Duke Energy (DUK) Q1 2026 Earnings

(a)    Total EPS adjustments may not foot due to rounding.

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Duke Energy News Release    4

Non-GAAP financial measures

Management evaluates financial performance in part based on non-GAAP financial measures, including adjusted earnings, adjusted EPS and adjusted effective tax rate. Adjusted earnings and adjusted EPS represent income (loss) from continuing operations available to Duke Energy Corporation common stockholders in dollar and basic per share amounts, adjusted for the dollar and per share impact of special items. The adjusted effective tax rate is calculated using pretax earnings and income tax expense, both adjusted to include the impact of noncontrolling interests and preferred dividends and to exclude the impact of special items. Special items represent certain charges and credits, which management believes are not indicative of Duke Energy's ongoing performance.

Special items included within the financial statement periods presented, which management does not believe are reflective of ongoing costs, are described below:

•Legal and Regulatory Settlements represent the impact of charges related to legal settlements as well as regulatory matters related to the establishment of a regulatory liability associated with an energy efficiency program at Duke Energy Carolinas and Duke Energy Progress.

•Asset Sales represent the impact of gains on sale of assets related to Piedmont's Tennessee business and certain renewable natural gas investments.

Management uses these non-GAAP financial measures for planning, forecasting, and to report financial results to the Board of Directors, employees, and stockholders, as well as analysts and investors. The most directly comparable GAAP measures for adjusted earnings, adjusted EPS and the adjusted effective tax rate are Net Income (Loss) Available to Duke Energy Corporation common stockholders (GAAP reported earnings (loss)), Basic earnings (loss) per share Available to Duke Energy Corporation common stockholders (GAAP reported earnings (loss) per share), and the reported effective tax rate, respectively.

Due to the forward-looking nature of forecasted adjusted EPS and related growth rates, the information to reconcile those amounts to the most directly comparable GAAP financial measure is not available, as management is unable to project special items, such as legal settlements, impacts of regulatory orders or asset impairments, for future periods.

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Duke Energy News Release    5

Management evaluates segment performance based on segment income and other net loss. Segment income and other net loss are defined as income (loss) from continuing operations net of income attributable to noncontrolling interests and preferred stock dividends. Segment income and other net loss include intercompany revenues and expenses that are eliminated in the Condensed Consolidated Financial Statements. Management also uses adjusted segment income and adjusted other net loss as measures of historical and anticipated future segment performance. Adjusted segment income and adjusted other net loss are non-GAAP financial measures, as they represent segment income and other net loss adjusted for special items, as discussed above. Management believes the presentation of adjusted segment income and adjusted other net loss provide useful information to investors, as they provide additional relevant comparison of a segment’s or Other's performance across periods. The most directly comparable GAAP measures for adjusted segment income and adjusted other net loss are segment income and other net loss.

Due to the forward-looking nature of forecasted adjusted segment income and forecasted adjusted other net loss and related growth rates, the information to reconcile these amounts to the most directly comparable GAAP financial measures are not available, as management is unable to project special items, as discussed above.

Duke Energy’s adjusted earnings, adjusted EPS, adjusted effective tax rate, adjusted segment income, and adjusted other net loss may not be comparable to similarly titled measures of another company because other companies may not calculate the measures in the same manner.

Duke Energy

Duke Energy (NYSE: DUK), a Fortune 150 company headquartered in Charlotte, N.C., is one of America’s largest energy holding companies. The company's electric utilities serve 8.7 million customers in North Carolina, South Carolina, Florida, Indiana, Ohio and Kentucky, and collectively own 55,700 megawatts of energy capacity. Its natural gas utilities serve 1.6 million customers in North Carolina, South Carolina, Ohio and Kentucky.

Duke Energy is executing an energy modernization strategy, keeping customer value at the forefront as it invests in electric grid upgrades and efficient generation resources to strengthen the system and serve growing energy needs.

More information is available at duke-energy.com. Follow Duke Energy on X, LinkedIn, Instagram, TikTok and Facebook for stories about the people and innovations powering its communities.

