United States

Securities and exchange commission
washington, d.c. 20549

FORM 6-K

report of foreign private issuer
pursuant to rule 13a-16 or 15d-16 of
the securities exchange act of 1934

For the month of September 2026

Commission File Number 1-15224

Energy Company of Minas Gerais

(Translation of Registrant’s Name into English)

Avenida Barbacena, 1200

30190-131 Belo Horizonte, Minas Gerais, Brazil

(Address of Principal Executive Offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F   a  Form 40-F ___

Index

Item       Description of Items

Forward-Looking Statements

This report contains statements about expected future events and financial results that are forward-looking and subject to risks and uncertainties. Actual results could differ materially from those predicted in such forward-looking statements. Factors which may cause actual results to differ materially from those discussed herein include those risk factors set forth in our most recent Annual Report on Form 20-F filed with the Securities and Exchange Commission. CEMIG undertakes no obligation to revise these forward-looking statements to reflect events or circumstances after the date hereof, and claims the protection of the safe harbor for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995.

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, thereunto duly authorized.

COMPANHIA ENERGÉTICA DE MINAS GERAIS – CEMIG

By: /s/ Andrea Marques de Almeida . Name: Andrea Marques de Almeida

Title: Vice President of Finance and Investor Relations

Date: September 9, 2026

COMPANHIA ENERGÉTICA DE MINAS GERAIS - CEMIG

PUBLICLY HELD COMPANY

Corporate Taxpayer’s ID (CNPJ): 17.155.730/0001-64

Company Registry (NIRE): 31300040127

NOTICE TO SHAREHOLDERS

First payout installment

We hereby inform our shareholders that CEMIG will pay the first payout installment related to fiscal year 2025 on June 30, 2026, as follows:

Regarding the payment of Interest on Equity (IoE), a 15% income tax will be withheld, except for shareholders exempt from said withholding, as provided for in the legislation in force.

Pursuant to Law 15,270/2025, individual shareholders residing in Brazil who receive dividends exceeding R$50,000.00 (fifty thousand reais) in the same calendar month, paid by the same legal entity, will be subject to withholding income tax at a rate of 10% on the total amount received, considering, for purposes of this threshold, the aggregate amount of all dividends paid during the respective month.

Under the same Law, profits and dividends paid, credited, or remitted to beneficiaries residing outside Brazil will be subject to withholding income tax at a rate of 10%, regardless of the amount received.

Shareholders whose bank details are updated with Banco Itaú Unibanco S.A., the custodian institution of CEMIG's registered shares, will have their credits automatically made on the payment day.

If the shareholder does not receive the aforementioned credit, they should go to a branch of Banco Itaú Unibanco S.A. to update their registration data.

The payout related to the shares held in custody with Companhia Brasileira de Liquidação e Custódia (CBLC) will be directly credited to such entity, and the Depository Brokers will be responsible for transferring them to the respective shareholders.

Belo Horizonte, June 10, 2026.

Andrea Marques de Almeida

Vice President of Finance and Investor Relations

COMPANHIA ENERGÉTICA DE MINAS GERAIS - CEMIG

PUBLICLY HELD COMPANY

CORPORATE TAXPAYER’S ID (CNPJ): 17.155.730/0001-64

COMPANY REGISTRY (NIRE): 31300040127

NOTICE TO THE MARKET

UN Global Compact's 100% Transparency Movement

COMPANHIA ENERGÉTICA DE MINAS GERAIS – CEMIG ("CEMIG" or "Company"), a publicly held company with shares traded on the stock exchanges of São Paulo and New York, hereby informs its shareholders and the market in general that it has achieved, ahead of schedule, all targets established by the 100% Transparency Movement ("Movement"), an initiative of the United Nations ("UN") Global Compact aimed at strengthening transparency, corporate ethics, and business integrity.

CEMIG joined the Movement in November 2023 and fully completed, in 2026, all commitments scheduled for implementation by 2030, demonstrating the Company's alignment with national and international best practices in corporate governance and compliance.

