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Operating Segments (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
OPERATING COSTS AND EXPENSES R$ (18,092,563) R$ (17,254,583) R$ (16,415,740)
PROFIT (LOSS) BEFORE FINANCIAL      
Financial income 1,069,116 956,413 901,605
Income tax and social contribution (354,057) 281,099 (1,178,524)
NET INCOME 2,327,168 1,149,321 5,048,602
 PIS and Cofins credits (1,011,370)
Hydrological risk renegotiation (GSF) (1,570,543)
Elimination of intersegment amounts [member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES (2,940,384) (3,459,469) (3,954,054)
Net operating revenue - third-parties
Net operating revenue - between segments (2,940,384) (3,459,469) (3,954,054)
OPERATING COSTS AND EXPENSES 2,940,384 3,459,469 4,055,448
Energy purchased for resale 2,492,703 3,059,851 3,504,199
Charges for use of the main transmission grid 442,919 392,098 386,372
Personnel and management
Pension and healthcare plans
Materials and supplies 2
Raw materials and supplies for generation  1,301 2,870 23,867
Natural gas and supplies for gas business
Third party services 3,337 6,627 21,597
Depreciation and amortization 72,726
Provision (reversal) for litigations
Impairment of assets
Other estimated losses, provisions and reversals 28,662
Construction cost
Other operating costs and expenses, net 124 (1,977) 18,023
EQUITY IN EARNINGS OF INVESTEES
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX  101,394
Financial income (23,343) (6,777) (20,844)
Financial expenses 23,343 6,777 20,844
OPERATING PROFIT (LOSS) 101,394
Income tax and social contribution (24,726)
NET INCOME(LOSS) FROM CONTINUING OPERATIONS 76,668
Result of discontinued operations
NET INCOME 76,668
Provision for allocation of PIS and Cofins credits    
 PIS and Cofins credits    
Hydrological risk renegotiation (GSF)    
Electricity Get GER [member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES 4,179,457 4,099,740 6,185,468
Net operating revenue - third-parties 1,764,212 1,369,563 3,823,917
Net operating revenue - between segments 2,415,245 2,730,177 2,361,551
OPERATING COSTS AND EXPENSES (2,372,792) (2,766,048) (3,312,461)
Energy purchased for resale (214,198) (386,210) (1,279,857)
Charges for use of the main transmission grid (658,229) (599,422) (524,562)
Personnel and management (368,744) (207,684) (281,498)
Pension and healthcare plans (49,626) (48,973) (44,166)
Materials and supplies (20,937) (13,227) (9,863)
Raw materials and supplies for generation  (19,113) (123,279) (1,878,815)
Natural gas and supplies for gas business
Third party services (242,712) (207,239) (203,823)
Depreciation and amortization (843,480) (783,828) (616,267)
Provision (reversal) for litigations (8,204) (17,503) (25,238)
Impairment of assets 285,825 (82,758) 150,697
Other estimated losses, provisions and reversals (7,109) (992) (1,041)
Construction cost
Other operating costs and expenses, net (226,265) (294,933) (168,571)
EQUITY IN EARNINGS OF INVESTEES 16,651 20,370 16,596
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX  1,823,316 1,354,062 2,889,603
Financial income 333,990 210,356 128,461
Financial expenses (791,547) (669,382) (506,541)
OPERATING PROFIT (LOSS) 1,365,759 895,036 2,511,523
Income tax and social contribution (228,373) (241,816) (675,107)
NET INCOME(LOSS) FROM CONTINUING OPERATIONS 1,137,386 653,220 1,836,416
Result of discontinued operations
NET INCOME 1,137,386 653,220 1,836,416
Provision for allocation of PIS and Cofins credits    
 PIS and Cofins credits    
Hydrological risk renegotiation (GSF)     1,570,543
Electricity Get TRA [member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES 1,096,351 1,140,734 1,541,080
Net operating revenue - third-parties 687,829 781,448 1,181,374
Net operating revenue - between segments 408,522 359,286 359,706
OPERATING COSTS AND EXPENSES (474,506) (303,450) (457,137)
Energy purchased for resale (14,741)
Charges for use of the main transmission grid
Personnel and management (247,393) (123,528) (167,041)
Pension and healthcare plans (33,003) (30,948) (27,954)
Materials and supplies (5,583) (5,297) (4,161)
Raw materials and supplies for generation 
Natural gas and supplies for gas business
Third party services (50,019) (37,041) (30,699)
Depreciation and amortization (16,207) (13,692) (11,431)
