PORTLAND, ORE. — Northwest Natural Holding Company (NYSE: NWN) (NW Natural Holdings) reported financial results and highlights including:

•Reported a net loss of $0.73 per share for the third quarter of 2025, compared to a net loss of $0.71 per share for the same period in 2024

•Achieved net income of $1.36 per share and adjusted net income of $1.52 per share1 for the first nine months of 2025, compared to net income of $0.88 per share for the same period in 2024

•Added over 95,000 gas and water utility connections in the last 12 months for a combined growth rate of 10.9% as of September 30, 2025, mainly driven by the acquisition of SiEnergy

•Invested $333 million in our gas and water systems in the first nine months of 2025 to support growth and greater reliability and resiliency

•Successfully issued $185 million of inaugural, investment-grade bonds at SiEnergy, refinancing existing debt

•New rates went into effect on Oct. 31, 2025 related to NW Natural's Oregon general rate case and the Purchased Gas Adjustment (PGA) mechanism for Oregon and Washington customers, which includes estimated gas costs for the upcoming winter heating season

•Increased our dividend for the 70th consecutive year to an annual indicated dividend rate of $1.97 per share

•Expect 2025 results to be above the midpoint of our updated GAAP earnings per share (EPS) guidance range of $2.59 to $2.79 and adjusted EPS guidance of $2.75 to $2.951 as a result of strong performance

•Reaffirmed long-term EPS growth rate target of 4% to 6%1,2

"Driven by strong execution of our 2025 plan, we now expect EPS results to be above the midpoint of our guidance range," said Justin B. Palfreyman, President and CEO of NW Natural Holdings. "We continue to see the benefits of our strategic investments in Texas gas utilities and growth across our water and wastewater utilities. At the same time, we remain focused on operational excellence, maintaining and improving our systems and keeping affordability front and center for our customers. In fact, our NW Natural gas customers' bills are about the same as they were 20 years ago. Combined with over 70 consecutive years of dividend increases, this reflects our long-standing commitment to delivering value for customers and shareholders alike."

NW Natural Holdings' third quarter and year-to-date results are summarized below:

1 See "Non-GAAP Financial Measures", "2025 Guidance Reconciliation to GAAP", and "Q3 and YTD 2025 Reconciliation to GAAP" for a definition and further information on adjusted net income and adjusted EPS. Adjusted net income and adjusted EPS exclude transaction and business development costs including the effects of SiEnergy and Pines.

2 Adjusted EPS growth forecasted for period 2025 – 2030 compounded annually; EPS growth rate uses midpoint of adjusted 2025 EPS guidance range as base year. NW Natural Holdings does not provide a reconciliation of adjusted EPS growth rate target to the most directly comparable GAAP measures due to the inherent difficulty in forecasting and quantifying certain significant items. These items are uncertain, depend on various factors and could have a material impact on GAAP-reported results for the relevant period.

On Oct. 24, 2025, the Public Utility Commission of Oregon (OPUC) issued an order approving the all-party settlements in NW Natural's Oregon general rate case and resolving the remaining outstanding items. The order increased the revenue requirement by $20.7 million, or 2.0%, over current rates including final adjustments for capital projects placed into service and the depreciation study. The order included a capital structure of 50% common equity and 50% long-term debt, return on equity of 9.5%, and overall cost of capital of 7.12%. Rate base is approximately $2.3 billion, or an increase of $180.1 million, since the last rate case. New rates in Oregon were effective beginning Oct. 31, 2025.

On Aug. 29, 2025, NW Natural filed a request for a general rate increase with the Washington Utilities and Transportation Commission (WUTC). This multi-year rate plan filing seeks increases in annual revenue requirement over three years, consisting of a $25.6 million revenue increase in the first year beginning Aug. 1, 2026 (Year 1), an $8.6 million revenue increase in the second year beginning Aug. 1, 2027 (Year 2), and an $8.3 million revenue increase in the third year beginning Aug. 1, 2028 (Year 3). The request included a capital structure of 51% common equity, 48% long-term debt, and 1% short-term debt. In addition, it included a request for a return on equity of 10.1% in Year 1 and 10.2% in Year 2 and Year 3.