The Movement's targets cover matters related to transparency in relations with public authorities, disclosure and strengthening of whistleblowing channels, integrity in senior management compensation, ethics and anti-corruption training for strategic stakeholders, and transparency regarding governance and compliance structures.

In recognition of this achievement, CEMIG was honored during the Ambition 2030 Forum, held on June 02, 2026, in São Paulo. Among the 68 companies participating in the 100% Transparency Movement, only CEMIG and one other company fully met all targets established for 2030.

This achievement reinforces the Company's commitment to ethics, transparency, and integrity — pillars that contribute to sustainable value creation and strengthen the trust of investors, customers, partners, employees, and society as a whole.

Belo Horizonte, June 12, 2026.

Leonardo George de Magalhães

Vice President of Finance and Investor Relations

COMPANHIA ENERGÉTICA DE MINAS GERAIS - CEMIG

PUBLICLY HELD COMPANY

CORPORATE TAXPAYER’S ID (CNPJ): 17.155.730/0001-64

COMPANY REGISTRY (NIRE): 31300040127

MATERIAL FACT

Executive Board’s New Composition

COMPANHIA ENERGÉTICA DE MINAS GERAIS – CEMIG (“CEMIG” or “Company”), a publicly held company with shares traded on the stock exchanges of São Paulo and New York, pursuant to CVM Resolution 44/2021, hereby informs its shareholders and the market in general that, on June 11, 2026, the Company’s Board of Directors approved the appointment of new Vice Presidents:

VICE PRESIDENT OF FINANCE AND INVESTOR RELATIONS

Leonardo George Magalhães

Leonardo holds a bachelor’s degree in Accounting and has completed specialization courses in finance, management, strategy, and leadership from Brazilian and international institutions. He served as Cemig’s Vice President of Finance and Investor Relations from 2020 to 2024 and as President of Forluz from 2024 to 2026. He has more than 20 years of experience in leadership positions in the financial sector and has also served on Boards of Directors.

VICE PRESIDENT OF GENERATION AND TRANSMISSION

Demétrio Alexandre Ferreira

Demétrio holds a bachelor’s degree in Mechanical Engineering, an MBA in Business Management from FGV, and executive leadership training. He has 38 years of experience in the Brazilian electricity sector, including 31 years dedicated to the operation and maintenance of renewable generation assets. He built his professional career at Cemig, where he held several technical and managerial positions, including Superintendent of Generation Assets from 2019 to 2023.

VICE PRESIDENT OF DISTRIBUTION

Ernando Antunes Braga

Ernando holds degrees in Electrical Engineering and Occupational Safety Engineering, as well as a postgraduate degree in Electrical Power Systems from UFMG. He has 37 years of experience in the electric power sector and has built a solid career at Cemig, where he served primarily as Superintendent in the Distribution area. He stands out for his strategic expertise in planning, customer relations, performance management, operational efficiency, team leadership, and crisis management.

The Company also announces the new composition of its Executive Board as of June 11, 2026:

Belo Horizonte, June 12, 2026.

Leonardo George de Magalhães

Vice President of Finance and Investor Relations

COMPANHIA ENERGÉTICA DE MINAS GERAIS - CEMIG

PUBLICLY HELD COMPANY

CORPORATE TAXPAYER’S ID (CNPJ): 17.155.730/0001-64

COMPANY REGISTRY (NIRE): 31300040127

B3 (CMIG3, CMIG4)

NYSE (CIG, CIGC)

NOTICE TO SHAREHOLDERS

Declaration of Interest on Equity

We hereby inform our shareholders that the Executive Board approved today the declaration of Interest on Equity (IoE) of R$630,509,000 (six hundred and thirty million, five hundred and nine thousand reais). Detailed information about the payment is as follows:

Shareholders whose shares are not held in custody at CBLC and whose registration data is outdated are advised to go to a branch of Banco Itaú Unibanco S.A. (the institution managing CEMIG’s Registered Share System) bearing their personal documents for the update of their registration data.

Belo Horizonte, June 18, 2026.

