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Intangible assets (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning R$ 9,215,560  
Effect of acquisition of control of Vilas Complex   R$ 22,381
Intangible assets, ending 10,277,727 9,215,560
Generation Concession Agreement In Service [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning 1,759,286 195,622
ANEEL grant - use of public property   63,446
Amortization of quotas - concession and authorization [1] (228,509) (72,148)
Capitalizations for intangible in service   1,823
Hydrological Risk Renegotiation   1,570,543
Intangible assets, ending 1,530,777 1,759,286
Generation Concession Agreement In Progress [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning [2]
ANEEL grant - use of public property [2]   1,823
Capitalizations for intangible in service [2]   (1,823)
Intangible assets, ending [2]
Generation Concession Agreement Concession Authoriztion Rights [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning 714,572 358,218
Effect of acquisition of control of Vilas Complex 23,982 277,120
Goodwill arising from the business combination 8,154 94,221
Amortization of quotas - concession and authorization [1] (24,870) (14,987)
Intangible assets, ending 721,838 714,572
Generation Concession Agreement [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning 2,473,858 553,840
Effect of acquisition of control of Vilas Complex 23,982 277,120
Goodwill arising from the business combination 8,154 94,221
ANEEL grant - use of public property   65,269
Amortization of quotas - concession and authorization [1] (253,379) (87,135)
Hydrological Risk Renegotiation   1,570,543
Intangible assets, ending R$ 2,252,615 R$ 2,473,858
[1] Amortization during the concession/authorization as of the start of commercial operations of the enterprises.
[2] Includes the balances of use of public asset and hydrological risk renegotiation