0001157557
false
2021
FY
--12-31
D5
International Financial Reporting Standards
807
401
116
944
12,953
11,810
11,810
12,953
11,810
12,953
Jan 15, 2046
P7Y
Jan 03, 2053
Jan 15, 2046
P7Y
Jan 03, 2053
Jul 03, 2046
P4Y
Jul 19, 2050
Jul 03, 2046
P9M18D
Apr 19, 2047
Jul 03, 2046
P9M18D
Apr 19, 2047
Jan 05, 2046
P7Y
Jan 03, 2053
Jul 03, 2046
P8M12D
Mar 12, 2047
Jan 05, 2046
P1Y
Dec 26, 2046
Jan 05, 2046
P7Y
Jan 03, 2053
Jan 05, 2046
P7Y
Jan 03, 2053
Jul 03, 2046
P9M18D
Apr 11, 2047
Jan 05, 2046
P7Y
Jan 03, 2053
Jan 05, 2046
P7Y
Jan 03, 2053
Jan 05, 2046
P7Y
Jan 03, 2053
Jan 05, 2046
P7Y
Jan 03, 2053
Jan 05, 2046
P7Y
Jan 03, 2053
May 29, 2045
P7Y
May 27, 2052
Apr 04, 2032
P4M24D
Sep 14, 2032
Jul 08, 2025
P1Y10M25D
May 21, 2027
May 08, 2032
P3Y7M6D
Dec 12, 2035
Dec 01, 2024
P1Y8M12D
Aug 27, 2026
Jul 23, 2025
P2Y1M6D
Aug 11, 2027
Feb 28, 2035
P2Y7M6D
Sep 18, 2037
Dec 18, 2032
P1Y9M18D
Jun 26, 2034
Aug 19, 2025
P1Y10M25D
Jun 27, 2027
Jul 23, 2025
P1Y9M18D
May 26, 2027
P10Y0M15D
P12Y10M10D
P14Y5M9D
P15Y5M20D
0001157557
2021-01-01
2021-12-31
0001157557
dei:BusinessContactMember
2021-01-01
2021-12-31
0001157557
cig:CommonSharesMember
2021-12-31
0001157557
cig:PreferredSharesMember
2021-12-31
0001157557
2020-01-01
2020-12-31
0001157557
2021-12-31
0001157557
2020-12-31
0001157557
2019-01-01
2019-12-31
0001157557
cig:ShareCapitalMember
2020-12-31
0001157557
ifrs-full:CapitalReserveMember
2020-12-31
0001157557
cig:ProfitsReservesMember
2020-12-31
0001157557
cig:EquityValuationAdjustmentsMember
2020-12-31
0001157557
ifrs-full:RetainedEarningsMember
2020-12-31
0001157557
cig:TotalMember
2020-12-31
0001157557
ifrs-full:NoncontrollingInterestsMember
2020-12-31
0001157557
cig:ShareCapitalMember
2019-12-31
0001157557
ifrs-full:CapitalReserveMember
2019-12-31
0001157557
cig:ProfitsReservesMember
2019-12-31
0001157557
cig:EquityValuationAdjustmentsMember
2019-12-31
0001157557
ifrs-full:RetainedEarningsMember
2019-12-31
0001157557
cig:TotalMember
2019-12-31
0001157557
ifrs-full:NoncontrollingInterestsMember
2019-12-31
0001157557
2019-12-31
0001157557
cig:ShareCapitalMember
2018-12-31
0001157557
ifrs-full:CapitalReserveMember
2018-12-31
0001157557
cig:ProfitsReservesMember
2018-12-31
0001157557
cig:EquityValuationAdjustmentsMember
2018-12-31
0001157557
ifrs-full:RetainedEarningsMember
2018-12-31
0001157557
cig:TotalMember
2018-12-31
0001157557
ifrs-full:NoncontrollingInterestsMember
2018-12-31
0001157557
2018-12-31
0001157557
cig:ShareCapitalMember
2021-01-01
2021-12-31
0001157557
ifrs-full:CapitalReserveMember
2021-01-01
2021-12-31
0001157557
cig:ProfitsReservesMember
2021-01-01
2021-12-31
0001157557
cig:EquityValuationAdjustmentsMember
2021-01-01
2021-12-31
0001157557
ifrs-full:RetainedEarningsMember
2021-01-01
2021-12-31
0001157557
cig:TotalMember
2021-01-01
2021-12-31
0001157557
ifrs-full:NoncontrollingInterestsMember
2021-01-01
2021-12-31
0001157557
cig:ShareCapitalMember
2020-01-01
2020-12-31
0001157557
ifrs-full:CapitalReserveMember
2020-01-01
2020-12-31
0001157557
cig:ProfitsReservesMember
2020-01-01
2020-12-31
0001157557
cig:EquityValuationAdjustmentsMember
2020-01-01
2020-12-31
0001157557
ifrs-full:RetainedEarningsMember
2020-01-01
2020-12-31
0001157557
cig:TotalMember
2020-01-01
2020-12-31
0001157557
ifrs-full:NoncontrollingInterestsMember
2020-01-01
2020-12-31
0001157557
cig:ShareCapitalMember
2019-01-01
2019-12-31
0001157557
ifrs-full:CapitalReserveMember
2019-01-01
2019-12-31
0001157557
cig:ProfitsReservesMember
2019-01-01
2019-12-31
0001157557
cig:EquityValuationAdjustmentsMember
2019-01-01
2019-12-31
0001157557
ifrs-full:RetainedEarningsMember
2019-01-01
2019-12-31
0001157557
cig:TotalMember
2019-01-01
2019-12-31
0001157557
ifrs-full:NoncontrollingInterestsMember
2019-01-01
2019-12-31
0001157557
cig:ShareCapitalMember
2021-12-31
0001157557
ifrs-full:CapitalReserveMember
2021-12-31
0001157557
cig:ProfitsReservesMember
2021-12-31
0001157557
cig:EquityValuationAdjustmentsMember
2021-12-31
0001157557
ifrs-full:RetainedEarningsMember
2021-12-31
0001157557
cig:TotalMember
2021-12-31
0001157557
ifrs-full:NoncontrollingInterestsMember
2021-12-31
0001157557
cig:CemigGeracaoeTransmissaoSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigBaguariMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoTresMariasSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoSaltoGrandesSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoItutingaSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoCamargosSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoSulSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoLesteSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoOesteSAMember
2021-01-01
2021-12-31
0001157557
cig:RosalEnergiaSAMember
2021-01-01
2021-12-31
0001157557
cig:SaCarvalhoSAMember
2021-01-01
2021-12-31
0001157557
cig:HorizontesEnergiaSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigPCHSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigTradingSAMember
2021-01-01
2021-12-31
0001157557
cig:EmpresadeServicoseComercializacaodeEnergiaEletricaSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoPocoFundoMember
2021-01-01
2021-12-31
0001157557
cig:CentralEolicaPraiasdeParajuruSAMember
2021-01-01
2021-12-31
0001157557
cig:CentralEolicaVoltadoRioSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigDistribuicaoSAMember
2021-01-01
2021-12-31
0001157557
cig:CompanhiadeGasdeMinasGeraisMember
2021-01-01
2021-12-31
0001157557
cig:EfficientiaSAMember
2021-01-01
2021-12-31
0001157557
cig:CompanhiaDeTransmissaoCentroesteDeMinasCentroesteMember
2021-01-01
2021-12-31
0001157557
cig:SeteLagoasTransmissoraDeEnergiaSAMember
2021-01-01
2021-12-31
0001157557
cig:GuanhaesEnergiaSAMember
2021-01-01
2021-12-31
0001157557
cig:LightGerSAMember
2021-01-01
2021-12-31
0001157557
cig:UsinaHidreletricaItaocaraSAMember
2021-01-01
2021-12-31
0001157557
cig:AxxiomSolucoesTecnologicasSAMember
2021-01-01
2021-12-31
0001157557
cig:HidreletricaCachoeiraoSAMember
2021-01-01
2021-12-31
0001157557
cig:HidreletricaPipocaSAMember
2021-01-01
2021-12-31
0001157557
cig:RetiroBaixoEnergeticaSAMember
2021-01-01
2021-12-31
0001157557
cig:AmazoniaEnergiaParticipacoesSAMember
2021-01-01
2021-12-31
0001157557
cig:AliancaNorteEnergiaParticipacoesSAMember
2021-01-01
2021-12-31
0001157557
cig:BaguariEnergiaSAMember
2021-01-01
2021-12-31
0001157557
