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12 Other Receivables (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value measurement of assets [line items]    
Other receivables R$ 1,359,645 R$ 1,088,624
Other current receivables 514,185 426,865
Other noncurrent receivables 845,460 661,759
Fair Value Purchase And Sale Of Power In The Active Market [member]    
Disclosure of fair value measurement of assets [line items]    
Other receivables 689,531 460,635
Services In Progress [member]    
Disclosure of fair value measurement of assets [line items]    
Other receivables [1] 260,348 228,593
Credits On Sales And Purchases Of Gas [member]    
Disclosure of fair value measurement of assets [line items]    
Other receivables 120,515 142,941
CDE Transfer [member]    
Disclosure of fair value measurement of assets [line items]    
Other receivables 60,433 61,898
Advance Payments To Suppliers [member]    
Disclosure of fair value measurement of assets [line items]    
Other receivables [2] 36,609 24,073
Advance Payments To Employees [member]    
Disclosure of fair value measurement of assets [line items]    
Other receivables 17,785 20,427
Derivatives fair value - forward contract [member]    
Disclosure of fair value measurement of assets [line items]    
Other receivables 23,308
Decommissioning In Progress [member]    
Disclosure of fair value measurement of assets [line items]    
Other receivables 36,855 21,238
Advance For Severance Estate [member]    
Disclosure of fair value measurement of assets [line items]    
Other receivables 14,484 15,597
Tariff Flag [member]    
Disclosure of fair value measurement of assets [line items]    
Other receivables 7,194 19,545
Insurance entities [member]    
Disclosure of fair value measurement of assets [line items]    
Other receivables 24,574
Other receivables [member]    
Disclosure of fair value measurement of assets [line items]    
Other receivables R$ 92,583 R$ 69,103
[1] This item refers to services currently in progress within the Company, most of which are related to the Research and Development and Energy Efficiency programs, which upon conclusion are offset against the respective liability recorded for this purpose.
[2] Advances to suppliers provided on contractual clauses.