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Concession Financial and Sector Assets and Liabilities - Schedule of Sector Financial Assets and Liabilities Net (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Assets, Beginning Balance R$ 805 R$ 944
Sectorial Financial Assets, Additions 2,669 2,851
Sectorial Financial Assets, Amortization (3,083) (3,915)
Sectorial Financial Assets, Remuneration 299 465
Sectorial Financial Assets, Transfer 606 460
Sectorial Financial Assets, Ending Balance 1,296 805
Sectorial Financial Assets, Amortization 89
Sectorial Financial Assets, Constitution 1,296 716
Sectorial Financial Assets, Current 859 493
Sectorial Financial Assets, Non-current 437 312
Sectorial Financial Liabilities, Beginning Balance
Sectorial Financial Liabilities Additions During the Year (2,205) (2,435)
Sectorial Financial Liabilities, Amortization 3,041 3,288
Sectorial Financial Liabilities, Remuneration (241) (390)
Sectorial Financial Liabilities, Transfer (611) (463)
Sectorial Financial Liabilities, Ending Balance (16)
Sectorial Financial Liabilities, Amortization (16)
Sectorial Financial Liabilities, Constitution
Sectorial Financial Liabilities, Current (16)
Sectorial Financial Liabilities, NonCurrent
Sectorial Financial Assets and Liabilities Net, Beginning Balance 805 944
Sectorial Financial Assets and Liabilities Net, Additions 464 416
Sectorial Financial Assets and Liabilities Net, Amortization (42) (627)
Sectorial Financial Assets and Liabilities Net, Remuneration 58 75
Sectorial Financial Assets and Liabilities Net, Transfer 5 (3)
Sectorial Financial Assets and Liabilities Net, Ending Balance 1,280 805
Sectorial Financial Assets and Liabilities Net, Amortization (16) 89
Sectorial Financial Assets and Liabilities Net, Constitution 1,296 716
Sectorial Financial Assets and Liabilities Net, Current 843 493
Sectorial Financial Assets and Liabilities Net, Non-current 437 312
CVA Assets [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Assets, Beginning Balance (685) (345)
Sectorial Financial Assets, Additions 1,581 1,597
Sectorial Financial Assets, Amortization (1,653) (2,527)
Sectorial Financial Assets, Remuneration 170 4,260
Sectorial Financial Assets, Transfer 728 330 [1]
Sectorial Financial Assets, Ending Balance 141 (685)
Sectorial Financial Assets, Amortization (434)
Sectorial Financial Assets, Constitution 141 (251)
Sectorial Financial Assets, Current 76 (584)
Sectorial Financial Assets, Non-current 65 (101)
Energy aquisition (CVA energy) [Member] | CVA Assets [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Assets, Beginning Balance (1,109) (1,787)
Sectorial Financial Assets, Additions 1,271 1,213
Sectorial Financial Assets, Amortization (952) (1,223)
Sectorial Financial Assets, Remuneration 113 161
Sectorial Financial Assets, Transfer 997 527
Sectorial Financial Assets, Ending Balance 320 (1,109)
Sectorial Financial Assets, Amortization (443)
Sectorial Financial Assets, Constitution 320 (666)
Sectorial Financial Assets, Current 182 (837)
Sectorial Financial Assets, Non-current 138 (272)
Itaipu Energy Costs [Member] | CVA Assets [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Assets, Beginning Balance 29 594
Sectorial Financial Assets, Additions (40)
Sectorial Financial Assets, Amortization (151) (455)
Sectorial Financial Assets, Remuneration 2 44
Sectorial Financial Assets, Transfer 42 (114)
Sectorial Financial Assets, Ending Balance (78) 29
Sectorial Financial Assets, Amortization 143
Sectorial Financial Assets, Constitution (78) (114)
Sectorial Financial Assets, Current (46) 75
Sectorial Financial Assets, Non-current (32) (46)
Program of Incentives for Alternative Electricity Sources - PROINFA [Member] | CVA Assets [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Assets, Beginning Balance (20) 31
Sectorial Financial Assets, Additions 6
Sectorial Financial Assets, Amortization (42)
Sectorial Financial Assets, Remuneration 1
Sectorial Financial Assets, Transfer 20 (10)
