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Financial Instruments (Details 10) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Less: Cash and cash equivalents R$ (2,678,457) R$ (3,472,845) R$ (3,222,768)
Net income 1,149,321 5,048,602 3,909,750
Deferred IRPJ and CSLL (628,389) 790,406 24,896
Provision for IRPJ and CSLL 429,267 469,226 1,260,469
Depreciation and amortization 1,300,982 1,082,539 R$ 1,009,912
Capital Management [Member]      
IfrsStatementLineItems [Line Items]      
Loans and financing 4,650,363 3,678,444  
Debentures 7,803,855 8,147,617  
Less: Cash and cash equivalents (2,678,457) (3,472,845)  
Less: Bonds and securities (current) (93) (16,121)  
Less: Bonds and securities (noncurrent) - debt contract guarantees (290,602) (237,183)  
Less: Collaterals and escrow accounts STN (0) (142,764)  
Adjusted net debt 9,485,066 7,957,148  
Net income 1,149,321 3,859,045  
Equity in earnings of investees (478,577) (366,314)  
Deferred IRPJ and CSLL (628,389) 790,406  
Provision for IRPJ and CSLL 429,267 469,226  
Financial expenses (income), net 1,966,037 327,361  
Depreciation and amortization 1,300,982 1,082,539  
Hydrological Risk Renegotiation - GSF (0) (1,570,543)  
Provision for allocation of PIS and Cofins credits 810,563 (0)  
(-/+) Impairment 84,387 (134,854)  
Ebitda from discontinued operations (0) 1,872,381  
Adjusted ebitda R$ 4,633,591 R$ 6,329,247  
Adjusted net debt / Ebitda (in R$ per share) R$ 2.05 R$ 1.26