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Research and Development and Energy Efficiency (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of fair value measurement of liabilities [line items]    
Beginning balance R$ 553,674 R$ 614,758
Additions 174,616 161,039
Performance agreement 7,059 4,420
Interest rate (Note 32) 22,050 26,009
Transfers 0 10,441
Payments (151,804) (96,092)
Concluded projects (185,152) (159,203)
Reclassification   (7,698)
Ending balance 420,443 553,674
F N D C T [Member]    
Disclosure of fair value measurement of liabilities [line items]    
Beginning balance 5,781 6,588
Additions 41,949 40,011
Performance agreement 0 0
Interest rate (Note 32) 0 0
Transfers 0 5,802
Payments (40,513) (46,620)
Concluded projects 0 0
Reclassification   0
Ending balance 7,217 5,781
M M E [Member]    
Disclosure of fair value measurement of liabilities [line items]    
Beginning balance 2,891 3,314
Additions 20,973 20,004
Performance agreement 0 0
Interest rate (Note 32) 0 0
Transfers 0 2,900
Payments (20,256) (23,327)
Concluded projects 0 0
Reclassification   0
Ending balance 3,608 2,891
R And D [Member]    
Disclosure of fair value measurement of liabilities [line items]    
Beginning balance 201,871 260,243
Additions 41,960 40,019
Performance agreement 0 0
Interest rate (Note 32) 4,452 4,938
Transfers 0 1,739
Payments (11,252) (9,695)
Concluded projects (127,798) (87,675)
Reclassification   (7,698)
Ending balance 109,233 201,871
Procel [Member]    
Disclosure of fair value measurement of liabilities [line items]    
Beginning balance 23,613 11,960
Additions 13,947 12,200
Performance agreement 0 0
Interest rate (Note 32) 1,495 (547)
Transfers (4,066) 0
Payments (30,667) 0
Concluded projects 0 0
Reclassification   0
Ending balance 4,322 23,613
Energy Efficiency Program [Member]    
Disclosure of fair value measurement of liabilities [line items]    
Beginning balance 319,518 332,653
Additions 55,787 48,805
Performance agreement 7,059 4,420
Interest rate (Note 32) 16,103 21,618
Transfers 4,066 0
Payments (49,116) (16,450)
Concluded projects (57,354) (71,528)
Reclassification   0
Ending balance R$ 296,063 R$ 319,518