate was primarily due to higher flow through repairs deductions partly offset by higher plant depreciation flow through items.

During the six months ended June 30, 2026 income tax expense was $17.3 million compared to $18.6 million for the same period in 2025. For the six months ended June 30, 2026, the effective tax rate was 16.3% compared to 15.9% for the same period in 2025. The higher effective tax rate was primarily due to higher plant depreciation flow through items and lower production tax credits, partly offset by higher flow through repairs deductions.

(5) Comprehensive Income (Loss)

The following tables display the components of Other Comprehensive Income (Loss), after-tax, and the related tax effects (in thousands):

Three Months Ended

June 30, 2026

June 30, 2025

Before-Tax Amount

Tax Expense

Net-of-Tax Amount

Before-Tax Amount

Tax Expense

Net-of-Tax Amount

Foreign currency translation adjustment

(2)

—

(2)

—

Reclassification of net income on derivative instruments

153

(40)

113

153

(40)

113

Other comprehensive income (loss)

151

(40)

111

157

(40)

117

Six Months Ended

June 30, 2026

June 30, 2025

Before-Tax Amount

Tax Expense

Net-of-Tax Amount

Before-Tax Amount

Tax Expense

Net-of-Tax Amount

Foreign currency translation adjustment

(3)

—

(3)

—

Reclassification of net income on derivative instruments

306

(80)

226

306

(80)

226

Other comprehensive income (loss)

303

(80)

223

311

(80)

231

Balances by classification included within accumulated other comprehensive loss (AOCL) on the Condensed Consolidated Balance Sheets are as follows, net of tax (in thousands):

June 30, 2026

December 31, 2025

Foreign currency translation

1,448

1,451

Derivative instruments designated as cash flow hedges

(8,243)

(8,469)

Postretirement medical plans

957

Accumulated other comprehensive loss

(5,838)

(6,061)

The following tables display the changes in AOCL by component, net of tax (in thousands):

Three Months Ended

June 30, 2026

Affected Line Item in the Condensed Consolidated Statements of Income

Interest Rate Derivative Instruments Designated as Cash Flow Hedges

Postretirement Medical Plans

Foreign Currency Translation

Total

Beginning balance

(8,356)

957

1,450

(5,949)

Other comprehensive loss before reclassifications

—

(2)

Amounts reclassified from AOCL

Interest Expense

113

—

113

Net current-period other comprehensive income (loss)

113

—

(2)

111

Ending balance

(8,243)

957

1,448

(5,838)

Three Months Ended

June 30, 2025

Affected Line Item in the Condensed Consolidated Statements of Income

Interest Rate Derivative Instruments Designated as Cash Flow Hedges

Postretirement Medical Plans

Foreign Currency Translation

Total

Beginning balance

(8,808)

784

1,434

(6,590)

Other comprehensive income before reclassifications

—

Amounts reclassified from AOCL

Interest Expense

113

—

113

Net current-period other comprehensive income

113

—

117

Ending balance

(8,695)

784

1,438

(6,473)

Six Months Ended

June 30, 2026

Affected Line Item in the Condensed Consolidated Statements of Income

Interest Rate Derivative Instruments Designated as Cash Flow Hedges

Postretirement Medical Plans

Foreign Currency Translation

Total

Beginning balance

(8,469)

957

1,451

(6,061)

Other comprehensive loss before reclassifications

—

(3)

Amounts reclassified from AOCL

Interest Expense

226

—

226

Net current-period other comprehensive income (loss)

226

—

(3)

223

Ending balance

(8,243)

957

1,448

(5,838)

Six Months Ended

June 30, 2025

Affected Line Item in the Condensed Consolidated Statements of Income

Interest Rate Derivative Instruments Designated as Cash Flow Hedges

Postretirement Medical Plans

Foreign Currency Translation

Total

Beginning balance

(8,921)

784

1,433

(6,704)

Other comprehensive income before reclassifications

—

Amounts reclassified from AOCL

Interest Expense

226

—

226

Net current-period other comprehensive income

226

—

231

Ending balance

(8,695)

784

1,438

(6,473)

(6) Financing Activities

We exercised a five-year renewal option on a default supply procurement agreement, which we have recorded as a finance lease on our Condensed Consolidated Balance Sheets. As a result, the finance lease term was extended and will mature on June 30, 2031.

On April 9, 2026, we amended our existing NorthWestern Energy Group Term Loan Credit Agreement (NWE Group Term Loan) to extend the maturity date from April 10, 2026 to December 31, 2026. In May 2026, we repaid $50.0 million of this NWE Group Term Loan.

