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The statements contained in this report regarding the business outlook of ISA ENERGIA BRASIL (B3: ISAE3, ISAE4) ("ISA ENERGIA BRASIL", "Company"), projections and its growth potential are mere forecasts and were based on management's expectations regarding the Company's future. These expectations are highly dependent on changes in the market, in the general economic performance of the country, the sector and international markets, and are subject to change. Future considerations are not guarantees of performance. They involve risks, uncertainties, and assumptions, as they refer to future events and, therefore, depend on circumstances that may or may not occur. Investors should understand that general economic conditions, market conditions and other operating factors may affect the future performance of ISA ENERGIA BRASIL and lead to results that differ materially from those expressed in such forward-looking considerations. The financial information has been prepared in accordance with CVM standards and CPCs, and is in accordance with international accounting standards (IFRS) issued by the International Accounting Standard Board (IASB). The Regulatory Result is presented, in accordance with the accounting practices adopted in Brazil. The purpose of disclosing the Regulatory Result is merely to contribute to the understanding of ISA ENERGIA BRASIL's business. Sums may differ due to rounding. The Regulatory result is audited only at the end of each fiscal year by the independent auditors. DISCLAIMER
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CONCLUSION OF ASSETS CROSS-HOLDS UNWINDING ✓ Full consolidation of Madeira and divestment of Garanhuns starting in Aug/2026 3 1 AAR (Annual Authorized Revenue) 2026/2027 cycle | 2 Construction Cost (IFRS), value in nominal terms | 3 Adjusted for the non-controlling shareholder's interest in exclusive investment funds. PRIMARY FOLLOW ON Issuance of 44.4 million new PN shares Capital increase of R$1.2 bn in Jul/2026 STRATEGY INVESTMENT EXECUTION ISAE4 FINANCIAL HIGHLIGHTS 2026/2027 CYCLE READJUSTMENT + R$709 mm in AAR (+11% vs. 2025/2026 Cycle) Strategy execution continues to enable opportunities and deliver results ENERGIZATIONS: Piraquê and Jacarandá AAR1 R$376 mm INVESTED AMOUNT: R$1.1 bn -4.4% vs. 2Q25 • Greenfield Projects R$608.1 mm (-16% vs. 2Q25) • Retrofitting and Improvements R$445.4 mm (+17% vs. 2Q25) NET REVENUE: R$1.2 bn +20.9% vs. 2Q25 EBITDA: R$967 mm +22.5% vs. 2Q25 Margin of 77.8% + 1 p.p. vs. 2Q25 NET INCOME3: R$174 mm -32.0% vs. 2Q25
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PRIMARY FOLLOW ON SHAREHOLDING STRUCTURE Free Float (ex-AXIA) ON 96.9% 96.9% PN 1.2% 1.1% TOTAL: 35.8% 33.6% 2.2% 2.2% 31.1% 28.2% 20.7% 19.4% 0.8% 0.8% 67,6% 70.6% 43,5% 47.1% Before After- offer Legend: R$27.00 Total Amount Share Price R$1.2 bn ~30% International Investors~75% Long-only Investors Diversified allocation oriented to the generation of long-term value: ISAE4 O F F E R R E S U LT ALLOCATION OF RESOURCES Unwinding of Assets Investments in R&I 4 Oversubscription Base Offer11x Total Offer6x 44.4 million¹ Issued PN shares High demand supports confidence in strategy execution 1 Base offering 22.2 million shares + 22.2 million hot-issue.
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UNWINDING OF ASSETS 5 5 SCOPE OF TRANSACTION Madeira Garanhuns IE Garanhuns IE Madeira 51% 51% 49% 49% Transaction Perimeter PRE-TRANSACTION POST-TRANSACTION IE GaranhunsIE Madeira 100%100% • As part of the corporate simplification, ISA ENERGIA BRASIL now owns 100% of IE Madeira and sold its stake in IE Garanhuns to Axia, optimizing its governance structure. • Increase in the AAR 2026/2027 cycle +R$306 mm +R$390 mm IE Madeira - R$84 mm IE Garanhuns Full consolidation of Madeira and sale of the stake in Garanhuns 1 Remaining term of the concession as of Jul/26 IE Madeira IE Garanhuns Transmission Lines 2,385 km 633 km Substation 7,464 MVA 2.100 MVA AAR Cycle 26/27 (R$ mm) 797 165 Commercial Operation Date (COD) Aug/13 Nov/15 Remanescent Prazo¹ 12.7 years 15.5 years • Cash payment of the transaction: R$1,2 bn Unwinding of assets simplifies the structure and adds R$ 306 million to the AAR...
