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Operating Segments (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of disaggregation of revenue from contracts with customers [line items]      
OPERATING COSTS AND EXPENSES R$ (18,867,990) R$ (18,092,563) R$ (17,254,583)
Financial income 1,184,779 1,069,116 956,413
Income tax and social contribution (599,435) (354,057) 281,099
NET INCOME 2,799,370 2,327,168 1,149,321
Elimination of intersegment amounts [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
NET OPERATING REVENUES (2,577,379) (2,940,384) (3,459,469)
Revenue from sale of goods, related party transactions 0 0 0
Net operating revenue - between segments (2,577,379) (2,940,384) (3,459,469)
OPERATING COSTS AND EXPENSES 2,577,373 2,940,384 3,459,469
Energy purchased for resale 2,104,284 2,492,703 3,059,851
Charges for use of the main transmission grid 471,664 442,919 392,098
Personnel and management 0 0 0
Pension and healthcare plans 0 0 0
Materials and supplies 0 0 0
Raw materials and supplies for generation  772 1,301 2,870
Natural gas and supplies for gas business 0 0 0
Third party services 2,926 3,337 6,627
Depreciation and amortization 0 0 0
Provision (reversal) for litigations (6) 0 0
Impairment of assets 0 0 0
Other estimated losses, provisions and reversals 0 0 0
Construction cost 0 0 0
Hydrological risk renegotiation (GSF)    
Other operating costs and expenses, net (2,267) 124 (1,977)
Share of profit (loss) of associates and joint ventures accounted for using equity method 0 0 0
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX (6) 0 0
Financial income (6,967) (23,343) (6,777)
Financial expenses 6,967 23,343 6,777
 PIS and Cofins credits     0
OPERATING PROFIT (LOSS) (6) 0 0
Income tax and social contribution (4,036) 0 0
NET INCOME(LOSS) FROM CONTINUING OPERATIONS 4,030 0 0
Net income from discontinued operations 0 0 0
NET INCOME 4,030 0 0
Total [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
NET OPERATING REVENUES 22,651,036 21,479,468 20,535,341
Revenue from sale of goods, related party transactions 22,651,036 21,479,468 20,535,341
Net operating revenue - between segments 0 0 0
OPERATING COSTS AND EXPENSES (18,867,990) (18,092,563) (18,065,146)
Energy purchased for resale (8,924,895) (7,716,190) (8,096,910)
Charges for use of the main transmission grid (2,865,490) (2,896,710) (2,487,997)
Personnel and management (1,081,797) (1,878,332) (977,904)
Pension and healthcare plans (259,352) (260,159) (260,197)
Materials and supplies (86,882) (102,667) (90,541)
Raw materials and supplies for generation  (936) (17,654) (9,349)
Natural gas and supplies for gas business 0 0 0
Third party services (1,074,308) (996,312) (754,551)
Depreciation and amortization (1,465,478) (1,382,040) (1,233,097)
Provision (reversal) for litigations (222,251) (157,668) (623,742)
Impairment of assets (24,165) (177,693) (25,374)
Other estimated losses, provisions and reversals (98,686) (112,260) (119,163)
Construction cost (2,522,908) (2,319,720) (2,137,188)
Hydrological risk renegotiation (GSF)     (810,563)
Other operating costs and expenses, net (240,842) (430,544) (489,318)
Share of profit (loss) of associates and joint ventures accounted for using equity method 281,202 307,809 478,577
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX 4,064,248 3,694,714 2,948,772
Financial income 1,184,779 1,069,116 956,413
Financial expenses (2,341,793) (2,274,106) (1,950,927)
 PIS and Cofins credits     1,011,370
OPERATING PROFIT (LOSS) 2,907,234 2,489,724 942,888
Income tax and social contribution (599,435) (354,057) 281,099
NET INCOME(LOSS) FROM CONTINUING OPERATIONS 2,307,799 2,135,667 1,223,987
Net income from discontinued operations 491,571 191,501 (74,666)
NET INCOME 2,799,370 2,327,168  
Electricity Get GER [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
NET OPERATING REVENUES 3,477,696 4,179,457 4,099,740
Revenue from sale of goods, related party transactions 1,473,628 1,764,212 1,369,563
Net operating revenue - between segments 2,004,068 2,415,245 2,730,177
OPERATING COSTS AND EXPENSES (2,348,476) (2,372,792) (2,766,048)
Energy purchased for resale (195,695) (214,198) (386,210)
