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Investments (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Joint Ventures [Line Items]    
Investments, beginning R$ 3,511,797 R$ 3,325,731
Equity 281,202 307,809
Investment AFAC   10,780
Capital decrease (37,129)  
Amortization   (370)
Dividends and JSCP (175,636) (132,065)
Other (2,297) (88)
Investments, ending 3,577,937 3,511,797
Total for all associates [Member]    
Disclosure Of Joint Ventures [Line Items]    
Investments, beginning 48,856 47,093
Equity 19,783 22,001
Investment AFAC   0
Capital decrease 0  
Amortization   0
Dividends and JSCP (16,839) (20,238)
Other (1,929) 0
Investments, ending 49,871 48,856
Investment property [Member]    
Disclosure Of Joint Ventures [Line Items]    
Investments, beginning 444 535
Equity 0 0
Investment AFAC   0
Capital decrease 0  
Amortization   (3)
Dividends and JSCP 0 0
Other (1) (88)
Investments, ending 443 444
Dona Francisca Energetica [Member] | Total for all associates [Member]    
Disclosure Of Joint Ventures [Line Items]    
Investments, beginning 30,812 28,043
Equity 5,354 5,353
Investment AFAC   0
Capital decrease 0  
Amortization   0
Dividends and JSCP (1,441) (2,584)
Other 0 0
Investments, ending 34,725 30,812
Foz Do Chopim Energetica [Member] | Total for all associates [Member]    
Disclosure Of Joint Ventures [Line Items]    
Investments, beginning 16,113 17,116
Equity 14,431 16,651
Investment AFAC   0
Capital decrease 0  
Amortization   0
Dividends and JSCP (15,398) (17,654)
Other 0 0
Investments, ending 15,146 16,113
Others [Member] | Total for all associates [Member]    
Disclosure Of Joint Ventures [Line Items]    
Investments, beginning 1,931 1,934
Equity (2) (3)
Investment AFAC   0
Capital decrease 0  
Amortization   0
Dividends and JSCP 0 0
Other (1,929) 0
Investments, ending 0 1,931
Total for all joint ventures [Member]    
Disclosure Of Joint Ventures [Line Items]    
Investments, beginning 3,462,497 3,278,103
Equity 261,419 285,808
Investment AFAC   10,780
Capital decrease (37,129)  
Amortization   (367)
Dividends and JSCP (158,797) (111,827)
Other (367) 0
Investments, ending 3,527,623 3,462,497
Total for all joint ventures [Member] | Voltalia Sao Miguel Do Gostoso I [Member]    
Disclosure Of Joint Ventures [Line Items]    
Investments, beginning 117,484 115,976
Equity (1,259) 1,508
Investment AFAC   0
Capital decrease 0  
Amortization   0
Dividends and JSCP 0 0
Other 0 0
Investments, ending 116,225 117,484
Total for all joint ventures [Member] | Voltalia Sao Miguel Do Gostoso Direito De Authorization Rights [Member]    
Disclosure Of Joint Ventures [Line Items]    
Investments, beginning 8,570 8,937
Equity 0 0
Investment AFAC   0
Capital decrease 0  
Amortization   (367)
Dividends and JSCP 0 0
Other (367) 0
Investments, ending 8,203 8,570
Total for all joint ventures [Member] | Caiua [Member]    
Disclosure Of Joint Ventures [Line Items]    
Investments, beginning 133,074 125,297
Equity 12,641 12,263
Investment AFAC   0
Capital decrease 0  
Amortization   0
Dividends and JSCP (7,017) (4,486)
Other 0 0
Investments, ending 138,698 133,074
Total for all joint ventures [Member] | Integracao Maranhense [Member]    
Disclosure Of Joint Ventures [Line Items]    
Investments, beginning 212,060 192,502
Equity 18,623 24,218
Investment AFAC   10,780
Capital decrease 0  
Amortization   0
Dividends and JSCP (16,209) (15,440)
Other 0 0
Investments, ending 214,474 212,060
Total for all joint ventures [Member] | Matrincha [Member]    
Disclosure Of Joint Ventures [Line Items]    
Investments, beginning 994,999 931,528
Equity 79,117 77,493
Investment AFAC   0
Capital decrease 0  
Amortization   0
Dividends and JSCP (44,918) (14,022)
Other 0 0
Investments, ending 1,029,198 994,999
Total for all joint ventures [Member] | Guaraciaba [Member]    
Disclosure Of Joint Ventures [Line Items]    
Investments, beginning 492,083 467,099
Equity 31,193 30,871
Investment AFAC   0
Capital decrease 0  
Amortization   0
Dividends and JSCP (5,362) (5,887)
Other 0 0
Investments, ending 517,914 492,083
Total for all joint ventures [Member] | Paranaiba [Member]    
Disclosure Of Joint Ventures [Line Items]    
Investments, beginning 292,022 263,979
Equity 29,908 36,269
Investment AFAC   0
Capital decrease 0  
Amortization   0
Dividends and JSCP (8,324) (8,226)
Other 0 0
Investments, ending 313,606 292,022
Total for all joint ventures [Member] | Mata De Santa Genebra [Member]    
Disclosure Of Joint Ventures [Line Items]    
Investments, beginning 736,685 692,260
Equity 48,533 58,262
Investment AFAC   0
Capital decrease (37,129)  
Amortization   0
Dividends and JSCP (53,038) (13,837)
Other 0 0
Investments, ending 695,051 736,685
Total for all joint ventures [Member] | Cantareira [Member]    
Disclosure Of Joint Ventures [Line Items]    
Investments, beginning 468,311 473,369
Equity 42,448 44,563
Investment AFAC   0
Capital decrease 0  
Amortization   0
Dividends and JSCP (23,840) (49,621)
Other 0 0
Investments, ending 486,919 468,311
Total for all joint ventures [Member] | Solar Parana [Member]    
Disclosure Of Joint Ventures [Line Items]    
Investments, beginning 7,209 7,156
Equity 215 361
Investment AFAC   0
Capital decrease 0  
Amortization   0
Dividends and JSCP (89) (308)
Other 0 0
Investments, ending R$ 7,335 R$ 7,209