Leonardo George de Magalhães

Vice President of Finance and Investor Relations

Quarter Highlights

2Q26 RESULTS

DISTRIBUTION

POST-EMPLOYMENT

TRADING

CAPITAL ALLOCATION

•         Cemig Sim: acquisition of 11 solar PV plants in 2Q26, totaling 26.2 MWp of installed capacity, for R$155 million

DEBT MANAGEMENT

SHAREHOLDER REMUNERATION

DOW JONES BEST IN CLASS INDEX

Financial and Operating Indicators

*Excluding energy settled at the Brazilian Electric Energy Trading Chamber (CCEE)

** Including post-employment expenses

Financial statements and spreadsheets are available at the following link:

Results Center | Cemig IR

Table of Contents

EBITDA and Net Income per Company for the Quarter

* Additional details on regulatory transmission results are provided in the section “Revenue and Regulatory EBITDA from Transmission”

Income Statement

Income Statement by Segment

Consolidated Energy Market

The Cemig Group billed approximately 9.6 million customers in June 2026, an increase of 131,000 customers compared to June 2025, which represents a 1.7% increase in the customer base. Of this total, 9,637,286 are end-users and self-consumers, and 623 are other players in the Brazilian electricity sector.

The chart below shows the Cemig Group’s share of sales to end-users:

Share of Energy Sales by Segment

Performance by Company

Cemig D

Billed Energy Market

Energy supply to captive customers, combined with energy transported to free-market customers and discos—excluding DG-offset energy —totaled 11,639 GWh in 2Q26, a 1.6% decrease compared to the same period in 2025. This result was mainly due to lower consumption in the industrial (-167.3 GWh or -3.1%), rural (-86.2 GWh or -11.1%), and commercial (-14.2 GWh or -0.9%) sectors, mainly due to the migration of customers to DG and the basic grid, as well as higher rainfall during the period, which reduced the need for irrigation. In contrast, the residential sector recorded an increase in consumption of 86.4 GWh (+2.7%), reflecting growth in the number of customers.

The 1.6% decrease in distributed energy, excluding DG, resulted from a 3.9% decrease (-214.3 GWh) in consumption by the captive market and a 0.4% increase (+27.7 GWh) in grid usage by the free-market customers.

Considering DG’s offset energy, total distributed energy grew by 1.2% compared to the same period last year.

Energy Distributed

By Segment (%)

Performance by Sector

Industrial: Energy distributed to industrial customers decreased by 3.1%* YoY and accounted for 45.7%* of Cemig D’s total, with the majority relating to energy supplied to industrial free-market customers (44.5%), which decreased by 2.2% YoY. Meanwhile, billed energy for captive customers—which accounted for 1.1% of total distribution—saw a 26.8% decrease in consumption YoY, primarily due to customers migrating to the free market.

The decline in industrial-sector consumption was impacted by the migration of two large customers to the basic grid. Excluding this effect, the reduction in distributed energy would have been 0.9%. The lower consumption in 2Q26 is related, in particular, to the Steel (-30.1%), Chemicals (-10.7%), and Ferroalloys (-5.9%) sectors, while the Non-Ferrous Metals (+9.4%), Food and Beverages (+3.3%), and Extractive Industry (+1.6%) sectors showed growth in energy consumption.

Residential: Residential consumption, which accounted for 28.0%* of the energy distributed by Cemig D, increased by 2.7% YoY, mainly due to a 2.6% growth in the number of customers in this segment (+208,100), as well as a 0.1% increase in average consumption per customer, which reached 131.1 kWh/month.

Commercial and Services: The commercial segment accounted for 12.9% of the total volume of energy distributed by Cemig D in 2Q26* and showed a 0.9% YoY decrease in consumption. The change in this segment’s volume reflects a 9.2% decrease in the billed volume for captive customers and a 9.7% increase in the volume transported to free-market customers, a trend directly linked to the migration of customers to the deregulated market. The decrease in the segment’s total consumption, in turn, is related to the decline in the number of customers.

