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SUBSEQUENT EVENTS (Details)
 12 Months Ended
Dec. 31, 2022
MW
IfrsStatementLineItems [Line Items]  
Installed capacity (MW) 3,601
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
Physical guarantee (MWm) 0.13
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
Physical guarantee (MWm) 0.61
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
Physical guarantee (MWm) 0.53
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
Physical guarantee (MWm) 3.42
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
Physical guarantee (MWm) 0.58
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) 0.70
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
Physical guarantee (MWm) 0.60
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
Physical guarantee (MWm) 2.15
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
Physical guarantee (MWm) 0.55
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
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
Physical guarantee (MWm) 0.57
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
Physical guarantee (MWm) 1.10
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
Physical guarantee (MWm) 2.21
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
Physical guarantee (MWm) 1.64
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
Physical guarantee (MWm) 7.36
Commercial Operation Status In operation
Site Santa Catarina