Provision (reversal) for litigations (12,777) (951) (9,151)
Impairment of assets (155)
Other estimated losses, provisions and reversals (2,334) 3,065 (3,498)
Construction cost (85,181) (89,166) (187,733)
Other operating costs and expenses, net (7,268) (5,892) (15,314)
EQUITY IN EARNINGS OF INVESTEES 283,939 450,235 339,774
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX  905,784 1,287,519 1,423,717
Financial income 66,922 58,514 19,542
Financial expenses (344,524) (272,287) (160,961)
OPERATING PROFIT (LOSS) 628,182 1,073,746 1,282,298
Income tax and social contribution 1,779 (56,354) (262,395)
NET INCOME(LOSS) FROM CONTINUING OPERATIONS 629,961 1,017,392 1,019,903
Result of discontinued operations
NET INCOME 629,961 1,017,392 1,019,903
Provision for allocation of PIS and Cofins credits    
 PIS and Cofins credits    
Hydrological risk renegotiation (GSF)    
Electricity Energy DIS [member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES 15,085,707 13,903,300 14,836,392
Net operating revenue - third-parties 15,048,581 13,866,122 14,785,432
Net operating revenue - between segments 37,126 37,178 50,960
OPERATING COSTS AND EXPENSES (13,983,117) (13,418,798) (13,669,382)
Energy purchased for resale (6,074,752) (5,980,124) (7,277,499)
Charges for use of the main transmission grid (2,715,273) (2,313,203) (2,363,451)
Personnel and management (1,174,906) (599,121) (905,338)
Pension and healthcare plans (167,533) (169,493) (155,774)
Materials and supplies (74,501) (71,302) (51,722)
Raw materials and supplies for generation 
Natural gas and supplies for gas business
Third party services (643,999) (505,407) (450,752)
Depreciation and amortization (521,301) (454,307) (406,632)
Provision (reversal) for litigations (101,960) (162,414) (89,662)
Impairment of assets
Other estimated losses, provisions and reversals (99,123) (119,481) (127,334)
Construction cost (2,234,539) (2,048,022) (1,700,889)
Other operating costs and expenses, net (175,230) (185,361) (140,329)
EQUITY IN EARNINGS OF INVESTEES
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX  1,102,590 484,502 1,167,010
Financial income 479,944 593,726 457,697
Financial expenses (955,046) (752,097) (391,228)
OPERATING PROFIT (LOSS) 627,488 (685,239) 1,233,479
Income tax and social contribution (58,368) 455,465 (375,597)
NET INCOME(LOSS) FROM CONTINUING OPERATIONS 569,120 (229,774) 857,882
Result of discontinued operations
NET INCOME 569,120 (229,774) 857,882
Provision for allocation of PIS and Cofins credits   (810,563)  
 PIS and Cofins credits   (1,011,370)  
Hydrological risk renegotiation (GSF)    
Electricity Energy COM [member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES 4,056,904 4,938,368 4,536,414
Net operating revenue - third-parties 3,978,846 4,608,702 3,395,592
Net operating revenue - between segments 78,058 329,666 1,140,822
OPERATING COSTS AND EXPENSES (3,948,286) (4,814,710) (4,478,439)
Energy purchased for resale (3,908,484) (4,790,427) (4,450,586)
Charges for use of the main transmission grid
Personnel and management (21,133) (12,712) (18,568)
Pension and healthcare plans (1,877) (1,787) (1,547)
Materials and supplies (77) (53) (17)
Raw materials and supplies for generation 
Natural gas and supplies for gas business
Third party services (3,389) (2,665) (2,925)
Depreciation and amortization (2,003) (353) (234)
Provision (reversal) for litigations (233) 31 (295)
Impairment of assets
Other estimated losses, provisions and reversals (3,694) (1,755) (511)
Construction cost
Other operating costs and expenses, net (7,396) (4,989) (3,756)
EQUITY IN EARNINGS OF INVESTEES
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX  108,618 123,658 57,975
Financial income 38,577 32,667 14,151
Financial expenses (717) (291) (211)
OPERATING PROFIT (LOSS) 146,478 156,034 71,915
Income tax and social contribution (40,928) (47,659) (18,190)
NET INCOME(LOSS) FROM CONTINUING OPERATIONS 105,550 108,375 53,725
Result of discontinued operations
NET INCOME 105,550 108,375 53,725
Provision for allocation of PIS and Cofins credits    
 PIS and Cofins credits    
Hydrological risk renegotiation (GSF)    
GAS [member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES 978,581 1,297,034 783,277
Net operating revenue - third-parties 17,014 1,293,872 757,494
Net operating revenue - between segments 961,567 3,162 25,783