cig:AliancaGeracaodeEnergiaSAMember
2021-01-01
2021-12-31
0001157557
cig:TransmissoraAliancadeEnergiaEletricaSAMember
2021-01-01
2021-12-31
0001157557
cig:UFV1Member
2021-01-01
2021-12-31
0001157557
cig:UFV2Member
2021-01-01
2021-12-31
0001157557
cig:UFV3Member
2021-01-01
2021-12-31
0001157557
cig:UFV4Member
2021-01-01
2021-12-31
0001157557
cig:UFV5Member
2021-01-01
2021-12-31
0001157557
cig:UFV6Member
2021-01-01
2021-12-31
0001157557
cig:UFV7Member
2021-01-01
2021-12-31
0001157557
cig:UFV8Member
2021-01-01
2021-12-31
0001157557
cig:UFV9Member
2021-01-01
2021-12-31
0001157557
cig:UFV10Member
2021-01-01
2021-12-31
0001157557
cig:UFV11Member
2021-01-01
2021-12-31
0001157557
cig:UFV12Member
2021-01-01
2021-12-31
0001157557
cig:UFV13Member
2021-01-01
2021-12-31
0001157557
cig:UFV14Member
2021-01-01
2021-12-31
0001157557
cig:UFV15Member
2021-01-01
2021-12-31
0001157557
cig:UFVMember
2021-01-01
2021-12-31
0001157557
cig:MadeiraEnergiaSAMember
2021-01-01
2021-12-31
0001157557
cig:AtivasDatacenterSAMember
2021-01-01
2021-12-31
0001157557
cig:FipMelbourneMember
2021-01-01
2021-12-31
0001157557
cig:RenovaEnergiaSAMember
2021-01-01
2021-12-31
0001157557
2021-12-22
2021-12-23
0001157557
2021-11-29
2021-11-30
0001157557
2021-08-05
0001157557
2021-08-04
2021-08-05
0001157557
cig:EmborcacaoHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:NovaPonteHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:SantaLuziaHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:SaCarvalhoHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:RosalHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:MachadoMineiroHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:SaltoVoltaoHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:SaltoParaopebaHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:SaltoDoPassoVelhoHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:PchPaiJoaquimHydroElectricPlantsMemberMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:IrapeHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:QueimadoConsortiumMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:RioDePedrasHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:PocoFundoHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:SaoBernardoHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:TresMariasHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:SaltoGrandeHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:ItutingaHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:CamargosHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:CoronelDomicianoJoasalMarmelosPacienciaEPiauHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:DonaRitaErvaliaNeblinaPetiSinceridadeAndTronqueirasHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:CajuruGafanhotoAndMartinsHydroelectricPlantsMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:CentralGeradoraElicaPraiasDeParajuruWindPowerPlantsMember
2021-01-01
2021-12-31
0001157557
cig:CentralGeradoraElicaVoltaDoRioWindPowerPlantsMember
2021-01-01
2021-12-31
0001157557
cig:NationalGridMember
2021-01-01
2021-12-31
0001157557
cig:SubstationSeItajubMember
2021-01-01
2021-12-31
0001157557
cig:FurnasPimentaTransmissionLineMember
cig:NationalElectricalEnergyAgencyMember
2021-01-01
2021-12-31
0001157557
cig:EnergyDistributionMember
2021-01-01
2021-12-31
0001157557
ifrs-full:GasDistributionMember
2021-01-01
2021-12-31
0001157557
cig:IrapeEnterpriseMember
2021-12-31
0001157557
cig:IrapeEnterpriseMember
2021-01-01
2021-12-31
0001157557
cig:QueimadaoConsortiumEnterpriseMember
2021-12-31
0001157557
cig:QueimadaoConsortiumEnterpriseMember
2021-01-01
2021-12-31
0001157557
cig:CemigDistributionMember
2021-01-01
2021-12-31
0001157557
cig:TwoThousandAndNineteenMember
2021-01-01
2021-12-31
0001157557
cig:TwoThousandTwentyMember
2021-01-01
2021-12-31
0001157557
2019-09-01
2019-09-19
0001157557
ifrs-full:OperatingSegmentsMember
cig:TransmissionSegmentMember
2021-01-01
2021-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:TrandingSegmentMember
2021-01-01
2021-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:DistributionSegmentMember
2021-01-01
2021-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:OtherSegmentsMember
2021-01-01
2021-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:InvesteesSegmentsMember
2021-01-01
2021-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:TotalSegmentsMember
2021-01-01
2021-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:IntersegmentTransactionsSegmentsMember
2021-01-01
2021-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:ReconciliationSegmentsMember
2021-01-01
2021-12-31
0001157557
ifrs-full:OperatingSegmentsMember
ifrs-full:AllOtherSegmentsMember
2021-01-01
2021-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:TransmissionSegmentMember
2020-01-01
2020-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:TrandingSegmentMember
2020-01-01
2020-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:DistributionSegmentMember
2020-01-01
2020-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:OtherSegmentsMember
2020-01-01
2020-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:InvesteesSegmentsMember
2020-01-01
2020-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:TotalSegmentsMember
2020-01-01
2020-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:IntersegmentTransactionsSegmentsMember
2020-01-01
2020-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:ReconciliationSegmentsMember
2020-01-01
2020-12-31
0001157557
ifrs-full:OperatingSegmentsMember
ifrs-full:AllOtherSegmentsMember
2020-01-01
2020-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:TransmissionSegmentMember
2019-01-01
2019-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:TrandingSegmentMember
2019-01-01
2019-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:DistributionSegmentMember
2019-01-01
2019-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:OtherSegmentsMember
2019-01-01
2019-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:InvesteesSegmentsMember
2019-01-01
2019-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:TotalSegmentsMember
2019-01-01
2019-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:IntersegmentTransactionsSegmentsMember
2019-01-01
2019-12-31
0001157557
ifrs-full:OperatingSegmentsMember
cig:ReconciliationSegmentsMember