On April 28, 2026, NWE Public Service priced $150.0 million aggregate principal amount of South Dakota First Mortgage Bonds at a fixed interest rate of 5.51 percent maturing on June 15, 2036. We completed the issuance and sale of these bonds on June 15, 2026. Proceeds were utilized to redeem NWE Public Service's $60.0 million of 2.80 percent South Dakota First Mortgage Bonds due on June 15, 2026, to repay outstanding borrowings under our credit facility, and for general utility purposes.

On May 27, 2026, NW Corp entered into a $225.0 million secured Term Loan Credit Agreement (NW Corp Term Loan) with a maturity date of November 26, 2027. NW Corp's obligations under the NW Corp Term Loan are secured by $225.0 million of Montana First Mortgage Bonds issued to the administrative agent of the term loan facility. Borrowings may be made at a variable interest rate equal to the Secured Overnight Financing Rate plus an applicable margin as provided in the NW Corp Term Loan. Proceeds were used to repay a portion of NW Corp's outstanding revolving credit facility borrowings. The NW Corp Term Loan provides for prepayment of the principal and interest; however, amounts prepaid may not be reborrowed. The NW Corp Term Loan requires NW Corp to maintain a consolidated indebtedness to total capitalization ratio of 65 percent or less. It also contains covenants which, among other things, limit our ability to engage in any consolidation or merger (except for our pending merger with Black Hills) or otherwise liquidate or dissolve, dispose of property, and restricts certain affiliate transactions.

(7) Segment Information

Our reportable segments are engaged in the electric and natural gas utility businesses.

Our Chief Operating Decision Maker (CODM), who is our Chief Executive Officer, uses segment net income to evaluate if our operating segments are earning their authorized rate of return and in the annual budget and forecasting process. Our CODM also uses segment net income to determine how to allocate capital resources between our operating segments and when to allocate the resources necessary to file for rate reviews. Segment asset and capital expenditure information is not provided for our reportable segments. As an integrated electric and gas utility, we operate significant assets that are not dedicated to a specific reportable segment.

Financial data for the reportable segments are as follows (in thousands):

Three Months Ended

June 30, 2026

Electric

Gas

Total

Operating revenues

324,254

68,345

392,599

Fuel, purchased supply and direct transmission expense (exclusive of depreciation and depletion shown separately below)

72,836

16,987

89,823

Operating, general, and administrative

91,739

25,551

117,290

Property and other taxes

39,056

11,044

50,100

Depreciation and depletion

55,562

11,416

66,978

Interest expense, net

(30,589)

(8,086)

(38,675)

Other income, net

2,941

1,167

4,108

Income tax (expense) benefit

(5,451)

304

(5,147)

Segment net income (loss)

31,962

(3,268)

28,694

Reconciliation to consolidated net income

Other, net(1)

(3,700)

Consolidated net income

24,994

Three Months Ended

June 30, 2025

Electric

Gas

Total

Operating revenues

279,468

63,245

342,713

Fuel, purchased supply and direct transmission expense (exclusive of depreciation and depletion shown separately below)

59,603

15,668

75,271

Operating, general, and administrative

73,615

22,773

96,388

Property and other taxes

37,318

10,850

48,168

Depreciation and depletion

52,387

9,992

62,379

Interest expense, net

(27,562)

(7,297)

(34,859)

Other income, net

121

456

577

Income tax (expense) benefit

(4,230)

201

(4,029)

Segment net income (loss)

24,874

(2,678)

22,196

Reconciliation to consolidated net income

Other, net(1)

(968)

Consolidated net income

21,228

Six Months Ended

June 30, 2026

Electric

Gas

Total

Operating revenues

686,308

203,861

890,169

Fuel, purchased supply and direct transmission expense (exclusive of depreciation and depletion shown separately below)

163,111

72,277

235,388

Operating, general, and administrative

181,340

52,682

234,022

Property and other taxes

78,267

22,196

100,463

Depreciation and depletion

111,031

22,778

133,809

Interest expense, net

(60,774)

(15,957)

(76,731)

Other income, net

4,486

1,791

6,277

Income tax expense

(16,934)

(2,831)

(19,765)

Segment net income

79,337

16,931

96,268

Reconciliation to consolidated net income

Other, net(1)

(7,818)

Consolidated net income

88,450

Six Months Ended

June 30, 2025

Electric

Gas

Total

Operating revenues

614,951

194,392

809,343

Fuel, purchased supply and direct transmission expense (exclusive of depreciation and depletion shown separately below)

152,355

61,113

213,468

Operating, general, and administrative

146,094

47,943

194,037

Property and other taxes

70,604

20,645

91,249

Depreciation and depletion

104,875

19,904

124,779

Interest expense, net

(55,318)

(14,331)

(69,649)

Other income, net

2,611

1,547

4,158

Income tax expense

(14,102)

(4,226)

(18,328)

Segment net income

74,214

27,777

101,991

Reconciliation to consolidated net income

Other, net(1)

(3,823)

Consolidated net income

98,168

(1) Consists of unallocated corporate costs, including merger-related costs, and certain limited unregulated activity within the energy industry.