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2026/2027 AAR CYCLE READJUSTMENT 3.806 (54%) 2.679 (38%) 597 (8%) 17% 35%19% 29% 6 Paulista Concession (059) R$7.1 bn R$3.8 bn Concessão Paulista (059) New concessions under operation New concessions under construction R$ million POTENTIAL AAR¹ - CYCLE 2026/2027 AAR CYCLE 2026/2027 (ex-PA) 1 Potential AAR considers values established at the time of publication of the respective AAR Approval Resolutions of the tariff cycles | 2 Retrofitting and Improvements | 3 Operation and Maintenance. CYCLE ADJUSTMENT UNWINDING OF ASSETS Economic RBSE Financial RBSE O&M³ R&I² ... which totals R$7.1 bn in the 2026/2027 Cycle, also expanded by IPCA and R&I 597 597 597 6,485 26/27 AAR Cycle (ex-PA) IPCA -16 1,022 PA 6,469 26/27 AAR Cycle (with PA) 5,351 25/26 AAR Cycle (ex-PA) +314 +129 R&I3 -41 Other 6,179 26/27 AAR Cycle (ex-PA) +390 IE Madeira -846,373 6,776 7,082 7,066 IE Garanhuns +11% (+709) AAR under construction AAR under operation
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INVESTMENT EXECUTION | GREENFIELD 49% 33% AAR Cycle 26/27 CAPEX ANEEL6 COD ANEELPROJECTS PHYSICAL PROGRESS5 3,731 2,719 337 260 Mar/29 Mar/29 NEW CONCESSIONS UNDER CONSTRUCTION EXECUTED INVESTMENTS1 GREENFIELDR$ million R$ million Serra Dourada Itatiaia 7 1 Construction Cost (IFRS), value in nominal terms | 2 Actual amount in real terms as of Jun/26 | 3 Compared to the date established by ANEEL, it only considers projects with 100% control | 4 CAPEX in real terms as of Jun/26 | 5 Evolution of all activities related to the project until its energization | 6 ANEEL CAPEX in real terms as of Jun/26. ENERGIZED PROJECTS IN 2Q26 JACARANDÁ (SP) PIRAQUÊ (MG/ES) AAR (Cycle 26/27) R$359 mm R$17 mm CAPEX 2 R$4.5 bn R$286 mm ~R$4.6 bnREMAINING CAPEX (July/26 – 2028)4 TRACK RECORD 11 months Average anticipation3 23% Average CAPEX Efficiency 4 New energizations add AAR of R$ 376 mm and sustain profitable growth 723 608 2Q25 2Q26 -16% (-115) 2023 2024 2025 1H25 1H26 847 2,263 3,414 1,525 1,460 +101% -4% (-64)
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INVESTMENT EXECUTION | R&I R$ million AUTHORIZED R&I PIPELINE2 ENERGIZED PROJECTS IN R&I | 1H26 8 1 Construction Cost (IFRS), value in nominal terms | 2 Value in real terms as of Jun/26 | ³ Regulatory depreciation | 4 CAPEX in nominal terms. R$ million EXECUTED INVESTMENTS1 R&IR$ million Investments and new authorizations maintain R&I pipeline at R$7.2 billion 52% 48% 2023 49% 51% 2024 47% 53% 2025 49% 51% 1H25 52% 48% 1H26 1,220 1,371 1,690 685 815 +18% +19% (+130) 49% 51% 2Q25 63% 37% 2Q26 379 445 +17% (+66) Retrofitting Improvements 2.8x 3.1x 3.8x CAPEX/QRR³ 1.8x1.5x +481 Pipeline Mar/2026 -445 Investments 2Q26 New authorizations and updates Pipeline Jun/2026 7,2467,210 +1% (+36) Large-scaleSmall-scale ~R$340 mm ~R$135 mm R$475 mm Total Invested4 72% 28% 100%
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INVESTMENT EXECUTION EVOLUTION OF TOTAL INVESTMENT¹ R$ billion 9 1 Includes greenfield projects and Retrofitting and Improvements | 2 Construction Cost (IFRS) in nominal terms as of Jun/26. ~R$12 billion CAPEX pipeline ensures long-term growth 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 1.4 1.9 2.1 3.6 5.1 +38% ~ R$12 billion authorized² Authorized investment Executed investment
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FINANCIAL HIGHLIGHTS HIGHLIGHTS Net Operating Income (ex-RBSE) ▼ Reduction of the Financial Component after ANEEL's decision in 2025. PAULISTA CONCESSION ▲ Energized large-scale R&I projects (LTM4); NEW CONCESSIONS ▲ Energized projects (LTM4): Água Vermelha (2Q25), Riacho Grande (4Q25), Piraquê (2Q26) and Jacarandá (2Q26); PA AND ANTICIPATIONS ▲ Temporary differences related to sectoral charges; ▲ End of the amortization in June 2025 of Ke's share in the financial component of RBSE; ▼ End of retroactive receipt of the Annuity of Improvements as of July/25. RBSE ▲ Adjustment of the AAR for the 2025/2026 Cycle by the IPCA (5.32%); NET REVENUE R$ million 10 Revenue grows 21%, reflecting energizations and AAR adjustment 1 Regulatory Accounting | ² Considers updating by IPCA and energizing projects |3 Includes RBSE's PA in 2Q25 | 4 Last twelve months (LTM). 513 779 516 2Q25 464 2Q26 1,029 1,243 +267 (+52%) +21% (+215) RBSE Net Operating Revenue (ex-RBSE) +62 +105 +108 Net revenue 2Q25 Paulista Concession + R&I New Concessions² -52 RBSE PA, PV and Anticipation ³ -8 Others 4 Net revenue 2Q256 1,029 1,243 +21% (+215)