Rural: This sector accounted for 5.9%* of total distributed energy and showed an 11.1% YoY decrease in consumption, mainly due to higher rainfall in 2Q26 compared to the same period in 2025, which reduced the need for irrigation.

Public Services: accounted for 6.7%* of distributed energy in 2Q26, with a 1.4% YoY decrease in consumption.

*Excluding DG offset energy

Physical Energy Balance – MWh

Customer Base

In June 2026, 9.64 million consumers were billed, up 1.6% when compared to June 2025. Of this total, 6,488 are free-market customers who use Cemig D’s distribution network.

2026 Tariff Adjustment

Cemig D's tariffs are adjusted annually in May, with a tariff review process conducted every five years in the same month. The annual adjustment is designed to fully pass through non-manageable costs and to apply an inflation adjustment to manageable costs, as defined in the tariff review. The adjustment index for manageable costs is IPCA, from which the X Factor is deducted to capture productivity gains, in line with the price-cap regulatory model.

On May 26, 2026, ANEEL approved the Company’s Tariff Adjustment, effective from May 28, 2026, through May 27, 2027, with an average increase of 6.50% for consumers. The average impact on low-voltage customers was 5.21%, the same percentage applied to residential consumers. Of the total 6.50% adjustment, 1.40 percentage points correspond to costs manageable by the Company (Portion B). Non-manageable costs (Portion A)—which include energy purchases, transmission, sector-specific charges, and unrecoverable revenues—contributed 0.68 percentage points, while financial items incorporated into the rate accounted for the remaining 4.42 percentage points.

More details at the following link (in Portuguese):
Approval Resolution No. 3589/2026 - Leis.org

Tariff Review

Highlights of the 2023 Tariff Review and the previous cycle:

* CAIMI (Custo Anual das Instalações Móveis e Imóveis) – annual cost of movable and immovable facilities (IT, vehicles and administrative buildings)

* QRR: Regulatory Depreciation Quota: Gross base x annual depreciation rate

More details at the following link:
https://www2.aneel.gov.br/aplicacoes/tarifa/arquivo/NT%2012%202023%20RTP%20Cemig.pdf

OPEX and EBITDA | Actual vs. Regulatory

OPEX and EBITDA outperformed regulatory benchmarks in 1H26, reaching R$416 million and R$666 million, respectively.

Notes:

Regulatory EBITDA comprises return on capital, the regulatory depreciation quota (QRR) and a percentage of the Annual Cost of Movable and Immovable Facilities (CAIMI), as published in ANEEL's Technical Notes at each Tariff Review or Tariff Adjustment.

Regulatory coverage considered: Regulatory PMSO + non-recoverable revenues + 78.45% of CAIMI.

Quality Indicators – DEC/FEC

The DEC (Equivalent Duration of Interruptions per Consumer) indicator stood at 8.43 hours at the end of 2Q26, its lowest level on record and below the regulatory limit of 9.26 hours. This represents a reduction of more than 1 hour compared with the 12-month period ended June 2025. The FEC (Equivalent Frequency of Interruptions per Consumer Unit) indicator also remained below the regulatory limit of 5.37, reaching 4.86 for the 12-month period ended in June 2026.

Delinquency Management

The collection rate has remained above 99% since 2022, reaching 99.14% in June 2026. This performance reflects the effectiveness of the Company’s collection tools and the successful conclusion of significant negotiations that resulted in customer payments.

Digital channels—including PIX, direct debit, credit cards, and the mobile app—accounted for 74.08% of total collections, compared with 67.50% in June 2025. PIX was particularly noteworthy, consolidating its position as customers’ primary payment method due to its convenience and the effectiveness of the Company’s promotional campaigns. Representing approximately 40% of total collections, PIX delivers significant efficiency gains by reducing operating expenses and improving the Company’s cash flow.

Account Collection Rate - ARFA (%)

(Collections/Billing) – 12-Month Moving Average

Losses

Energy losses remained below the regulatory target in the 12-month period ended June 2026, reaching 11.40%, compared with the regulatory target of 11.48%. Since the previous tariff adjustment, effective May 28, 2025, the Company has applied an enhanced methodology for calculating regulatory coverage of non-technical losses, as established by ANEEL Technical Note No. 53/2025. The methodology now uses metered energy rather than billed energy as the basis for calculation, resulting in increased tariff coverage for energy losses.