Forward-Looking Information

This document includes forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Forward-looking statements are based on management’s beliefs and assumptions and can often be identified by terms and phrases that include “anticipate,” “believe,” “intend,” “estimate,” “expect,” “continue,” “should,” “could,” “may,” “plan,” “project,” “predict,” “will,” “potential,” “forecast,” “target,” “guidance,” “outlook” or other similar terminology. Various factors may cause actual results to be materially different than the suggested outcomes within forward-looking statements; accordingly, there is no assurance that such results will be realized. These factors include, but are not limited to:

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Duke Energy News Release    6

◦The ability to implement our business strategy, including meeting forecasted load growth demand, grid and fleet modernization objectives, and reducing carbon emissions, while balancing customer reliability and keeping costs as low as possible for our customers;

◦State, federal and foreign legislative and regulatory initiatives, including costs of compliance with existing and future environmental requirements and/or uncertainty of applicability or changes to such legislative and regulatory initiatives, including those related to climate change, as well as rulings that affect cost and investment recovery or have an impact on rate structures or market prices;

◦The extent and timing of costs and liabilities to comply with federal and state laws, regulations and legal requirements related to coal ash remediation, including amounts for required closure of certain ash impoundments, are uncertain and difficult to estimate;

◦The ability to timely recover eligible costs, including amounts associated with coal ash impoundment retirement obligations, asset retirement and construction costs related to carbon emissions reductions, and costs related to significant weather events, particularly in periods of heightened customer affordability concerns, bill volatility, or public and political scrutiny, and to earn an adequate return on investment through rate case proceedings and the regulatory process;

◦The costs of decommissioning nuclear facilities could prove to be more extensive than amounts estimated and all costs may not be fully recoverable through the regulatory process;

◦The impact of extraordinary external events, such as a global pandemic, trade wars or military conflict, and their collateral consequences, including the disruption of global supply chains or the economic activity in our service territories;

◦Costs and effects of legal and administrative proceedings, settlements, investigations and claims;

◦Industrial, commercial and residential decline in service territories or customer bases resulting from sustained downturns of the economy, storm damage, reduced customer usage due to cost pressures from inflation, tariffs, or fuel costs, worsening economic health of our service territories, reductions in customer usage patterns, or lower than anticipated load growth, particularly if usage of electricity by data centers is less than currently projected, energy efficiency efforts, natural gas building and appliance electrification, and use of alternative energy sources, such as self-generation and distributed generation technologies;

◦Federal and state regulations, laws and other efforts designed to promote and expand the use of energy efficiency measures, natural gas electrification, and distributed generation technologies, such as private solar and battery storage, in Duke Energy service territories could result in a reduced number of customers, excess generation resources as well as stranded costs;

◦Advancements in technology, including artificial intelligence;

◦Additional competition in electric and natural gas markets, municipalization and continued industry consolidation;

◦The influence of weather and other natural phenomena on operations, financial position, and cash flows, including the economic, operational and other effects of severe storms, hurricanes, droughts, earthquakes and tornadoes, including extreme weather associated with climate change;

◦Changing or conflicting investor, customer and other stakeholder expectations and demands, particularly regarding environmental, social and governance matters and costs related thereto;

◦The ability to successfully operate electric generating facilities and deliver electricity to customers, including direct or indirect effects to the company resulting from an incident that affects the United States electric grid or generating resources;

◦Operational interruptions to our natural gas distribution and transmission activities;

◦The availability of adequate interstate pipeline transportation capacity and natural gas supply;

◦The impact on facilities and business from a terrorist or other attack, war, vandalism, cybersecurity threats, data security breaches, operational events, information technology failures or other catastrophic events, such as severe storms, fires, explosions, pandemic health events or other similar occurrences;

◦The inherent risks associated with the operation of nuclear facilities, including environmental, health, safety, regulatory and financial risks, including the financial stability of third-party service providers;

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Duke Energy News Release    7

◦The timing and extent of changes in commodity prices, including any impact from increased tariffs, export controls and interest rates, and the ability to timely recover such costs through the regulatory process, where appropriate, and their impact on liquidity positions and the value of underlying assets;

◦The results of financing efforts, including the ability to obtain financing on favorable terms, which can be affected by various factors, including credit ratings, interest rate fluctuations, compliance with debt covenants and conditions, an individual utility’s generation portfolio, and general market and economic conditions;

