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Operating Costs, Expenses and Other Revenue - Additional Information (Details)
R$ in Millions
 1 Months Ended 12 Months Ended
Aug. 07, 2024
BRL (R$)
Mar. 08, 2024
BRL (R$)
May 31, 2024
employees
Dec. 31, 2024
BRL (R$)
GWh
facilities
Dec. 31, 2023
BRL (R$)
GWh
facilities
Dec. 31, 2022
BRL (R$)
Disclosure of defined benefit plans [line items]            
Number of generating facilities | facilities       301,804 249,241  
Amount of energy injected | GWh       6,108 4,720  
Impairment       R$ 46
Personnel       1,399 1,308 1,352
Advantageous purchase       5
PIS/Pasep and Cofins taxes       5 [1] 76  
Results of the Periodic Tariff Review       1,676    
Other Operating Expenses (Revenue) [Member]            
Disclosure of defined benefit plans [line items]            
Impairment loss recognised in profit or loss       5    
Alianca norte [member]            
Disclosure of defined benefit plans [line items]            
Impairment       41    
C E M I G Sim [Member]            
Disclosure of defined benefit plans [line items]            
Advantageous purchase       R$ 14 [2] R$ 5
Equity interest rate       51.00%    
P D V P 2024 [Member]            
Disclosure of defined benefit plans [line items]            
Number of employees completing severance | employees     357      
Personnel       R$ 78    
UFV Jequitiba II [member]            
Disclosure of defined benefit plans [line items]            
Advantageous purchase   R$ 10   10    
UFV Jequitiba I [member]            
Disclosure of defined benefit plans [line items]            
Advantageous purchase R$ 4     R$ 4    
[1]

This refers to escrow deposits in the action challenging the constitutionality of inclusion of ICMS tax within the amount to which PIS/Pasep and Cofins taxes are applied. In December 2024, Gasmig was able to recover the escrow deposits that had been paid into court for these actions, in the updated amount of R$76.
[2]

This amount is made up of advantageous purchases arising from acquisitions made by Cemig SIM, of which R$10 refers to the acquisition of UFV Jequitibá II and R$4 refers to the acquisition of Jequitibá I. For more details see Note 14.