2019-01-01
2019-12-31
0001157557
ifrs-full:OperatingSegmentsMember
ifrs-full:AllOtherSegmentsMember
2019-01-01
2019-12-31
0001157557
cig:BankCertificateOfDepositCDBMember
2021-12-31
0001157557
cig:BankCertificateOfDepositCDBMember
2020-12-31
0001157557
cig:FinancialNotesBanksMember
2021-12-31
0001157557
cig:FinancialNotesBanksMember
2020-12-31
0001157557
cig:TreasuryFinancialNotesMember
2021-12-31
0001157557
cig:TreasuryFinancialNotesMember
2020-12-31
0001157557
cig:OtherInvestmentMember
2021-12-31
0001157557
cig:OtherInvestmentMember
2020-12-31
0001157557
cig:DebenturesMember
2021-12-31
0001157557
cig:DebenturesMember
2020-12-31
0001157557
cig:BalanceNotYetDueMember
2021-12-31
0001157557
ifrs-full:LaterThanOneMonthAndNotLaterThanThreeMonthsMember
2021-12-31
0001157557
ifrs-full:LaterThanThreeMonthsAndNotLaterThanOneYearMember
2021-12-31
0001157557
ifrs-full:LaterThanOneYearMember
2021-12-31
0001157557
cig:ResidentialMember
2021-12-31
0001157557
cig:ResidentialMember
2020-12-31
0001157557
cig:IndustrialMember
2021-12-31
0001157557
cig:IndustrialMember
2020-12-31
0001157557
cig:CommercialServicesAndOtherMember
2021-12-31
0001157557
cig:CommercialServicesAndOtherMember
2020-12-31
0001157557
cig:RuralMember
2021-12-31
0001157557
cig:RuralMember
2020-12-31
0001157557
cig:PublicAuthoritiesMember
2021-12-31
0001157557
cig:PublicAuthoritiesMember
2020-12-31
0001157557
cig:PublicLightingMember
2021-12-31
0001157557
cig:PublicLightingMember
2020-12-31
0001157557
cig:PublicServiceMember
2021-12-31
0001157557
cig:PublicServiceMember
2020-12-31
0001157557
cig:NetworkFeesMember
2021-12-31
0001157557
cig:NetworkFeesMember
2020-12-31
0001157557
cig:EletrobrasMember
2018-12-31
0001157557
cig:EletrobrasMember
2019-01-01
2019-12-31
0001157557
cig:EletrobrasMember
2019-12-31
0001157557
cig:EletrobrasMember
2020-01-01
2020-12-31
0001157557
cig:EletrobrasMember
2020-12-31
0001157557
cig:EletrobrasMember
2021-01-01
2021-12-31
0001157557
cig:EletrobrasMember
2021-12-31
0001157557
cig:ICMSVATMember
2021-12-31
0001157557
cig:ICMSVATMember
2020-12-31
0001157557
cig:PISAndPaseptaxesMember
2021-12-31
0001157557
cig:PISAndPaseptaxesMember
2020-12-31
0001157557
cig:CofinsTaxMember
2021-12-31
0001157557
cig:CofinsTaxMember
2020-12-31
0001157557
cig:OtherTaxRecoverableMember
2021-12-31
0001157557
cig:OtherTaxRecoverableMember
2020-12-31
0001157557
cig:PISAndPaseptaxesAndCofinsMember
2021-05-11
2021-05-13
0001157557
cig:PISAndPaseptaxesAndCofinsMember
2021-01-01
2021-12-31
0001157557
cig:PISAndPaseptaxesAndCofinsMember
2021-12-31
0001157557
cig:PISAndPaseptaxesAndCofinsMember
2020-12-31
0001157557
cig:TaxLossCarryforwardMember
2021-12-31
0001157557
cig:TaxLossCarryforwardMember
2020-12-31
0001157557
cig:TaxLossCarryforwardMember
2019-12-31
0001157557
cig:ProvisionsForContingenciesMember
2021-12-31
0001157557
cig:ProvisionsForContingenciesMember
2020-12-31
0001157557
cig:ProvisionsForContingenciesMember
2019-12-31
0001157557
cig:ImpairmentOnInvestmentsMember
2021-12-31
0001157557
cig:ImpairmentOnInvestmentsMember
2020-12-31
0001157557
cig:ImpairmentOnInvestmentsMember
2019-12-31
0001157557
cig:ProvisionPUTSAAGMember
2021-12-31
0001157557
cig:ProvisionPUTSAAGMember
2020-12-31
0001157557
cig:ProvisionPUTSAAGMember
2019-12-31
0001157557
cig:PostEmploymentObligationsMember
2021-12-31
0001157557
cig:PostEmploymentObligationsMember
2020-12-31
0001157557
cig:PostEmploymentObligationsMember
2019-12-31
0001157557
cig:ProvisionForDoubtfulTradeReceivableMember
2021-12-31
0001157557
cig:ProvisionForDoubtfulTradeReceivableMember
2020-12-31
0001157557
cig:ProvisionForDoubtfulTradeReceivableMember
2019-12-31
0001157557
cig:OtherDeferredIncomeAndSocialContributionTaxesAssetsMember
2021-12-31
0001157557
cig:OtherDeferredIncomeAndSocialContributionTaxesAssetsMember
2020-12-31
0001157557
cig:OtherDeferredIncomeAndSocialContributionTaxesAssetsMember
2019-12-31
0001157557
cig:DeemedCostMember
2021-01-01
2021-12-31
0001157557
cig:DeemedCostMember
2020-01-01
2020-12-31
0001157557
cig:DeemedCostMember
2019-01-01
2019-12-31
0001157557
cig:CostOfAcquisitionOfEquityInterestsMember
2021-01-01
2021-12-31
0001157557
cig:CostOfAcquisitionOfEquityInterestsMember
2020-01-01
2020-12-31
0001157557
cig:CostOfAcquisitionOfEquityInterestsMember
2019-01-01
2019-12-31
0001157557
cig:BorrowingCostsCapitalizedMember
2021-01-01
2021-12-31
0001157557
cig:BorrowingCostsCapitalizedMember
2020-01-01
2020-12-31
0001157557
cig:BorrowingCostsCapitalizedMember
2019-01-01
2019-12-31
0001157557
cig:AdjustmentOfExpectationOfCashFlowConcessionAssetsMember
2021-01-01
2021-12-31
0001157557
cig:AdjustmentOfExpectationOfCashFlowConcessionAssetsMember
2020-01-01
2020-12-31
0001157557
cig:AdjustmentOfExpectationOfCashFlowConcessionAssetsMember
2019-01-01
2019-12-31
0001157557
cig:RevenuesArisingFromTransmissionContractAssetMember
2021-01-01
2021-12-31
0001157557
cig:RevenuesArisingFromTransmissionContractAssetMember
2020-01-01
2020-12-31
0001157557
cig:RevenuesArisingFromTransmissionContractAssetMember
2019-01-01
2019-12-31
0001157557
cig:AdjustmentToFairValueSwapGainsMember
2021-01-01
2021-12-31
0001157557
cig:AdjustmentToFairValueSwapGainsMember
2020-01-01
2020-12-31
0001157557
cig:AdjustmentToFairValueSwapGainsMember
2019-01-01
2019-12-31
0001157557
cig:UpdatingOnEscrowDepositsMember
2021-01-01
2021-12-31
0001157557
cig:UpdatingOnEscrowDepositsMember
2020-01-01
2020-12-31
0001157557
cig:UpdatingOnEscrowDepositsMember
2019-01-01
2019-12-31
0001157557
cig:ReimbursementOfCostsGSFMember
2021-01-01
2021-12-31
0001157557
cig:OtherDeferredIncomeAndSocialContributionTaxesAssetsMember
2021-01-01
2021-12-31
0001157557
cig:OtherDeferredIncomeAndSocialContributionTaxesAssetsMember
2020-01-01
2020-12-31
0001157557
cig:OtherDeferredIncomeAndSocialContributionTaxesAssetsMember
2019-01-01
2019-12-31
0001157557
ifrs-full:NotLaterThanOneYearMember
2021-12-31
0001157557
cig:LaterThanOneYearsAndNotLaterThanTwoYearsMember
2021-12-31
0001157557
ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
2021-12-31
0001157557
ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember
2021-12-31
0001157557
ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember
2021-12-31
0001157557
cig:LaterThanFiveYearsAndNotLaterThanEightYearsMember
2021-12-31
0001157557
cig:LaterThanEightYearsAndNotLaterThanTenYearsMember
2021-12-31
0001157557