OPERATING COSTS AND EXPENSES (814,455) (1,076,181) (654,643)
Energy purchased for resale
Charges for use of the main transmission grid
Personnel and management (43,201) (42,166) (39,121)
Pension and healthcare plans (6,222) (5,366) (5,154)
Materials and supplies (1,574) (1,644) (3,590)
Raw materials and supplies for generation 
Natural gas and supplies for gas business (678,885) (939,516) (506,065)
Third party services (13,861) (13,316) (13,850)
Depreciation and amortization (41,148) (44,190) (41,178)
Provision (reversal) for litigations (263) (24) (15,510)
Impairment of assets (1,629) (15,688)
Other estimated losses, provisions and reversals (285) (1,064) 2,611
Construction cost (17,010) (12,024) (11,222)
Other operating costs and expenses, net (12,006) (15,242) (5,876)
EQUITY IN EARNINGS OF INVESTEES
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX  164,126 220,853 128,634
Financial income 36,559 56,730 19,422
Financial expenses (48,316) (28,290) (9,605)
OPERATING PROFIT (LOSS) 152,369 249,293 138,451
Income tax and social contribution (40,750) (70,092) (38,860)
NET INCOME(LOSS) FROM CONTINUING OPERATIONS 111,619 179,201 99,591
Result of discontinued operations
NET INCOME 111,619 179,201 99,591
Provision for allocation of PIS and Cofins credits    
 PIS and Cofins credits    
Hydrological risk renegotiation (GSF)    
Holding And Services [Member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES 8,014 40,478
Net operating revenue - third-parties 8,014 40,478
Net operating revenue - between segments
OPERATING COSTS AND EXPENSES (218,272) (570,344) (246,871)
Energy purchased for resale
Charges for use of the main transmission grid
Personnel and management (72,537) (41,651) (99,926)
Pension and healthcare plans (8,853) (9,614) (7,889)
Materials and supplies (1,609) (924) (471)
Raw materials and supplies for generation 
Natural gas and supplies for gas business
Third party services (68,186) (41,702) (26,147)
Depreciation and amortization (4,700) (4,612) (3,515)
Provision (reversal) for litigations (44,815) (445,741) (50,215)
Impairment of assets
Other estimated losses, provisions and reversals (28,662)
Construction cost
Other operating costs and expenses, net (17,572) (26,100) (30,046)
EQUITY IN EARNINGS OF INVESTEES 7,219 7,972 9,944
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX  (211,053) (554,358) (196,449)
Financial income 182,829 87,621 313,617
Financial expenses (203,206) (271,934) (211,708)
OPERATING PROFIT (LOSS) (231,430) (738,671) (94,540)
Income tax and social contribution 4,962 159,578 93,879
NET INCOME(LOSS) FROM CONTINUING OPERATIONS (226,468) (579,093) (661)
Result of discontinued operations 1,116,379
NET INCOME (226,468) (579,093) 1,115,718
Provision for allocation of PIS and Cofins credits    
 PIS and Cofins credits    
Hydrological risk renegotiation (GSF)    
Reclassifications Note 39 [member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES (977,148) (1,392,380) (3,008,071)
Net operating revenue - third-parties (17,014) (1,392,380) (3,008,071)
Net operating revenue - between segments (960,134)
OPERATING COSTS AND EXPENSES 778,481 1,424,916 2,488,823
Energy purchased for resale 3,282
Charges for use of the main transmission grid 33,873 32,530 27,941
Personnel and management 49,582 48,958 44,889
Pension and healthcare plans 6,955 5,984 5,754
Materials and supplies 1,614 1,906 3,634
Raw materials and supplies for generation  158 111,060 1,854,948
Natural gas and supplies for gas business 678,885 939,516 506,065
Third party services 22,517 46,192 69,983
Depreciation and amortization 46,799 67,885 65,247
Provision (reversal) for litigations 10,584 2,860 15,846
Impairment of assets (108,132) 109,761 (123,089)
Other estimated losses, provisions and reversals 285 1,064 (2,611)
Construction cost 17,010 12,024 11,222
Other operating costs and expenses, net 15,069 45,176 8,994
EQUITY IN EARNINGS OF INVESTEES
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX  (198,667) 32,536 (519,248)
Financial income (46,362) (76,424) (30,444)
Financial expenses 45,907 36,577 11,440
OPERATING PROFIT (LOSS) (199,122) (7,311) (538,252)
Income tax and social contribution 7,621 81,977 81,108
NET INCOME(LOSS) FROM CONTINUING OPERATIONS (191,501) 74,666 (457,144)
Result of discontinued operations 191,501 (74,666) 457,144
NET INCOME
