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Schedule of operating revenues, costs and expenses (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
NET REVENUE R$ 33,646 R$ 25,228 R$ 25,486
Materials, outsourced services and others expenses (revenues) 94 79 91
Construction costs 2,036 1,581 1,200
OPERATING COSTS AND EXPENSES 28,237 21,432 22,474
Result of business combination (4) (51)
OPERATING INCOME BEFORE  FINANCE INCOME (EXPENSES) 6,951 4,706 3,210
Finance  expenses 844 2,445 3,207
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 4,699 3,801 4,570
Income tax and social contribution tax (946) (936)  
NET INCOME FOR THE YEAR 3,753 2,865 2,971
Operating segments [member] | Transmission Segment [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 2,921 2,589 3,755
COST OF ENERGY AND GAS (795) (528) (658)
Personnel (149) (170) (164)
Employees’ and managers’ profit sharing (14) (16) (24)
Post-employment obligations (5) (42) (34)
Materials, outsourced services and others expenses (revenues) (209) (178) (170)
Depreciation and amortization (254) (205) (212)
Operating provisions and impairment (20) (32) (271)
Construction costs
Total cost of operation (651) (643) (875)
OPERATING COSTS AND EXPENSES (1,446) (1,171) (1,533)
Periodic tariff review, net 23
Dividends declared by investee classified as held for sale 1,032  
Gains arising from the sale of non-current asset held for sale    
Equity in earnings of unconsolidated investees, net 54 11  
Result of business combination    
OPERATING INCOME BEFORE  FINANCE INCOME (EXPENSES) 2,561 1,429 2,245
Finance  expenses (758) (322) 113
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 1,803 1,107 2,358
Income tax and social contribution tax (409) (308) (641)
NET INCOME FOR THE YEAR 1,394 799 1,717
Equity holders of the parent 1,394 799  
Non-controlling interests  
Fair value of business combination    
Net income after tax from discontinued operations    
 Net income from continuing operations     1,717
 Net income from discontinued operations    
Net income for the year attributed to equity holders of the parent     1,717
Net income from continuing operations    
Operating segments [member] | Tranding Segment [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 1,094 778 934
COST OF ENERGY AND GAS
Personnel (115) (102) (113)
Employees’ and managers’ profit sharing (14) (14) (27)
Post-employment obligations 3 (38) (38)
Materials, outsourced services and others expenses (revenues) (94) (65) (67)
Depreciation and amortization (3) (5) (3)
Operating provisions and impairment (12) 7 (72)
Construction costs (184) (147) (221)
Total cost of operation (419) (364) (541)
OPERATING COSTS AND EXPENSES (419) (364) (541)
Periodic tariff review, net 215 502 4
Dividends declared by investee classified as held for sale   73
Gains arising from the sale of non-current asset held for sale    
Equity in earnings of unconsolidated investees, net  
Result of business combination 4    
OPERATING INCOME BEFORE  FINANCE INCOME (EXPENSES) 894 967 470
Finance  expenses (395) (152) 98
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 499 815 568
Income tax and social contribution tax (78) (222) (112)
NET INCOME FOR THE YEAR 421 593 456
Equity holders of the parent 421 593  
Non-controlling interests  
Fair value of business combination   51  
Net income after tax from discontinued operations    
 Net income from continuing operations     456
 Net income from discontinued operations    
Net income for the year attributed to equity holders of the parent     456
Net income from continuing operations    
Operating segments [member] | Distribution Segment [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 6,430 5,382 4,595
COST OF ENERGY AND GAS (5,735) (5,027) (4,801)
Personnel (20) (16) (19)
Employees’ and managers’ profit sharing (3) (2) (5)
Post-employment obligations (1) (6) (7)
Materials, outsourced services and others expenses (revenues) (14) (11) (14)
Depreciation and amortization (1) (1)
Operating provisions and impairment (14) (1) (10)
Construction costs
Total cost of operation (53) (37) (55)
OPERATING COSTS AND EXPENSES (5,788) (5,064) (4,856)
Periodic tariff review, net
Dividends declared by investee classified as held for sale  
Gains arising from the sale of non-current asset held for sale    
Equity in earnings of unconsolidated investees, net  
Result of business combination    
OPERATING INCOME BEFORE  FINANCE INCOME (EXPENSES) 642 318 (261)
