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Operating Segments - Schedule of Operating Revenues, Costs and Expenses (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
REVENUE R$ 36,850 R$ 34,463 R$ 33,646
COSTS AND EXPENSES      
Post-employment obligations (535) (482) (422)
Materials, outsourced services and others expenses (revenues) 140 148 94
Construction costs (4,072) (3,536) (2,036)
COSTS AND EXPENSES (6,167) (6,069) (4,752)
Finance net income (expenses) 1,272 1,500 844
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 6,851 4,120 4,699
Income tax and social contribution tax 1,084 26 946
NET INCOME FOR THE YEAR 5,767 4,094 3,753
Non-controlling interests 3 2 2
Operating Segments [Member] | Generation Segment [Member]      
IfrsStatementLineItems [Line Items]      
REVENUE 2,875 2,661 2,921
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (347) (331) (795)
COSTS AND EXPENSES      
Personnel (148) (162) (149)
Employees and managers' income sharing (16) (15) (14)
Post-employment obligations (59) (66) (5)
Materials, outsourced services and others expenses (revenues) (223) (395) (209)
Depreciation and amortization (327) (328) (254)
Operating provisions and impairment (29) (18) (20)
Total cost of operation (802) (984) (651)
COSTS AND EXPENSES (1,149) (1,315) (1,446)
Renegotiation of hydrological risk (Law 14,052/20), net     1,032
Equity in earnings of unconsolidated investees, net (2) (2)  
Equity in earnings of unconsolidated investees, net     54
INCOME BEFORE FINANCE INCOME (EXPENSES) 1,724 1,344 2,561
Finance net income (expenses) (11) (150) (758)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 1,713 1,194 1,803
Income tax and social contribution tax (326) (307) (409)
NET INCOME FOR THE YEAR 1,387 887 1,394
Equity holders of the parent 1,387 887 1,394
Operating Segments [Member] | Transmission Segment [Member]      
IfrsStatementLineItems [Line Items]      
REVENUE 1,091 1,195 1,094
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID    
COSTS AND EXPENSES      
Personnel (137) (135) (115)
Employees and managers' income sharing (16) (11) (14)
Post-employment obligations (36) (42) 3
Materials, outsourced services and others expenses (revenues) (88) (96) (94)
Depreciation and amortization (1)   (3)
Operating provisions and impairment (14) (3) (12)
Construction costs (172) (291) (184)
Total cost of operation (464) (578) (419)
COSTS AND EXPENSES (464) (578) (419)
Periodic Tariff Revision, net     215
Equity in earnings of unconsolidated investees, net   3  
Result of business combination     4
INCOME BEFORE FINANCE INCOME (EXPENSES) 627 620 894
Finance net income (expenses) (48) (96) (395)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 579 524 499
Income tax and social contribution tax (114) (174) (78)
NET INCOME FOR THE YEAR 465 350 421
Equity holders of the parent 465 350 421
Operating Segments [Member] | Tranding Segment [Member]      
IfrsStatementLineItems [Line Items]      
REVENUE 7,686 7,918 6,430
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (6,318) (6,880) (5,735)
COSTS AND EXPENSES      
Personnel (27) (12) (20)
Employees and managers' income sharing (3) (6) (3)
Post-employment obligations (8) (10) (1)
Materials, outsourced services and others expenses (revenues) (18) (14) (14)
Depreciation and amortization   (1)
Operating provisions and impairment (7) (34) (14)
Construction costs    
Total cost of operation (63) (76) (53)
COSTS AND EXPENSES (6,381) (6,956) (5,788)
INCOME BEFORE FINANCE INCOME (EXPENSES) 1,305 962 642
Finance net income (expenses) 82 34 15
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 1,387 996 657
Income tax and social contribution tax (428) (314) (224)
NET INCOME FOR THE YEAR 959 682 433
Equity holders of the parent 959 682 433
Operating Segments [Member] | Distribution Segment [Member]      
IfrsStatementLineItems [Line Items]      
REVENUE 23,348 20,919 22,345
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (12,656) (11,938) (14,853)
COSTS AND EXPENSES      
Personnel (875) (913) (847)
Employees and managers' income sharing (102) (40) (94)
Post-employment obligations (400) (421) 19
Materials, outsourced services and others expenses (revenues) (2,157) (1,786) (1,524)
Depreciation and amortization (834) (738) (683)
Operating provisions and impairment (455) (398) (198)
Construction costs (3,600) (3,193) (1,802)
Total cost of operation (8,423) (7,489) (5,129)
COSTS AND EXPENSES (21,079) (19,427) (19,982)
INCOME BEFORE FINANCE INCOME (EXPENSES) 2,269 1,492 2,363
Finance net income (expenses) (253) (1,115) (7)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 2,016 377 2,356
Income tax and social contribution tax (405) 67 (655)
NET INCOME FOR THE YEAR 1,611 444 1,701
Equity holders of the parent 1,611 444 1,701
Operating Segments [Member] | Gas [Member]      
IfrsStatementLineItems [Line Items]      
REVENUE 3,618 3,690 2,852
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (2,237) (2,735) (2,011)
COSTS AND EXPENSES      
Personnel (73) (66) (56)
Employees and managers' income sharing    
Post-employment obligations    
Materials, outsourced services and others expenses (revenues) (63) (57) (48)
Depreciation and amortization (94) (91) (90)
Operating provisions and impairment 2   (6)
Construction costs (300) (52) (50)
Total cost of operation (528) (266) (250)
COSTS AND EXPENSES (2,765) (3,001) (2,261)