Among the key loss-reduction measures implemented in the first half of the year were 169,000 inspections, the replacement of more than 145,000 obsolete meters, and the replacement of 157,000 conventional meters with smart meters. The latter brought the total number of smart meters installed since the project began in September 2021 to 760,000. The Company also continued regularizing unauthorized connections for households in informal settlements and high-complexity areas using shielded wiring, reaching 28,500 regularizations since the initiative began in February 2023.

For 2026, the Company plans to conduct 358,000 inspections, install 400,000 smart meters, replace 150,000 obsolete meters, and regularize connections for 25,000 households in low-income communities using BT Zero and Shielded Meter Panel technologies. It also plans to expand the use of capacitor banks to improve the control of technical losses, alongside other structural initiatives.

Total Losses

Actual Losses

Regulatory Losses

Cemig GT/Holding

Energy Market

Energy sales by Cemig GT and Cemig Holding, excluding CCEE, decreased 2.9% YoY, while energy billed by Cemig GT totaled 7,069 GWh, up 11.3% (+716.9 GWh) YoY. Cemig Holding recorded sales of 3,848 GWh, a 21.3% decrease compared to the same period last year. Of the total sold by the Holding and Cemig GT in 2Q26, 509.0 GWh were sold in the retail market.

Energy Balance – Sales Breakdown

https://ri.cemig.com.br/en/financial-information/electric-energy-balances

Energy Supply and Demand Balance – Cemig Group* – Position in July 2026

Gasmig

Gasmig is the exclusive distributor of piped natural gas in the state of Minas Gerais, serving the industrial, commercial, residential, compressed natural gas, automotive, and thermoelectric power generation segments. Its concession runs through January 2053, and Cemig holds a 99.57% interest in the company.

The decline in Gasmig’s EBITDA (-15.4%) was driven by a 17.0% drop in total gas distribution volume and by the migration of customers to the free market, which offers a lower margin.

The YoY decrease in total gas volume distributed resulted from a 55.7% reduction in volume sold to the captive market (-108,800 m³), partially offset by a 75.6% increase in volume distributed to free-market customers (+61,700 m³). Lower sales volumes reflected industrial customers’ migration to the free market, which in turn increased distributed volumes in that segment. Considering the total volume distributed, the industrial sector was primarily responsible for the reduction, with a decrease of 31,400 m³ YoY, while the thermal segment saw a decrease of 15,300 m³.

Gasmig saw a 5.9% increase in the number of customers compared to June 2025, reaching 113,057 consumers in 2Q26, mainly due to the increase of 6,300 customers in the residential sector.

It is worth noting that the most recent tariff review process for Gasmig took place in April 2022, with the following highlights:

Consolidated Financial Performance

Operating Revenue

Gross Energy Supply

(1) The average price does not include revenue from unbilled supply

Consolidated Energy Sales*: -1.0%

GWh

*Including DG-offset energy

Revenue from Energy Supply

Gross revenue from energy supply went up by 4.3%, to R$9,055.9 million in 2Q26 from R$8,686.4 million in 2Q25. The change was primarily driven by the annual tariff adjustment for Cemig D and the higher volume of energy sold to residential customers.

Transmission

The Company’s transmission revenue consists of operating and maintenance revenue, construction revenue, and financial remuneration of the contract asset. In 2Q26, transmission revenue totaled R$506.6 million, up 56.5% YoY. This change is explained by the increase in revenue from financial remuneration of the contract asset, which grew by R$149.6 million due to the higher IPCA during the period (the inflation index used to adjust most of the revenue), and by the R$44.2 million increase in construction revenue, resulting from higher investments.

Gas

Gross revenue from gas supply totaled R$563.4 million in 2Q26, down 41.7%, mainly due to the migration of industrial customers to the free market, the main factor behind the 55.7% decline in sales volume.

