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ACCOUNTS RECEIVABLE, NET - Schedule (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
ACCOUNTS RECEIVABLE, NET    
Financial assets   R$ 1,264,059
Current R$ 5,210,482 4,794,924
Non-current 649,446 703,055
Gross value    
ACCOUNTS RECEIVABLE, NET    
Current 5,210,482 4,794,924
Non-current 649,446 703,055
Total Customers 5,859,928 5,497,979
Gross value | Supply/Power Supply    
ACCOUNTS RECEIVABLE, NET    
Current 4,143,112 3,568,103
Non-current 1,201,416 1,573,358
Gross value | Short Term Electric Power - CCEE    
ACCOUNTS RECEIVABLE, NET    
Current 582,586 336,614
Non-current 280,138 280,138
Gross value | Use of the Electric Grid    
ACCOUNTS RECEIVABLE, NET    
Current 2,107,085 1,581,756
Non-current 4,348 4,348
Gross value | PROINFA    
ACCOUNTS RECEIVABLE, NET    
Current   462,608
Gross value | Renegotiated Agreements    
ACCOUNTS RECEIVABLE, NET    
Current 1,289,224 987,917
Gross value | Due    
ACCOUNTS RECEIVABLE, NET    
Current 4,875,267  
Total Customers 4,875,267  
Gross value | Due | Supply/Power Supply    
ACCOUNTS RECEIVABLE, NET    
Current 2,705,302  
Gross value | Due | Short Term Electric Power - CCEE    
ACCOUNTS RECEIVABLE, NET    
Current 255,878  
Gross value | Due | Use of the Electric Grid    
ACCOUNTS RECEIVABLE, NET    
Current 1,677,256  
Gross value | Due | Renegotiated Agreements    
ACCOUNTS RECEIVABLE, NET    
Current 433,508  
Gross value | Overdue up to 90 days    
ACCOUNTS RECEIVABLE, NET    
Current 698,060  
Total Customers 698,060  
Gross value | Overdue up to 90 days | Supply/Power Supply    
ACCOUNTS RECEIVABLE, NET    
Current 477,617  
Gross value | Overdue up to 90 days | Short Term Electric Power - CCEE    
ACCOUNTS RECEIVABLE, NET    
Current 315,171  
Gross value | Overdue up to 90 days | Use of the Electric Grid    
ACCOUNTS RECEIVABLE, NET    
Current 150,290  
Gross value | Overdue up to 90 days | Renegotiated Agreements    
ACCOUNTS RECEIVABLE, NET    
Current 118,763  
Gross value | Overdue 90+ days    
ACCOUNTS RECEIVABLE, NET    
Current 288,039  
Total Customers 288,039  
Gross value | Overdue 90+ days | Supply/Power Supply    
ACCOUNTS RECEIVABLE, NET    
Current 900,401  
Non-current 9,548  
Gross value | Overdue 90+ days | Short Term Electric Power - CCEE    
ACCOUNTS RECEIVABLE, NET    
Current 11,537  
Non-current 280,138  
Gross value | Overdue 90+ days | Use of the Electric Grid    
ACCOUNTS RECEIVABLE, NET    
Current 279,539  
Non-current 4,348  
Gross value | Overdue 90+ days | Renegotiated Agreements    
ACCOUNTS RECEIVABLE, NET    
Current 736,953  
Gross value | Renegotiated Credits    
ACCOUNTS RECEIVABLE, NET    
Current 48,679  
Non-current 649,446  
Total Customers 698,125  
Gross value | Renegotiated Credits | Supply/Power Supply    
ACCOUNTS RECEIVABLE, NET    
Current 59,792  
Non-current 1,191,868  
Customers, current | Gross value    
ACCOUNTS RECEIVABLE, NET    
(-) ECL (2,911,525) (2,142,074)
Customers, current | Gross value | Due    
ACCOUNTS RECEIVABLE, NET    
(-) ECL (667,894)  
Customers, current | Gross value | Overdue up to 90 days    
ACCOUNTS RECEIVABLE, NET    
(-) ECL (414,527)  
Customers, current | Gross value | Overdue 90+ days    
ACCOUNTS RECEIVABLE, NET    
(-) ECL (1,817,991)  
Customers, current | Gross value | Renegotiated Credits    
ACCOUNTS RECEIVABLE, NET    
(-) ECL (11,113)  
Customers, non-current | Gross value    
ACCOUNTS RECEIVABLE, NET    
(-) ECL (836,456) R$ (1,154,789)
Customers, non-current | Gross value | Overdue 90+ days    
ACCOUNTS RECEIVABLE, NET    
(-) ECL (294,034)  
Customers, non-current | Gross value | Renegotiated Credits    
ACCOUNTS RECEIVABLE, NET    
(-) ECL R$ (542,422)