Finance  expenses 15 21 10
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 657 339 (251)
Income tax and social contribution tax (224) (81) 150
NET INCOME FOR THE YEAR 433 258 (101)
Equity holders of the parent 433 258  
Non-controlling interests  
Fair value of business combination    
Net income after tax from discontinued operations    
 Net income from continuing operations     (101)
 Net income from discontinued operations    
Net income for the year attributed to equity holders of the parent     (101)
Net income from continuing operations    
Operating segments [member] | Other Segments [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 22,345 16,512 15,919
COST OF ENERGY AND GAS (14,853) (9,960) (8,975)
Personnel (847) (886) (869)
Employees’ and managers’ profit sharing (94) (93) (183)
Post-employment obligations 19 (297) (277)
Materials, outsourced services and others expenses (revenues) (1,524) (1,327) (1,375)
Depreciation and amortization (683) (668) (652)
Operating provisions and impairment (198) (274) (1,103)
Construction costs (1,802) (1,384) (936)
Total cost of operation (5,129) (4,929) (5,395)
OPERATING COSTS AND EXPENSES (19,982) (14,889) (14,370)
Periodic tariff review, net
Dividends declared by investee classified as held for sale  
Gains arising from the sale of non-current asset held for sale    
Equity in earnings of unconsolidated investees, net  
Result of business combination    
OPERATING INCOME BEFORE  FINANCE INCOME (EXPENSES) 2,363 1,623 1,549
Finance  expenses (7) 22 902
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 2,356 1,645 2,450
Income tax and social contribution tax (655) (430) (806)
NET INCOME FOR THE YEAR 1,701 1,215 1,644
Equity holders of the parent 1,701 1,215  
Non-controlling interests  
Fair value of business combination    
Net income after tax from discontinued operations    
 Net income from continuing operations     1,644
 Net income from discontinued operations    
Net income for the year attributed to equity holders of the parent     1,644
Net income from continuing operations    
Operating segments [member] | Investees Segments [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 2,858 1,673 2,054
COST OF ENERGY AND GAS (2,011) (1,083) (1,436)
Personnel (109) (102) (107)
Employees’ and managers’ profit sharing (9) (17) (24)
Post-employment obligations (32) (55) (52)
Materials, outsourced services and others expenses (revenues) (165) (110) (247)
Depreciation and amortization (108) (110) (91)
Operating provisions and impairment (120) (123) (945)
Construction costs (50) (50) (43)
Total cost of operation (593) (567) (1,509)
OPERATING COSTS AND EXPENSES (2,604) (1,650) (2,945)
Periodic tariff review, net 98
Dividends declared by investee classified as held for sale  
Gains arising from the sale of non-current asset held for sale 109    
Equity in earnings of unconsolidated investees, net 128 346  
Result of business combination    
OPERATING INCOME BEFORE  FINANCE INCOME (EXPENSES) 491 369 (793)
Finance  expenses (1,107) (474) 237
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX (616) (105) (555)
Income tax and social contribution tax 420 105 (191)
NET INCOME FOR THE YEAR (196) (522)
Equity holders of the parent (198) (1)  
Non-controlling interests 2 1  
Fair value of business combination    
Net income after tax from discontinued operations     224
 Net income from continuing operations     (747)
 Net income from discontinued operations     224
Net income for the year attributed to equity holders of the parent     (523)
Net income from continuing operations     1
Operating segments [member] | Total Segments [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 35,648 26,934 27,257
COST OF ENERGY AND GAS (23,394) (16,598) (15,870)
Personnel (1,240) (1,276) (1,272)
Employees’ and managers’ profit sharing (134) (142) (263)
Post-employment obligations (16) (438) (408)
Materials, outsourced services and others expenses (revenues) (2,006) (1,691) (1,873)
Depreciation and amortization (1,049) (989) (958)
Operating provisions and impairment (364) (423) (2,401)
Construction costs (2,036) (1,581) (1,200)
Total cost of operation (6,845) (6,540) (8,375)
OPERATING COSTS AND EXPENSES (30,239) (23,138) (24,245)
Periodic tariff review, net 215 502 125
Dividends declared by investee classified as held for sale 1,032   73
Gains arising from the sale of non-current asset held for sale 109    