(8) Revenue from Contracts with Customers

Nature of Goods and Services

We provide retail electric and natural gas services to three primary customer classes. Our largest customer class consists of residential customers, which includes single private dwellings and individual apartments. Our commercial customers consist primarily of main street businesses, and our industrial customers consist primarily of manufacturing and processing businesses that turn raw materials into products.

Electric Segment - Our regulated electric utility business primarily provides generation, transmission, and distribution services to customers in our Montana and South Dakota jurisdictions. We recognize revenue when electricity is delivered to the customer. Payments on our tariff-based sales are generally due 0-30 days after the billing date.

Natural Gas Segment - Our regulated natural gas utility business primarily provides production, storage, transmission, and distribution services to customers in our Montana, South Dakota, and Nebraska jurisdictions. We recognize revenue when natural gas is delivered to the customer. Payments on our tariff-based sales are generally due 0-30 days after the billing date.

Disaggregation of Revenue

The following tables disaggregate our revenue by major source and customer class (in thousands):

Three Months Ended

June 30, 2026

June 30, 2025

Electric

Natural Gas

Total

Electric

Natural Gas

Total

Montana

98,447

19,711

118,158

81,824

17,968

99,792

South Dakota

17,983

5,776

23,759

16,235

5,566

21,801

Nebraska

—

4,196

—

4,523

Residential

116,430

29,683

146,113

98,059

28,057

126,116

Montana

110,833

12,211

123,044

93,910

10,499

104,409

South Dakota

30,341

4,141

34,482

27,737

3,920

31,657

Nebraska

—

1,994

—

2,346

Commercial

141,174

18,346

159,520

121,647

16,765

138,412

Industrial

10,831

844

11,675

9,888

144

10,032

Lighting, governmental, irrigation, and interdepartmental

14,144

268

14,412

9,421

270

9,691

Total Retail Revenues

282,579

49,141

331,720

239,015

45,236

284,251

Regulatory Amortization

(3,645)

5,925

2,280

10,325

5,189

15,514

Transmission

29,141

—

29,141

28,147

—

28,147

Transportation, wholesale and other

16,179

13,279

29,458

1,981

12,820

14,801

Total Revenues

324,254

68,345

392,599

279,468

63,245

342,713

Six Months Ended

June 30, 2026

June 30, 2025

Electric

Natural Gas

Total

Electric

Natural Gas

Total

Montana

218,885

67,849

286,734

196,801

69,386

266,187

South Dakota

41,212

20,300

61,512

38,527

21,136

59,663

Nebraska

—

15,357

—

17,732

Residential

260,097

103,506

363,603

235,328

108,254

343,582

Montana

217,315

39,088

256,403

190,862

37,257

228,119

South Dakota

61,738

15,895

77,633

57,051

15,095

72,146

Nebraska

—

8,500

—

9,787

Commercial

279,053

63,483

342,536

247,913

62,139

310,052

Industrial

22,695

1,635

24,330

19,988

628

20,616

Lighting, governmental, irrigation, and interdepartmental

19,653

792

20,445

14,114

861

14,975

Total Retail Revenues

581,498

169,416

750,914

517,343

171,882

689,225

Regulatory Amortization

6,426

4,924

11,350

38,015

(4,247)

33,768

Transmission

60,112

—

60,112

54,703

—

54,703

Transportation, wholesale and other

38,272

29,521

67,793

4,890

26,757

31,647

Total Revenues

686,308

203,861

890,169

614,951

194,392

809,343

(9) Earnings Per Share

Basic earnings per share are computed by dividing earnings applicable to common stock by the weighted average number of common shares outstanding for the period. Diluted earnings per share reflect the potential dilution of common stock equivalent shares that could occur if unvested shares were to vest. Common stock equivalent shares are calculated using the treasury stock method, as applicable. The dilutive effect is computed by dividing earnings applicable to common stock by the weighted average number of common shares outstanding plus the effect of the outstanding unvested restricted stock and performance share awards. Average shares used in computing the basic and diluted earnings per share are as follows:

Three Months Ended

June 30, 2026

June 30, 2025

Basic computation

61,508,960

61,380,777

Dilutive effect of:

Performance and restricted share awards(1)

265,634

103,169

Diluted computation

61,774,594

61,483,946

Six Months Ended

June 30, 2026

June 30, 2025

Basic computation

61,484,991

61,360,252

Dilutive effect of:

Performance and restricted share awards(1)

218,440

95,733

Diluted computation

61,703,431

61,455,985

(1) Performance share awards are included in diluted weighted average number of shares outstanding based upon what would be issued if the end of the most recent reporting period was the end of the term of the award.