INCOME BEFORE FINANCE INCOME (EXPENSES) 853 689 591
Finance net income (expenses) (9) (9) (89)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 844 680 502
Income tax and social contribution tax (248) (199) (142)
NET INCOME FOR THE YEAR 596 481 360
Equity holders of the parent 593 479 358
Non-controlling interests 3 2 2
Operating Segments [Member] | Investees Segments [Member]      
IfrsStatementLineItems [Line Items]      
REVENUE 18 7 6
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (4) (1)  
COSTS AND EXPENSES      
Personnel (48) (64) (53)
Employees and managers' income sharing (20) (11) (9)
Post-employment obligations (88) (87) (32)
Materials, outsourced services and others expenses (revenues) 275 (84) (117)
Depreciation and amortization (18) (25) (18)
Operating provisions and impairment (106) (3) (114)
Construction costs    
Total cost of operation (5) (274) (343)
COSTS AND EXPENSES (9) (275) (343)
Equity in earnings of unconsolidated investees, net 434 842  
Equity in earnings of unconsolidated investees, net     128
Gains arising from the sale of non-current asset held for sale 9   109
Result of business combination   5  
INCOME BEFORE FINANCE INCOME (EXPENSES) 452 579 (100)
Finance net income (expenses) (140) (230) (1,018)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 312 349 (1,118)
Income tax and social contribution tax 437 901 562
NET INCOME FOR THE YEAR 749 1,250 (556)
Equity holders of the parent 749 1,250 (556)
Operating Segments [Member] | Total Segments [Member]      
IfrsStatementLineItems [Line Items]      
REVENUE 38,636 36,390 35,648
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (21,562) (21,885) (23,394)
COSTS AND EXPENSES      
Personnel (1,308) (1,352) (1,240)
Employees and managers' income sharing (157) (83) (134)
Post-employment obligations (591) (626) (16)
Materials, outsourced services and others expenses (revenues) (2,274) (2,432) (2,006)
Depreciation and amortization (1,274) (1,182) (1,049)
Operating provisions and impairment (609) (456) (364)
Construction costs (4,072) (3,536) (2,036)
Total cost of operation (10,285) (9,667) (6,845)
COSTS AND EXPENSES (31,847) (31,552) (30,239)
Periodic Tariff Revision, net     215
Renegotiation of hydrological risk (Law 14,052/20), net     1,032
Equity in earnings of unconsolidated investees, net 432 843  
Equity in earnings of unconsolidated investees, net     182
Gains arising from the sale of non-current asset held for sale 9   109
Result of business combination   5 4
INCOME BEFORE FINANCE INCOME (EXPENSES) 7,230 5,686 6,951
Finance net income (expenses) (379) (1,566) (2,252)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 6,851 4,120 4,699
Income tax and social contribution tax (1,084) (26) (946)
NET INCOME FOR THE YEAR 5,767 4,094 3,753
Equity holders of the parent 5,764 4,092 3,751
Non-controlling interests 3 2 2
Operating Segments [Member] | Intersegment Transactions Segments [Member]      
IfrsStatementLineItems [Line Items]      
REVENUE (1,208) (1,423) (1,575)
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID 1,208 1,423 1,575
COSTS AND EXPENSES      
Personnel    
Employees and managers' income sharing    
Post-employment obligations    
Materials, outsourced services and others expenses (revenues)    
Depreciation and amortization    
Operating provisions and impairment    
Construction costs    
Total cost of operation    
COSTS AND EXPENSES 1,208 1,423 1,575
Operating Segments [Member] | Reconciliation Segments [Member]      
IfrsStatementLineItems [Line Items]      
REVENUE (578) (504) (427)
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID 532 442 370
COSTS AND EXPENSES      
Personnel    
Employees and managers' income sharing    
Post-employment obligations    
Materials, outsourced services and others expenses (revenues) 46 62 57
Depreciation and amortization    
Operating provisions and impairment    
Construction costs    
Total cost of operation 46 62 57
COSTS AND EXPENSES 578 504 427
Operating Segments [Member] | All Other Segments [Member]      
IfrsStatementLineItems [Line Items]      
REVENUE 36,850 34,463 33,646
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (19,822) (20,020) (21,449)
COSTS AND EXPENSES      
Personnel (1,308) (1,352) (1,240)
Employees and managers' income sharing (157) (83) (134)
Post-employment obligations (591) (626) (16)
Materials, outsourced services and others expenses (revenues) (2,228) (2,370) (1,949)
Depreciation and amortization (1,274) (1,182) (1,049)
Operating provisions and impairment (609) (456) (364)
Construction costs (4,072) (3,536) (2,036)
Total cost of operation (10,239) (9,605) (6,788)
COSTS AND EXPENSES (30,061) (29,625) (28,237)
Periodic Tariff Revision, net     215
Renegotiation of hydrological risk (Law 14,052/20), net     1,032
Equity in earnings of unconsolidated investees, net 432 843  
Equity in earnings of unconsolidated investees, net     182
Gains arising from the sale of non-current asset held for sale 9   109
Result of business combination   5 4
INCOME BEFORE FINANCE INCOME (EXPENSES) 7,230 5,686 6,951
Finance net income (expenses) (379) (1,566) (2,252)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 6,851 4,120 4,699
Income tax and social contribution tax (1,084) (26) (946)
NET INCOME FOR THE YEAR 5,767 4,094 3,753
Equity holders of the parent 5,764 4,092 3,751
Non-controlling interests R$ 3 R$ 2 R$ 2