cig:CemigDMember
2021-12-31
0001157557
cig:CemigDMember
2020-12-31
0001157557
cig:CemigDMember
2019-12-31
0001157557
cig:CemingGTMember
2021-12-31
0001157557
cig:CemingGTMember
2020-12-31
0001157557
cig:DistributionsConcessionsMember
cig:AssetsRelatedToInfrastuctureMember
2021-12-31
0001157557
cig:DistributionsConcessionsMember
cig:AssetsRelatedToInfrastuctureMember
2020-12-31
0001157557
cig:GasConcessionsMember
cig:AssetsRelatedToInfrastuctureMember
2021-12-31
0001157557
cig:GasConcessionsMember
cig:AssetsRelatedToInfrastuctureMember
2020-12-31
0001157557
cig:GenerationReceivableMember
cig:AssetsRelatedToInfrastuctureMember
2021-12-31
0001157557
cig:GenerationReceivableMember
cig:AssetsRelatedToInfrastuctureMember
2020-12-31
0001157557
cig:ConcessionGrantFeeMember
cig:AssetsRelatedToInfrastuctureMember
2021-12-31
0001157557
cig:ConcessionGrantFeeMember
cig:AssetsRelatedToInfrastuctureMember
2020-12-31
0001157557
cig:AssetsRelatedToInfrastuctureMember
2021-12-31
0001157557
cig:AssetsRelatedToInfrastuctureMember
2020-12-31
0001157557
cig:CVAAndOtherFinancialComponentsInTariffAdjustmentsMember
cig:AssetsRelatedToInfrastuctureMember
2021-12-31
0001157557
cig:CVAAndOtherFinancialComponentsInTariffAdjustmentsMember
cig:AssetsRelatedToInfrastuctureMember
2020-12-31
0001157557
cig:CVAAndOtherFinancialComponentsInTariffAdjustmentsMember
cig:LiabilitiesRelatedToInfrastuctureMember
2021-12-31
0001157557
cig:CVAAndOtherFinancialComponentsInTariffAdjustmentsMember
cig:LiabilitiesRelatedToInfrastuctureMember
2020-12-31
0001157557
cig:LiabilitiesRelatedToInfrastuctureMember
2021-12-31
0001157557
cig:LiabilitiesRelatedToInfrastuctureMember
2020-12-31
0001157557
cig:InfrastructureMember
cig:GenerationMember
2018-12-31
0001157557
cig:InfrastructureMember
cig:DistributionMember
2018-12-31
0001157557
cig:InfrastructureMember
cig:GasMember
2018-12-31
0001157557
cig:InfrastructureMember
2018-12-31
0001157557
cig:InfrastructureMember
cig:GenerationMember
cig:Restated1Member
2019-01-01
2019-12-31
0001157557
cig:InfrastructureMember
cig:Restated1Member
2019-01-01
2019-12-31
0001157557
cig:InfrastructureMember
cig:DistributionMember
2019-12-31
0001157557
cig:InfrastructureMember
2019-12-31
0001157557
cig:InfrastructureMember
cig:GasMember
2019-12-31
0001157557
cig:InfrastructureMember
cig:GenerationMember
2019-12-31
0001157557
cig:InfrastructureMember
cig:GenerationMember
cig:Restated1Member
2020-01-01
2020-12-31
0001157557
cig:InfrastructureMember
cig:Restated1Member
2020-01-01
2020-12-31
0001157557
cig:InfrastructureMember
cig:DistributionMember
2020-12-31
0001157557
cig:InfrastructureMember
2020-12-31
0001157557
cig:InfrastructureMember
cig:GenerationMember
2020-12-31
0001157557
cig:InfrastructureMember
cig:GasMember
2020-12-31
0001157557
cig:InfrastructureMember
cig:GenerationMember
cig:Restated1Member
2021-01-01
2021-12-31
0001157557
cig:DistributionMember
cig:GenerationMember
cig:Restated1Member
2021-01-01
2021-12-31
0001157557
cig:GasMember
cig:GenerationMember
cig:Restated1Member
2021-01-01
2021-12-31
0001157557
cig:InfrastructureMember
cig:Restated1Member
2021-01-01
2021-12-31
0001157557
cig:InfrastructureMember
cig:DistributionMember
2021-12-31
0001157557
cig:InfrastructureMember
2021-12-31
0001157557
cig:InfrastructureMember
cig:GenerationMember
2021-12-31
0001157557
cig:InfrastructureMember
cig:GasMember
2021-12-31
0001157557
cig:UsinaHidreletricaJaguaraMember
2021-12-31
0001157557
cig:UsinaHidreletricaSaoSimaoMember
2021-12-31
0001157557
cig:UsinaHidreletricaMirandaMember
2021-12-31
0001157557
cig:UsinaHidreletricaTresMariasMember
2021-01-01
2021-12-31
0001157557
cig:UsinaHidreletricaTresMariasMember
2021-12-31
0001157557
cig:UsinaHidreletricaSaltoGrandeMember
2021-01-01
2021-12-31
0001157557
cig:UsinaHidreletricaSaltoGrandeMember
2021-12-31
0001157557
cig:UsinaHidreletricaItutingaMember
2021-01-01
2021-12-31
0001157557
cig:UsinaHidreletricaItutingaMember
2021-12-31
0001157557
cig:UsinaHidreletricaCamargosMember
2021-01-01
2021-12-31
0001157557
cig:UsinaHidreletricaCamargosMember
2021-12-31
0001157557
cig:CemigPCHPiauMember
2021-01-01
2021-12-31
0001157557
cig:CemigPCHPiauMember
2021-12-31
0001157557
cig:CemigPCHGafanhotoMember
2021-01-01
2021-12-31
0001157557
cig:CemigPCHGafanhotoMember
2021-12-31
0001157557
cig:CemigPCHPetiMember
2021-01-01
2021-12-31
0001157557
cig:CemigPCHPetiMember
2021-12-31
0001157557
cig:CemigPCHDonaRitaMember
2021-01-01
2021-12-31
0001157557
cig:CemigPCHDonaRitaMember
2021-12-31
0001157557
cig:CemigPCHTronqueirasMember
2021-01-01
2021-12-31
0001157557
cig:CemigPCHTronqueirasMember
2021-12-31
0001157557
cig:CemigPCHJoasalMember
2021-01-01
2021-12-31
0001157557
cig:CemigPCHJoasalMember
2021-12-31
0001157557
cig:CemigPCHMartinsMember
2021-01-01
2021-12-31
0001157557
cig:CemigPCHMartinsMember
2021-12-31
0001157557
cig:CemigPCHCajuruMember
2021-01-01
2021-12-31
0001157557
cig:CemigPCHCajuruMember
2021-12-31
0001157557
cig:CemigPCHPacienciaMember
2021-01-01
2021-12-31
0001157557
cig:CemigPCHPacienciaMember
2021-12-31
0001157557
cig:CemigPCHMarmelosMember
2021-01-01
2021-12-31
0001157557
cig:CemigPCHMarmelosMember
2021-12-31
0001157557
cig:UsinaHidreletricaVoltaGrandeMember
2021-01-01
2021-12-31
0001157557
cig:UsinaHidreletricaVoltaGrandeMember
2021-12-31
0001157557
cig:UsinaHidreletricaMirandaMember
2021-01-01
2021-12-31
0001157557
cig:UsinaHidreletricaJaguaraMember
2021-01-01
2021-12-31
0001157557
cig:UsinaHidreletricaSaoSimaoMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoTresMariasSAMember
2020-12-31
0001157557
cig:CemigGeracaoTresMariasSAMember
2021-12-31
0001157557
cig:CemigGeracaoTresMariasSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoSaltoGrandeSAMember
2020-12-31
0001157557
cig:CemigGeracaoSaltoGrandeSAMember
2021-12-31
0001157557
cig:CemigGeracaoSaltoGrandeSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoItutingaSAMember
2020-12-31
0001157557
cig:CemigGeracaoItutingaSAMember
2021-12-31
0001157557
cig:CemigGeracaoItutingaSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoCamargosSAMember
2020-12-31
0001157557
cig:CemigGeracaoCamargosSAMember
2021-12-31
0001157557
cig:CemigGeracaoCamargosSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoSulSAMember
2020-12-31
0001157557
cig:CemigGeracaoSulSAMember
2021-12-31
0001157557
