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Operating Costs, Expenses and Other Revenue - Schedule of Operating Costs and Expenses (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]      
Energy purchased for resale R$ 16,695 R$ 14,648 R$ 14,614
Basic network usage charges 3,156 2,937 2,671
Gas purchased for resale 2,127 [1] 2,237 2,735
Total costs of energy and gas 21,978 19,822 20,020
Supply from itaipu binacional [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale 1,204 1,207 1,644
Physical guarantee quota contracts [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale 864 918 925
Quotas for Angra I and II nuclear plants [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale 374 364 357
Spot market [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale 1,154 478 530
Proinfa program [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale 468 511 598
Bilateral contracts [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale 499 510 493
Energy acquired in regulated market auctions [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale 4,564 3,940 3,334
Energy acquired in the free market [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale 5,655 5,612 6,003
Distributed generation ('geracao distribuida') [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale 3,239 2,331 1,977
PIS/pasep and cofins credits [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Energy purchased for resale 1,326 1,223 1,247
Basic network usage charges (369) (337) (304)
Transmission Charges Basic Grid [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Basic network usage charges 3,466 54 2,925
Distribution Charges [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Basic network usage charges R$ 59 R$ 3,220 R$ 50
[1] The price of the gas molecule acquired by Gasmig is corrected for the variation in Brent-type oil and the variation in the exchange rate.