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Operating Costs, Expenses and Other Revenue - Schedule of Outsourced Services (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total R$ 1,934 R$ 1,458 R$ 1,052
Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 2,142 1,902 1,706
Meter reading and bill delivery [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 159 161 146
Communication [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 182 169 153
Maintenance and conservation of electrical facilities and equipment [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 799 708 589
Building conservation and cleaning [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 90 85 73
Security services [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 22 20 17
Consultancy [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 19 21 39
Information technology [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 185 174 146
Disconnection and reconnection [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 72 87 90
Legal services and procedural costs [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 38 32 40
Environment services [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 86 58 49
Cleaning of power line pathways [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 154 117 91
Copying and legal publications [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 18 17 18
Inspection of Customers [Member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 48 45 41
Contract Labor Member | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total 49 38 23
Other [member] | Operating Cost [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Total R$ 221 R$ 170 R$ 191