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Operating Segments (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
OPERATING COSTS AND EXPENSES R$ (18,679,499) R$ (20,475,106) R$ (14,573,530)
PROFIT (LOSS) BEFORE FINANCIAL      
Financial income 1,032,837 932,049 895,119
Financial expenses (1,987,504) (1,259,410) (973,397)
 PIS and Cofins credits (1,011,370) (944,549)
Income tax and social contribution 199,122 (1,259,632) (1,285,365)
NET INCOME (LOSS) 1,149,321 5,048,602 3,909,750
Hydrological risk renegotiation (GSF) (1,570,543)
NET INCOME (LOSS) - CONTINUING OPERATIONS 1,149,321 3,859,045 3,834,172
Result of discontinued operations 1,189,557 75,578
Electricity Get Ger [Member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES 4,099,740 6,185,468 4,030,979
Net operating revenues - third-parties 1,369,563 3,823,917 2,599,807
Net operating revenues - between segments 2,730,177 2,361,551 1,431,172
OPERATING COSTS AND EXPENSES (2,766,048) (3,312,461) (2,348,409)
Energy purchased for resale (386,210) (1,279,857) (260,650)
Charges for use of the main transmission grid (599,422) (524,562) (489,921)
Personnel and management (207,684) (281,498) (277,905)
Pension and healthcare plans (48,973) (44,166) (38,196)
Materials and supplies (13,227) (9,863) (9,695)
Raw materials and supplies for generation  (123,279) (1,878,815) (415,405)
Natural gas and supplies for gas business
Third party services (207,239) (203,823) (118,562)
Depreciation and amortization 783,828 (616,267) (583,958)
Provision (reversal) for litigations (17,503) (25,238) (53,216)
Impairment of assets (82,758) 150,697 48,111
Other estimated losses, provisions and reversals (992) (1,041) (5,872)
Construction cost
Provision for allocation of PIS and Cofins credits    
Other operating costs and expenses, net (294,933) (168,571) (143,140)
EQUITY IN EARNINGS OF INVESTEES 20,370 16,596 9,629
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX  1,354,062 2,889,603 1,692,199
Financial income 210,356 128,461 121,129
Financial expenses 669,382 (506,541) (408,795)
 PIS and Cofins credits    
OPERATING PROFIT (LOSS) 895,036 2,511,523 1,404,533
Income tax and social contribution (241,816) 675,107 (337,564)
NET INCOME (LOSS) 653,220 1,836,416 1,066,969
Hydrological risk renegotiation (GSF)   1,570,543  
NET INCOME (LOSS) - CONTINUING OPERATIONS   1,836,416 1,066,969
Result of discontinued operations  
Electricity Get Tra [Member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES 1,140,734 1,541,080 1,186,215
Net operating revenues - third-parties 781,448 1,181,374 875,240
Net operating revenues - between segments 359,286 359,706 310,975
OPERATING COSTS AND EXPENSES (303,450) (457,137) (536,968)
Energy purchased for resale
Charges for use of the main transmission grid
Personnel and management (123,528) (167,041) (168,828)
Pension and healthcare plans (30,948) (27,954) (23,972)
Materials and supplies (5,297) (4,161) (3,466)
Raw materials and supplies for generation 
Natural gas and supplies for gas business
Third party services (37,041) (30,699) (24,863)
Depreciation and amortization 13,692 (11,431) (11,812)
Provision (reversal) for litigations (951) (9,151) (24,529)
Impairment of assets (155)
Other estimated losses, provisions and reversals 3,065 (3,498) (4,149)
Construction cost (89,166) (187,733) (255,578)
Provision for allocation of PIS and Cofins credits    
Other operating costs and expenses, net (5,892) (15,314) (19,771)
EQUITY IN EARNINGS OF INVESTEES 450,235 339,774 176,848
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX  1,287,519 1,423,717 826,095
Financial income 58,514 19,542 21,977
Financial expenses 272,287 (160,961) (97,417)
 PIS and Cofins credits    
OPERATING PROFIT (LOSS) 1,073,746 1,282,298 750,655
Income tax and social contribution (56,354) 262,395 (149,962)
NET INCOME (LOSS) 1,017,392 1,019,903 600,693
Hydrological risk renegotiation (GSF)    
NET INCOME (LOSS) - CONTINUING OPERATIONS   1,019,903 600,693
Result of discontinued operations  
Electricity Dis [Member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES 13,903,300 14,836,392 12,363,459
Net operating revenues - third-parties 13,866,122 14,785,432 12,312,047
Net operating revenues - between segments 37,178 50,960 51,412
OPERATING COSTS AND EXPENSES (13,418,798) (13,669,382) (10,674,981)