Sectorial Financial Assets, Ending Balance 6 (20)
Sectorial Financial Assets, Amortization (19)
Sectorial Financial Assets, Constitution 6 (1)
Sectorial Financial Assets, Current 3 (20)
Sectorial Financial Assets, Non-current 3
Transport Basic Charges [Member] | CVA Assets [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Assets, Beginning Balance 413 215
Sectorial Financial Assets, Additions 305 388
Sectorial Financial Assets, Amortization (381) (265)
Sectorial Financial Assets, Remuneration 38 40
Sectorial Financial Assets, Transfer (126) 35
Sectorial Financial Assets, Ending Balance 249 413
Sectorial Financial Assets, Amortization 114
Sectorial Financial Assets, Constitution 249 299
Sectorial Financial Assets, Current 147 291
Sectorial Financial Assets, Non-current 102 122
Transport of Itaipu Supply [Member] | CVA Assets [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Assets, Beginning Balance 67 18
Sectorial Financial Assets, Additions 18 60
Sectorial Financial Assets, Amortization (58) (20)
Sectorial Financial Assets, Remuneration 6 4
Sectorial Financial Assets, Transfer (37) 5
Sectorial Financial Assets, Ending Balance (4) 67
Sectorial Financial Assets, Amortization 14
Sectorial Financial Assets, Constitution (4) 53
Sectorial Financial Assets, Current (2) 45
Sectorial Financial Assets, Non-current (2) 22
System Service Charges - ESS [Member] | CVA Assets [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Assets, Beginning Balance (62) 583
Sectorial Financial Assets, Additions (42) (24)
Sectorial Financial Assets, Amortization (97) (380)
Sectorial Financial Assets, Remuneration 11 7
Sectorial Financial Assets, Transfer (31) (248)
Sectorial Financial Assets, Ending Balance (221) (62)
Sectorial Financial Assets, Amortization (242)
Sectorial Financial Assets, Constitution (221) 180
Sectorial Financial Assets, Current (131) (136)
Sectorial Financial Assets, Non-current (90) 74
CDE [Member] | CVA Assets [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Assets, Beginning Balance (3) 1
Sectorial Financial Assets, Additions 23
Sectorial Financial Assets, Amortization (14) (142)
Sectorial Financial Assets, Remuneration 3
Sectorial Financial Assets, Transfer (137) 135
Sectorial Financial Assets, Ending Balance (131) (3)
Sectorial Financial Assets, Amortization (1)
Sectorial Financial Assets, Constitution (131) (2)
Sectorial Financial Assets, Current (77) (2)
Sectorial Financial Assets, Non-current (54) (1)
Other Sectoral Financial Assets [Member] | CVA Assets [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Assets, Beginning Balance 1,490 1,289
Sectorial Financial Assets, Additions 1,088 1,254
Sectorial Financial Assets, Amortization (1,430) (1,388)
Sectorial Financial Assets, Remuneration 129 205
Sectorial Financial Assets, Transfer (122) 130
Sectorial Financial Assets, Ending Balance 1,155 1,490
Sectorial Financial Assets, Amortization 523
Sectorial Financial Assets, Constitution 1,155 967
Sectorial Financial Assets, Current 783 1,077
Sectorial Financial Assets, Non-current 372 413
Quotas from Nuclear Energy [Member] | CVA Assets [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Assets, Beginning Balance 138 105
Sectorial Financial Assets, Additions 105 103
Sectorial Financial Assets, Amortization (121) (86)
Sectorial Financial Assets, Remuneration 14 16
Sectorial Financial Assets, Transfer (47)
Sectorial Financial Assets, Ending Balance 89 138
Sectorial Financial Assets, Amortization 51
Sectorial Financial Assets, Constitution 89 87
Sectorial Financial Assets, Current 52 102
Sectorial Financial Assets, Non-current 37 36
Neutrality of Parcel A [Member] | CVA Assets [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Assets, Beginning Balance 386 203
Sectorial Financial Assets, Additions   168
Sectorial Financial Assets, Amortization   (51)
Sectorial Financial Assets, Remuneration   5
Sectorial Financial Assets, Transfer   61
Sectorial Financial Assets, Ending Balance   386
Sectorial Financial Assets, Amortization   (29)