This is NW Natural's first general rate case since 2021 and the filing reflects the effects of inflation, an updated depreciation study, and long-planned investments primarily supporting system safety and reliability. The process is anticipated to take up to 11 months with new rates expected to take effect Aug. 1, 2026.

NW Natural Holdings expects 2025 results to be above the midpoint of its updated 2025 GAAP EPS guidance of $2.59 to $2.79, which was updated as a result of transaction and business development costs. NW Natural Holdings also expects to be above the midpoint of its reaffirmed adjusted EPS guidance of $2.75 to $2.95 on a non-GAAP1 basis excluding the $9.1 million pre-tax transaction and business development costs, including the acquisitions of SiEnergy and Pines gas utilities (approximately $6.7 million or $0.16 per share after-tax2). This guidance assumes continued customer growth, average weather conditions, and no significant changes in prevailing regulatory policies, mechanisms, or assumed outcomes, or significant local, state or federal laws, legislation or regulations.

NW Natural Holdings reaffirmed its long-term EPS growth rate target of 4% to 6% compounded annually from the midpoint of the adjusted 2025 EPS guidance range3.

NW Natural Holdings expects capital expenditures for 2025 to be in the range of $450 – $500 million. The timing and amount of the capital expenditures and projects for 2025 or additional investments in our infrastructure during or after 2025 could change based on customer growth, significant changes in prevailing regulatory policies or outcomes, or significant local, state or federal laws, legislation or regulations, or cost estimates. Required funds for the investments are expected to be internally generated or financed with long-term debt or equity, as appropriate.

The board of directors of NW Natural Holdings declared a quarterly dividend of $0.4925 per share on the Company’s common stock. The dividend is payable on Nov. 14, 2025 to shareholders of record on Oct. 31, 2025. The Company's current indicated annual dividend rate is $1.97 per share. Future dividends are subject to board of director discretion and approval.

1 See "Non-GAAP Financial Measures" and "2025 Guidance Reconciliation to GAAP" for a definition and further information on adjusted EPS. Adjusted EPS excludes transaction and business development costs, including the effects of SiEnergy and Pines.

2 Effect on EPS assumes average diluted shares of 40.9 million and an income tax rate of 26.5%.

3 Adjusted EPS growth forecasted for period 2025 – 2030 compounded annually; EPS growth rate uses midpoint of adjusted 2025 EPS guidance range as base year. NW Natural Holdings does not provide a reconciliation of adjusted EPS growth rate target to the most directly comparable GAAP measures due to the inherent difficulty in forecasting and quantifying certain significant items. These items are uncertain, depend on various factors and could have a material impact on GAAP-reported results for the relevant period.

NW Natural Holdings' third quarter results are summarized by business segment in the table below:

NW Natural Holdings' year-to-date results are summarized by business segment in the table below:

1 Segment EPS is a non-GAAP financial measure, which takes segment net income calculated in accordance with GAAP and divides it by the diluted shares outstanding of NW Natural Holdings. See "Non-GAAP Financial Measures" for additional information. The reconciliation of segment EPS to Consolidated NW Natural Holdings EPS is shown in the tables above.

2 See "Non-GAAP Financial Measures" and "Q3 and YTD 2025 Reconciliation to GAAP" for additional information. Adjusted 2025 other and consolidated net income are non-GAAP financial measures and exclude transaction costs and business development costs including the effects of SiEnergy and Pines. Non-GAAP financial measures should not be considered a substitute for, or superior to, measures calculated in accordance with U.S. GAAP. Non-GAAP financial measures are used to analyze our financial performance because we believe they provide useful information to our investors and creditors in evaluating our financial condition and results of operations.

NWN Gas Utility is a regulated utility principally engaged in the delivery of natural gas to customers in Oregon and southwest Washington. The segment also includes the portion of the Mist underground storage facility used to serve gas utility customers, the North Mist gas storage operations, and renewable natural gas development and procurement for the utility.

1 See "Non-GAAP Financial Measures" for additional information and the tables under "Third Quarter Results" and "Year-To-Date Results" for a reconciliation to Consolidated NW Natural Holdings EPS. Segment EPS is a non-GAAP financial measure, which takes NWN Gas Utility segment net income calculated in accordance with GAAP and divides it by the diluted shares outstanding of NW Natural Holdings.