Energy purchased for resale (5,980,124) (7,277,499) (5,856,372)
Charges for use of the main transmission grid (2,313,203) (2,363,451) (1,370,814)
Personnel and management (599,121) (905,338) (994,037)
Pension and healthcare plans (169,493) (155,774) (146,422)
Materials and supplies (71,302) (51,722) (58,196)
Raw materials and supplies for generation 
Natural gas and supplies for gas business
Third party services (505,407) (450,752) (405,854)
Depreciation and amortization 454,307 (406,632) (374,851)
Provision (reversal) for litigations (162,414) (89,662) (55,118)
Impairment of assets
Other estimated losses, provisions and reversals (119,481) (127,334) (88,159)
Construction cost (2,048,022) (1,700,889) (1,154,488)
Provision for allocation of PIS and Cofins credits (810,563)    
Other operating costs and expenses, net (185,361) (140,329) (170,670)
EQUITY IN EARNINGS OF INVESTEES
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX  484,502 1,167,010 1,688,478
Financial income 593,726 457,697 1,334,983
Financial expenses 752,097 (391,228) (291,002)
 PIS and Cofins credits (1,011,370)    
OPERATING PROFIT (LOSS) (685,239) 1,233,479 2,732,459
Income tax and social contribution 455,465 375,597 (878,278)
NET INCOME (LOSS) (229,774) 857,882 1,854,181
Hydrological risk renegotiation (GSF)    
NET INCOME (LOSS) - CONTINUING OPERATIONS   857,882 1,854,181
Result of discontinued operations  
Com [Member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES 4,938,368 4,536,414 2,420,657
Net operating revenues - third-parties 4,608,702 3,395,592 2,323,825
Net operating revenues - between segments 329,666 1,140,822 96,832
OPERATING COSTS AND EXPENSES (4,814,710) (4,478,439) (2,262,053)
Energy purchased for resale (4,790,427) (4,450,586) (2,239,388)
Charges for use of the main transmission grid
Personnel and management (12,712) (18,568) (15,007)
Pension and healthcare plans (1,787) (1,547) (1,493)
Materials and supplies (53) (17) (28)
Raw materials and supplies for generation 
Natural gas and supplies for gas business
Third party services (2,665) (2,925) (1,493)
Depreciation and amortization 353 (234) (75)
Provision (reversal) for litigations 31 (295) (62)
Impairment of assets
Other estimated losses, provisions and reversals (1,755) (511) (839)
Construction cost
Provision for allocation of PIS and Cofins credits    
Other operating costs and expenses, net (4,989) (3,756) (3,668)
EQUITY IN EARNINGS OF INVESTEES (93)
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX  123,658 57,975 158,511
Financial income 32,667 14,151 11,469
Financial expenses 291 (211) (96)
 PIS and Cofins credits    
OPERATING PROFIT (LOSS) 156,034 71,915 169,884
Income tax and social contribution (47,659) 18,190 (57,947)
NET INCOME (LOSS) 108,375 53,725 111,937
Hydrological risk renegotiation (GSF)    
NET INCOME (LOSS) - CONTINUING OPERATIONS   53,725 111,937
Result of discontinued operations  
Gas [Member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES 1,297,034 783,277 535,206
Net operating revenues - third-parties 1,293,872 757,494 522,328
Net operating revenues - between segments 3,162 25,783 12,878
OPERATING COSTS AND EXPENSES (1,076,181) (654,643) (452,495)
Energy purchased for resale
Charges for use of the main transmission grid
Personnel and management (42,166) (39,121) (35,998)
Pension and healthcare plans (5,366) (5,154) (4,663)
Materials and supplies (1,644) (3,590) (580)
Raw materials and supplies for generation 
Natural gas and supplies for gas business (939,516) (506,065) (354,701)
Third party services (13,316) (13,850) (11,633)
Depreciation and amortization 44,190 (41,178) (31,452)
Provision (reversal) for litigations (24) (15,510) (85)
Impairment of assets (1,629) (15,688)
Other estimated losses, provisions and reversals (1,064) 2,611 (238)
Construction cost (12,024) (11,222) (7,438)
Provision for allocation of PIS and Cofins credits    
Other operating costs and expenses, net (15,242) (5,876) (5,707)
EQUITY IN EARNINGS OF INVESTEES
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX  220,853 128,634 82,711
Financial income 56,730 19,422 13,599
Financial expenses 28,290 (9,605) (14,363)
 PIS and Cofins credits    
OPERATING PROFIT (LOSS) 249,293 138,451 81,947
Income tax and social contribution (70,092) 38,860 (22,967)
NET INCOME (LOSS) 179,201 99,591 58,980
