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Schedule of Changes in net sectorial financial assets and liabilities (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Net sectorial financial assets and liabilities, beginning R$ 158,221 R$ 371,705
Operating revenues, constitution 2,173,139 836,048
Operating revenues, amortization 329,185 (89,996)
Financial results, updating 32,158 20,106
Net sectorial financial assets and liabilities, ending 474,301 158,221
Rate flags (1,423,066) (110,126)
[custom:FinancialResultsConstitution] (795,336)  
Sectorial financial assets, current 173,465 355,570
Sectorial financial assets, current 383,740 173,465
Other non-current financial assets 173,465 118,419
Other non-current financial assets 383,740 173,465
Other current financial liabilities (188,709)  
Other current financial liabilities (139,770) (188,709)
[custom:OtherNoncurrentFinancialLiabilities1-2] (153,409)  
Write-offs Covid Account   (869,516)
Other non-current financial liabilities (102,284)
Portion A | Electricity purchased for resale - Itaipu    
IfrsStatementLineItems [Line Items]    
Net sectorial financial assets and liabilities, beginning 463,176 793,327
Operating revenues, constitution 1,133,849 893,581
Operating revenues, amortization (348,804) (354,300)
Financial results, updating 38,745 28,197
Net sectorial financial assets and liabilities, ending 1,286,966 463,176
Rate flags  
Write-offs Covid Account   (897,629)
Portion A | C V A Energ [Member]    
IfrsStatementLineItems [Line Items]    
Net sectorial financial assets and liabilities, beginning (100,053) 265,788
Operating revenues, constitution 640,205 (242,246)
Operating revenues, amortization 128,545 (253,482)
Financial results, updating (1,303) 1,076
Net sectorial financial assets and liabilities, ending (475,842) (100,053)
Rate flags (1,143,236) (35,993)
Write-offs Covid Account   164,804
Portion A | Charges For Using The Transmission System Basic Grid [Member]    
IfrsStatementLineItems [Line Items]    
Net sectorial financial assets and liabilities, beginning 176,877 13,038
Operating revenues, constitution 164,203 265,030
Operating revenues, amortization (170,538) 48,154
Financial results, updating 9,979 1,715
Net sectorial financial assets and liabilities, ending 180,521 176,877
Write-offs Covid Account   (151,060)
Portion A | Transport Of Energy Purchased From Itaipu [Member]    
IfrsStatementLineItems [Line Items]    
Net sectorial financial assets and liabilities, beginning 19,746 24,391
Operating revenues, constitution 10,933 31,762
Operating revenues, amortization (17,746) (10,503)
Financial results, updating 1,085 801
Net sectorial financial assets and liabilities, ending 14,018 19,746
Write-offs Covid Account   (26,705)
Portion A | E S S [Member]    
IfrsStatementLineItems [Line Items]    
Net sectorial financial assets and liabilities, beginning 19,131 (264,949)
Operating revenues, constitution 728,954 (72,032)
Operating revenues, amortization (23,429) 169,396
Financial results, updating 2,374 (8,854)
Net sectorial financial assets and liabilities, ending 531,280 19,131
Rate flags (195,750) (54,154)
Write-offs Covid Account   249,724
Portion A | C D E [Member]    
IfrsStatementLineItems [Line Items]    
Net sectorial financial assets and liabilities, beginning (1,872) 152,928
Operating revenues, constitution 22,765 56,608
Operating revenues, amortization (41,260) (102,027)
Financial results, updating 1,581 5,065
Net sectorial financial assets and liabilities, ending (18,786) (1,872)
Write-offs Covid Account   (114,446)
Portion A | Proinfa [Member]    
IfrsStatementLineItems [Line Items]    
Net sectorial financial assets and liabilities, beginning (145) 8,468
Operating revenues, constitution 22,155 (21,615)
Operating revenues, amortization (11,812) (8,856)
Financial results, updating 303 (181)
Net sectorial financial assets and liabilities, ending 10,501 (145)
Write-offs Covid Account   22,039
Other financial components | Refunds Of Pis And Cofins [Member]    
IfrsStatementLineItems [Line Items]    
Operating revenues, amortization 364,650  
Net sectorial financial assets and liabilities, ending (337,350)  
[custom:FinancialResultsConstitution] (702,000)  
Other financial components | Neutrality    
IfrsStatementLineItems [Line Items]    
Net sectorial financial assets and liabilities, beginning 77,265 48,506
Operating revenues, constitution 60,608 95,870
Operating revenues, amortization (57,925) (52,843)
Financial results, updating 1,229 187
Net sectorial financial assets and liabilities, ending 81,177 77,265
Write-offs Covid Account   (14,455)
Other financial components | Offset Of Energy Surplus Deficit Under C C E A R Bilateral Contracts [Member]    
IfrsStatementLineItems [Line Items]    
Net sectorial financial assets and liabilities, beginning 36,395 40,192
Operating revenues, constitution (383) 75,917
Operating revenues, amortization (36,196) (79,714)
Net sectorial financial assets and liabilities, ending (184) 36,395
Other financial components | Hydrological risk    
IfrsStatementLineItems [Line Items]    
Net sectorial financial assets and liabilities, beginning (474,111) (347,160)
Operating revenues, constitution (562,663) (444,291)
Operating revenues, amortization 443,644 322,432
Financial results, updating (11,022) (5,092)
Net sectorial financial assets and liabilities, ending (604,152) (474,111)
Other financial components | Tariff refunds    
IfrsStatementLineItems [Line Items]    
Net sectorial financial assets and liabilities, beginning (193,669) (194,253)
Operating revenues, constitution (97,684) (83,514)
Operating revenues, amortization 100,956 88,269
Financial results, updating (8,600) (4,171)
Net sectorial financial assets and liabilities, ending (198,997) (193,669)
Other financial components | Overcontracting    
IfrsStatementLineItems [Line Items]    
Net sectorial financial assets and liabilities, beginning 130,677 (168,123)
Operating revenues, constitution (99,743) 274,051
Operating revenues, amortization (23,230) 145,853
Financial results, updating (2,220) 663
Net sectorial financial assets and liabilities, ending (78,596) 130,677
Rate flags (84,080) (19,979)
Write-offs Covid Account   (101,788)
Other financial components | Itaipu Bonus [Member]    
IfrsStatementLineItems [Line Items]    
Operating revenues, constitution 60,065  
Financial results, updating 220  
Net sectorial financial assets and liabilities, ending (26,451)  
[custom:FinancialResultsConstitution] (86,736)  
Other financial components | Others [Member]    
IfrsStatementLineItems [Line Items]    
Net sectorial financial assets and liabilities, beginning 4,804 (448)
Operating revenues, constitution 89,875 6,927
Operating revenues, amortization 22,330 (2,375)
Financial results, updating (213) 700
Net sectorial financial assets and liabilities, ending 110,196 R$ 4,804
[custom:FinancialResultsConstitution] R$ (6,600)