As of June 30, 2026, there were no shares from performance and restricted share awards which were antidilutive and excluded from the earnings per share calculations, compared to 68,107 shares as of June 30, 2025.

(10) Employee Benefit Plans

We sponsor and/or contribute to pension and postretirement health care and life insurance benefit plans for eligible employees. Net periodic benefit cost (credit) for our pension and other postretirement plans consists of the following (in thousands):

Pension Benefits

Other Postretirement Benefits

Six Months Ended June 30,

2026

2025

2026

2025

Components of Net Periodic Benefit Cost (Credit)

Service cost

2,243

2,362

102

128

Interest cost

5,744

12,149

195

256

Expected return on plan assets

(5,825)

(11,476)

(806)

(709)

Recognized actuarial gain

—

(343)

(138)

Net periodic benefit cost (credit)

2,162

3,035

(852)

(463)

We contributed $4.9 million to our pension plans during the six months ended June 30, 2026. We expect to contribute an additional $6.6 million to our pension plans during the remainder of 2026.

(11) Commitments and Contingencies

Parent Guarantee

NorthWestern Energy Group, Inc. has guaranteed the contractual obligations of its wholly-owned subsidiary, NorthWestern Colstrip 370Pu, LLC (NW Colstrip 370), to its counterparty to an agreement for the sale of capacity and energy from our recently acquired 370 megawatt ownership interest in the Colstrip facility. The guarantee exists during the January 2026 through September 2027 term of the agreement. The guarantee is unconditional and irrevocable, covering all payment obligations of the subsidiary under the contract up to a maximum amount of $15.0 million. The guarantee is triggered in an event where NW Colstrip 370 fails to pay any amounts that could come due under the agreement. As of June 30, 2026, no demand has been made under the guarantee and management believes that risk of material payment under this guarantee is remote.

ENVIRONMENTAL LIABILITIES AND REGULATION

The circumstances set forth in Note 20 - Commitments and Contingencies to the financial statements included in the NorthWestern Energy Group Annual Report on Form 10-K for the year ended December 31, 2025 appropriately represent, in all material respects, the current status of our environmental liabilities and regulation.

LEGAL PROCEEDINGS

We are subject to various legal proceedings, governmental audits and claims that arise in the ordinary course of business. In our opinion, the amount of ultimate liability with respect to these other actions will not materially affect our financial position, results of operations, or cash flows.

EX-99.2 — PROFORMA STATEMENTS

EX-99.2

Filename: bkh-ex99_2.htm · Sequence: 3

EX-99.2

UNAUDITED PRO FORMA CONDENSED COMBINED CONSOLIDATED FINANCIAL INFORMATION

On August 18, 2025, Black Hills Corporation, a South Dakota corporation (“Black Hills” or the “Company”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with NorthWestern Energy Group, Inc., a Delaware corporation (“NorthWestern”) and River Merger Sub Inc., a Delaware corporation and direct wholly owned subsidiary of Black Hills (“Merger Sub”). The Merger Agreement, which has been unanimously approved by both the board of directors of Black Hills and the board of directors of NorthWestern, provides for an all-stock merger of Black Hills and NorthWestern upon the terms and subject to the conditions set forth therein.

The Merger Agreement provides for Merger Sub to merge with and into NorthWestern (the "Merger"), with NorthWestern continuing as the surviving entity and a direct wholly owned subsidiary of Black Hills, which would assume a new corporate name, Bright Horizon Energy Corporation, as the resulting parent company of the combined corporate group.

At the effective time of the Merger (the “Effective Time”), each share of common stock of NorthWestern, par value $0.01 per share (the "NorthWestern Common Stock", issued and outstanding as of immediately prior to the Effective Time will be converted into the right to receive 0.98 (the "Exchange Ratio") validly issued, fully paid and non-assessable shares of common stock of Black Hills, par value $1.00 per share (the "Black Hills Common Stock") (or cash in lieu of fractional shares thereof), in each case upon and subject to the terms and conditions of the Merger Agreement.

