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Financial Instruments (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Total financial assets, book value R$ 13,984,091 R$ 10,338,902
Total financial assets, fair value 14,084,625 10,438,723
Total financial liabilities, book value 20,715,722 19,404,557
Total financial liabilities, fair value 20,492,093 18,727,925
Financial liabilities at amortised cost, class [member]    
IfrsStatementLineItems [Line Items]    
Total financial liabilities, book value 19,962,138 18,665,854
Total financial liabilities, fair value 19,738,509 17,989,222
Financial liabilities at fair value through profit or loss, category [member]    
IfrsStatementLineItems [Line Items]    
Total financial liabilities, book value 753,584 738,703
Total financial liabilities, fair value 753,584 738,703
Sectorial Financial Liabilities [Member] | Financial liabilities at amortised cost, class [member]    
IfrsStatementLineItems [Line Items]    
Total financial liabilities, book value 503,991 483,255
Total financial liabilities, fair value 503,991 483,255
ICMS Installment Payment [member] | Financial liabilities at amortised cost, class [member]    
IfrsStatementLineItems [Line Items]    
Total financial liabilities, book value 41,286 48,320
Total financial liabilities, fair value 37,777 43,419
Special Tax Regularization Program Pert [Member] | Financial liabilities at amortised cost, class [member]    
IfrsStatementLineItems [Line Items]    
Total financial liabilities, book value 379,724 404,075
Total financial liabilities, fair value 322,711 340,025
PIS And Cofins To Be Refunded To Consumers [member] | Financial liabilities at amortised cost, class [member]    
IfrsStatementLineItems [Line Items]    
Total financial liabilities, book value 731,726 1,995,158
Total financial liabilities, fair value 731,726 1,995,158
Accounts Payable To Suppliers [Member] | Financial liabilities at amortised cost, class [member]    
IfrsStatementLineItems [Line Items]    
Total financial liabilities, book value 2,285,573 2,215,470
Total financial liabilities, fair value 2,285,573 2,215,470
Loans And Financing [Member] | Financial liabilities at amortised cost, class [member]    
IfrsStatementLineItems [Line Items]    
Total financial liabilities, book value 5,387,977 4,694,957
Total financial liabilities, fair value 5,138,930 4,171,789
Debentures [Member] | Financial liabilities at amortised cost, class [member]    
IfrsStatementLineItems [Line Items]    
Total financial liabilities, book value 9,738,006 7,887,077
Total financial liabilities, fair value 9,699,171 7,688,396
Accounts Payable Related To Concession [Member] | Financial liabilities at amortised cost, class [member]    
IfrsStatementLineItems [Line Items]    
Total financial liabilities, book value 893,855 937,542
Total financial liabilities, fair value 1,018,630 1,051,710
Fair Value In The Purchase And Sale Of Power [Member] | Level 3 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member]    
IfrsStatementLineItems [Line Items]    
Total financial liabilities, book value 753,584 738,703
Total financial liabilities, fair value 753,584 738,703
Financial assets at fair value through profit or loss, category [member]    
IfrsStatementLineItems [Line Items]    
Total financial assets, book value 9,290,044 5,728,351
Total financial assets, fair value 9,290,044 5,728,351
Financial assets at fair value through profit or loss, category [member] | Cash And Cash Equivalents Financial Asset [Member] | Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Total financial assets, book value 5,634,623 2,678,457
Total financial assets, fair value 5,634,623 2,678,457
Financial assets at fair value through profit or loss, category [member] | Bonds And Securities One [Member] | Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Total financial assets, book value 495,495 431,056
Total financial assets, fair value 495,495 431,056
Financial assets at fair value through profit or loss, category [member] | Accounts Receivable Related To The Distribution Concession [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Total financial assets, book value 1,954,679 1,442,819
Total financial assets, fair value 1,954,679 1,442,819
Financial assets at fair value through profit or loss, category [member] | Accounts Receivable Related To The Generation Concession [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Total financial assets, book value 71,835 68,642
Total financial assets, fair value 71,835 68,642
Financial assets at fair value through profit or loss, category [member] | Fair Value In The Purchase And Sale Of Power In The Active Market [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Total financial assets, book value 1,101,684 1,081,758
Total financial assets, fair value 1,101,684 1,081,758
Financial assets at fair value through profit or loss, category [member] | Other Temporary Investments One [Member] | Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Total financial assets, book value 17,864 15,372
Total financial assets, fair value 17,864 15,372
Financial assets at fair value through profit or loss, category [member] | Other Temporary Investments Two [Member] | Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Total financial assets, book value 13,864 10,247
Total financial assets, fair value 13,864 10,247
Financial assets at amortised cost, category [member]    
IfrsStatementLineItems [Line Items]    
Total financial assets, book value 4,690,125 4,600,256
Total financial assets, fair value 4,790,659 4,700,077
Financial assets at amortised cost, category [member] | Collaterals And Escrow Accounts [Member]    
IfrsStatementLineItems [Line Items]    
Total financial assets, book value 9 157
Total financial assets, fair value 9 157
Financial assets at amortised cost, category [member] | Trade Accounts Receivable Financial Assets [Member]    
IfrsStatementLineItems [Line Items]    
Total financial assets, book value 3,866,429 3,451,869
Total financial assets, fair value 3,866,429 3,451,869
Financial assets at amortised cost, category [member] | Sectorial Financial Assets [Member]    
IfrsStatementLineItems [Line Items]    
Total financial assets, book value 30,946 381,398
Total financial assets, fair value 30,946 381,398
Financial assets at amortised cost, category [member] | Accounts Receivable Related To The Concession Bonus From The Grant [Member]    
IfrsStatementLineItems [Line Items]    
Total financial assets, book value 792,741 766,832
Total financial assets, fair value 893,275 866,653
Fair Value Through Other Comprehensive Income [Member]    
IfrsStatementLineItems [Line Items]    
Total financial assets, book value 3,922 10,295
Total financial assets, fair value 3,922 10,295
Fair Value Through Other Comprehensive Income [Member] | Certified Emission Reductions [Member]    
IfrsStatementLineItems [Line Items]    
Total financial assets, book value 3,922 10,295
Total financial assets, fair value R$ 3,922 R$ 10,295