cig:CemigGeracaoSulSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoLesteSAMember
2020-12-31
0001157557
cig:CemigGeracaoLesteSAMember
2021-12-31
0001157557
cig:CemigGeracaoLesteSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoOesteSAMember
2020-12-31
0001157557
cig:CemigGeracaoOesteSAMember
2021-12-31
0001157557
cig:CemigGeracaoOesteSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoTresMariasSAMember
2019-12-31
0001157557
cig:CemigGeracaoTresMariasSAMember
2020-01-01
2020-12-31
0001157557
cig:CemigGeracaoSaltoGrandeSAMember
2019-12-31
0001157557
cig:CemigGeracaoSaltoGrandeSAMember
2020-01-01
2020-12-31
0001157557
cig:CemigGeracaoItutingaSAMember
2019-12-31
0001157557
cig:CemigGeracaoItutingaSAMember
2020-01-01
2020-12-31
0001157557
cig:CemigGeracaoCamargosSAMember
2019-12-31
0001157557
cig:CemigGeracaoCamargosSAMember
2020-01-01
2020-12-31
0001157557
cig:CemigGeracaoSulSAMember
2019-12-31
0001157557
cig:CemigGeracaoSulSAMember
2020-01-01
2020-12-31
0001157557
cig:CemigGeracaoLesteSAMember
2019-12-31
0001157557
cig:CemigGeracaoLesteSAMember
2020-01-01
2020-12-31
0001157557
cig:CemigGeracaoOesteSAMember
2019-12-31
0001157557
cig:CemigGeracaoOesteSAMember
2020-01-01
2020-12-31
0001157557
cig:CemigGeracaoTresMariasSAMember
2018-12-31
0001157557
cig:CemigGeracaoTresMariasSAMember
2019-01-01
2019-12-31
0001157557
cig:CemigGeracaoSaltoGrandeSAMember
2018-12-31
0001157557
cig:CemigGeracaoSaltoGrandeSAMember
2019-01-01
2019-12-31
0001157557
cig:CemigGeracaoItutingaSAMember
2018-12-31
0001157557
cig:CemigGeracaoItutingaSAMember
2019-01-01
2019-12-31
0001157557
cig:CemigGeracaoCamargosSAMember
2018-12-31
0001157557
cig:CemigGeracaoCamargosSAMember
2019-01-01
2019-12-31
0001157557
cig:CemigGeracaoSulSAMember
2018-12-31
0001157557
cig:CemigGeracaoSulSAMember
2019-01-01
2019-12-31
0001157557
cig:CemigGeracaoLesteSAMember
2018-12-31
0001157557
cig:CemigGeracaoLesteSAMember
2019-01-01
2019-12-31
0001157557
cig:CemigGeracaoOesteSAMember
2018-12-31
0001157557
cig:CemigGeracaoOesteSAMember
2019-01-01
2019-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
cig:QuotaForTheEnergyDevelopmentAccountMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:QuotaForTheEnergyDevelopmentAccountMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:QuotaForTheEnergyDevelopmentAccountMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
cig:QuotaForTheEnergyDevelopmentAccountMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:QuotaForTheEnergyDevelopmentAccountMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
cig:TariffForUseOfTransmissionFacilitiesOfGridParticipantsMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:TariffForUseOfTransmissionFacilitiesOfGridParticipantsMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:TariffForUseOfTransmissionFacilitiesOfGridParticipantsMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:TariffForUseOfTransmissionFacilitiesOfGridParticipantsMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:TariffForUseOfTransmissionFacilitiesOfGridParticipantsMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
cig:TariffForTransportOfElectricityProvidedByItaiputsMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:TariffForTransportOfElectricityProvidedByItaiputsMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:TariffForTransportOfElectricityProvidedByItaiputsMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:TariffForTransportOfElectricityProvidedByItaiputsMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:TariffForTransportOfElectricityProvidedByItaiputsMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
cig:ProgramToEncourageAlternativeSourcesOfElectricityProinfaMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:ProgramToEncourageAlternativeSourcesOfElectricityProinfaMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:ProgramToEncourageAlternativeSourcesOfElectricityProinfaMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:ProgramToEncourageAlternativeSourcesOfElectricityProinfaMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:ProgramToEncourageAlternativeSourcesOfElectricityProinfaMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
cig:SystemServiceChargesAndReserveEnergyChargeMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:SystemServiceChargesAndReserveEnergyChargeMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:SystemServiceChargesAndReserveEnergyChargeMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
cig:SystemServiceChargesAndReserveEnergyChargeMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:SystemServiceChargesAndReserveEnergyChargeMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:SystemServiceChargesAndReserveEnergyChargeMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
cig:EnergyPurchasedForResaleMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:EnergyPurchasedForResaleMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:EnergyPurchasedForResaleMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
cig:EnergyPurchasedForResaleMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:EnergyPurchasedForResaleMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:EnergyPurchasedForResaleMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
cig:OvercontractingOfSupplyMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:OvercontractingOfSupplyMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:OvercontractingOfSupplyMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
cig:OvercontractingOfSupplyMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:OvercontractingOfSupplyMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:OvercontractingOfSupplyMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
cig:NeutralityOfPortionAMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:NeutralityOfPortionAMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:NeutralityOfPortionAMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
cig:NeutralityOfPortionAMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:NeutralityOfPortionAMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:NeutralityOfPortionAMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
cig:BillingreturnMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:BillingreturnMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