The following unaudited pro forma condensed combined financial statements, which have been prepared to give effect to the Merger in accordance with Article 11 of Regulation S-X and are limited to adjustments required by such rules, include adjustments for the following:

•

certain reclassifications to conform the historical financial statement presentation of Black Hills and NorthWestern; and

•

application of the acquisition method of accounting under the provisions of the Financial Accounting Standards Board (FASB) Accounting Standards Codification, which we refer to as ASC 805, “Business Combinations,” to reflect estimated merger consideration of approximately $4.4 billion in exchange for 100% of all outstanding NorthWestern Common Stock;

The unaudited pro forma financial information should be read, if at all, together with its accompanying notes and in conjunction with the following historical consolidated financial statements and accompanying notes of Black Hills and NorthWestern, referenced below. The pro forma financial statements of Black Hills have been derived from:

•

the audited consolidated financial statements of Black Hills as of and for the year ended December 31, 2025 included in Black Hills’ Annual Report on Form 10-K for the fiscal year then ended;

•

the unaudited consolidated financial statements of Black Hills as of and for the six months ended June 30, 2026 included in Black Hills’ Quarterly Report on Form 10-Q for the quarterly period then ended;

•

the audited consolidated financial statements of NorthWestern for the year ended December 31, 2025, included in NorthWestern's Annual Report on Form 10-K for the fiscal year then ended, filed as Exhibit 99.1 to Black Hills' Form 8-K filed on February 19, 2026; and

•

the unaudited consolidated financial statements of NorthWestern as of and for the six months ended June 30, 2026, included in NorthWestern's’ Quarterly Report on Form 10-Q for the quarterly period then ended, filed as Exhibit 99.1 to the Current Report on Form 8-K;

The unaudited pro forma combined condensed statement of income combine the Black Hills and NorthWestern historical consolidated income statements for the six months ended June 30, 2026 and year ended December 31, 2025, giving effect to the Merger as if it were completed on January 1, 2025. The unaudited pro forma combined condensed balance sheet as of June 30, 2026 gives effect to the Merger as if it were completed on that date.

The historical consolidated financial information has been adjusted in the unaudited pro forma financial statements to give effect to certain pro forma events that are directly attributable to the Merger and factually supportable. The unaudited pro forma financial statements do not reflect other potential effects of the Merger, such as anticipated cost savings (or associated costs to achieve such savings) from operating efficiencies or restructuring that could result from the Merger, the effect of any regulatory actions that may impact the pro forma financial statements following completion of the Merger or the effects of any changes in business or market conditions as a result of the Merger or otherwise.

The statements and related notes have been prepared for illustrative purposes only, based upon applicable rules of the Securities and Exchange Commission. The pro forma information does not purport to be indicative of what the combined company’s consolidated financial position or results of operations actually would have been had the Merger been completed as of the dates indicated. In addition, the unaudited pro forma combined condensed financial information does not purport to project the future financial position or operating results of the combined company. The pro forma adjustments, which are subject to uncertainties, are based on the information available at the time of the preparation of these pro forma financial statements and on the basis of certain assumptions and estimates.

Amounts in the unaudited pro forma financial information below may not foot due to immaterial rounding differences.

BLACK HILLS CORPORATION AND NORTHWESTERN ENERGY GROUP

UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME (LOSS)

FOR THE SIX MONTHS ENDED JUNE 30, 2026

Black Hills Corporation Historical

NorthWestern Energy Group Historical

Presentation Reclass

(Note 1)

Transaction Accounting Adjustments

Note 3

Pro Forma Condensed Combined

(in millions, except per share amounts)

Revenue

1,234

890

—

2,124

Operating expenses:

Fuel, purchased power and cost of natural gas sold

451

235

—

687

Operations and maintenance

299

154

—

541

Administrative and general

(88

)

—

Depreciation and amortization

150

134

—

284

Taxes other than income taxes

101

—

135

Total operating expenses

935

712

—

1,646

Operating income

299

178

—

477

Other income (expense):

Interest expense, net

(104

)

(80

)

—

(184

)

Other income (expense), net

—

Total other income (expense)

(103

)

(73

)

—

(175

)

Income before income taxes

196

106

—

302

Income tax (expense)

(23

)

(17

)

—

(40

)

Net income

174

—

262

Net income attributable to non-controlling interest

)

—

)

Net income available for common stock

169

258

Earnings per share of common stock:

Earnings per share, Basic

2.24

1.44

1.89

Earnings per share, Diluted

2.23

1.43

1.89

Weighted average common shares outstanding:

Basic

)

(A)

136

Diluted

)

(A)

136

BLACK HILLS CORPORATION AND NORTHWESTERN ENERGY GROUP

UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME (LOSS)

FOR THE YEAR ENDED DECEMBER 31, 2025

Black Hills Corporation Historical

NorthWestern Energy Group Historical

Presentation Reclass

(Note 1)

Transaction Accounting Adjustments

Note 3

Pro Forma Condensed Combined

(in millions, except per share amounts)

Revenue

2,310

1,611

—

3,921

Operating expenses:

Fuel, purchased power and cost of natural gas sold

832

410

—

1,241

Operations and maintenance

590

285

158

(B), (C)

1,066

Administrative and general

158

(158

)

—

Depreciation and amortization

284

250

—

533

Taxes other than income taxes

182

—

250

Total operating expenses

1,773

1,285

—

3,090

Operating income

538

326

—

(33

)