Sectorial Financial Assets, Constitution   415
Sectorial Financial Assets, Current   363
Sectorial Financial Assets, Non-current   23
Neutrality of Parcel A excluding estimated neutrality on distributed generation credits [Member] | CVA Assets [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Assets, Beginning Balance 29  
Sectorial Financial Assets, Additions 142  
Sectorial Financial Assets, Amortization (101)  
Sectorial Financial Assets, Remuneration 8  
Sectorial Financial Assets, Transfer 13  
Sectorial Financial Assets, Ending Balance 91 29
Sectorial Financial Assets, Amortization  
Sectorial Financial Assets, Constitution 91  
Sectorial Financial Assets, Current 54  
Sectorial Financial Assets, Non-current 37  
Estimated neutrality on distributed generation credits [Member] | CVA Assets [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Assets, Beginning Balance 357  
Sectorial Financial Assets, Additions 296  
Sectorial Financial Assets, Amortization  
Sectorial Financial Assets, Remuneration 39  
Sectorial Financial Assets, Transfer  
Sectorial Financial Assets, Ending Balance 692 357
Sectorial Financial Assets, Amortization  
Sectorial Financial Assets, Constitution 692  
Sectorial Financial Assets, Current 692  
Sectorial Financial Assets, Non-current  
Energy Over Contracting [Member] | CVA Assets [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Assets, Beginning Balance 922 750 [2]
Sectorial Financial Assets, Additions 526 643
Sectorial Financial Assets, Amortization (774) (529)
Sectorial Financial Assets, Remuneration 37 58
Sectorial Financial Assets, Transfer (304)
Sectorial Financial Assets, Ending Balance 407 922
Sectorial Financial Assets, Amortization 349
Sectorial Financial Assets, Constitution 407 573
Sectorial Financial Assets, Current 241 688
Sectorial Financial Assets, Non-current 166 234
Tariff Refunds [Member] | CVA Assets [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Assets, Beginning Balance (88) (71)
Sectorial Financial Assets, Additions
Sectorial Financial Assets, Amortization
Sectorial Financial Assets, Remuneration
Sectorial Financial Assets, Transfer 16 (17)
Sectorial Financial Assets, Ending Balance (72) (88)
Sectorial Financial Assets, Amortization (25)
Sectorial Financial Assets, Constitution (72) (63)
Sectorial Financial Assets, Current (48) (67)
Sectorial Financial Assets, Non-current (24) (21)
Other [Member] | CVA Assets [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Assets, Beginning Balance 132 302
Sectorial Financial Assets, Additions 19 340
Sectorial Financial Assets, Amortization (434) (722)
Sectorial Financial Assets, Remuneration 31 126
Sectorial Financial Assets, Transfer 200 86
Sectorial Financial Assets, Ending Balance (52) 132
Sectorial Financial Assets, Amortization 177
Sectorial Financial Assets, Constitution (52) (45)
Sectorial Financial Assets, Current (208) (9)
Sectorial Financial Assets, Non-current 156 141
CVA Liabilities [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Liabilities, Beginning Balance
Sectorial Financial Liabilities Additions During the Year (1,490) (1,706)
Sectorial Financial Liabilities, Amortization 2,286 2,380
Sectorial Financial Liabilities, Remuneration (208) (343)
Sectorial Financial Liabilities, Transfer (728) (331)
Sectorial Financial Liabilities, Ending Balance (140)
Sectorial Financial Liabilities, Amortization (140)
Sectorial Financial Liabilities, Constitution
Sectorial Financial Liabilities, Current (140)
Sectorial Financial Liabilities, NonCurrent
CVA Liabilities [Member] | Energy aquisition (CVA energy) [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Liabilities, Beginning Balance
Sectorial Financial Liabilities Additions During the Year (998) (1,179)
Sectorial Financial Liabilities, Amortization 1,861 1,941
Sectorial Financial Liabilities, Remuneration (193) (234)
Sectorial Financial Liabilities, Transfer (997) (528)
Sectorial Financial Liabilities, Ending Balance (327)
Sectorial Financial Liabilities, Amortization (327)
