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OPERATING SEGMENTS (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
NET REVENUE R$ 34,463 R$ 33,646 R$ 25,228
OPERATING COSTS AND EXPENSES      
Post-employment obligations 482 422 367
Materials, outsourced services and others expenses (revenues) 149 94  
Construction costs (3,536) (2,036) (1,581)
OPERATING COSTS AND EXPENSES (6,123) (4,752)  
Finance expenses 1,500 844 2,445
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 4,120 4,699 3,801
Income tax and social contribution tax (26) (946)  
NET INCOME FOR THE YEAR 4,094 3,753 2,865
Non-controlling interests 2 2 1
Periodic Tariff Revision, net 215 502
Operating segments [member] | Generation Segment [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 2,661 2,921 2,589
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (331) (795) (528)
OPERATING COSTS AND EXPENSES      
Personnel (162) (149) (170)
‘Employees and managers’ income sharing (15) (14) (16)
Post-employment obligations (66) (5) (42)
Materials, outsourced services and others expenses (revenues) (395) (209) (178)
Depreciation and amortization (328) (254) (205)
Operating provisions and impairment (18) (20) (32)
Construction costs
Total operating costs (984) (651) (643)
OPERATING COSTS AND EXPENSES (1,315) (1,446) (1,171)
Equity in earnings of unconsolidated investees, net (2)   11
Gains arising from the sale of non-current asset held for sale  
Fair value of business combination
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES) 1,344 2,561 1,429
Finance expenses (150) (758) (322)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 1,194 1,803 1,107
Income tax and social contribution tax (307) (409) (308)
NET INCOME FOR THE YEAR 887 1,394 799
Equity holders of the parent 887 1,394 799
Non-controlling interests
Periodic Tariff Revision, net    
Renegotiation of hydrological risk (Law 14,052/20), net   1,032  
Equity in earnings of unconsolidated investees, net   54  
Periodic Tariff Revision, net    
Operating segments [member] | Transmission Segment [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 1,195 1,094 778
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID
OPERATING COSTS AND EXPENSES      
Personnel (135) (115) (102)
‘Employees and managers’ income sharing (11) (14) (14)
Post-employment obligations (42) 3 (38)
Materials, outsourced services and others expenses (revenues) (96) (94) (65)
Depreciation and amortization (3) (5)
Operating provisions and impairment (3) (12) 7
Construction costs (291) (184) (147)
Total operating costs (578) (419) (364)
OPERATING COSTS AND EXPENSES (578) (419) (364)
Equity in earnings of unconsolidated investees, net 3  
Gains arising from the sale of non-current asset held for sale  
Fair value of business combination 4 51
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES) 620 894 967
Finance expenses (96) (395) (152)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 524 499 815
Income tax and social contribution tax (174) (78) (222)
NET INCOME FOR THE YEAR 350 421 593
Equity holders of the parent 350 421 593
Non-controlling interests
Periodic Tariff Revision, net   215  
Renegotiation of hydrological risk (Law 14,052/20), net    
Equity in earnings of unconsolidated investees, net    
Periodic Tariff Revision, net     502
Operating segments [member] | Tranding Segment [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 7,918 6,430 5,382
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (6,880) (5,735) (5,027)
OPERATING COSTS AND EXPENSES      
Personnel (12) (20) (16)
‘Employees and managers’ income sharing (6) (3) (2)
Post-employment obligations (10) (1) (6)
Materials, outsourced services and others expenses (revenues) (14) (14) (11)
Depreciation and amortization (1) (1)
Operating provisions and impairment (34) (14) (1)
Construction costs
Total operating costs (76) (53) (37)
OPERATING COSTS AND EXPENSES (6,956) (5,788) (5,064)
Equity in earnings of unconsolidated investees, net  
Gains arising from the sale of non-current asset held for sale  
Fair value of business combination
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES) 962 642 318
Finance expenses 34 15 21
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 996 657 339
Income tax and social contribution tax (314) (224) (81)
NET INCOME FOR THE YEAR 682 433 258
Equity holders of the parent 682 433 258
Non-controlling interests
Periodic Tariff Revision, net    
Renegotiation of hydrological risk (Law 14,052/20), net    
Equity in earnings of unconsolidated investees, net    
Periodic Tariff Revision, net    
Operating segments [member] | Distribution Segment [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 20,919 22,345 16,512
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (11,938) (14,853) (9,960)
OPERATING COSTS AND EXPENSES      
Personnel (913) (847) (886)
‘Employees and managers’ income sharing (40) (94) (93)
Post-employment obligations (421) 19 (297)
Materials, outsourced services and others expenses (revenues) (1,785) (1,524) (1,327)
Depreciation and amortization (738) (683) (668)
Operating provisions and impairment (398) (198) (274)
Construction costs (3,193) (1,802) (1,384)
Total operating costs (7,488) (5,129) (4,929)
OPERATING COSTS AND EXPENSES (19,426) (19,982) (14,889)
Equity in earnings of unconsolidated investees, net  
Gains arising from the sale of non-current asset held for sale  
Fair value of business combination
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES) 1,493 2,363 1,623
Finance expenses (1,115) (7) 22
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 378 2,356 1,645
Income tax and social contribution tax 67 (655) (430)
NET INCOME FOR THE YEAR 445 1,701 1,215
Equity holders of the parent 445 1,701 1,215
Non-controlling interests
Periodic Tariff Revision, net    
Renegotiation of hydrological risk (Law 14,052/20), net    
Equity in earnings of unconsolidated investees, net    
Periodic Tariff Revision, net    
Operating segments [member] | Investees Segments [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 3,697 2,858 1,673
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (2,736) (2,011) (1,083)
