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Assets Classified as Held for Sale - Schedule of Disposal Process (Details)
 12 Months Ended
Dec. 31, 2024
MW
IfrsStatementLineItems [Line Items]  
Installed capacity (MW) 3,601.7
Cemig GT [Member]  
IfrsStatementLineItems [Line Items]  
Installed capacity (MW) 11.53
Cemig GT [Member]  
IfrsStatementLineItems [Line Items]  
Installed capacity (MW) 14.8
Physical guarantee (MWm) 6
PCH Machado Mineiro [Member] | Cemig GT [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Authorization
Installed capacity (MW) 1.7
Physical guarantee (MWm) 1.1
Term May, 2027
Commercial Operation Status In operation
Site Minas Gerais
UHE Sinceridade [Member] | Cemig Geracao Leste S A [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Concession
Installed capacity (MW) 1.4
Physical guarantee (MWm) 0.4
Term March, 2047
Commercial Operation Status In operation
Site Minas Gerais
UHE Marmelos [Member] | Cemig Geracao Sul S A [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Concession
Installed capacity (MW) 4
Physical guarantee (MWm) 2.7
Term January, 2053
Commercial Operation Status In operation
Site Minas Gerais
UHE Martins [Member] | Cemig Geracao Oeste S A [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Concession
Installed capacity (MW) 7.7
Physical guarantee (MWm) 1.8
Term January, 2053
Commercial Operation Status In operation
Site Minas Gerais