cig:BillingreturnMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:BillingreturnMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:BillingreturnMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
cig:OtherFinancialItemsMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:OtherFinancialItemsMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:OtherFinancialItemsMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:OtherFinancialItemsMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:OtherFinancialItemsMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
cig:ExcessDemandAndReactivePowerMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:ExcessDemandAndReactivePowerMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:ExcessDemandAndReactivePowerMember
2021-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
cig:ExcessDemandAndReactivePowerMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
cig:ExcessDemandAndReactivePowerMember
2020-12-31
0001157557
cig:CVAAccountForCompensationOfChangesInPortionACostsMember
cig:ExcessDemandAndReactivePowerMember
2020-12-31
0001157557
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
2021-12-31
0001157557
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
2021-12-31
0001157557
cig:AmountsRatifiedByAneelInTheLastTariffAdjustmentMember
2020-12-31
0001157557
cig:AmountsRatifiedByAneelInTheNextTariffAdjustmentMember
2020-12-31
0001157557
cig:DistributionInfrastructureAssetsUnderConstructionMember
2021-12-31
0001157557
cig:DistributionInfrastructureAssetsUnderConstructionMember
2020-12-31
0001157557
cig:GasInfrastructureAssetsUnderConstructionMember
2021-12-31
0001157557
cig:GasInfrastructureAssetsUnderConstructionMember
2020-12-31
0001157557
cig:NationalGridMember
2021-12-31
0001157557
cig:NationalGridMember
2020-12-31
0001157557
cig:TransmissionIndemnityAssetsIncorporatedIntoTheAssetsRemunerationBaseMember
2021-12-31
0001157557
cig:TransmissionIndemnityAssetsIncorporatedIntoTheAssetsRemunerationBaseMember
2020-12-31
0001157557
cig:Restated1Member
2021-12-31
0001157557
cig:Restated1Member
2020-12-31
0001157557
cig:TransmissionSegmentMember
2018-12-31
0001157557
cig:DistributionSegmentMember
2018-12-31
0001157557
cig:GasAndPowerSegmentMember
2018-12-31
0001157557
cig:TransmissionSegmentMember
2019-01-01
2019-12-31
0001157557
cig:DistributionSegmentMember
2019-01-01
2019-12-31
0001157557
cig:GasAndPowerSegmentMember
2019-01-01
2019-12-31
0001157557
cig:TransmissionSegmentMember
2019-12-31
0001157557
cig:DistributionSegmentMember
2019-12-31
0001157557
cig:GasAndPowerSegmentMember
2019-12-31
0001157557
cig:TransmissionSegmentMember
2020-01-01
2020-12-31
0001157557
cig:DistributionSegmentMember
2020-01-01
2020-12-31
0001157557
cig:GasAndPowerSegmentMember
2020-01-01
2020-12-31
0001157557
cig:TransmissionSegmentMember
2020-12-31
0001157557
cig:DistributionSegmentMember
2020-12-31
0001157557
cig:GasAndPowerSegmentMember
2020-12-31
0001157557
cig:TransmissionSegmentMember
2021-01-01
2021-12-31
0001157557
cig:DistributionSegmentMember
2021-01-01
2021-12-31
0001157557
cig:GasAndPowerSegmentMember
2021-01-01
2021-12-31
0001157557
cig:TransmissionSegmentMember
2021-12-31
0001157557
cig:DistributionSegmentMember
2021-12-31
0001157557
cig:GasAndPowerSegmentMember
2021-12-31
0001157557
cig:Contract0792020Member
2021-01-01
2021-12-31
0001157557
cig:ConcessionContractOneMember
2021-12-31
0001157557
cig:ConcessionContractOneMember
2020-12-31
0001157557
cig:ConcessionContractTwoMember
2021-12-31
0001157557
cig:ConcessionContractTwoMember
2020-12-31
0001157557
cig:ConcessionContractThreeMember
2021-12-31
0001157557
cig:ConcessionContractThreeMember
2020-12-31
0001157557
cig:NationalGridRBSEMember
2021-12-31
0001157557
cig:NationalGridRBSEMember
2020-12-31
0001157557
cig:NationalGridFacilitiesRBNIMember
2021-12-31
0001157557
cig:NationalGridFacilitiesRBNIMember
2020-12-31
0001157557
ifrs-full:CurrentMember
2021-12-31
0001157557
ifrs-full:CurrentMember
2020-12-31
0001157557
cig:NonCurrentMember
2021-12-31
0001157557
cig:NonCurrentMember
2020-12-31
0001157557
cig:HidreletricaCachoeiraoMember
2021-01-01
2021-12-31
0001157557
cig:HidreletricaCachoeiraoMember
2021-12-31
0001157557
cig:HidreletricaCachoeiraoMember
2020-12-31
0001157557
cig:GuanhaesEnergiaMember
2021-01-01
2021-12-31
0001157557
cig:GuanhaesEnergiaMember
2021-12-31
0001157557
cig:GuanhaesEnergiaMember
2020-12-31
0001157557
cig:HidreletricaPipocaMember
2021-01-01
2021-12-31
0001157557
cig:HidreletricaPipocaMember
2021-12-31
0001157557
cig:HidreletricaPipocaMember
2020-12-31
0001157557
cig:RetiroBaixoMember
2021-01-01
2021-12-31
0001157557
cig:RetiroBaixoMember
2021-12-31
0001157557
cig:RetiroBaixoMember
2020-12-31
0001157557
cig:AliancaNorteMember
2021-01-01
2021-12-31
0001157557
cig:AliancaNorteMember
2021-12-31
0001157557
cig:AliancaNorteMember
2020-12-31
0001157557
cig:AmazoniaEnergiaMember
2021-12-31
0001157557
cig:AmazoniaEnergiaMember
2020-12-31
0001157557
cig:MadeiraEnergiaMember
2021-01-01
2021-12-31
0001157557
cig:MadeiraEnergiaMember
2021-12-31
0001157557
cig:MadeiraEnergiaMember
2020-12-31
0001157557
cig:FipMelbourneMember
2021-01-01
2021-12-31
0001157557
cig:FipMelbourneMember
2021-12-31
0001157557
cig:FipMelbourneMember
2020-12-31
0001157557
cig:LightgerMember
2021-01-01
2021-12-31
0001157557
cig:LightgerMember
2021-12-31
0001157557
cig:LightgerMember
2020-12-31
0001157557
cig:BaguariEnergiaMember
2021-01-01
2021-12-31
0001157557
cig:BaguariEnergiaMember
2021-12-31
0001157557
cig:BaguariEnergiaMember
2020-12-31
0001157557
cig:AliancaGeracaoMember
2021-01-01
2021-12-31
0001157557
cig:AliancaGeracaoMember
2021-12-31
0001157557
cig:AliancaGeracaoMember
2020-12-31
0001157557
cig:TaesaMember
2021-01-01
2021-12-31
0001157557
cig:TaesaMember
2021-12-31
0001157557
cig:TaesaMember
2020-12-31
0001157557
cig:AtivasDataCenterMember
2021-01-01
2021-12-31
0001157557
cig:AtivasDataCenterMember
2021-12-31
0001157557
cig:AtivasDataCenterMember
2020-12-31
0001157557
cig:UFVJanaubaGeracaoDeEnergiaEletricaDistribuidaMember
2021-01-01
2021-12-31
0001157557
cig:UFVJanaubaGeracaoDeEnergiaEletricaDistribuidaMember
2021-12-31
0001157557
cig:UFVJanaubaGeracaoDeEnergiaEletricaDistribuidaMember
2020-12-31
0001157557
cig:UFVMangaGeracaoDeEnergiaEletricaDistribuidatMember
2021-01-01
2021-12-31
0001157557
cig:UFVMangaGeracaoDeEnergiaEletricaDistribuidatMember
