NWE

EX-99.1

2 ex991pressreleaseq32026.htm

EX-99.1 EARNINGS RELEASE Q3 2026

Document

NorthWestern Energy Group, Inc.

d/b/a NorthWestern Energy

3010 W. 69th Street

Sioux Falls, SD 57108

www.northwesternenergy.com

FOR IMMEDIATE RELEASE

NorthWestern Energy Reports Third Quarter 2026 Financial Results

•Third Quarter 2026 Diluted GAAP EPS of $0.50, compared to $0.62 in 2025.

•Third Quarter 2026 Adjusted Diluted Non-GAAP EPS of $0.58, compared to $0.79 in 2025.

•Affirms 2026 earnings guidance range of $3.68 to $3.83 per diluted share.

•Affirms record $683 million capital plan for 2026 and 4% to 6% long-term EPS and rate base growth rate.

•Announces $0.67 per share quarterly dividend - payable December 1, 2026.

BUTTE, MT / SIOUX FALLS, SD - November 4, 2026 - NorthWestern Energy Group, Inc. d/b/a NorthWestern Energy (Nasdaq: NWE) reported financial results for the Third Quarter of 2026. Net income for the period was $30.7 million, or $0.50 per diluted share, as compared with net income of $38.2 million, or $0.62 per diluted share, for the same period in 2025. This decrease was primarily due to $6.1 million of net loss associated with our additional ownership interests in Colstrip Units 3 and 4, depreciation expense, and interest expense. These were offset in part by lower non-recoverable Montana electric supply costs, retail volumes, transmission revenue, and lower merger-related costs.

NorthWestern’s Third Quarter 2026 non-GAAP net income and diluted earnings per share were $35.6 million and $0.58, respectively, compared to $48.4 million and $0.79 in 2025. See “Adjusted Non-GAAP Earnings” and “Non-GAAP Financial Measures” sections below for more information on these measures.

"The third quarter was a busy and productive one for NorthWestern,” said President and CEO Brian Bird. “We continued to execute on our core business and remain focused on delivering long-term value for our customers, communities, and shareholders. Although the costs associated with our incremental ownership in Colstrip have created a temporary earnings headwind, this strategic decision helps ensure reliable energy for our customers and support economic development in Montana. Looking ahead, we are excited about the prospect of completing our merger with Black Hills and beginning the next chapter for our combined company, subject to final, satisfactory approval from the Montana Public Service Commission which is expected to consider the merger prior to November 12, 2026.”

NorthWestern Energy Reports Third Quarter 2026 Financial Results

November 4, 2026

Page 2

TRANSACTION UPDATE

On August 18, 2025, we entered into a Merger Agreement with Black Hills Corporation (Black Hills) and a wholly owned subsidiary of Black Hills. 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 new corporate name selected for the resulting parent company of the combined corporate group is Bright Horizon Energy Corporation (Bright Horizon).

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.

We filed an application with the Montana Public Service Commission (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.

During the three and nine months ended September 30, 2026, we have incurred $3.2 million and $9.9 million, respectively, of merger-related costs, which are included in our Administrative and general expenses.

FINANCIAL OUTLOOK

Affirming 2026 Guidance and Long-Term Growth Rates

As noted above, we anticipate completing the merger with Black Hills by year-end 2026. The financial guidance and long-term outlook presented below reflect NorthWestern Energy on a standalone basis. Upon completion of the merger, NorthWestern’s standalone guidance and outlook will no longer apply or be indicative of the combined company’s expected results.

We are affirming our 2026 non-GAAP earnings guidance of $3.68 - $3.83 per diluted share. This guidance is based upon, but not limited to, the following major assumptions:

•Normal weather in our service territories;

•Excludes costs related to the pending merger with Black Hills;

•Approval of the Power Cost and Credit Adjustment Mechanism (PCCAM) waiver and power prices sufficient to recover operating expense f

EX-99.1

2 ex991pressreleaseq22026.htm

EX-99.1 EARNINGS RELEASE Q2 2026

Document

NorthWestern Energy Group, Inc.

d/b/a NorthWestern Energy

3010 W. 69th Street

Sioux Falls, SD 57108

www.northwesternenergy.com

FOR IMMEDIATE RELEASE

NorthWestern Energy Reports Second Quarter 2026 Financial Results

•Second Quarter 2026 Diluted GAAP EPS of $0.40, compared to $0.35 in 2025.