TUSD (Tariff for Use of the Distribution System)

TUSD’s revenue—derived from charges levied on free-market consumers for distributed energy—increased by R$219.2 million (+15.5%) YoY in 2Q26. This change stems from the disco’s annual tariff adjustments, implemented on May 28, 2025—with full effect in 2Q26—and on May 28, 2026—with impact effective as of that date—as well as from the increase in charges paid by free-market consumers.

CVA (regulatory deferral account for variances in Portion A costs) and Other Financial Components

Revenue of $213.7 million was recognized in 2Q26, up 203.7% YoY, mainly because energy purchase and CDE costs exceeded the amounts incorporated into the tariff adjustment.

Cemig D recognizes in its financial statements the positive or negative variances between actual non-manageable costs and the estimated costs used as the basis for setting tariffs. These balances represent the amounts that will be reimbursed to consumers or passed on to Cemig D in future tariff adjustments.

Operating Costs and Expenses

Operating costs and expenses totaled R$9.42 billion in 2Q26, an YoY increase of R$245.3 million (+2.7%). This change is primarily due to a R$238.0 million increase in the cost of energy purchased for resale and a R$289.7 million increase in construction costs (higher investments), offset by a decrease of R$286.7 million in the cost of gas purchased for resale.

Further details on costs and expenses are provided below.

Energy Purchased for Resale

Consolidated costs for electricity purchased for resale totaled R$4.79 billion in 2Q26, an increase of R$238.0 million YoY. This change is primarily due to the following factors:

Gas Purchased for Resale

In 2Q26, the cost of gas purchases was R$198.5 million, representing an YoY decrease of R$286.6 million. This change is primarily due to the reduction in the volume of gas purchased to meet demand in the regulated market, given the migration of major industrial customers to the free gas market.

Third-party Services

Expenses for third-party services rose 21.5% (+R$113.0 million) YoY, driven primarily by the following increases: R$54.8 million (+30.1%) for maintenance and upkeep of electrical equipment, largely due to an increase in preventive maintenance; R$13.5 million (+38.8%) for information technology, R$11.1 million (+42.9%) for tree trimming, and R$9.2 million (22.4%) for right-of-way cleaning. The increase in expenses is directly related to the higher volume of work performed during the period, with a focus on strengthening the grid’s resilience and improving the quality and reliability of the energy supply.

Expected Credit Losses (ECL)

Expenses related to expected credit losses represented a reversal of R$177.0 million in 2Q26, compared to losses of R$3.1 million in 2Q25. The reversal in 2Q26 resulted from a revision to the methodology for calculating Expected Credit Losses (ECL) aimed at improving the alignment of estimates with the actual recoverability of receivables, with an impact of R$232.2 million. The main changes implemented were:

The revision was based on three main pillars: (i) the effectiveness of collection tools, as evidenced by improvements in the aging profile of outstanding receivables; (ii) benchmarking against other companies in the electric power sector; and (iii) consistency with the concepts applied by ANEEL in calculating Irrecoverable Revenues, bringing regulatory and IFRS methodologies into closer alignment.

Provisions for Contingencies

Provisions for contingencies totaled R$215.1 million in 2Q26, up R$151.2 million YoY. The change is primarily explained by the recognition of a provision resulting from an award in an arbitration proceeding initiated by a free-market customer.

Post-employment obligations

Expenses related to post-employment obligations decreased by R$59.1 million YoY. Excluding the non-recurring effect of the remeasurement of the obligation in 2Q25, the expense would have been R$80.2 million lower. The reduction in this expense is a direct result of the termination of the obligation related to the healthcare plan, pursuant to an agreement with unions and retirees that was ratified by the Regional Labor Court (TRT) at the end of 2025.

Personnel

Personnel expenses totaled R$420.8 million in 2Q26, up R$32.4 million YoY. The main factors driving this growth were the annual collective wage adjustment and the voluntary dismissal programs (VDPs) implemented in 2Q26 and 2Q25, with expenses of R$42.8 million and R$25.4 million, respectively.