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FINANCIAL HIGHLIGHTS EBITDA NET INCOME3 EBITDA ▲ Energization of LTM greenfield and large-scale R&I projects; ▲ Gain in operational efficiency with an increase in revenue higher than in expenses; NET INCOME3 ▼ Increase in financial expenses due to the bigger financial leverage 11 HIGHLIGHTS R$ million R$ million 1 Regulatory Accounting | ² Personnel, Material, Services and Others | 3 Adjusted for the non-controlling shareholder's interest in exclusive investment funds. OPERATING COSTS AND EXPENSES (PMSO²) R$ million OPERATING COSTS AND EXPENSES (PMSO²) R$ million Disciplined cost management and gains of scale increase operational efficiency 171 181 336 362790 967 1.713 1.988 2Q25 2Q26 1H25 1H26 +6% (+11) +22% (+177) +8% (+26) +16% (+275) Jointly controlled subsidiaries Consolidated 187 211 2Q25 2Q26 +13% (+24) 749 804 771 364 390 2023 2024 2025 1H25 1H26 PMSO² 256 +215 +9 +44 -26 Income Taxes Financial Result -287 Equity Income -12 Contingencies/ Depreciation PMSO -24 Net Revenue Other Net Income 2Q26 174 Net Income 2Q25 -32% (-82) 36% 34% 32% PMSO / Net Operating Revenue (ex-RBSE) 30% 25%
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FINANCIAL HIGHLIGHTS Average Term 8.7 years (vs. 8.3 in Dec/25) Dec/25 Jun/26 14.1 16.3 +15% (+2,2) 3.63x 3.78x Leverage³: Net Debt/ EBITDA LTM R$ billion 91% OF DEBT FROM 2030 OWNARDS NET DEBT1,2 R$17.7bn (+10.7% vs. Dec/25) AMORTIZATION SCHEDULE R$ billion Average Real Cost4 7.11% (vs. 7.56% in Dec/25) 67% 29% IPCA CDI TJLP / TLP Outros I n s t i t u t i o n a l (subsequent events) 24 th DEBENTURE ISSUANCES FOR THE PERIOD 23 rd22 nd21 st Volume (R$ billion) 3,9 1 1,5 1 Maturity (years) 4, 5 and 9 5 15 4 ~4 Cost CDI + 0.55%, 0.6% and 0.84% 5 IPCA+6.46% CDI+0.42% p.a. CDI+0.42% p.a. Differential -80bps vs. spreads of replaced emissions -87bps vs. NTN-B Lower spread among institutional debentures in sector6 12 E x c h a n g e O f f e rI n c e n t i v i z e da n d g r e e n 1 ISA ENERGIA BRASIL and subsidiaries | ² Net Debt does not consider the cash equivalents of non-consolidated companies | ³ Calculation according to the methodology of financing via BNDES, annual measurement. EBITDA Last Twelve Months | 4 Average real cost over the last twelve months, considering IPCA inflation of 4.64% and a real rate of 4.26% as of Dec/25| 5 Referring to the 1st, 2nd and 3rd series, respectively | 6 Considering the electricity sector in debentures with a maturity of 4 years. 4% GROSS DEBT Recent funding extends average maturity and reduces average cost of debt 2026 0.4 2027 0.4 2028 0.4 2029 1.0 2030 1.7 2031 1.3 2032 1.7 2033 0.6 Cash & Equivalents 2.7 2035 7.1 2036 a 2044 1.8 2% 2% 2% 2% 6% 10% 7% 10% 3% 15% 40% 0.4 2034
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OPPORTUNITIES DRIVEN FOR THE ENERGY TRANSITION AND REINFORCEMENTS OF EXISTING NETWORKS RESILIENT BUSINESS MODEL PREDICTABLE REVENUES AND PROTECTED AGAINST INFLATION FINANCIAL DISCIPLINE SUPPORTING GROWTH WITH DIVIDEND DISTRIBUTION COMPETITIVE ADVANTAGES PROVEN BY TRACK RECORD 1. 2. 3. 4. WHY INVEST IN ISAE4? LONG-TERM VISION CREATING POSITIVE SOCIAL AND ENVIRONMENTAL IMPACTS 5. 13
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I N V E S T O R R E L A T I O N S @isaenergiabr ri.isaenergiabrasil.com.br ri@brasil.isaenergia.com