2021-12-31
0001157557
cig:UFVMangaGeracaoDeEnergiaEletricaDistribuidatMember
2020-12-31
0001157557
cig:UFVCorintoGeracaoDeEnergiaEletricaSAMember
2021-01-01
2021-12-31
0001157557
cig:UFVCorintoGeracaoDeEnergiaEletricaSAMember
2021-12-31
0001157557
cig:UFVCorintoGeracaoDeEnergiaEletricaSAMember
2020-12-31
0001157557
cig:UFVBonfinopolisGeracaoDeEnergiaEletricaDistribuidaMember
2021-01-01
2021-12-31
0001157557
cig:UFVBonfinopolisGeracaoDeEnergiaEletricaDistribuidaMember
2021-12-31
0001157557
cig:UFVBonfinopolisGeracaoDeEnergiaEletricaDistribuidaMember
2020-12-31
0001157557
cig:UFVLagoaGrandeGeracaoDeEnergiaEletricaDistribuidaMember
2021-01-01
2021-12-31
0001157557
cig:UFVLagoaGrandeGeracaoDeEnergiaEletricaDistribuidaMember
2021-12-31
0001157557
cig:UFVLagoaGrandeGeracaoDeEnergiaEletricaDistribuidaMember
2020-12-31
0001157557
cig:UFVLontraGeracaoDeEnergiaEletricaDistribuidaMember
2021-01-01
2021-12-31
0001157557
cig:UFVLontraGeracaoDeEnergiaEletricaDistribuidaMember
2021-12-31
0001157557
cig:UFVLontraGeracaoDeEnergiaEletricaDistribuidaMember
2020-12-31
0001157557
cig:UFVMatoVerdeGeracaoDeEnergiaEletricaDistribuidaMember
2021-01-01
2021-12-31
0001157557
cig:UFVMatoVerdeGeracaoDeEnergiaEletricaDistribuidaMember
2021-12-31
0001157557
cig:UFVMatoVerdeGeracaoDeEnergiaEletricaDistribuidaMember
2020-12-31
0001157557
cig:UFVMirabelaGeracaoDeEnergiaEletricaDistribuidaMember
2021-01-01
2021-12-31
0001157557
cig:UFVMirabelaGeracaoDeEnergiaEletricaDistribuidaMember
2021-12-31
0001157557
cig:UFVMirabelaGeracaoDeEnergiaEletricaDistribuidaMember
2020-12-31
0001157557
cig:UFVPorteirinhaIGeracaoDeEnergiaEletricaDistribuidaMember
2021-01-01
2021-12-31
0001157557
cig:UFVPorteirinhaIGeracaoDeEnergiaEletricaDistribuidaMember
2021-12-31
0001157557
cig:UFVPorteirinhaIGeracaoDeEnergiaEletricaDistribuidaMember
2020-12-31
0001157557
cig:UFVPorteirinhaIIGeracaoDeEnergiaEletricaDistribuidaMember
2021-01-01
2021-12-31
0001157557
cig:UFVPorteirinhaIIGeracaoDeEnergiaEletricaDistribuidaMember
2021-12-31
0001157557
cig:UFVPorteirinhaIIGeracaoDeEnergiaEletricaDistribuidaMember
2020-12-31
0001157557
cig:UFVPorteirinhaIIGeracaoDeEnergiaEletricaDistribuida1Member
2021-01-01
2021-12-31
0001157557
cig:UFVPorteirinhaIIGeracaoDeEnergiaEletricaDistribuida1Member
2021-12-31
0001157557
cig:AxxiomSolucoesTecnologicasMember
2021-01-01
2021-12-31
0001157557
cig:AxxiomSolucoesTecnologicasMember
2021-12-31
0001157557
cig:AxxiomSolucoesTecnologicasMember
2020-12-31
0001157557
cig:InvestmentsPropertyMember
2021-12-31
0001157557
cig:InvestmentsPropertyMember
2020-12-31
0001157557
cig:ItaocaraProvisionForLossesMember
2021-01-01
2021-12-31
0001157557
cig:ItaocaraProvisionForLossesMember
2021-12-31
0001157557
cig:ItaocaraProvisionForLossesMember
2020-12-31
0001157557
cig:MadeiraEnergia1Member
2021-01-01
2021-12-31
0001157557
cig:MadeiraEnergia1Member
2021-12-31
0001157557
cig:CentralEolicaPraiasdeParajuruSAMember
2020-01-01
2020-12-31
0001157557
cig:CentralEolicaVoltadoRioSAMember
2020-01-01
2020-12-31
0001157557
cig:RenovaMember
cig:EventsAfterReportingPeriodMember
ifrs-full:BottomOfRangeMember
2021-02-26
2021-03-01
0001157557
cig:AmazoniaEnergiaSAAndAliancaNorteEnergiaSAMember
2021-01-01
2021-12-31
0001157557
cig:AmazoniaEnergiaSAAndAliancaNorteEnergiaSAMember
2020-01-01
2020-12-31
0001157557
cig:RetiroBaixoMember
2018-12-31
0001157557
cig:RetiroBaixoMember
2019-01-01
2019-12-31
0001157557
cig:RetiroBaixoMember
2019-12-31
0001157557
cig:RetiroBaixoMember
2020-01-01
2020-12-31
0001157557
cig:MadeiraEnergiaMember
2018-12-31
0001157557
cig:MadeiraEnergiaMember
2019-01-01
2019-12-31
0001157557
cig:MadeiraEnergiaMember
2019-12-31
0001157557
cig:MadeiraEnergiaMember
2020-01-01
2020-12-31
0001157557
cig:LightgerMember
2018-12-31
0001157557
cig:LightgerMember
2019-01-01
2019-12-31
0001157557
cig:LightgerMember
2019-12-31
0001157557
cig:LightgerMember
2020-01-01
2020-12-31
0001157557
cig:AliancaGeracaoMember
2018-12-31
0001157557
cig:AliancaGeracaoMember
2019-01-01
2019-12-31
0001157557
cig:AliancaGeracaoMember
2019-12-31
0001157557
cig:AliancaGeracaoMember
2020-01-01
2020-12-31
0001157557
cig:AliancaNorteMember
2018-12-31
0001157557
cig:AliancaNorteMember
2019-01-01
2019-12-31
0001157557
cig:AliancaNorteMember
2019-12-31
0001157557
cig:AliancaNorteMember
2020-01-01
2020-12-31
0001157557
cig:TaesaMember
2018-12-31
0001157557
cig:TaesaMember
2019-01-01
2019-12-31
0001157557
cig:TaesaMember
2019-12-31
0001157557
cig:TaesaMember
2020-01-01
2020-12-31
0001157557
cig:MadeiraEnergia1Member
2020-12-31
0001157557
cig:FIPMelbournesMember
2020-12-31
0001157557
cig:FIPMelbournesMember
2021-01-01
2021-12-31
0001157557
cig:AmazoniaEnergiaMember
2021-01-01
2021-12-31
0001157557
cig:UFVCorintoGeracaoDeEnergiaEletricaDistriiuidaMember
2020-12-31
0001157557
cig:UFVCorintoGeracaoDeEnergiaEletricaDistriiuidaMember
2021-01-01
2021-12-31
0001157557
cig:UFVCorintoGeracaoDeEnergiaEletricaDistriiuidaMember
2021-12-31
0001157557
cig:UFVMangaGeracaoDeEnergiaEletricaDistribuidaMember
2020-12-31
0001157557
cig:UFVMangaGeracaoDeEnergiaEletricaDistribuidaMember
2021-01-01
2021-12-31
0001157557
cig:UFVMangaGeracaoDeEnergiaEletricaDistribuidaMember
2021-12-31
0001157557
cig:UFVBonfinopolisIIGeracaoDeEnergiaEletricaDistribuidaMember
2020-12-31
0001157557
cig:UFVBonfinopolisIIGeracaoDeEnergiaEletricaDistribuidaMember
2021-12-31
0001157557
cig:UFVBrasilandiaGeracaoDeEnergiaEletricaDistribuidaMember
2020-12-31
0001157557
cig:UFVBrasilandiaGeracaoDeEnergiaEletricaDistribuidaMember
2021-01-01
2021-12-31
0001157557
cig:UFVBrasilandiaGeracaoDeEnergiaEletricaDistribuidaMember
2021-12-31
0001157557
cig:InvestmentsPropertyMember
2021-01-01
2021-12-31
0001157557
cig:CompanhiaDeTransmissaoCentroesteDeMinasMember
2019-12-31
0001157557
cig:CompanhiaDeTransmissaoCentroesteDeMinasMember
2020-01-01
2020-12-31
0001157557
cig:CompanhiaDeTransmissaoCentroesteDeMinasMember
2020-12-31
0001157557
cig:HidreletricaCachoeiraoMember
2019-12-31
0001157557
cig:HidreletricaCachoeiraoMember
2020-01-01
2020-12-31
0001157557
cig:GuanhaesEnergiaMember
2019-12-31
0001157557
cig:HidreletricaPipocaMember
2019-12-31
0001157557
cig:HidreletricaPipocaMember
2020-01-01
2020-12-31
0001157557
cig:FipMelbourneMember
2019-12-31
0001157557
cig:FipMelbourneMember
2020-01-01
2020-12-31
0001157557
cig:BaguariEnergiaMember
2019-12-31
0001157557
