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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
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.