Sectorial Financial Liabilities, Constitution
Sectorial Financial Liabilities, Current (327)
Sectorial Financial Liabilities, NonCurrent
CVA Liabilities [Member] | Itaipu Energy Costs [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Liabilities, Beginning Balance
Sectorial Financial Liabilities Additions During the Year (113) (109)
Sectorial Financial Liabilities, Amortization 97
Sectorial Financial Liabilities, Remuneration (15) (5)
Sectorial Financial Liabilities, Transfer (42) 114
Sectorial Financial Liabilities, Ending Balance (73)
Sectorial Financial Liabilities, Amortization (73)
Sectorial Financial Liabilities, Constitution
Sectorial Financial Liabilities, Current (73)
Sectorial Financial Liabilities, NonCurrent
CVA Liabilities [Member] | Program of Incentives for Alternative Electricity Sources - PROINFA [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Liabilities, Beginning Balance
Sectorial Financial Liabilities Additions During the Year (18) (31)
Sectorial Financial Liabilities, Amortization 30 25
Sectorial Financial Liabilities, Remuneration (2) (4)
Sectorial Financial Liabilities, Transfer (20) 10
Sectorial Financial Liabilities, Ending Balance (10)
Sectorial Financial Liabilities, Amortization (10)
Sectorial Financial Liabilities, Constitution
Sectorial Financial Liabilities, Current (10)
Sectorial Financial Liabilities, NonCurrent
CVA Liabilities [Member] | Transport Basic Charges [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Liabilities, Beginning Balance
Sectorial Financial Liabilities Additions During the Year
Sectorial Financial Liabilities, Amortization 30 35
Sectorial Financial Liabilities, Remuneration
Sectorial Financial Liabilities, Transfer 126 (35)
Sectorial Financial Liabilities, Ending Balance 156
Sectorial Financial Liabilities, Amortization 156
Sectorial Financial Liabilities, Constitution
Sectorial Financial Liabilities, Current 156
Sectorial Financial Liabilities, NonCurrent
CVA Liabilities [Member] | Transport of Itaipu Supply [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Liabilities, Beginning Balance
Sectorial Financial Liabilities Additions During the Year (5)
Sectorial Financial Liabilities, Amortization 5
Sectorial Financial Liabilities, Remuneration 1
Sectorial Financial Liabilities, Transfer 37 (5)
Sectorial Financial Liabilities, Ending Balance 33
Sectorial Financial Liabilities, Amortization 33
Sectorial Financial Liabilities, Constitution
Sectorial Financial Liabilities, Current 33
Sectorial Financial Liabilities, NonCurrent
CVA Liabilities [Member] | System Service Charges - ESS [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Liabilities, Beginning Balance
Sectorial Financial Liabilities Additions During the Year (224) (506)
Sectorial Financial Liabilities, Amortization 266 371
Sectorial Financial Liabilities, Remuneration (2) (113)
Sectorial Financial Liabilities, Transfer 31 248
Sectorial Financial Liabilities, Ending Balance 71
Sectorial Financial Liabilities, Amortization 71
Sectorial Financial Liabilities, Constitution
Sectorial Financial Liabilities, Current 71
Sectorial Financial Liabilities, NonCurrent
CVA Liabilities [Member] | CDE [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Liabilities, Beginning Balance
Sectorial Financial Liabilities Additions During the Year (132) 119
Sectorial Financial Liabilities, Amortization 2 3
Sectorial Financial Liabilities, Remuneration 3 13
Sectorial Financial Liabilities, Transfer 137 (135)
Sectorial Financial Liabilities, Ending Balance 10
Sectorial Financial Liabilities, Amortization 10
Sectorial Financial Liabilities, Constitution
Sectorial Financial Liabilities, Current 10
Sectorial Financial Liabilities, NonCurrent
CVA Liabilities [Member] | Other Sectoral Financial Liabilities [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Liabilities, Beginning Balance
Sectorial Financial Liabilities Additions During the Year (715) (729)
Sectorial Financial Liabilities, Amortization 755 908