830

Other income (expense):

Interest expense, net

(200

)

(150

)

—

(351

)

Other income (expense), net

—

Total other income (expense)

(194

)

(138

)

—

(332

)

Income before income taxes

344

188

—

(33

)

498

Income tax benefit (expense)

(44

)

—

(D)

(44

)

Net income

300

181

—

(27

)

454

Net income attributable to non-controlling interest

)

—

)

Net income available for common stock

292

181

—

(27

)

446

Earnings per share of common stock:

Earnings per share, Basic

3.99

2.95

3.34

Earnings per share, Diluted

3.98

2.94

3.34

Weighted average common shares outstanding:

Basic

—

)

(A)

133

Diluted

—

)

(A)

133

BLACK HILLS CORPORATION AND NORTHWESTERN ENERGY GROUP

UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET

AS OF JUNE 30, 2026

Black Hills Corporation Historical

NorthWestern Energy Group Historical

Presentation Reclass

(Note 1)

Transaction Accounting Adjustments

Note 3

Pro Forma Condensed Combined

(in millions)

ASSETS

Current assets:

Cash, restricted cash and equivalents

—

(34

)

(E)

Accounts receivable, net

282

169

—

451

Materials, supplies and fuel

158

146

—

304

Regulatory assets, current

121

105

—

226

Other current assets

105

—

141

Total current assets

745

482

—

(34

)

1,193

Total property, plant and equipment, net

8,640

6,902

—

15,542

Other assets:

Goodwill

1,299

368

—

1,444

(F)

3,111

Regulatory assets, non-current

257

779

—

1,036

Other assets, non-current

173

—

270

Total other assets, non-current

1,653

1,320

—

1,444

4,417

TOTAL ASSETS

11,038

8,704

—

1,410

21,151

LIABILITIES AND EQUITY

Current liabilities:

Accounts payable

275

115

—

390

Accrued liabilities

271

297

—

567

Regulatory liabilities, current

—

121

Notes payable

100

—

190

Current maturities of long-term debt

410

—

455

Refundable advances for construction

285

—

285

Total current liabilities

1,425

583

—

2,008

Long-term debt, net of current maturities

3,994

3,442

—

7,436

Deferred credits and other liabilities:

Deferred income tax liabilities, net

742

761

—

(98

)

(G)

1,405

Regulatory liabilities, non-current

494

692

—

1,186

Other deferred credits and other liabilities

359

330

—

689

Total deferred credits and other liabilities

1,596

1,783

—

(98

)

3,281

Equity:

Stockholders’ equity -

Black Hills common stock, additional paid-in capital and treasury stock

2,545

—

4,430

(H)

6,975

NorthWestern common stock, additional paid-in capital and treasury stock

1,998

—

(1,998

)

(H)

Retained earnings

1,405

903

—

(930

)

(H)

1,378

Accumulated other comprehensive income (loss)

)

—

(H)

)

Total stockholders’ equity

3,943

2,895

—

1,508

8,346

Non-controlling interest

—

Total equity

4,024

2,895

—

1,508

8,427

TOTAL LIABILITIES AND TOTAL EQUITY

11,038

8,704

—

1,410

21,151

NOTES TO THE UNAUDITED PROFORMA CONDENSED COMBINED FINANCIAL STATEMENTS

(1) BASIS OF PROFORMA PRESENTATION

The unaudited pro forma combined condensed statements of income combine the Black Hills and NorthWestern historical consolidated income statements for the six months ended June 30, 2026 and the year ended December 31, 2025, giving effect to the Merger as if it were completed on January 1, 2025. The unaudited pro forma combined condensed balance sheet as of June 30, 2026 gives effect to the Merger as if it were completed on that date.

Black Hills’ and NorthWestern’s historical financial statements were prepared in accordance with U.S. GAAP and presented in U.S. dollars. Certain reclassifications have been made to NorthWestern’s historical presentation in order to conform to Black Hills’ historical presentation, as presented within the column titled “Presentation Reclass” in the pro forma balance sheet. Black Hills has not identified all adjustments necessary to conform NorthWestern’s accounting policies to Black Hills’ accounting policies. Upon completion of the Merger, or as more information becomes available, Black Hills will perform a more detailed review of NorthWestern’s accounting policies. As a result of that review, differences could be identified between the accounting policies of the two companies that, when conformed, could have a material impact on the combined company’s financial information. Further, there were no material transactions and balances between Black Hills and NorthWestern as of and for the six months ended June 30, 2026 and year ended December 31, 2025.

