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FIXED ASSETS, NET - Average depreciation rate and accumulated depreciation (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Nov. 30, 2021
Dec. 31, 2019
PP&E        
Control of acquired, percentage 100.00%      
PP&E R$ 33,367,981 R$ 32,662,912    
Net value 40,331,586 40,228,380    
Transmissora Sul Litornea de Energia -TSLE        
PP&E        
Control of acquired, percentage     100.00%  
UTN Angra 3        
PP&E        
Net value 14,600,060 13,266,022    
Gross value        
PP&E        
PP&E 86,027,150 84,560,273    
Accumulated depreciation        
PP&E        
PP&E (45,695,565) (44,331,893)    
Fixed assets in service        
PP&E        
Net value 21,802,938 21,961,301    
Fixed assets in service | Gross value        
PP&E        
PP&E 66,430,445 65,285,197    
Fixed assets in service | Accumulated depreciation        
PP&E        
PP&E (44,627,507) (43,323,896)    
Fixed assets in service | Right-of-use        
PP&E        
PP&E 1,044,304 1,107,704    
Fixed assets in service | Right-of-use | Gross value        
PP&E        
PP&E 2,112,362 2,115,701    
Fixed assets in service | Right-of-use | Accumulated depreciation        
PP&E        
PP&E R$ (1,068,058) R$ (1,007,997)    
Dams, reservoirs and water mains        
PP&E        
Average rate of depreciation 2.18% 2.16%    
PP&E R$ 6,412,995 R$ 6,689,554    
Dams, reservoirs and water mains | Gross value        
PP&E        
PP&E 15,418,627 15,389,704    
Dams, reservoirs and water mains | Accumulated depreciation        
PP&E        
PP&E R$ (9,005,632) R$ (8,700,150)    
Buildings, civil works and improvements        
PP&E        
Average rate of depreciation 2.57% 2.67%    
PP&E R$ 2,885,165 R$ 3,124,535    
Buildings, civil works and improvements | Gross value        
PP&E        
PP&E 8,214,167 8,265,536    
Buildings, civil works and improvements | Accumulated depreciation        
PP&E        
PP&E R$ (5,329,002) R$ (5,141,001)    
Buildings, civil works and improvements | Right-of-use        
PP&E        
Average rate of depreciation 10.97% 13.71%    
PP&E R$ 170,631 R$ 156,901    
Buildings, civil works and improvements | Right-of-use | Gross value        
PP&E        
PP&E 239,806 252,640    
Buildings, civil works and improvements | Right-of-use | Accumulated depreciation        
PP&E        
PP&E R$ (69,175) R$ (95,739)    
Machines and equipment        
PP&E        
Average rate of depreciation 4.38% 4.06%    
PP&E R$ 12,225,807 R$ 11,928,760    
Machines and equipment | Gross value        
PP&E        
PP&E 42,054,751 40,448,965    
Machines and equipment | Accumulated depreciation        
PP&E        
PP&E R$ (29,828,944) R$ (28,520,205)    
Machines and equipment | Right-of-use        
PP&E        
Average rate of depreciation 3.87% 4.45%    
PP&E R$ 861,977 R$ 946,935    
Machines and equipment | Right-of-use | Gross value        
PP&E        
PP&E 1,858,559 1,858,606    
Machines and equipment | Right-of-use | Accumulated depreciation        
PP&E        
PP&E R$ (996,582) R$ (911,671)    
Others        
PP&E        
Average rate of depreciation 5.30% 5.14%    
PP&E R$ 278,971 R$ 218,452    
Others | Gross value        
PP&E        
PP&E 742,900 1,180,992    
Others | Accumulated depreciation        
PP&E        
PP&E R$ (463,929) R$ (962,540)    
Others | Right-of-use        
PP&E        
Average rate of depreciation 2.40% 2.28%    
PP&E R$ 11,696 R$ 3,868    
Others | Right-of-use | Gross value        
PP&E        
PP&E 13,997 4,455    
Others | Right-of-use | Accumulated depreciation        
PP&E        
PP&E (2,301) (587)    
Fixed assets in progress and its provision        
PP&E        
PP&E 17,484,344 17,159,375    
Net value 4,508,764 4,508,764   R$ 4,508,764
Fixed assets in progress and its provision | Gross value        
PP&E        
PP&E 17,484,344 17,159,375    
Fixed assets in progress        
PP&E        
Net value 17,484,344 17,159,375   R$ 12,012,251
Fixed assets in progress | UTN Angra 3        
PP&E        
Net value   13,266,022    
Fixed assets in progress | Gross value        
PP&E        
PP&E R$ 17,484,344 R$ 17,159,375