•Second Quarter 2026 Adjusted Diluted Non-GAAP EPS of $0.50, compared to $0.40 in 2025.

•Affirms 2026 earnings guidance range of $3.68 to $3.83 per diluted share.

•Affirms record $683 million capital plan for 2026 and 4% to 6% long-term EPS and rate base growth rate.

•Announces $0.67 per share quarterly dividend - payable September 1, 2026.

•Received merger regulatory approval from Nebraska, South Dakota, and the Federal Energy Regulatory Commission (FERC).

BUTTE, MT / SIOUX FALLS, SD - July 29, 2026 - NorthWestern Energy Group, Inc. d/b/a NorthWestern Energy (Nasdaq: NWE) reported financial results for the Second Quarter of 2026. Net income for the period was $25.0 million, or $0.40 per diluted share, as compared with net income of $21.2 million, or $0.35 per diluted share, for the same period in 2025. This increase was primarily due to new rates and retail volumes. These were offset in part by operating, administrative, and general costs, including merger-related costs and costs associated with our additional ownership interests in Colstrip Units 3 and 4, depreciation expense, and interest expense.

NorthWestern’s Second Quarter 2026 non-GAAP net income and diluted earnings per share were $31.1 million and $0.50, respectively, compared to $24.1 million and $0.40 in 2025. See “Adjusted Non-GAAP Earnings” and “Non-GAAP Financial Measures” sections below for more information on these measures.

“We are pleased to report solid results for the quarter and exciting progress on the merger,” said President and CEO Brian Bird. “In May, we received merger approval from the Federal Energy Regulatory Commission and the Nebraska Public Service Commission followed by approval from the South Dakota Public Utilities Commission in June. That leaves Montana as the only remaining regulatory approval needed for the merger. A hearing with the Montana Public Service Commission was held in May and we await their final order. In the meantime, we remain focused on executing our strategic priorities, delivering safe, reliable, and affordable service to our customers, and integration planning to position the combined company for long-term success."

NorthWestern Energy Reports Second Quarter 2026 Financial Results

July 29, 2026

Page 2

TRANSACTION UPDATE

On August 18, 2025, we entered into a Merger Agreement with Black Hills Corporation and a wholly owned subsidiary of Black Hills. 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 new corporate name selected for the resulting parent company of the combined corporate group is Bright Horizon Energy.

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.

We filed an application with the Montana Public Service Commission (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.

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.

FINANCIAL OUTLOOK

Affirming 2026 Guidance and Long-Term Growth Rates

We are affirming our 2026 non-GAAP earnings guidance of $3.68 - $3.83 per diluted share. This guidance is based upon, but not limited to, the following major assumptions:

•Normal weather in our service territories;

•Excludes costs related to the pending merger with Black Hills Corp.;

•Approval of the Power Cost and Credit Adjustment Mechanism (PCCAM) waiver and power prices sufficient to recover operating expense from incremental Avista and Puget Colstrip interests;

•An effective income tax rate of approximately 14 percent to 18 percent; and

•Diluted average shares outstanding of approximately 61.8 million.

We are affirming our long-term diluted earnings per share growth guidance of 4% to 6%, based on our 2024 adjusted diluted non-GAAP EPS baseline of $

EX-99.1

2 ex991pressreleaseq12026.htm

EX-99.1 EARNINGS RELEASE Q1 2026

Document

NorthWestern Energy Group, Inc.

d/b/a NorthWestern Energy

3010 W. 69th Street

Sioux Falls, SD 57108

www.northwesternenergy.com

FOR IMMEDIATE RELEASE

NorthWestern Energy Reports First Quarter 2026 Financial Results

•First Quarter 2026 Diluted GAAP EPS of $1.03, compared to $1.25 in 2025.