The accompanying unaudited pro forma condensed combined financial statements and related notes were prepared using the acquisition method of accounting under the provisions of ASC 805, with Black Hills considered the acquirer of NorthWestern. ASC 805 requires, among other things, that the assets acquired and liabilities assumed in a business combination be recognized at their fair values as of the acquisition date. For purposes of the unaudited pro forma condensed combined balance sheet, the purchase consideration has been allocated to the assets acquired and liabilities assumed of NorthWestern based upon management’s preliminary estimate of their fair values as of June 30, 2026. Black Hills has not completed the valuation analysis and calculations in sufficient detail necessary to arrive at the required estimates of the fair market value of the NorthWestern assets to be acquired or liabilities assumed. Accordingly, NorthWestern's assets and liabilities are presented at their respective carrying amounts and should be treated as preliminary fair values. Any differences between the fair value of the consideration transferred and the fair value of the assets acquired and liabilities assumed will be recorded as goodwill. Accordingly, the purchase price allocation and related adjustments reflected in these unaudited pro forma condensed combined financial statements are preliminary and subject to revision based on a final determination of fair value.

The unaudited pro forma financial statements are presented for illustration only and do not reflect anticipated cost savings (or associated costs to achieve such savings) from operating efficiencies or restructuring that could result from the Merger. Further, the pro forma financial statements do not reflect the effect of any regulatory actions that may impact the proforma financial statements when the Merger is completed.

(2) PRELIMINARY PURCHASE PRICE ALLOCATION

At the Effective Time, each share of NorthWestern Common Stock, issued and outstanding as of immediately prior to the Effective Time will be converted into the right to receive 0.98 validly issued, fully paid and non-assessable shares of Black Hills Common Stock (or cash in lieu of fractional shares thereof), in each case upon and subject to the terms and conditions of the Merger Agreement. For purposes of the unaudited pro forma condensed combined balance sheet, the estimated merger consideration is based on the total NorthWestern Common Stock issued and outstanding as of July 24, 2026 and the closing price per share of Black Hills Common Stock on August 12, 2026.

Refer to the table below for preliminary calculation of estimated merger consideration:

Amount in millions (except exchange ratio and price per share)

NorthWestern Common Stock issued and outstanding as of July 24, 2026

Exchange ratio

0.98

Black Hills Common Stock to be issued

Black Hills Common Stock price on August 12, 2026

73.16

Estimated value of Black Hills Common Stock to be issued to NorthWestern stockholders pursuant to the Merger Agreement

4,411

Estimated cash consideration attributable to the settlement of equity awards

Estimated equity consideration attributable to the settlement of equity awards

Estimated fair value of merger consideration

4,431

The cash and equity consideration attributable to the settlement of equity awards represents the estimated fair value of share-based compensation for NorthWestern’s vested and replaced awards related to pre-combination services. NorthWestern’s outstanding equity awards will vest or be replaced by Black Hills’ restricted stock equity awards in the manner specified in the Merger Agreement. The estimated fair value of estimated merger consideration will primarily depend on the market price of Black Hills Common Stock when the merger is consummated. The following table shows the effect of changes in Black Hills Common Stock price and the resulting impact on the estimated merger consideration (in millions, except per share data):

Stock Price Sensitivity

Black Hills Common Stock Price (Per Share)

Estimated fair value of merger consideration

Estimated Goodwill

As presented

73.16

4,431

1,811

10% increase

80.48

4,872

2,252

10% decrease

65.84

3,990

1,370

The preliminary estimated Merger consideration as shown in the tables above is allocated to the tangible assets acquired and liabilities assumed of NorthWestern based on their preliminary estimated fair values. As mentioned above in Note 1, Black Hills has not completed the valuation analysis and calculations in sufficient detail necessary to arrive at the required estimates of the fair market value of the NorthWestern assets to be acquired or liabilities assumed. Accordingly, assets acquired and liabilities assumed are presented at their respective carrying amounts and should be treated as preliminary fair values. The fair value assessments are preliminary and are based upon available information and certain assumptions, which Black Hills believes are reasonable under the circumstances. Actual results may differ materially from the assumptions within the unaudited pro forma condensed combined financial statements.

The following table sets forth a preliminary allocation of the estimated Merger consideration to the fair value of the identifiable tangible and intangible assets acquired and liabilities assumed of NorthWestern using NorthWestern’s unaudited consolidated balance sheet as of June 30, 2026, with the excess recorded to goodwill:

Amount (in millions)

Preliminary fair value of estimated total Merger consideration

4,431

Assets

Cash, restricted cash and equivalents

Accounts receivable, net

169

Materials, supplies and fuel

146

Regulatory assets, current

105

Other current assets

Total property, plant and equipment, net

6,902

Regulatory assets, non-current

779

Other assets, non-current

173

Total assets excluding existing goodwill

8,336

Liabilities

Accounts payable

(115

)

Accrued liabilities

(297

)

Regulatory liabilities, current

(27

)