Charges for use of the main transmission grid (625,586) (658,229) (599,422)
Personnel and management (218,436) (368,744) (207,684)
Pension and healthcare plans (46,764) (49,626) (48,973)
Materials and supplies (15,620) (20,937) (13,227)
Raw materials and supplies for generation  (1,880) (19,113) (123,279)
Natural gas and supplies for gas business 0 0 0
Third party services (249,558) (242,712) (207,239)
Depreciation and amortization (821,258) (843,480) (783,828)
Provision (reversal) for litigations (24,462) (8,204) (17,503)
Impairment of assets 24,165 (285,825) 82,758
Other estimated losses, provisions and reversals (13,172) (7,109) (992)
Construction cost 0 0 0
Hydrological risk renegotiation (GSF)     0
Other operating costs and expenses, net (111,880) (226,265) (294,933)
Share of profit (loss) of associates and joint ventures accounted for using equity method 14,431 16,651 20,370
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX 1,143,651 1,823,316 1,354,062
Financial income 294,113 333,990 210,356
Financial expenses (778,328) (791,547) (669,382)
 PIS and Cofins credits     0
OPERATING PROFIT (LOSS) 659,436 1,365,759 895,036
Income tax and social contribution 197,338 228,373 241,816
NET INCOME(LOSS) FROM CONTINUING OPERATIONS 462,098 1,137,386 653,220
Net income from discontinued operations 12,004 0 0
NET INCOME 474,102 1,137,386 653,220
Electricity Get TRA [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
NET OPERATING REVENUES 1,144,481 1,096,351 1,140,734
Revenue from sale of goods, related party transactions 708,119 687,829 781,448
Net operating revenue - between segments 436,362 408,522 359,286
OPERATING COSTS AND EXPENSES (294,553) (474,506) (303,450)
Energy purchased for resale 0 (14,741) 0
Charges for use of the main transmission grid 0 0 0
Personnel and management (141,042) (247,393) (123,528)
Pension and healthcare plans (32,041) (33,003) (30,948)
Materials and supplies (5,711) (5,583) (5,297)
Raw materials and supplies for generation  0 0 0
Natural gas and supplies for gas business 0 0 0
Third party services (55,001) (50,019) (37,041)
Depreciation and amortization (17,069) (16,207) (13,692)
Provision (reversal) for litigations (9,334) (12,777) (951)
Impairment of assets 0 0 0
Other estimated losses, provisions and reversals (9,007) (2,334) 3,065
Construction cost (95,610) (85,181) (89,166)
Hydrological risk renegotiation (GSF)     0
Other operating costs and expenses, net 70,262 (7,268) (5,892)
Share of profit (loss) of associates and joint ventures accounted for using equity method 262,463 283,939 450,235
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX 1,112,391 905,784 1,287,519
Financial income 90,377 66,922 58,514
Financial expenses (301,485) (344,524) (272,287)
 PIS and Cofins credits     0
OPERATING PROFIT (LOSS) 901,283 628,182 1,073,746
Income tax and social contribution 97,961 (1,779) 56,354
NET INCOME(LOSS) FROM CONTINUING OPERATIONS 803,322 629,961 1,017,392
Net income from discontinued operations 0 0 0
NET INCOME 803,322 629,961 1,017,392
Electricity Energy DIS [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
NET OPERATING REVENUES 17,030,454 15,085,707 13,903,300
Revenue from sale of goods, related party transactions 16,992,784 15,048,581 13,866,122
Net operating revenue - between segments 37,670 37,126 37,178
OPERATING COSTS AND EXPENSES (15,048,163) (13,983,117) (13,418,798)
Energy purchased for resale (7,308,796) (6,074,752) (5,980,124)
Charges for use of the main transmission grid (2,729,154) (2,715,273) (2,313,203)
Personnel and management (636,853) (1,174,906) (599,121)
Pension and healthcare plans (168,977) (167,533) (169,493)
Materials and supplies (63,493) (74,501) (71,302)
Raw materials and supplies for generation  0 0 0
Natural gas and supplies for gas business 0 0 0
Third party services (719,122) (643,999) (505,407)
Depreciation and amortization (592,226) (521,301) (454,307)
Provision (reversal) for litigations (168,067) (101,960) (162,414)
Impairment of assets 0 0 0
Other estimated losses, provisions and reversals (75,402) (99,123) (119,481)
Construction cost (2,427,298) (2,234,539) (2,048,022)
Hydrological risk renegotiation (GSF)     (810,563)