Personnel Costs Evolution

R$ million excluding VDPs

Number of Employees by Company

Equity Income

Equity income increased by R$14.0 million in 2Q26 compared to the same period last year. This performance was primarily driven by improved results at TAESA, reflecting the energization of new transmission assets and the resulting incremental RAP, as well as higher inflation indices (IGP-M and IPCA), which positively impacted the financial remuneration of contract assets. Worth noting that Cemig Sim no longer recognizes results under the equity method, as it divested its interests in other companies at the end of 2025 and now owns all of its assets directly.

Consolidated EBITDA

(1) EBITDA is a non-GAAP measure prepared by the Company and reconciled to its consolidated financial statements in accordance with Circular Letter CVM/SNC/SEP No. 01/2007 and CVM Resolution No. 156, dated June 23, 2022. It consists of net income adjusted for net financial result, depreciation and amortization, and income tax and social contribution. EBITDA is not a measure recognized under Brazilian GAAP or IFRS, has no standardized definition, and may not be comparable to similarly titled measures reported by other companies. The Company discloses EBITDA because it uses the measure to assess its performance. EBITDA should not be considered in isolation or as a substitute for net income or operating income, as an indicator of operating performance or cash flow, or as a measure of liquidity or of the ability to service debt. The Company adjusts EBITDA in accordance with CVM Resolution No. 156/2022 to exclude non-recurring items that do not reflect its underlying cash generation.

Consolidated EBITDA grew 8.8% YoY in 2Q26 and totaled R$2.24 billion, while Adjusted EBITDA was R$2.47 billion, up 9.3% from 2Q25. The main factors affecting the comparison are as follows:

Cemig D EBITDA

Cemig D reported EBITDA of R$1,476.7 million, up 19.0% YoY. Adjusted EBITDA, in turn, grew 21.1% compared to the same period last year. The main factors affecting YoY EBITDA are as follows:

Cemig GT EBITDA

Cemig GT’s EBITDA totaled R$479.7 million in 2Q26, up 15.6% from 2Q25, while adjusted EBITDA grew by 10.7%. The main factors affecting EBITDA in 2Q26 and 2Q25 and the year-over-year change are as follows:

Financial Income and Expenses

The consolidated financial results for 2Q26 was a net expense of R$795.9 million, up R$483.3 million YoY, primarily due to the following factors:

Net Income

Cemig reported net income of R$945.4 million in 2Q26, compared to R$1,188.3 million in 2Q25. Adjusted earnings were 15.5% lower than those recorded in 2Q25, totaling R$1.17 billion.

As discussed in the previous sections, net income was primarily impacted by lower EBITDA from the Trading business, partially offset by stronger EBITDA from the Distribution, Generation and Transmission businesses. Net income was also affected by higher financial expenses (+ R$483.3), mainly reflecting the increase in net debt, higher inflation as measured by IPCA in 2Q26, higher monetary adjustment expenses on provisions, and the restatement of DG customers’ credits.

Investments

Total investments amounted to R$3.28 billion in 1H26, representing a 19.2% increase compared to 1H25. Of this amount, R$1.80 billion was invested in 2Q26.

The main highlights this quarter were: a R$1.36 billion investment by Cemig Distribuição, comprising a 91 MVA expansion in transformer capacity, 5 new substations and 2 expanded ones, the construction of 1,121 km of low- and medium-voltage networks, and the installation of 66,000 smart meters. In addition, there was an investment of R$165.9 million in transmission reinforcements and improvements, the addition of 26 MWp of installed capacity in distributed photovoltaic generation, and the construction of 23.8 km of gas pipelines by Gasmig.

The investment program supports the modernization and reliability of CEMIG’s electric system, in line with the Company’s strategic focus on Minas Gerais, its core businesses, and continuously improving customer service. Investments totaling BRL 43.70 billion are planned for 2026–2030, of which BRL 6.72 billion is earmarked for 2026.

Execution of the company’s investment program ensures the MODERNIZATION and RELIABILITY of CEMIG’s electric system

Consolidated Debt