◦Credit ratings of the Duke Energy Registrants may be different from what is expected;

◦Declines in the market prices of equity and fixed-income securities and resultant cash funding requirements for defined benefit pension plans, other post-retirement benefit plans and nuclear decommissioning trust funds;

◦Construction and development risks associated with the completion of the Duke Energy Registrants’ capital investment projects, including risks related to financing, timing and receipt of necessary regulatory approvals, obtaining and complying with terms of permits, meeting construction budgets and schedules, obtaining sufficient skilled labor and satisfying operating and environmental performance standards, as well as the ability to recover costs from customers in a timely manner, or at all;

◦Changes in rules for regional transmission organizations, including changes in rate designs and new and evolving capacity markets, and risks related to obligations created by the default of other participants;

◦The ability to control operation and maintenance costs;

◦The level of creditworthiness of counterparties to transactions;

◦The ability to obtain adequate insurance at acceptable costs and recover on claims made;

◦Employee workforce factors, including the potential inability to attract and retain key personnel;

◦The ability of subsidiaries to pay dividends or distributions to Duke Energy Corporation holding company (the Parent);

◦The performance of projects undertaken by our businesses and the success of efforts to invest in and develop new opportunities;

◦The effect of accounting and reporting pronouncements issued periodically by accounting standard-setting bodies and the SEC;

◦The impact of United States tax legislation to our financial condition, results of operations or cash flows and our credit ratings;

◦The impacts from potential impairments of goodwill or investment carrying values;

◦Asset or business acquisitions and dispositions may not be consummated or yield the anticipated benefits, which could adversely affect our financial condition, credit metrics or ability to execute strategic and capital plans; and

◦The actions of activist shareholders could disrupt our operations, impact our ability to execute on our business strategy, or cause fluctuations in the trading price of our common stock.

Additional risks and uncertainties are identified and discussed in the Duke Energy Registrants' reports filed with the SEC and available at the SEC's website at sec.gov. In light of these risks, uncertainties and assumptions, the events described in the forward-looking statements might not occur or might occur to a different extent or at a different time than described. Forward-looking statements speak only as of the date they are made and the Duke Energy Registrants expressly disclaim an obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

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DUKE ENERGY CORPORATION

REPORTED TO ADJUSTED EARNINGS RECONCILIATION

Three Months Ended March 31, 2026

(Dollars in millions, except per share amounts)

Note: Total EPS adjustments do not cross-foot due to rounding.

A – $197 million total pretax recorded at Duke Energy Carolinas and Duke Energy Progress within Operations, maintenance and other and Operating Revenues on the Condensed Consolidated Statements of Operations for legal settlements as well as regulatory matters related to the establishment of a regulatory liability associated with an energy efficiency program. The segment income amount for these items are net of a $47 million tax benefit.

B – Net of $196 million tax expense which includes the impact of nondeductible goodwill related to the sale of Piedmont's Tennessee business.

•$368 million recorded within Gains on Sales of Other Assets and Other, net, and $7 million recorded within Property and other taxes on the Condensed Consolidated Statements of Operations related to the sale of Piedmont's Tennessee business.

•$6 million recorded within Gains on Sales of Other Assets and Other, net on the Condensed Consolidated Statements of Operations related to the sale of certain renewable natural gas investments.

C – Recorded in Income from Discontinued Operations, net of tax, on the Condensed Consolidated Statements of Operations.

Weighted Average Shares, basic (reported and adjusted) – 778 million

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DUKE ENERGY CORPORATION

REPORTED TO ADJUSTED EARNINGS RECONCILIATION

Three Months Ended March 31, 2025

(Dollars in millions, except per share amounts)

Weighted Average Shares, basic (reported and adjusted) – 777 million

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DUKE ENERGY CORPORATION

EFFECTIVE TAX RECONCILIATION

March 2026

(Dollars in millions)

(a)    Income tax related to non-pass-through entities for tax purposes.

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DUKE ENERGY CORPORATION

EARNINGS VARIANCES

March 2026 YTD vs. Prior Year

(a)    Includes block and seasonal pricing.

(b)    Electric Utilities and Infrastructure includes transmission revenues and higher grid modernization riders. Gas Utilities and Infrastructure includes customer growth in North Carolina and South Carolina.