Other operating costs and expenses, net (158,775) (175,230) (185,361)
Share of profit (loss) of associates and joint ventures accounted for using equity method 0 0 0
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX 1,982,291 1,102,590 484,502
Financial income 516,031 479,944 593,726
Financial expenses (1,041,951) (955,046) (752,097)
 PIS and Cofins credits     1,011,370
OPERATING PROFIT (LOSS) 1,456,371 627,488 (685,239)
Income tax and social contribution 322,349 58,368 (455,465)
NET INCOME(LOSS) FROM CONTINUING OPERATIONS 1,134,022 569,120 (229,774)
Net income from discontinued operations 0 0 0
NET INCOME 1,134,022 569,120 (229,774)
Electricity Energy COM [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
NET OPERATING REVENUES 3,568,463 4,056,904 4,938,368
Revenue from sale of goods, related party transactions 3,470,172 3,978,846 4,608,702
Net operating revenue - between segments 98,291 78,058 329,666
OPERATING COSTS AND EXPENSES (3,553,557) (3,948,286) (4,814,710)
Energy purchased for resale (3,524,688) (3,908,484) (4,790,427)
Charges for use of the main transmission grid 0 0 0
Personnel and management (14,462) (21,133) (12,712)
Pension and healthcare plans (1,737) (1,877) (1,787)
Materials and supplies (114) (77) (53)
Raw materials and supplies for generation  0 0 0
Natural gas and supplies for gas business 0 0 0
Third party services (4,603) (3,389) (2,665)
Depreciation and amortization (1,746) (2,003) (353)
Provision (reversal) for litigations 178 (233) 31
Impairment of assets 0 0 0
Other estimated losses, provisions and reversals (958) (3,694) (1,755)
Construction cost 0 0 0
Hydrological risk renegotiation (GSF)     0
Other operating costs and expenses, net (5,427) (7,396) (4,989)
Share of profit (loss) of associates and joint ventures accounted for using equity method 0 0 0
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX 14,906 108,618 123,658
Financial income 40,813 38,577 32,667
Financial expenses (325) (717) (291)
 PIS and Cofins credits     0
OPERATING PROFIT (LOSS) 55,394 146,478 156,034
Income tax and social contribution 11,310 40,928 47,659
NET INCOME(LOSS) FROM CONTINUING OPERATIONS 44,084 105,550 108,375
Net income from discontinued operations 0 0 0
NET INCOME 44,084 105,550 108,375
GAS [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
NET OPERATING REVENUES 562,129 978,581 1,297,034
Revenue from sale of goods, related party transactions 13,618 17,014 1,293,872
Net operating revenue - between segments 548,511 961,567 3,162
OPERATING COSTS AND EXPENSES (503,516) (814,455) (1,076,181)
Energy purchased for resale 0 0 0
Charges for use of the main transmission grid 0 0 0
Personnel and management (33,621) (43,201) (42,166)
Pension and healthcare plans (4,083) (6,222) (5,366)
Materials and supplies (416) (1,574) (1,644)
Raw materials and supplies for generation  0 0 0
Natural gas and supplies for gas business (397,554) (678,885) (939,516)
Third party services (10,650) (13,861) (13,316)
Depreciation and amortization (27,146) (41,148) (44,190)
Provision (reversal) for litigations (32) (263) (24)
Impairment of assets 0 0 1,629
Other estimated losses, provisions and reversals (7,509) (285) (1,064)
Construction cost (13,618) (17,010) (12,024)
Hydrological risk renegotiation (GSF)     0
Other operating costs and expenses, net (8,887) (12,006) (15,242)
Share of profit (loss) of associates and joint ventures accounted for using equity method 0 0 0
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX 58,613 164,126 220,853
Financial income 29,114 36,559 56,730
Financial expenses (39,721) (48,316) (28,290)
 PIS and Cofins credits     0
OPERATING PROFIT (LOSS) 48,006 152,369 249,293
Income tax and social contribution 17,301 40,750 70,092
NET INCOME(LOSS) FROM CONTINUING OPERATIONS 30,705 111,619 179,201
Net income from discontinued operations 0 0 0
NET INCOME 30,705 111,619 179,201
Holding And Services [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
NET OPERATING REVENUES 0   8,014
Revenue from sale of goods, related party transactions 0 0 8,014
Net operating revenue - between segments 0 0 0
OPERATING COSTS AND EXPENSES (192,548)   (570,344)
Energy purchased for resale 0 0 0
