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9 Net Sectorial Financial Assets and Liabilities (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]    
Net sectorial financial assets and liabilities, beginning R$ 371,705 R$ 582,288
Operating revenues, constitution 836,048 515,934
Operating revenues, amortization (89,996) (490,877)
Financial results, updating 20,106 41,625
Write-offs Covid Account (869,516)  
Rate flags (110,126) (277,265)
Net sectorial financial assets and liabilities, ending 158,221 371,705
Sectorial financial assets, current 173,465 355,570
Sectorial financial assets, noncurrent 173,465 118,419
Sectorial financial liabilities, current (188,709)
Sectorial financial liabilities, noncurrent (102,284)
Adjusting portion A [member] | Electricity purchased for resale - itaipu [member]    
Disclosure of financial assets [line items]    
Net sectorial financial assets and liabilities, beginning 793,327 886,243
Operating revenues, constitution 893,581 533,057
Operating revenues, amortization (354,300) (670,501)
Financial results, updating 28,197 44,528
Write-offs Covid Account (897,629)  
Rate flags
Net sectorial financial assets and liabilities, ending 463,176 793,327
Adjusting portion A [member] | Electricity purchased for resale - cva energ [member]    
Disclosure of financial assets [line items]    
Net sectorial financial assets and liabilities, beginning 265,788 626,891
Operating revenues, constitution (242,246) 358,200
Operating revenues, amortization (253,482) (546,801)
Financial results, updating 1,076 29,909
Write-offs Covid Account 164,804  
Rate flags (35,993) (202,411)
Net sectorial financial assets and liabilities, ending (100,053) 265,788
Adjusting portion A [member] | Transport of energy using the transmission system - basic grid [member]    
Disclosure of financial assets [line items]    
Net sectorial financial assets and liabilities, beginning 13,038 (30,514)
Operating revenues, constitution 265,030 22,917
Operating revenues, amortization 48,154 23,688
Financial results, updating 1,715 (3,053)
Write-offs Covid Account (151,060)  
Rate flags
Net sectorial financial assets and liabilities, ending 176,877 13,038
Adjusting portion A [member] | Transport of energy purchased from itaipu [member]    
Disclosure of financial assets [line items]    
Net sectorial financial assets and liabilities, beginning 24,391 23,250
Operating revenues, constitution 31,762 19,531
Operating revenues, amortization (10,503) (19,692)
Financial results, updating 801 1,302
Write-offs Covid Account (26,705)  
Rate flags
Net sectorial financial assets and liabilities, ending 19,746 24,391
Adjusting portion A [member] | System service charges - ESS [member]    
Disclosure of financial assets [line items]    
Net sectorial financial assets and liabilities, beginning (264,949) (481,972)
Operating revenues, constitution (72,032) (188,280)
Operating revenues, amortization 169,396 427,177
Financial results, updating (8,854) (21,874)
Write-offs Covid Account 249,724  
Rate flags (54,154)
Net sectorial financial assets and liabilities, ending 19,131 (264,949)
Adjusting portion A [member] | Energy development account - CDE [member]    
Disclosure of financial assets [line items]    
Net sectorial financial assets and liabilities, beginning 152,928 159,084
Operating revenues, constitution 56,608 110,752
Operating revenues, amortization (102,027) (127,190)
Financial results, updating 5,065 10,282
Write-offs Covid Account (114,446)  
Rate flags
Net sectorial financial assets and liabilities, ending (1,872) 152,928
Adjusting portion A [member] | Proinfa [member]    
Disclosure of financial assets [line items]    
Net sectorial financial assets and liabilities, beginning 8,468 2,989
Operating revenues, constitution (21,615) 17,396
Operating revenues, amortization (8,856) (12,636)
Financial results, updating (181) 719
Write-offs Covid Account 22,039  
Rate flags
Net sectorial financial assets and liabilities, ending (145) 8,468
Other financial components [member] | Neutrality [member]    
Disclosure of financial assets [line items]    
Net sectorial financial assets and liabilities, beginning 48,506 123,028
Operating revenues, constitution 95,870 (1,122)
Operating revenues, amortization (52,843) (74,698)
Financial results, updating 187 1,298
Write-offs Covid Account (14,455)  
Rate flags
Net sectorial financial assets and liabilities, ending 77,265 48,506
Other financial components [member] | Offset of energy surplus/deficit under CCEAR bilateral contracts [member]    
Disclosure of financial assets [line items]    
Net sectorial financial assets and liabilities, beginning 40,192 5,237
Operating revenues, constitution 75,917 80,385
Operating revenues, amortization (79,714) (45,430)
Financial results, updating
Write-offs Covid Account  
Rate flags
Net sectorial financial assets and liabilities, ending 36,395 40,192
Other financial components [member] | CVA angra III adjustment [member]    
Disclosure of financial assets [line items]    
Net sectorial financial assets and liabilities, beginning 6,272
Operating revenues, constitution  
Operating revenues, amortization   (6,272)
Financial results, updating  
Rate flags  
Net sectorial financial assets and liabilities, ending  
Other financial components [member] | Hydrological risk [member]    
Disclosure of financial assets [line items]    
Net sectorial financial assets and liabilities, beginning (347,160) (319,033)
Operating revenues, constitution (444,291) (324,504)
Operating revenues, amortization 322,432 304,197
Financial results, updating (5,092) (7,820)
Write-offs Covid Account  
Rate flags
Net sectorial financial assets and liabilities, ending (474,111) (347,160)
Other financial components [member] | Tariff refunds [member]    
Disclosure of financial assets [line items]    
Net sectorial financial assets and liabilities, beginning (194,253) (180,963)
Operating revenues, constitution (83,514) (89,327)
Operating revenues, amortization 88,269 83,900
Financial results, updating (4,171) (7,863)
Write-offs Covid Account  
Rate flags
Net sectorial financial assets and liabilities, ending (193,669) (194,253)
Other financial components [member] | Overcontracting [member]    
Disclosure of financial assets [line items]    
Net sectorial financial assets and liabilities, beginning (168,123) (238,416)
Operating revenues, constitution 274,051 (22,166)
Operating revenues, amortization 145,853 173,087
Financial results, updating 663 (5,774)
Write-offs Covid Account (101,788)  
Rate flags (19,979) (74,854)
Net sectorial financial assets and liabilities, ending 130,677 (168,123)
Other financial components [member] | Others [member]    
Disclosure of financial assets [line items]    
Net sectorial financial assets and liabilities, beginning (448) 192
Operating revenues, constitution 6,927 (905)
Operating revenues, amortization (2,375) 294
Financial results, updating 700 (29)
Write-offs Covid Account  
Rate flags
Net sectorial financial assets and liabilities, ending R$ 4,804 R$ (448)