Third Quarter Results: NWN Gas Utility net loss increased $0.6 million (or improved $0.04 on a per share basis). Margin increased $12.5 million primarily due to an increase from the Oregon rate case effective Nov. 1 2024. Operations and maintenance expense increased $7.8 million due to higher payroll and benefit expense and non-payroll costs including increased contractor expenses. Depreciation and general taxes collectively increased by $6.4 million primarily due to continued investment in our system. Income taxes decreased $1.0 million dollars due to lower pre-tax results.

Year-to-Date Results: NWN Gas Utility net income increased $25.4 million (or $0.58 per share) primarily reflecting new rates in Oregon. Margin increased $68.1 million primarily due to an increase from the Oregon rate case. Operations and maintenance expense increased $16.4 million primarily due to higher payroll and benefit expense. Depreciation and general taxes collectively increased by $15.9 million primarily due to continued investment in our system. Income taxes increased $9.6 million dollars due to higher pre-tax results.

SiEnergy Gas Utility (or SiEnergy) is a regulated natural gas distribution utility serving customers in the greater metropolitan areas of Houston, Dallas, and Austin, Texas.

1 See "Non-GAAP Financial Measures" for additional information and the tables under "Third Quarter Results" and "Year-To-Date Results" for a reconciliation to Consolidated NW Natural Holdings EPS. Segment EPS is a non-GAAP financial measure, which takes SiEnergy Gas Utility segment net income calculated in accordance with GAAP and divides it by the diluted shares outstanding of NW Natural Holdings.

Third Quarter and Year-to-Date Results: SiEnergy was acquired on Jan. 7, 2025, and Pines was acquired on June 2, 2025. Since their respective acquisition dates, these entities provided net income of $1.6 million (or $0.04 per share) in the third quarter of 2025 and net income of $8.1 million (or $0.20 per share) in the first nine months of 2025. Margin results met management's expectations and reflected strong customer growth during the third quarter and first nine months of 2025.

NWN Water Utility (or NWN Water) provides water distribution and wastewater services to communities throughout the Pacific Northwest, Texas, Arizona, and California.

1 See "Non-GAAP Financial Measures" for additional information and the tables under "Third Quarter Results" and "Year-To-Date Results" for a reconciliation to Consolidated NW Natural Holdings EPS. Segment EPS is a non-GAAP financial measure which takes NWN Water Utility segment net income calculated in accordance with GAAP and divides it by the diluted shares outstanding of NW Natural Holdings.

Third Quarter Results: NWN Water net income increased $2.1 million (or $0.04 per share) mainly reflecting a $3.2 million increase in operating revenues primarily due to new rates at its largest utility in Arizona and incremental revenues from the Infrastructure Capital Holdings/Puttman (ICH) water utilities after the acquisition in September 2024. Operating expenses were stable. Income taxes increased $0.7 million dollars due to higher pre-tax results.

Year-to-Date Results: NWN Water net income increased $6.3 million (or $0.14 per share) mainly reflecting an $11.2 million increase in operating revenues primarily due to new rates for its Arizona utilities and incremental revenues from the ICH water utilities acquisition. Operations and maintenance expense increased $3.6 million primarily due to the addition of ICH activities in results. Income taxes increased $2.3 million dollars due to higher pre-tax results.

Other business activities are reported through "Other" results and primarily include Interstate Storage Services and third-party asset management services for the Mist facility in Oregon; NWN Renewables, which is a renewable fuels business; and corporate financing activities, consolidation entries, and other activities.

1 See "Non-GAAP Financial Measures" for additional information and the tables under "Third Quarter Results" and "Year-To-Date Results" for a reconciliation to Consolidated NW Natural Holdings EPS. Segment EPS is a non-GAAP financial measure, which takes Other net income calculated in accordance with GAAP and divides it by the diluted shares outstanding of NW Natural Holdings.

2 See "Non-GAAP Financial Measures" and "Q3 and YTD 2025 Reconciliation to GAAP" for additional information. Adjusted 2025 other and consolidated net income are non-GAAP financial measures and exclude transaction costs and business development costs including the effects of SiEnergy and Pines.

Third Quarter Results: The net loss from the Company's other business activities increased $5.8 million (or $0.14 per share). The increase in the net loss was primarily due to higher interest expense mainly from the issuance of junior subordinated notes in March 2025.