Equity in earnings of unconsolidated investees, net 182 357  
Result of business combination 4    
OPERATING INCOME BEFORE  FINANCE INCOME (EXPENSES) 6,951 4,706 3,210
Finance  expenses (2,252) (905) 1,360
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 4,699 3,801 4,570
Income tax and social contribution tax (946) (936) (1,600)
NET INCOME FOR THE YEAR 3,753 2,865 3,194
Equity holders of the parent 3,751 2,864  
Non-controlling interests 2 1  
Fair value of business combination   51  
Net income after tax from discontinued operations     224
 Net income from continuing operations     2,969
 Net income from discontinued operations     224
Net income for the year attributed to equity holders of the parent     3,193
Net income from continuing operations     1
Operating segments [member] | Intersegment Transactions Segments [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE (1,575) (1,324) (1,409)
COST OF ENERGY AND GAS 1,575 1,324 1,409
Personnel
Employees’ and managers’ profit sharing
Post-employment obligations
Materials, outsourced services and others expenses (revenues)
Depreciation and amortization
Operating provisions and impairment
Construction costs
Total cost of operation
OPERATING COSTS AND EXPENSES 1,575 1,324 1,409
Periodic tariff review, net
Dividends declared by investee classified as held for sale  
Gains arising from the sale of non-current asset held for sale    
Equity in earnings of unconsolidated investees, net  
Result 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  
Fair value of business combination    
Net income after tax from discontinued operations    
 Net income from continuing operations    
 Net income from discontinued operations    
Net income for the year attributed to equity holders of the parent    
Net income from continuing operations    
Operating segments [member] | Reconciliation Segments [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE (427) (382) (362)
COST OF ENERGY AND GAS 370 332 313
Personnel
Employees’ and managers’ profit sharing
Post-employment obligations
Materials, outsourced services and others expenses (revenues) 57 50 49
Depreciation and amortization
Operating provisions and impairment
Construction costs
Total cost of operation 57 50 49
OPERATING COSTS AND EXPENSES 427 382 362
Periodic tariff review, net
Dividends declared by investee classified as held for sale  
Gains arising from the sale of non-current asset held for sale    
Equity in earnings of unconsolidated investees, net  
Result 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  
Fair value of business combination    
Net income after tax from discontinued operations    
 Net income from continuing operations    
 Net income from discontinued operations    
Net income for the year attributed to equity holders of the parent    
Net income from continuing operations    
Operating segments [member] | All other segments [member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 33,646 25,228 25,486
COST OF ENERGY AND GAS (21,449) (14,942) (14,148)
Personnel (1,240) (1,276) (1,272)
Employees’ and managers’ profit sharing (134) (142) (263)
Post-employment obligations (16) (438) (408)
Materials, outsourced services and others expenses (revenues) (1,949) (1,641) (1,824)
Depreciation and amortization (1,049) (989) (958)
Operating provisions and impairment (364) (423) (2,401)
Construction costs (2,036) (1,581) (1,200)
Total cost of operation (6,788) (6,490) (8,326)
OPERATING COSTS AND EXPENSES (28,237) (21,432) (22,474)
Periodic tariff review, net 215 502 125
Dividends declared by investee classified as held for sale 1,032   73
Gains arising from the sale of non-current asset held for sale 109    
Equity in earnings of unconsolidated investees, net 182 357  
Result of business combination 4    
OPERATING INCOME BEFORE  FINANCE INCOME (EXPENSES) 6,951 4,706 3,210
Finance  expenses (2,252) (905) 1,360
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 4,699 3,801 4,570
Income tax and social contribution tax (946) (936) (1,600)
NET INCOME FOR THE YEAR 3,753 2,865 3,194
Equity holders of the parent 3,751 2,864  
Non-controlling interests R$ 2 1  
Fair value of business combination   R$ 51  
Net income after tax from discontinued operations     224
 Net income from continuing operations     2,969
 Net income from discontinued operations     224
Net income for the year attributed to equity holders of the parent     3,193
Net income from continuing operations     R$ 1