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1 Operations (Details Narrative)
R$ in Thousands
 12 Months Ended
Mar. 02, 2021
BRL (R$)
Plant
Dec. 23, 2020
BRL (R$)
May 18, 2020
May 01, 2020
Apr. 08, 2020
BRL (R$)
Dec. 31, 2020
BRL (R$)
Dec. 31, 2019
BRL (R$)
Dec. 10, 2020
BRL (R$)
Jun. 25, 2020
BRL (R$)
May 13, 2020
BRL (R$)
Dec. 31, 2018
BRL (R$)
Disclosure of joint ventures [line items]                      
Description of electric energy demand           The industrial and commercial consumption classes, which registered a decrease of 12.6% and 11.8% in the year, respectively, in relation to the previous year.          
Percentage of growth in residential class           5.50%          
Sector financial liabilities         R$ 84,881         R$ 8,666  
Total amount requised of provisions                 R$ 869,516    
Advance amount                 R$ 536,359    
Estimated expected credit losses           R$ 35,800          
Percentage of drop in consumation capative energy market           3.10%          
Percentage of over-contracting electricity           105.50%          
Deferred tax assets           R$ 1,191,104 R$ 1,011,866       R$ 1,007,061
Net working capital           1,753,039 2,563,575        
Cash and cash equivalents           R$ 3,222,768 R$ 2,941,727        
Amount received for sale of assets   R$ 1,536                  
Amount of renegotiation of hydrological risk R$ 1,366,343                    
Description consumers with consumption     Decree 10,350 was enacted, which provided for the creation of the Covid Account, intended for the electric sector to deal with the state of public calamity recognized by Legislative Decree 6, of March 20, 2020, and which regulated the Provisional Measure 950 valid until 05.08.2020.   for low-income consumers with consumption of up to 220 kWh/month, for a period of three months for low-income consumers with consumption of up to 220 kWh/month, for a period of three months          
Description provisional Measure         valid until 05.08.2020, Provisional Measure 950 was enacted by the Federal Government            
Number of eligible plants | Plant 15                    
Description commercial operation began       commercial operation began with 3 MWp (megawatt-peak, photovoltaic power unit) out of a total of 5.36 MWp of installed power, enough to already serve the energy consumption of approximately 2,500 homes.              
Domino Holdings Ltda [member]                      
Disclosure of joint ventures [line items]                      
Amount transferred to other receivables               R$ 153      
Commercial and industrial classes [member] | Bottom Of Range [member]                      
Disclosure of joint ventures [line items]                      
Percentage of reduced consumption           11.80%          
Commercial and industrial classes [member] | Top Of Range [member]                      
Disclosure of joint ventures [line items]                      
Percentage of reduced consumption           12.60%