(c)    Electric Utilities and Infrastructure includes impacts from DEI rates, effective February 2025 (+$0.04), DEC North Carolina Year 3 rates, effective January 2026, and DEC South Carolina rates, effective March 2026 (+$0.03), DEF Year 2 rates, effective January 2026 (+$0.03) DEP North Carolina Year 3 rates, effective October 2025, and DEP South Carolina rates, effective February 2026 (+$0.02) and DEK rates, effective July 2025 (+$0.01). Gas Utilities and Infrastructure includes impacts from DEK rates, effective January 2026.

(d)    Electric Utilities and Infrastructure includes higher storm costs (-$0.04), increased environmental reserves, and higher grid maintenance and generation outage costs in the current year.

(e)    Electric Utilities and Infrastructure excludes rate case impacts.

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DUKE ENERGY CORPORATION

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited)

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DUKE ENERGY CORPORATION

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

(Unaudited)

(a)    See Reported to Adjusted Earnings Reconciliation for a detailed reconciliation of Segment Income/Other Net Loss to Adjusted Earnings.

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DUKE ENERGY CORPORATION

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

(Unaudited)

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DUKE ENERGY CORPORATION

CONDENSED CONSOLIDATING BALANCE SHEETS – ASSETS

(Unaudited)

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DUKE ENERGY CORPORATION

CONDENSED CONSOLIDATING BALANCE SHEETS – LIABILITIES AND EQUITY

(Unaudited)

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ELECTRIC UTILITIES AND INFRASTRUCTURE

CONDENSED CONSOLIDATING SEGMENT INCOME

(Unaudited)

(a)    Includes results of the wholly owned subsidiary, Duke Energy Kentucky.

(b)    Includes an equity component of allowance for funds used during construction of $41 million for Duke Energy Carolinas, $27 million for Duke Energy Progress, $3 million for Duke Energy Florida, $3 million for Duke Energy Ohio and $9 million for Duke Energy Indiana.

(c)    Includes a noncontrolling interest in Duke Energy Indiana and Florida Progress.

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ELECTRIC UTILITIES AND INFRASTRUCTURE

CONDENSED CONSOLIDATING BALANCE SHEETS – ASSETS

(Unaudited)

(a)    Includes balances of the wholly owned subsidiary Duke Energy Kentucky.

(b)    Includes the elimination of intercompany balances, purchase accounting adjustments, and Duke Energy Indiana Holdco, LLC balances.

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ELECTRIC UTILITIES AND INFRASTRUCTURE

CONDENSED CONSOLIDATING BALANCE SHEETS – LIABILITIES AND EQUITY

(Unaudited)

(a)    Includes balances of the wholly owned subsidiary Duke Energy Kentucky.

(b)    Includes the elimination of intercompany balances, purchase accounting adjustments and Duke Energy Indiana Holdco, LLC balances.

(c)    Includes a noncontrolling interest in Duke Energy Indiana and Florida Progress.

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GAS UTILITIES AND INFRASTRUCTURE

CONDENSED CONSOLIDATING SEGMENT INCOME

(Unaudited)

(a)    Includes results of the wholly owned subsidiary Duke Energy Kentucky.

(b) Includes earnings from investments in Sabal Trail and Cardinal pipelines, as well as Hardy and Pine Needle storage facilities.

(c)    The gain on sale is $284 million lower at the Gas Utilities and Infrastructure segment level due to higher allocated goodwill related to the Piedmont Tennessee Disposal Group than at Piedmont Natural Gas LDC.

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GAS UTILITIES AND INFRASTRUCTURE

CONDENSED CONSOLIDATING BALANCE SHEETS – ASSETS

(Unaudited)

(a)    Includes balances of the wholly owned subsidiary Duke Energy Kentucky.

(b)    Includes the elimination of intercompany balances and purchase accounting adjustments.

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GAS UTILITIES AND INFRASTRUCTURE

CONDENSED CONSOLIDATING BALANCE SHEETS – LIABILITIES AND EQUITY

(Unaudited)

(a)    Includes balances of the wholly owned subsidiary Duke Energy Kentucky.

(b)    Includes the elimination of intercompany balances and purchase accounting adjustments.

