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Financial Instruments and Risk Management - Schedule of Financial Instruments and Fair Value (Details) - BRL (R$) R$ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of financial assets [line items] |  |  |
Financial assets | R$ 8,072 |  | R$ 6,540
Financial liabilities at amortised cost, class [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | (16,198) |  | (13,920)
Financial assets at fair value | (15,842) |  | (13,920)
Derivative Financial Instrument Assets Swaps [Member] | Level 2 of fair value hierarchy [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets |  |  | 368
Financial assets at fair value |  |  | 368
Concession Of Distribution Infrastructure [Member] | Level 3 of fair value hierarchy [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 2,807 |  | 1,920
Financial assets at fair value | 2,807 |  | 1,920
Indemnifiable Receivable Generation [Member] | Level 3 of fair value hierarchy [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 871 |  | 784
Financial assets at fair value | 871 |  | 784
Loans and debentures [member] | Financial liabilities at amortised cost, class [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | (12,280) |  | (9,831)
Financial assets at fair value | (11,934) |  | (9,831)
Debt With Pension Fund Forluz [Member] | Financial liabilities at amortised cost, class [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets |  |  | (90)
Financial assets at fair value |  |  | (90)
Deficit Of Pension fund Forluz [Member] | Financial liabilities at amortised cost, class [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | (494) |  | (521)
Financial assets at fair value | (484) |  | (521)
Concessions Payable [Member] | Financial liabilities at amortised cost, class [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | (27) |  | (28)
Financial assets at fair value | (27) |  | (28)
Suppliers [Member] | Financial liabilities at amortised cost, class [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | (2,952) |  | (3,017)
Financial assets at fair value | (2,952) |  | (3,017)
Leasing Transactions [Member] | Financial liabilities at amortised cost, class [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | (429) |  | (433)
Financial assets at fair value | (429) |  | (433)
Sector Financial Liabilities [Member] | Financial liabilities at amortised cost, class [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | (16) |  |
Financial assets at fair value | (16) |  |
Financial assets at amortised cost, class [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 10,661 |  | 9,369
Financial assets at fair value | 10,661 |  | 9,369
Financial assets at amortised cost, class [member] | Securities Cash Investments One [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 142 | [1] | 11
Financial assets at fair value | 142 |  | 11
Financial assets at amortised cost, class [member] | Accounts Receivable From Customers And Traders Concession Holders Transmission Service [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 5,850 |  | 5,477
Financial assets at fair value | 5,850 |  | 5,477
Financial assets at amortised cost, class [member] | Restricted Cash [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 235 |  | 31
Financial assets at fair value | 235 |  | 31
Financial assets at amortised cost, class [member] | Accounts Receivable From The State Of Minas Gerais [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 40 |  | 13
Financial assets at fair value | 40 |  | 13
Financial assets at amortised cost, class [member] | Concession Financial Assets C V A Account And Other Financial Components [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 1,296 |  | 806
Financial assets at fair value | 1,296 |  | 806
Financial assets at amortised cost, class [member] | Concession Grant Fee Generation Concessions [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 3,098 |  | 3,031
Financial assets at fair value | 3,098 |  | 3,031
Financial assets at fair value through profit or loss, category [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 16,319 |  | 14,546
Financial assets at fair value | 16,319 |  | 14,546
Financial assets at fair value through profit or loss, category [member] | Cash Equivalents Investments [Member] | Level 2 of fair value hierarchy [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 1,629 | [2] | 1,342
Financial assets at fair value | 1,629 |  | 1,342
Financial assets at fair value through profit or loss, category [member] | Bank Certificates Of Deposit [Member] | Level 2 of fair value hierarchy [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets |  |  | 74
Financial assets at fair value |  |  | 74
Financial assets at fair value through profit or loss, category [member] | Bank Financial Notes [Member] | Level 2 of fair value hierarchy [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 279 |  | 475
Financial assets at fair value | 279 |  | 475
Financial assets at fair value through profit or loss, category [member] | Marketable securities - treasury financial notes [member] | Level 1 of fair value hierarchy [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 72 |  | 214
Financial assets at fair value | 72 |  | 214
Marketable Securities [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 1,980 |  | 2,105
Financial assets at fair value | 1,980 |  | 2,105
Derivative Financial Instruments [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets | 5,658 |  | 5,177
Financial assets at fair value | R$ 5,658 |  | R$ 5,177
[1] | The book value represents the approximate fair value amount, except for loans, debentures and pension fund deficit equalization in relation to the amounts as of December 31, 2024.
[2] | The fair value presented is net of the transaction costs and anticipated resources presented in note 20.

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