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9 Net Sectorial Financial Assets and Liabilities (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning R$ 582,288 R$ 59,699  
Operating revenues, constitution 515,934 965,452  
Operating revenues, amortization (490,877) 19,892  
Financial results, updating 41,625 20,219  
Rate flags (277,265) (482,974)  
Net sectorial financial assets and liabilities, ending 371,705 582,288  
Sectorial financial assets, current 355,570 421,184 R$ 171,609
Sectorial financial assets, noncurrent 118,419 257,635 171,609
Sectorial financial liabilities, current   192,819
Sectorial financial liabilities, noncurrent (102,284) (96,531) R$ (90,700)
Adjusting Portion A [Member] | Electricity Purchased For Resale - Itaipu [Member]      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning 886,243 537,704  
Operating revenues, constitution 533,057 661,144  
Operating revenues, amortization (670,501) (348,586)  
Financial results, updating 44,528 35,981  
Rate flags  
Net sectorial financial assets and liabilities, ending 793,327 886,243  
Adjusting Portion A [Member] | Electricity Purchased For Resale - Cva Energ [Member]      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning 626,891 497,885  
Operating revenues, constitution 358,200 710,482  
Operating revenues, amortization (546,801) (129,555)  
Financial results, updating 29,909 31,053  
Rate flags (202,411) (482,974)  
Net sectorial financial assets and liabilities, ending 265,788 626,891  
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 (30,514) 47,239  
Operating revenues, constitution 22,917 (36,959)  
Operating revenues, amortization 23,688 (43,101)  
Financial results, updating (3,053) 2,307  
Rate flags  
Net sectorial financial assets and liabilities, ending 13,038 (30,514)  
Adjusting Portion A [Member] | Transport Of Energy Purchased From Itaipu [Member]      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning 23,250 12,923  
Operating revenues, constitution 19,531 21,526  
Operating revenues, amortization (19,692) (12,194)  
Financial results, updating 1,302 995  
Rate flags  
Net sectorial financial assets and liabilities, ending 24,391 23,250  
Adjusting Portion A [Member] | System Service Charges - ESS [Member]      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning (481,972) (591,408)  
Operating revenues, constitution (188,280) (302,226)  
Operating revenues, amortization 427,177 443,817  
Financial results, updating (21,874) (32,155)  
Rate flags  
Net sectorial financial assets and liabilities, ending (264,949) (481,972)  
Adjusting Portion A [Member] | Energy Development Account - CDE [Member]      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning 159,084 (141,893)  
Operating revenues, constitution 110,752 231,308  
Operating revenues, amortization (127,190) 69,851  
Financial results, updating 10,282 (182)  
Rate flags  
Net sectorial financial assets and liabilities, ending 152,928 159,084  
Adjusting Portion A [Member] | Proinfa [Member]      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning 2,989 (5,188)  
Operating revenues, constitution 17,396 6,111  
Operating revenues, amortization (12,636) 2,024  
Financial results, updating 719 42  
Rate flags  
Net sectorial financial assets and liabilities, ending 8,468 2,989  
Other Financial Components [Member] | Neutrality [Member]      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning 123,028 121,247  
Operating revenues, constitution (1,122) 100,280  
Operating revenues, amortization (74,698) (100,661)  
Financial results, updating 1,298 2,162  
Rate flags  
Net sectorial financial assets and liabilities, ending 48,506 123,028  
Other Financial Components [Member] | CVA Angra III Adjustment [Member]      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning 6,272 48,193  
Operating revenues, constitution 8,482  
Operating revenues, amortization (6,272) (57,214)  
Financial results, updating 6,811  
Rate flags  
Net sectorial financial assets and liabilities, ending 6,272  
Other Financial Components [Member] | Hydrological Risk [Member]      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning (319,033) (187,928)  
Operating revenues, constitution (324,504) (310,975)  
Operating revenues, amortization 304,197 189,289  
Financial results, updating (7,820) (9,419)  
Rate flags  
Net sectorial financial assets and liabilities, ending (347,160) (319,033)  
Other Financial Components [Member] | Tariff Refunds [Member]      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning (180,963) (145,774)  
Operating revenues, constitution (89,327) (80,493)  
Operating revenues, amortization 83,900 52,290  
Financial results, updating (7,863) (6,986)  
Rate flags  
Net sectorial financial assets and liabilities, ending (194,253) (180,963)  
Other Financial Components [Member] | Overcontracting [Member]      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning (238,416) (136,325)  
Operating revenues, constitution (22,166) (54,421)  
Operating revenues, amortization 173,087 (37,176)  
Financial results, updating (5,774) (10,494)  
Rate flags (74,854)  
Net sectorial financial assets and liabilities, ending (168,123) (238,416)  
Other Financial Components [Member] | Others [Member]      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning 5,429 3,024  
Operating revenues, constitution (905) 11,193  
Operating revenues, amortization 294 (8,892)  
Financial results, updating (29) 104  
Rate flags  
Net sectorial financial assets and liabilities, ending (448) 5,429  
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 5,237    
Operating revenues, constitution 80,385    
Operating revenues, amortization (45,430)    
Financial results, updating    
Rate flags    
Net sectorial financial assets and liabilities, ending R$ 40,192 R$ 5,237