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(a)    Except as indicated in footnote (b), represents non-weather-normalized billed sales, with energy delivered but not yet billed (i.e., unbilled sales) reflected as a single amount and not allocated to the respective retail classes.

(b)    Represents weather-normal total retail calendar sales (i.e., billed and unbilled sales).

(c)    Statistics reflect Duke Energy's ownership share of jointly owned stations.

(d)    Generation by source is reported net of auxiliary power.

(e)    Purchased power includes renewable energy purchases.

(f)    Based on winter capacity for Fossil, Nuclear and Hydro generation stations, and nameplate capacity for Renewable generation stations.

(g)    Statistics reflect 100% of jointly owned stations.

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(a)    Except as indicated in footnote (b), represents non-weather-normalized billed sales, with energy delivered but not yet billed (i.e., unbilled sales) reflected as a single amount and not allocated to the respective retail classes.

(b)    Represents weather-normal total retail calendar sales (i.e., billed and unbilled sales).

(c)    Statistics reflect Duke Energy's ownership share of jointly owned stations.

(d)    Generation by source is reported net of auxiliary power.

(e)    Purchased power includes renewable energy purchases.

(f)    Based on winter capacity for Fossil, Nuclear and Hydro generation stations, and nameplate capacity for Renewable generation stations.

(g)    Statistics reflect 100% of jointly owned stations.

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(a)    Except as indicated in footnote (b), represents non-weather-normalized billed sales, with energy delivered but not yet billed (i.e., unbilled sales) reflected as a single amount and not allocated to the respective retail classes.

(b)    Represents weather-normal total retail calendar sales (i.e., billed and unbilled sales).

(c)    Statistics reflect Duke Energy's ownership share of jointly owned stations.

(d)    Generation by source is reported net of auxiliary power.

(e)    Purchased power includes renewable energy purchases.

(f)    Based on winter capacity for Fossil, Nuclear and Hydro generation stations, and nameplate capacity for Renewable generation stations.

(g)    Statistics reflect 100% of jointly owned stations.

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(a)    Except as indicated in footnote (b), represents non-weather-normalized billed sales, with energy delivered but not yet billed (i.e., unbilled sales) reflected as a single amount and not allocated to the respective retail classes.

(b)    Represents weather-normal total retail calendar sales (i.e., billed and unbilled sales).

(c)    Statistics reflect Duke Energy's ownership share of jointly owned stations.

(d)    Generation by source is reported net of auxiliary power.

(e)    Purchased power includes renewable energy purchases.

(f)    Based on winter capacity for Fossil, Nuclear and Hydro generation stations, and nameplate capacity for Renewable generation stations.

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(a)    Except as indicated in footnote (b), represents non-weather-normalized billed sales, with energy delivered but not yet billed (i.e., unbilled sales) reflected as a single amount and not allocated to the respective retail classes.

(b)    Represents weather-normal total retail calendar sales (i.e., billed and unbilled sales).

(c)    Statistics reflect Duke Energy's ownership share of jointly owned stations.

(d)    Generation by source is reported net of auxiliary power.

(e)    Purchased power includes renewable energy purchases.

(f)    Based on winter capacity for Fossil, Nuclear and Hydro generation stations, and nameplate capacity for Renewable generation stations.

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(a)    Except as indicated in footnote (b), represents non-weather-normalized billed sales, with energy delivered but not yet billed (i.e., unbilled sales) reflected as a single amount and not allocated to the respective retail classes.

(b)    Represents weather-normal total retail calendar sales (i.e., billed and unbilled sales).

(c)    Statistics reflect Duke Energy's ownership share of jointly owned stations.

(d)    Generation by source is reported net of auxiliary power.

(e)    Purchased power includes renewable energy purchases.

(f)    Based on winter capacity for Fossil, Nuclear and Hydro generation stations, and nameplate capacity for Renewable generation stations.

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(a)    Piedmont has a margin decoupling mechanism in North Carolina, weather normalization mechanisms in South Carolina and Tennessee and fixed-price contracts with most power generation customers that significantly eliminate the impact of throughput changes on earnings. Duke Energy Ohio's rate design also serves to offset this impact. On March 31, 2026, Piedmont closed on the sale of its Tennessee business.

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