Hydrological risk renegotiation (GSF)    
NET INCOME (LOSS) - CONTINUING OPERATIONS   99,591 58,980
Result of discontinued operations  
Holding And Services [Member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES 8,014 40,478  
Net operating revenues - third-parties 8,014 40,478  
Net operating revenues - between segments  
OPERATING COSTS AND EXPENSES (570,344) (246,871)  
Energy purchased for resale  
Charges for use of the main transmission grid  
Personnel and management (41,651) (99,926)  
Pension and healthcare plans (9,614) (7,889)  
Materials and supplies (924) (471)  
Raw materials and supplies for generation   
Natural gas and supplies for gas business  
Third party services (41,702) (26,147)  
Depreciation and amortization 4,612 (3,515)  
Provision (reversal) for litigations (445,741) (50,215)  
Impairment of assets  
Other estimated losses, provisions and reversals (28,662)  
Construction cost  
Provision for allocation of PIS and Cofins credits    
Other operating costs and expenses, net (26,100) (30,046)  
EQUITY IN EARNINGS OF INVESTEES 7,972 9,944  
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX  (554,358) (196,449)  
Financial income 87,621 313,617  
Financial expenses 271,934 (211,708)  
 PIS and Cofins credits    
OPERATING PROFIT (LOSS) (738,671) (94,540)  
Income tax and social contribution 159,578 (93,879)  
NET INCOME (LOSS) (579,093) 1,115,718  
Hydrological risk renegotiation (GSF)    
NET INCOME (LOSS) - CONTINUING OPERATIONS   (661)  
Result of discontinued operations   1,116,379  
Elimination of intersegment amounts [member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES (3,459,469) (3,954,054) (1,934,058)
Net operating revenues - third-parties
Net operating revenues - between segments (3,459,469) (3,954,054) (1,934,058)
OPERATING COSTS AND EXPENSES 3,459,469 4,055,448 1,968,329
Energy purchased for resale 3,059,851 3,504,199 1,526,880
Charges for use of the main transmission grid 392,098 386,372 335,168
Personnel and management
Pension and healthcare plans
Materials and supplies 2
Raw materials and supplies for generation  2,870 23,867 10,909
Natural gas and supplies for gas business
Third party services 6,627 21,597 36,389
Depreciation and amortization 72,726 34,273
Provision (reversal) for litigations
Impairment of assets
Other estimated losses, provisions and reversals 28,662
Construction cost
Provision for allocation of PIS and Cofins credits    
Other operating costs and expenses, net (1,977) 18,023 24,710
EQUITY IN EARNINGS OF INVESTEES
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX  101,394 34,271
Financial income (6,777) (20,844) (3,922)
Financial expenses (6,777) 20,844 3,923
 PIS and Cofins credits    
OPERATING PROFIT (LOSS) 101,394 34,272
Income tax and social contribution 24,726 (9,405)
NET INCOME (LOSS) 76,668 24,867
Hydrological risk renegotiation (GSF)    
NET INCOME (LOSS) - CONTINUING OPERATIONS   76,668 24,867
Result of discontinued operations  
Total [Member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES 21,927,721 23,984,287 18,633,249
Net operating revenues - third-parties 21,927,721 23,984,287 18,633,249
Net operating revenues - between segments
OPERATING COSTS AND EXPENSES (19,490,062) (18,904,563) (14,573,530)
Energy purchased for resale (8,096,910) (9,503,743) (6,829,530)
Charges for use of the main transmission grid (2,520,527) (2,501,641) (1,525,567)
Personnel and management (1,026,862) (1,550,857) (1,601,895)
Pension and healthcare plans (266,181) (248,773) (228,634)
Materials and supplies (92,447) (69,822) (72,680)
Raw materials and supplies for generation  (120,409) (1,854,948) (404,496)
Natural gas and supplies for gas business (939,516) (506,065) (354,701)
Third party services (800,743) (706,599) (558,041)
Depreciation and amortization 1,300,982 (1,082,539) (1,009,913)
Provision (reversal) for litigations (626,602) (190,071) (150,269)
Impairment of assets (84,387) 134,854 48,111
Other estimated losses, provisions and reversals (120,227) (129,773) (99,257)
Construction cost (2,149,212) (1,899,844) (1,417,504)
Provision for allocation of PIS and Cofins credits (810,563)    
Other operating costs and expenses, net (534,494) (365,285) (369,154)
EQUITY IN EARNINGS OF INVESTEES 478,577 366,314 193,547