Year-to-Date Results: The net loss from the Company's other business activities increased $18.1 million (or $0.44 per share). On an adjusted basis, the net loss increased $11.4 million ($0.28 per share), which excludes transaction expenses and business development costs. The increase in the adjusted net loss was primarily related to higher interest expense primarily due to incremental financings at NW Natural Holdings in December 2024 and March 2025.

As previously announced, NW Natural Holdings will host a conference call and webcast today to discuss its third quarter 2025 financial and operating results.

The call will also be webcast in a listen-only format for the media and general public and can be accessed at ir.nwnaturalholdings.com. A replay of the conference call will be available on our website and by dialing 1-866-813-9403 and a replay access code of 947196.

Northwest Natural Holding Company (NYSE: NWN) (NW Natural Holdings) is headquartered in Portland, Oregon and has been doing business for over 166 years. It owns Northwest Natural Gas Company (NW Natural), SiEnergy Operating, LLC (SiEnergy Gas Utility), NW Natural Water Company (NWN Water Utility), NW Natural Renewables Holdings (NWN Renewables), and other business interests.

NW Natural Holdings through its subsidiaries provides critical energy and delivers essential water and wastewater services to over one million meters across seven states. We have a longstanding commitment to safety, environmental stewardship, and taking care of our employees and communities. NW Natural Holdings was recognized by Ethisphere® for four years running as one of the World’s Most Ethical Companies®. NW Natural consistently leads the industry with high J.D. Power & Associates customer satisfaction scores.

NW Natural through its gas utility, NWN Gas Utility, is a local distribution company that currently provides service to approximately 2 million people in more than 140 communities through approximately 806,000 meters in Oregon and Southwest Washington with one of the most modern pipeline systems in the nation. NW Natural owns and operates 21.6 Bcf of underground gas storage capacity in Oregon.

SiEnergy Gas Utility is one of the fastest growing natural gas distribution utilities in the nation, serving nearly 87,000 meters in the greater metropolitan areas of Houston, Dallas, and Austin, Texas.

NWN Water Utility provides water distribution and wastewater services to communities throughout the Pacific Northwest, Texas, Arizona, and California. Today NW Natural Water serves an estimated 197,000 people through approximately 79,000 meters and provides operation and maintenance services to an additional 38,000 connections. Learn more about our water business at nwnaturalwater.com.

NWN Renewables is committed to leading in the energy transition by providing renewable fuels. Learn more at nwnaturalrenewables.com.

Additional information is available at nwnaturalholdings.com.

Investor Contact:

Nikki Sparley

Phone: 503-721-2530

Email: nikki.sparley@nwnatural.com

Media Contact:

David Roy

Phone: 503-610-7157

Email: david.roy@nwnatural.com

This press release, and other presentations made by NW Holdings from time to time, may contain forward-looking statements within the meaning of the U.S. Private Securities Litigation Reform Act of 1995. Forward-looking statements can be identified by words such as "anticipates," "assumes," “continues,” “could,” "intends," "plans," "seeks," "believes," "estimates," "expects," "forecasts," "will" and similar references to future periods. Examples of forward-looking statements include, but are not limited to, statements regarding the following: plans, objectives, assumptions, estimates, expectations, forecasts, outlooks, timing, goals, strategies, commitments, future events, financial positions, financial performance, investments, valuations, timing and amount of capital expenditures, targeted capital structure, risks, risk profile, stability, acquisitions and timing, approval, completion and integration thereof, the likelihood and success associated with any transaction, strategic fit, utility system, technology and infrastructure investments, system modernization, reliability and resiliency, global, national and local economies, economic and GDP growth, customer and business growth, continued expansion of service territories, rate base growth, customer backlog, growth opportunities, customer satisfaction ratings, weather, performance and service during weather events, customer rates or rate recovery and the timing and magnitude of potential rate changes and the potential outcome of rate cases, environmental remediation cost recoveries, environmental initiatives, decarbonization and the role of natural gas and the gas delivery system, including decarbonization goals and timelines, energy efficiency measures, use of renewable sources, renewable natural gas purchases, projects, investments and other renewable initiatives, and timing, magnitude and completion thereof, unregulated renewable natural gas strategy and initiatives, hydrogen projects or investments and timing, magnitude, approvals and completion thereof, procurement of renewable natural gas or hydrogen for customers, technology and policy innovations, strategic goals and visions, water, wastewater and water services acquisitions, personnel additions, partnerships, investment strategy, regulatory strategy, and financial effects of water, wastewater and water services acquisitions, expected growth and safety benefits of facility upgrade investments, operating plans of third parties, financial targets, financial results, including estimated income, availability and sources of liquidity, capital markets, financing transactions, expenses, positions, revenues, returns, cost of capital, timing, and earnings, earnings guidance and estimated future growth rates, credit ratings, debt and equity issuances and timing, future dividends, commodity costs and sourcing, asset management activities, regulatory environment, performance, timing, outcome, or effects of regulatory proceedings or mechanisms or approvals, rate case execution, regulatory prudence reviews, anticipated regulatory actions or filings, accounting treatment of future events, economic and political conditions, effects of legislation or changes in laws or regulations, impact of the current U.S. presidential administration and Congress, effects, extent, the imposition or announcement of tariffs or trade restrictions, impacts of the U.S. federal government shutdown, inflation, geopolitical uncertainty and other statements that are other than statements of historical facts.

