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Assets Classified as Held for Sale - Schedule of Disposal Process (Details)
 12 Months Ended
Dec. 31, 2023
MW
IfrsStatementLineItems [Line Items]  
Installed capacity (MW) 3,601.7
Cemiggt [Member] | C G H Bom Jesus Do Galho [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Registry
Beginning of the operation 1931
Installed capacity (MW) 0.36 [1]
Physical guarantee (MWm) 0.13 [1]
Commercial Operation Status Out of operation
Site Minas Gerais
Cemiggt [Member] | C G H Xicao [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Registry
Beginning of the operation 1942
Installed capacity (MW) 1.81 [1]
Physical guarantee (MWm) 0.61 [1]
Commercial Operation Status In operation
Site Minas Gerais
Cemiggt [Member] | C G H Sumidouro [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Registry
Beginning of the operation 1954
Installed capacity (MW) 2.12 [1]
Physical guarantee (MWm) 0.53 [1]
Commercial Operation Status In operation
Site Minas Gerais
Cemiggt [Member] | P C H Sao Bernardo [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Concession
Beginning of the operation 1948
Installed capacity (MW) 6.82 [1]
Physical guarantee (MWm) 3.42 [1]
Commercial Operation Status In operation
Site Minas Gerais
Cemiggt [Member] | C G H Santa Marta [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Registry
Beginning of the operation 1944
Installed capacity (MW) 1.00 [1]
Physical guarantee (MWm) 0.58 [1]
Commercial Operation Status In operation
Site Minas Gerais
Cemiggt [Member] | C G H Santa Luzia [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Registry
Beginning of the operation 1958
Installed capacity (MW) 0.7 [1]
Physical guarantee (MWm) 0.28 [1]
Commercial Operation Status In operation
Site Minas Gerais
Cemiggt [Member] | C G H Salto Morais [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Registry
Beginning of the operation 1957
Installed capacity (MW) 2.39 [1]
Physical guarantee (MWm) 0.60 [1]
Commercial Operation Status In operation
Site Minas Gerais
Cemiggt [Member] | P C H Riode Pedras [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Concession
Beginning of the operation 1928
Installed capacity (MW) 9.28 [1]
Physical guarantee (MWm) 2.15 [1]
Commercial Operation Status In operation
Site Minas Gerais
Cemiggt [Member] | C G H Pissarrao [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Registry
Beginning of the operation 1925
Installed capacity (MW) 0.80 [1]
Physical guarantee (MWm) 0.55 [1]
Commercial Operation Status In operation
Site Minas Gerais
Cemiggt [Member] | C G H Lages [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Registry
Beginning of the operation 1955
Installed capacity (MW) 0.68 [1]
Physical guarantee (MWm) 0.32 [1]
Commercial Operation Status In operation
Site Minas Gerais
Cemiggt [Member] | C G H Jacutinga [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Registry
Beginning of the operation 1948
Installed capacity (MW) 0.72 [1]
Physical guarantee (MWm) 0.57 [1]
Commercial Operation Status In operation
Site Minas Gerais
Cemiggt [Member] | C G H Anil [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Registry
Beginning of the operation 1964
Installed capacity (MW) 2.06 [1]
Physical guarantee (MWm) 1.10 [1]
Commercial Operation Status In operation
Site Minas Gerais
Horizontes [Member] | C G H Saltodo Paraopeba [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Authorization
Beginning of the operation 1955
Installed capacity (MW) 2.46 [1]
Physical guarantee (MWm) 2.21 [1]
Commercial Operation Status Out of operation
Site Minas Gerais
Horizontes [Member] | C G H Salto Passo Velho [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Authorization
Beginning of the operation 2001
Installed capacity (MW) 1.80 [1]
Physical guarantee (MWm) 1.64 [1]
Commercial Operation Status In operation
Site Santa Catarina
Horizontes [Member] | P C H Salto Voltao [Member]  
IfrsStatementLineItems [Line Items]  
Ledger Authorization
Beginning of the operation 2001
Installed capacity (MW) 8.20 [1]
Physical guarantee (MWm) 7.36 [1]
Commercial Operation Status In operation
Site Santa Catarina
Cemig GT and Horizontes [Member]  
IfrsStatementLineItems [Line Items]  
Installed capacity (MW) 41.20 [1]
Physical guarantee (MWm) 22.05 [1]
[1] Information not audited by the independent auditors.