Notes payable

(100

)

Current maturities of long-term debt

(45

)

Long-term debt, net of current maturities

(3,442

)

Deferred income tax liabilities, net

(669

)

Regulatory liabilities, non-current

(692

)

Other deferred credits and other liabilities

(330

)

Total liabilities

(5,716

)

Less: Net assets

2,620

Goodwill

1,811

(3) TRANSACTION ACCOUNTING ADJUSTMENTS

The transaction accounting adjustments included in the Unaudited Pro Forma Condensed Combined Statement of Income (Loss) and the Unaudited Pro Forma Condensed Combined Balance Sheet are as follows:

(A)

The pro forma basic and diluted earnings per share calculations are based on the basic and diluted weighted average shares of Black Hills plus shares issued as part of the Merger. The pro forma basic and diluted weighted average shares outstanding are a combination of historical weighted average shares of Black Hills Common Stock and the share impact as part of the Merger. The effect of converting certain equity awards held by NorthWestern employees into Bright Horizon Energy Corporation Common Stock is not considered material to the pro forma weighted average number of basic and diluted shares outstanding. Weighted average shares outstanding are as follows:

Pro forma weighted average shares (in millions)

Six Months ended June 30, 2026

Historical Black Hills weighted average shares outstanding - basic

Black Hills common shares to be issued pursuant to the Merger Agreement (Note 2)

Pro forma weighted average shares - basic

136

Historical Black Hills weighted average shares outstanding - diluted

Black Hills common shares to be issued pursuant to the Merger Agreement (Note 2)

Pro forma weighted average shares - diluted

136

(B)

Reflects estimated transaction-related costs of $25 million directly attributable to the merger, including investment banking fees, legal fees, consulting fees, and other transaction costs to be incurred by Black Hills. The adjustment was assumed to be recorded as Operation and maintenance expense on January 1, 2025. These non-recurring expenses are not anticipated to affect these Unaudited Pro Forma Condensed Combined Statements of Income (Loss) beyond twelve months after the closing date. For the six months ended June 30, 2026, Black Hills and NorthWestern incurred transaction costs of approximately $4 million and $2 million, respectively, directly attributable to the merger. For the year ended December 31, 2025, Black Hills and NorthWestern incurred transaction costs of approximately $10 million and $9 million, respectively, directly attributable to the merger.

(C)

Represents a non-recurring adjustment of $8 million for the acceleration of Black Hills' equity awards subject to preexisting change-in-control provisions that will become immediately vested upon the closing of the Merger. This $8 million is considered a transaction-related cost in addition to the amount described in (B). The adjustment was assumed to be recorded as Operation and maintenance expense on January 1, 2025. This adjustment will not have a continuing impact to the Unaudited Pro Forma Condensed Combined Statements of Income (Loss) beyond twelve months after the closing date.

(D)

Reflects $6 million for the income tax effects of pro forma adjustments in (B) and (C) above at the estimated combined statutory federal and state rate at 23%. For tax purposes related to adjustment (B) above, it is estimated that $18 million of transaction-related merger costs will be deductible and $8 million will be subject to capitalization.

(E)

Reflects the payment of $25 million for Black Hills estimated transaction-related merger costs. Also reflects payment of $9 million for the settlement of certain NorthWestern's outstanding Restricted Stock Unit awards granted prior to signing of the Merger Agreement that will become immediately vested upon the closing of the Merger.

(F)

Reflects an adjustment to goodwill based on the preliminary purchase price allocation discussed in Note 2 above:

Amount (in millions)

Fair value of consideration transferred in excess of the preliminary fair value of assets acquired and liabilities assumed (Note 2)

1,811

Removal of NorthWestern's historical goodwill

(368

)

Pro forma net adjustment to goodwill

1,444

(G)

Reflects an adjustment to deferred tax liabilities, net to remove $92 million of Northwestern's existing deferred tax liability related to goodwill and $6 million for the income tax effects of pro forma adjustments as described in (D) above.

(H)

Reflects adjustments to Black Hills and NorthWestern equity based on the following:

Black Hills common stock, additional paid-in capital and treasury stock

NorthWestern common stock, additional paid-in capital and treasury stock

Retained Earnings

Accumulated other comprehensive income (loss)

Total

Estimated value of Black Hills common shares to be issued to NorthWestern stockholders pursuant to the Merger Agreement

4,411

Removal of NorthWestern's historical stockholders' equity

(1,998

)

(903

)

(2,895

)

Estimated equity consideration attributable to the settlement of NorthWestern's equity awards

Adjustment for Black Hills estimated merger transaction costs, net of tax

(21

)

(21

)

Settlement of Black Hills' equity awards, net of tax

)

Total

4,430

(1,998

)

(930

)

1,508

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