Sectorial Financial Liabilities, Remuneration (33) (47)
Sectorial Financial Liabilities, Transfer 117 (132)
Sectorial Financial Liabilities, Ending Balance 124
Sectorial Financial Liabilities, Amortization 124
Sectorial Financial Liabilities, Constitution
Sectorial Financial Liabilities, Current 124
Sectorial Financial Liabilities, NonCurrent
CVA Liabilities [Member] | Quotas from Nuclear Energy [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Liabilities, Beginning Balance  
Sectorial Financial Liabilities Additions During the Year  
Sectorial Financial Liabilities, Amortization 2  
Sectorial Financial Liabilities, Remuneration  
Sectorial Financial Liabilities, Transfer 47  
Sectorial Financial Liabilities, Ending Balance 49
Sectorial Financial Liabilities, Amortization 49  
Sectorial Financial Liabilities, Constitution  
Sectorial Financial Liabilities, Current 49  
Sectorial Financial Liabilities, NonCurrent  
CVA Liabilities [Member] | Neutrality of Parcel A [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Liabilities, Beginning Balance
Sectorial Financial Liabilities Additions During the Year (33) (58)
Sectorial Financial Liabilities, Amortization 82 124
Sectorial Financial Liabilities, Remuneration (2) (5)
Sectorial Financial Liabilities, Transfer (13) (61)
Sectorial Financial Liabilities, Ending Balance 34
Sectorial Financial Liabilities, Amortization 34
Sectorial Financial Liabilities, Constitution
Sectorial Financial Liabilities, Current 34
Sectorial Financial Liabilities, NonCurrent
CVA Liabilities [Member] | Energy Over Contracting [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Liabilities, Beginning Balance  
Sectorial Financial Liabilities Additions During the Year  
Sectorial Financial Liabilities, Amortization  
Sectorial Financial Liabilities, Remuneration  
Sectorial Financial Liabilities, Transfer 304  
Sectorial Financial Liabilities, Ending Balance 304
Sectorial Financial Liabilities, Amortization 304  
Sectorial Financial Liabilities, Constitution  
Sectorial Financial Liabilities, Current 304  
Sectorial Financial Liabilities, NonCurrent  
CVA Liabilities [Member] | Tariff Refunds [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Liabilities, Beginning Balance
Sectorial Financial Liabilities Additions During the Year (99) (88)
Sectorial Financial Liabilities, Amortization 88 73
Sectorial Financial Liabilities, Remuneration (3) (2)
Sectorial Financial Liabilities, Transfer (16) 17
Sectorial Financial Liabilities, Ending Balance (30)
Sectorial Financial Liabilities, Amortization (30)
Sectorial Financial Liabilities, Constitution
Sectorial Financial Liabilities, Current (30)
Sectorial Financial Liabilities, NonCurrent
CVA Liabilities [Member] | Other [Member]    
Disclosure of detailed information about service concession arrangements [line items]    
Sectorial Financial Liabilities, Beginning Balance
Sectorial Financial Liabilities Additions During the Year (583) (583)
Sectorial Financial Liabilities, Amortization 583 711
Sectorial Financial Liabilities, Remuneration (28) (40)
Sectorial Financial Liabilities, Transfer (205) (88)
Sectorial Financial Liabilities, Ending Balance (233)
Sectorial Financial Liabilities, Amortization (233)
Sectorial Financial Liabilities, Constitution
Sectorial Financial Liabilities, Current (233)
Sectorial Financial Liabilities, NonCurrent
[1]

In addition to the transfers between sectoral financial assets and liabilities, there was a transfer of R$1,550 to the "Other assets" group.
[2]

Reversal of the over contracting amounts passed on to consumers in the 2018 and 2019 tariff adjustments because they were previously recognized by ANEEL as involuntary over contracting, made possible by the publication of the involuntariness orders, recognizing over contracting as voluntary. Regarding the amount constituted in the period, there is a high volume of surplus energy, mainly due to the growing increase in the energy injected by MMGD facilities, settled at a low PLD.