Provision for allocation of PIS and Cofins credits    
 PIS and Cofins credits    
Hydrological risk renegotiation (GSF)    
Total [Member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES 21,479,468 20,535,341 20,976,216
Net operating revenue - third-parties 21,479,468 20,535,341 20,976,216
Net operating revenue - between segments
OPERATING COSTS AND EXPENSES (18,092,563) (18,065,146) (16,415,740)
Energy purchased for resale (7,716,190) (8,096,910) (9,503,743)
Charges for use of the main transmission grid (2,896,710) (2,487,997) (2,473,700)
Personnel and management (1,878,332) (977,904) (1,505,968)
Pension and healthcare plans (260,159) (260,197) (243,019)
Materials and supplies (102,667) (90,541) (66,188)
Raw materials and supplies for generation  (17,654) (9,349)
Natural gas and supplies for gas business
Third party services (996,312) (754,551) (636,616)
Depreciation and amortization (1,382,040) (1,233,097) (1,017,292)
Provision (reversal) for litigations (157,668) (623,742) (174,225)
Impairment of assets 177,693 25,374 11,765
Other estimated losses, provisions and reversals (112,260) (119,163) (132,384)
Construction cost (2,319,720) (2,137,188) (1,888,622)
Other operating costs and expenses, net (430,544) (489,318) (356,291)
EQUITY IN EARNINGS OF INVESTEES 307,809 478,577 366,314
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX  3,694,714 2,948,772 4,926,790
Financial income 1,069,116 956,413 901,605
Financial expenses (2,274,106) (1,950,927) (1,247,970)
OPERATING PROFIT (LOSS) 2,489,724 942,888 4,580,425
Income tax and social contribution (354,057) 281,099 (1,178,524)
NET INCOME(LOSS) FROM CONTINUING OPERATIONS 2,135,667 1,223,987 3,401,901
Result of discontinued operations 191,501 (74,666) 1,646,701
NET INCOME R$ 2,327,168 1,149,321 5,048,602
Provision for allocation of PIS and Cofins credits   (810,563)  
 PIS and Cofins credits   R$ (1,011,370)  
Hydrological risk renegotiation (GSF)     1,570,543
Tel [Member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES     243,611
Net operating revenue - third-parties     228,379
Net operating revenue - between segments     15,232
OPERATING COSTS AND EXPENSES     (222,883)
Energy purchased for resale    
Charges for use of the main transmission grid    
Personnel and management     (39,365)
Pension and healthcare plans     (6,289)
Materials and supplies     (965)
Raw materials and supplies for generation     
Natural gas and supplies for gas business    
Third party services     (38,690)
Depreciation and amortization     (77,901)
Provision (reversal) for litigations     4,845
Impairment of assets     5,156
Other estimated losses, provisions and reversals     (8,612)
Construction cost    
Other operating costs and expenses, net     (61,062)
EQUITY IN EARNINGS OF INVESTEES    
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX      20,728
Financial income     19,183
Financial expenses     (44,928)
OPERATING PROFIT (LOSS)     (5,017)
Income tax and social contribution     (6,284)
NET INCOME(LOSS) FROM CONTINUING OPERATIONS     (11,301)
Result of discontinued operations    
NET INCOME     (11,301)
Hydrological risk renegotiation (GSF)    
Reclassifications A [Member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES     (228,379)
Net operating revenue - third-parties     (228,379)
Net operating revenue - between segments    
OPERATING COSTS AND EXPENSES     81,805
Energy purchased for resale    
Charges for use of the main transmission grid    
Personnel and management    
Pension and healthcare plans    
Materials and supplies     965
Raw materials and supplies for generation     
Natural gas and supplies for gas business    
Third party services     38,690
Depreciation and amortization     1,893
Provision (reversal) for litigations     (4,845)
Impairment of assets     (5,156)
Other estimated losses, provisions and reversals     8,612
Construction cost    
Other operating costs and expenses, net     41,646
EQUITY IN EARNINGS OF INVESTEES    
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX      (146,574)
Financial income     (19,180)
Financial expenses     44,928
OPERATING PROFIT (LOSS)     (120,826)
Income tax and social contribution     47,648
NET INCOME(LOSS) FROM CONTINUING OPERATIONS     (73,178)
Result of discontinued operations     73,178
NET INCOME    
Hydrological risk renegotiation (GSF)