•First Quarter 2026 Adjusted Diluted Non-GAAP EPS of $1.31, compared to $1.22 in 2025.

•Affirms 2026 earnings guidance range of $3.68 to $3.83 per diluted share.

•Affirms record $683 million capital plan for 2026 and 4% to 6% long-term EPS and rate base growth rate.

•Announces $0.67 per share quarterly dividend - payable June 30, 2026.

•Received shareholder approval of all merger proposals and reached constructive settlement agreements with certain key intervenors in Montana, Nebraska, and South Dakota.

BUTTE, MT / SIOUX FALLS, SD - April 29, 2026 - NorthWestern Energy Group, Inc. d/b/a NorthWestern Energy (Nasdaq: NWE) reported financial results for the First Quarter of 2026. Net income for the period was $63.5 million, or $1.03 per diluted share, as compared with net income of $76.9 million, or $1.25 per diluted share, for the same period in 2025. This decrease was primarily due to retail volumes, operating, administrative, and general costs, including merger-related costs and costs associated with our additional ownership interests in Colstrip Units 3 and 4, depreciation expense, and interest expense. These were offset in part by new rates, transmission revenues, and lower non-recoverable Montana electric supply costs.

NorthWestern’s First Quarter 2026 non-GAAP net income and diluted earnings per share were $80.6 million and $1.31, respectively, compared to $75.3 million and $1.22 in 2025. See “Adjusted Non-GAAP Earnings” and “Non-GAAP Financial Measures” sections below for more information on these measures.

“The first quarter included several important developments across our regulatory and strategic priorities,” said President and CEO Brian Bird. “In South Dakota, the signing of Senate Bill 36 into law provided greater clarity around wildfire‑related liabilities and strengthened our ability to manage risk associated with critical energy infrastructure, aligning South Dakota with similar wildfire liability protections enacted in Montana last year. In Montana, we also submitted our Large New Load tariff rule proposal to the Public Service Commission—an important step in protecting existing customers while supporting long‑term energy investment and economic development in the state. Additionally, earlier this week we executed a development agreement with Quantica Infrastructure to advance it’s Big Sky Digital Infrastructure campus outside of Billings, MT.

Bird continues, “We also made great progress on the merger. In March, we reached a constructive settlement agreement with the Public Advocate of Nebraska, followed by a hearing in early April. Also in April, both NorthWestern and Black Hills shareholders approved the merger proposals and we were able to reach constructive settlements with certain key intervenors in both Montana and South Dakota. Together, these milestones meaningfully advance us toward a targeted second‑half 2026 closing of the transaction."

NorthWestern Energy Reports First Quarter 2026 Financial Results

April 29, 2026

Page 2

TRANSACTION UPDATE

On August 18, 2025, we entered into a Merger Agreement with Black Hills Corporation and a wholly owned subsidiary of Black Hills. 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 new corporate name selected for the resulting parent company of the combined corporate group is Bright Horizon Energy.

We have filed applications with the Montana Public Service Commission (MPSC), Nebraska Public Service Commission (NPSC), South Dakota Public Utilities Commission (SDPUC), and Federal Energy Regulatory Commission (FERC) for approval of the Merger.

In March 2026, we reached a settlement agreement with the Public Advocate of Nebraska, which is subject to approval by the NPSC. A hearing with the NPSC was held in April 2026.

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 April 2026, we reached settlement agreements with certain key intervenors in both Montana and South Dakota, which are subject to approval by the MPSC and SDPUC, respectively. Hearings with the MPSC and SDPUC are scheduled in the second quarter of 2026.

We anticipate the transaction closing in the second half of 2026, subject to the satisfaction or waiver of certain closing conditions.

During the three months ended March 31, 2026, we have incurred $3.4 million of merger-related costs, which are included in our Administrative and