Charges for use of the main transmission grid 0 0 0
Personnel and management (73,864) (72,537) (41,651)
Pension and healthcare plans (10,152) (8,853) (9,614)
Materials and supplies (1,946) (1,609) (924)
Raw materials and supplies for generation  0 0 0
Natural gas and supplies for gas business 0 0 0
Third party services (48,483) (68,186) (41,702)
Depreciation and amortization (3,245) (4,700) (4,612)
Provision (reversal) for litigations (20,735) (44,815) (445,741)
Impairment of assets 0 0 0
Other estimated losses, provisions and reversals 0 0 0
Construction cost 0 0 0
Hydrological risk renegotiation (GSF)     0
Other operating costs and expenses, net (34,123) (17,572) (26,100)
Share of profit (loss) of associates and joint ventures accounted for using equity method 4,308 7,219 7,972
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX (188,240)   (554,358)
Financial income 248,195 182,829 87,621
Financial expenses (223,032) (203,206) (271,934)
 PIS and Cofins credits     0
OPERATING PROFIT (LOSS) (163,077)   (738,671)
Income tax and social contribution (18,192) (4,962) (159,578)
NET INCOME(LOSS) FROM CONTINUING OPERATIONS (144,885)   (579,093)
Net income from discontinued operations 458,342   0
NET INCOME 313,457   (579,093)
Reclassifications [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
NET OPERATING REVENUES (561,141) (977,148) (1,392,380)
Revenue from sale of goods, related party transactions (13,618) (17,014) (1,392,380)
Net operating revenue - between segments (547,523) (960,134) 0
OPERATING COSTS AND EXPENSES 502,579 778,481 1,424,916
Energy purchased for resale 0 3,282 0
Charges for use of the main transmission grid 17,586 33,873 32,530
Personnel and management 36,745 49,582 48,958
Pension and healthcare plans 4,447 6,955 5,984
Materials and supplies 434 1,614 1,906
Raw materials and supplies for generation  172 158 111,060
Natural gas and supplies for gas business 397,554 678,885 939,516
Third party services 14,134 22,517 46,192
Depreciation and amortization 0 46,799 67,885
Provision (reversal) for litigations 207 10,584 2,860
Impairment of assets 0 108,132 (109,761)
Other estimated losses, provisions and reversals 7,509 285 1,064
Construction cost 13,618 17,010 12,024
Hydrological risk renegotiation (GSF)     0
Other operating costs and expenses, net 10,173 15,069 45,176
Share of profit (loss) of associates and joint ventures accounted for using equity method 0 0 0
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX (58,562) (198,667) 32,536
Financial income (30,182) (46,362) (76,424)
Financial expenses 40,988 45,907 36,577
 PIS and Cofins credits     0
OPERATING PROFIT (LOSS) (47,756) (199,122) (7,311)
Income tax and social contribution (26,531) (7,621) (81,977)
NET INCOME(LOSS) FROM CONTINUING OPERATIONS (21,225) (191,501) 74,666
Net income from discontinued operations 21,225 191,501 (74,666)
NET INCOME 0 0 R$ 0
SER [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
NET OPERATING REVENUES 6,333 0  
Revenue from sale of goods, related party transactions 6,333    
Net operating revenue - between segments 0    
OPERATING COSTS AND EXPENSES (7,129) (218,272)  
Energy purchased for resale 0    
Charges for use of the main transmission grid 0    
Personnel and management (264)    
Pension and healthcare plans (45)    
Materials and supplies (16)    
Raw materials and supplies for generation  0    
Natural gas and supplies for gas business 0    
Third party services (3,951)    
Depreciation and amortization (2,788)    
Provision (reversal) for litigations 0    
Impairment of assets    
Other estimated losses, provisions and reversals (147)    
Construction cost 0    
Other operating costs and expenses, net 82    
Share of profit (loss) of associates and joint ventures accounted for using equity method 0    
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX (796) (211,053)  
Financial income 3,285    
Financial expenses (4,906)    
OPERATING PROFIT (LOSS) (2,417) (231,430)  
Income tax and social contribution 1,935    
NET INCOME(LOSS) FROM CONTINUING OPERATIONS (4,352) (226,468)  
Net income from discontinued operations 0 0  
NET INCOME R$ (4,352) R$ (226,468)