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX  2,916,236 5,446,038 4,253,266
Financial income 1,032,837 932,049 1,839,668
Financial expenses 1,987,504 (1,259,410) (973,397)
 PIS and Cofins credits (1,011,370)    
OPERATING PROFIT (LOSS) 950,199 5,118,677 5,119,537
Income tax and social contribution 199,122 1,259,632 (1,285,365)
NET INCOME (LOSS) R$ 1,149,321 5,048,602 3,909,750
Hydrological risk renegotiation (GSF)   1,570,543  
NET INCOME (LOSS) - CONTINUING OPERATIONS   3,859,045 3,834,172
Result of discontinued operations   1,189,557 75,578
Tel [Member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES   243,611 386,634
Net operating revenues - third-parties   228,379 355,845
Net operating revenues - between segments   15,232 30,789
OPERATING COSTS AND EXPENSES   (222,883) (363,673)
Energy purchased for resale  
Charges for use of the main transmission grid  
Personnel and management   (39,365) (82,817)
Pension and healthcare plans   (6,289) (11,207)
Materials and supplies   (965) (1,364)
Raw materials and supplies for generation   
Natural gas and supplies for gas business  
Third party services   (38,690) (66,426)
Depreciation and amortization   (77,901) (147,190)
Provision (reversal) for litigations   4,845 336
Impairment of assets   5,156 54,945
Other estimated losses, provisions and reversals   (8,612) (18,088)
Construction cost  
Other operating costs and expenses, net   (61,062) (91,862)
EQUITY IN EARNINGS OF INVESTEES  
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX    20,728 22,961
Financial income   19,183 24,968
Financial expenses   (44,928) (58,317)
OPERATING PROFIT (LOSS)   (5,017) (10,388)
Income tax and social contribution   6,284 2,357
NET INCOME (LOSS)   (11,301) (8,031)
Hydrological risk renegotiation (GSF)    
NET INCOME (LOSS) - CONTINUING OPERATIONS   (11,301) (8,031)
Result of discontinued operations  
Reclassifications Note 41 [Member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES   (228,379) (355,843)
Net operating revenues - third-parties   (228,379) (355,843)
Net operating revenues - between segments  
OPERATING COSTS AND EXPENSES   81,805 203,779
Energy purchased for resale  
Charges for use of the main transmission grid  
Personnel and management  
Pension and healthcare plans  
Materials and supplies   965 1,364
Raw materials and supplies for generation   
Natural gas and supplies for gas business  
Third party services   38,690 66,426
Depreciation and amortization   1,893 107,497
Provision (reversal) for litigations   (4,845) (336)
Impairment of assets   (5,156) (54,945)
Other estimated losses, provisions and reversals   8,612 18,088
Construction cost  
Other operating costs and expenses, net   41,646 65,685
EQUITY IN EARNINGS OF INVESTEES  
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX    (146,574) (152,064)
Financial income   (19,180) (24,939)
Financial expenses   44,928 58,317
OPERATING PROFIT (LOSS)   (120,826) (118,686)
Income tax and social contribution   (47,648) 43,108
NET INCOME (LOSS)  
Hydrological risk renegotiation (GSF)    
NET INCOME (LOSS) - CONTINUING OPERATIONS   (73,178) (75,578)
Result of discontinued operations   R$ 73,178 75,578
Hol [Member]      
IfrsStatementLineItems [Line Items]      
NET OPERATING REVENUES    
Net operating revenues - third-parties    
Net operating revenues - between segments    
OPERATING COSTS AND EXPENSES     (107,059)
Energy purchased for resale    
Charges for use of the main transmission grid    
Personnel and management     (27,303)
Pension and healthcare plans     (2,681)
Materials and supplies     (715)
Raw materials and supplies for generation     
Natural gas and supplies for gas business    
Third party services     (32,025)
Depreciation and amortization     (2,345)
Provision (reversal) for litigations     (17,259)
Impairment of assets    
Other estimated losses, provisions and reversals    
Construction cost    
Other operating costs and expenses, net     (24,731)
EQUITY IN EARNINGS OF INVESTEES     7,163
PROFIT (LOSS) BEFORE FINANCIAL      
 INCOME AND TAX      (99,896)
Financial income     340,404
Financial expenses     (165,647)
OPERATING PROFIT (LOSS)     74,861
Income tax and social contribution     125,293
NET INCOME (LOSS)     200,154
NET INCOME (LOSS) - CONTINUING OPERATIONS     200,154
Result of discontinued operations