Forward-looking statements are based on current expectations and assumptions regarding its business, the economy, geopolitical factors, and other future conditions. Because forward-looking statements relate to the future, they are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict. Actual results may differ materially from those contemplated by the forward-looking statements. You are therefore cautioned against relying on any of these forward-looking statements. They are neither statements of historical fact nor guarantees or assurances of future operational, economic or financial performance. Important factors that could cause actual results to differ materially from those in the forward-looking statements are discussed by reference to the factors described in Part I, Item 1A "Risk Factors", and Part II, Item 7 and Item 7A "Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Quantitative and Qualitative Disclosure about Market Risk" in the most recent Annual Report on Form 10-K and in Part I, Items 2 and 3 "Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Quantitative and Qualitative Disclosures About Market Risk", and Part II, Item 1A, "Risk Factors", in the quarterly reports filed thereafter, which, among others, outline legal, regulatory and legislative risks, financial, macroeconomic and geopolitical risks, growth and strategic risks, operational risks, business continuity and technology risks, environmental risks and risks related to our water and renewables businesses.

Management uses "adjusted net income", "adjusted earnings per share," "adjusted segment net loss," "segment earnings per share” and "adjusted segment earnings per share," each of which are non-GAAP financial measures, when evaluating NW Natural Holdings' overall performance. Management uses non-GAAP measures in making operating decisions because we believe those measures provide meaningful supplemental information regarding our earning potential and performance for management by excluding certain expenses and charges that may not be indicative of our core business operating results and can affect the comparison of period-over-period results. These adjustments may include transaction and business development costs primarily consisting of professional fees including legal, accounting, financial and other professional fees incurred in connection with business combinations and business development activities. In addition to presenting the results of operations and earnings amounts in total, certain financial measures are expressed in cents per share, which are non-GAAP financial measures. All references to EPS are on the basis of diluted shares.

Such non-GAAP financial measures are used to analyze our financial performance because we believe they provide useful information to our investors and creditors in evaluating our financial condition and results of operations. Our non-GAAP financial measures should not be considered a substitute for, or superior to, measures calculated in accordance with U.S. GAAP. Moreover, these non-GAAP financial measures have limitations in that they do not reflect all the items associated with the operations of the business as determined in accordance with GAAP. Other companies may calculate similarly titled non-GAAP financial measures differently than how such measures are calculated in this report, limiting the usefulness of those measures for comparative purposes. A reconciliation of each non-GAAP financial measure to the most directly comparable GAAP financial measure is provided in the tables below.

1 Effect on EPS assumes transaction and business development costs, including the effects of SiEnergy and Pines. Estimated costs of $6.7 million after-tax for 2025, average diluted shares of 40.9 million and an income tax rate of 26.5%.

2 See "Non-GAAP Financial Measures" for a definition and further information on adjusted EPS.

1 SiEnergy transaction expenses were recognized in the first quarter of 2025 and Pines transaction expenses were recognized in the second quarter of 2025. Other business development costs were recognized in the second and third quarter of 2025. Tax effect of adjustment was calculated using a combined federal and statutory rate of 26.5%.