OPERATING COSTS AND EXPENSES      
Personnel (130) (109) (102)
‘Employees and managers’ income sharing (11) (9) (17)
Post-employment obligations (87) (32) (55)
Materials, outsourced services and others expenses (revenues) (203) (165) (110)
Depreciation and amortization (109) (108) (110)
Operating provisions and impairment (3) (120) (123)
Construction costs (52) (50) (50)
Total operating costs (595) (593) (567)
OPERATING COSTS AND EXPENSES (3,331) (2,604) (1,650)
Equity in earnings of unconsolidated investees, net 844   346
Gains arising from the sale of non-current asset held for sale 52 109  
Fair value of business combination 5
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES) 1,267 491 369
Finance expenses (239) (1,107) (474)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 1,028 (616) (105)
Income tax and social contribution tax 702 420 105
NET INCOME FOR THE YEAR 1,730 (196)
Equity holders of the parent 1,728 (198) (1)
Non-controlling interests 2 2 1
Periodic Tariff Revision, net    
Renegotiation of hydrological risk (Law 14,052/20), net    
Equity in earnings of unconsolidated investees, net   128  
Periodic Tariff Revision, net    
Operating segments [member] | Total Segments [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 36,390 35,648 26,934
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (21,885) (23,394) (16,598)
OPERATING COSTS AND EXPENSES      
Personnel (1,352) (1,240) (1,276)
‘Employees and managers’ income sharing (83) (134) (142)
Post-employment obligations (626) (16) (438)
Materials, outsourced services and others expenses (revenues) (2,481) (2,006) (1,691)
Depreciation and amortization (1,182) (1,049) (989)
Operating provisions and impairment (456) (364) (423)
Construction costs (3,536) (2,036) (1,581)
Total operating costs (9,716) (6,845) (6,540)
OPERATING COSTS AND EXPENSES (31,601) (30,239) (23,138)
Equity in earnings of unconsolidated investees, net 845   357
Gains arising from the sale of non-current asset held for sale 52 109  
Fair value of business combination 5 4 51
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES) 5,686 6,951 4,706
Finance expenses (1,566) (2,252) (905)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 4,120 4,699 3,801
Income tax and social contribution tax (26) (946) (936)
NET INCOME FOR THE YEAR 4,094 3,753 2,865
Equity holders of the parent 4,092 3,751 2,864
Non-controlling interests 2 2 1
Periodic Tariff Revision, net   215  
Renegotiation of hydrological risk (Law 14,052/20), net   1,032  
Equity in earnings of unconsolidated investees, net   182  
Periodic Tariff Revision, net     502
Operating segments [member] | Intersegment Transactions Segments [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE (1,423) (1,575) (1,324)
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID 1,423 1,575 1,324
OPERATING 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 operating costs
OPERATING COSTS AND EXPENSES 1,423 1,575 1,324
Equity in earnings of unconsolidated investees, net  
Gains arising from the sale of non-current asset held for sale  
Fair value of business combination
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES)
Finance expenses
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX
Income tax and social contribution tax
NET INCOME FOR THE YEAR
Equity holders of the parent
Non-controlling interests
Periodic Tariff Revision, net    
Renegotiation of hydrological risk (Law 14,052/20), net    
Equity in earnings of unconsolidated investees, net    
Periodic Tariff Revision, net    
Operating segments [member] | Reconciliation Segments [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE (504) (427) (382)
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID 442 370 332
OPERATING COSTS AND EXPENSES      
Personnel
‘Employees and managers’ income sharing
Post-employment obligations
Materials, outsourced services and others expenses (revenues) 62 57 50
Depreciation and amortization
Operating provisions and impairment
Construction costs
Total operating costs 62 57 50
OPERATING COSTS AND EXPENSES 504 427 382
Equity in earnings of unconsolidated investees, net  
Gains arising from the sale of non-current asset held for sale  
Fair value of business combination
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES)
Finance expenses
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX
Income tax and social contribution tax
NET INCOME FOR THE YEAR
Equity holders of the parent
Non-controlling interests
Periodic Tariff Revision, net    
Renegotiation of hydrological risk (Law 14,052/20), net    
Equity in earnings of unconsolidated investees, net    
Periodic Tariff Revision, net    
Operating segments [member] | All other segments [member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 34,463 33,646 25,228
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (20,020) (21,449) (14,942)
OPERATING COSTS AND EXPENSES      
Personnel (1,352) (1,240) (1,276)
‘Employees and managers’ income sharing (83) (134) (142)
Post-employment obligations (626) (16) (438)
Materials, outsourced services and others expenses (revenues) (2,419) (1,949) (1,641)
Depreciation and amortization (1,182) (1,049) (989)
Operating provisions and impairment (456) (364) (423)
Construction costs (3,536) (2,036) (1,581)
Total operating costs (9,655) (6,788) (6,490)
OPERATING COSTS AND EXPENSES (29,675) (28,237) (21,432)
Equity in earnings of unconsolidated investees, net 845   357
Gains arising from the sale of non-current asset held for sale 52 109  
Fair value of business combination 5 4 51
OPERATING INCOME BEFORE FINANCE INCOME (EXPENSES) 5,686 6,951 4,706
Finance expenses (1,566) (2,252) (905)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 4,120 4,699 3,801
Income tax and social contribution tax (26) (946) (936)
NET INCOME FOR THE YEAR 4,094 3,753 2,865
Equity holders of the parent 4,092 3,751 2,864
Non-controlling interests R$ 2 2 1
Periodic Tariff Revision, net   215  
Renegotiation of hydrological risk (Law 14,052/20), net   1,032  
Equity in earnings of unconsolidated investees, net   R$ 182  
Periodic Tariff Revision, net     R$ 502