cig:BaguariEnergiaMember
2020-01-01
2020-12-31
0001157557
cig:AmazoniaEnergiaMember
2019-12-31
0001157557
cig:AmazoniaEnergiaMember
2020-01-01
2020-12-31
0001157557
cig:AtivasDataCenterMember
2019-12-31
0001157557
cig:AtivasDataCenterMember
2020-01-01
2020-12-31
0001157557
cig:UFVJanaubaGeracaoDeEnergiaEletricaDistribuidaMember
2019-12-31
0001157557
cig:UFVJanaubaGeracaoDeEnergiaEletricaDistribuidaMember
2020-01-01
2020-12-31
0001157557
cig:UFVCorintoGeracaoDeEnergiaEletricaDistriiuidaMember
2020-01-01
2020-12-31
0001157557
cig:UFVMangaGeracaoDeEnergiaEletricaDistribuidaMember
2020-01-01
2020-12-31
0001157557
cig:UFVBonfinopolisIIGeracaoDeEnergiaEletricaDistribuidaMember
2020-01-01
2020-12-31
0001157557
cig:UFVLagoaGrandeGeracaoDeEnergiaEletricaDistribuidaMember
2020-01-01
2020-12-31
0001157557
cig:UFVLontraGeracaoDeEnergiaEletricaDistribuidaMember
2020-01-01
2020-12-31
0001157557
cig:UFVMatoVerdeGeracaoDeEnergiaEletricaDistribuidaMembeMember
2020-01-01
2020-12-31
0001157557
cig:UFVMatoVerdeGeracaoDeEnergiaEletricaDistribuidaMembeMember
2020-12-31
0001157557
cig:UFVMirabelaGeracaoDeEnergiaEletricaDistribuidaMember
2020-01-01
2020-12-31
0001157557
cig:UFVPorteirinhaIGeracaoDeEnergiaEletricaDistribuidaMember
2020-01-01
2020-12-31
0001157557
cig:UFVPorteirinhaIIGeracaoDeEnergiaEletricaDistribuidaMember
2020-01-01
2020-12-31
0001157557
cig:AxxiomSolucoesTecnologicasMember
2019-12-31
0001157557
cig:AxxiomSolucoesTecnologicasMember
2020-01-01
2020-12-31
0001157557
cig:InvestmentsPropertyMember
2019-12-31
0001157557
cig:InvestmentsPropertyMember
2020-01-01
2020-12-31
0001157557
cig:UsinaHidreletricaItaocaraSAMember
2019-12-31
0001157557
cig:UsinaHidreletricaItaocaraSAMember
2020-01-01
2020-12-31
0001157557
cig:UsinaHidreletricaItaocaraSAMember
2020-12-31
0001157557
cig:CompanhiaDeTransmissaoCentroesteDeMinasMember
2018-12-31
0001157557
cig:CompanhiaDeTransmissaoCentroesteDeMinasMember
2019-01-01
2019-12-31
0001157557
cig:AxxiomSolucoesTecnologicasMember
2019-01-01
2019-12-31
0001157557
cig:GuanhaesEnergiaMember
2019-01-01
2019-12-31
0001157557
cig:UsinaHidreletricaItaocaraSAMember
2019-01-01
2019-12-31
0001157557
cig:HidreletricaPipocaMember
2018-12-31
0001157557
cig:HidreletricaPipocaMember
2019-01-01
2019-12-31
0001157557
cig:FipMelbourneMember
2018-12-31
0001157557
cig:FipMelbourneMember
2019-01-01
2019-12-31
0001157557
cig:HidreletricaCachoeiraoMember
2018-12-31
0001157557
cig:HidreletricaCachoeiraoMember
2019-01-01
2019-12-31
0001157557
cig:BaguariEnergiaMember
2018-12-31
0001157557
cig:BaguariEnergiaMember
2019-01-01
2019-12-31
0001157557
cig:AmazoniaEnergiaMember
2018-12-31
0001157557
cig:AmazoniaEnergiaMember
2019-01-01
2019-12-31
0001157557
cig:AtivasDataCenterMember
2018-12-31
0001157557
cig:UFVJanaubaGeracaoDeEnergiaEletricaDistribuidaMember
2018-12-31
0001157557
cig:UFVJanaubaGeracaoDeEnergiaEletricaDistribuidaMember
2019-01-01
2019-12-31
0001157557
cig:InvestmentsPropertyMember
2018-12-31
0001157557
cig:InvestmentsPropertyMember
2019-01-01
2019-12-31
0001157557
cig:ItaocaraProvisionForLossesMember
2019-01-01
2019-12-31
0001157557
cig:ItaocaraProvisionForLossesMember
2019-12-31
0001157557
cig:CemigGeracaoETransmissaoMember
2021-12-31
0001157557
cig:CemigGeracaoETransmissaoMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoETransmissaoMember
2020-01-01
2020-12-31
0001157557
cig:CemigGeracaoETransmissaoMember
2020-12-31
0001157557
cig:CemigGeracaoETransmissaoMember
2019-01-01
2019-12-31
0001157557
cig:CemigGeracaoETransmissaoMember
2019-12-31
0001157557
cig:MadeiraEnergia1Member
2021-12-31
0001157557
cig:MadeiraEnergia1Member
2021-01-01
2021-12-31
0001157557
cig:MadeiraEnergia1Member
2020-01-01
2020-12-31
0001157557
cig:MadeiraEnergia1Member
2020-12-31
0001157557
cig:MadeiraEnergia1Member
2019-01-01
2019-12-31
0001157557
cig:MadeiraEnergia1Member
2019-12-31
0001157557
cig:HidreletricaCachoeiraoMember
2021-12-31
0001157557
cig:HidreletricaCachoeiraoMember
2021-01-01
2021-12-31
0001157557
cig:HidreletricaCachoeiraoMember
2020-01-01
2020-12-31
0001157557
cig:HidreletricaCachoeiraoMember
2020-12-31
0001157557
cig:HidreletricaCachoeiraoMember
2019-01-01
2019-12-31
0001157557
cig:HidreletricaCachoeiraoMember
2019-12-31
0001157557
cig:GuanhaesEnergiaMember
2021-12-31
0001157557
cig:GuanhaesEnergiaMember
2021-01-01
2021-12-31
0001157557
cig:GuanhaesEnergiaMember
2020-01-01
2020-12-31
0001157557
cig:GuanhaesEnergiaMember
2020-12-31
0001157557
cig:GuanhaesEnergiaMember
2019-01-01
2019-12-31
0001157557
cig:GuanhaesEnergiaMember
2019-12-31
0001157557
cig:HidreletricaPipocaMember
2021-12-31
0001157557
cig:HidreletricaPipocaMember
2021-01-01
2021-12-31
0001157557
cig:HidreletricaPipocaMember
2020-01-01
2020-12-31
0001157557
cig:HidreletricaPipocaMember
2020-12-31
0001157557
cig:HidreletricaPipocaMember
2019-01-01
2019-12-31
0001157557
cig:HidreletricaPipocaMember
2019-12-31
0001157557
cig:BaguariEnergiaMember
2021-12-31
0001157557
cig:BaguariEnergiaMember
2021-01-01
2021-12-31
0001157557
cig:BaguariEnergiaMember
2020-01-01
2020-12-31
0001157557
cig:BaguariEnergiaMember
2020-12-31
0001157557
cig:BaguariEnergiaMember
2019-01-01
2019-12-31
0001157557
cig:BaguariEnergiaMember
2019-12-31
0001157557
cig:CentralEolicaPraiasDeParajuruMember
2021-12-31
0001157557
cig:CentralEolicaPraiasDeParajuruMember
2021-01-01
2021-12-31
0001157557
cig:CentralEolicaPraiasDeParajuruMember
2020-01-01
2020-12-31
0001157557
cig:CentralEolicaPraiasDeParajuruMember
2020-12-31
0001157557
cig:CentralEolicaPraiasDeParajuruMember
2019-01-01
2019-12-31
0001157557
cig:CentralEolicaPraiasDeParajuruMember
2019-12-31
0001157557
cig:CentralEolicaVoltaDoRioMember
2021-12-31
0001157557
cig:CentralEolicaVoltaDoRioMember
2021-01-01
2021-12-31
0001157557
cig:CentralEolicaVoltaDoRioMember
2020-01-01
2020-12-31
0001157557
cig:CentralEolicaVoltaDoRioMember
2020-12-31
0001157557
cig:CentralEolicaVoltaDoRioMember
2019-01-01
2019-12-31
0001157557
cig:CentralEolicaVoltaDoRioMember
2019-12-31
0001157557
cig:LightgerMember
2021-12-31
0001157557
cig:LightgerMember
2021-01-01
2021-12-31
0001157557
cig:LightgerMember
2020-01-01
2020-12-31
0001157557
cig:LightgerMember
2020-12-31
0001157557
cig:LightgerMember
2019-01-01
2019-12-31
0001157557
cig:LightgerMember
2019-12-31
0001157557
cig:AliancaNorteMember
2021-12-31
0001157557
cig:AliancaNorteMember
2021-01-01
2021-12-31
0001157557
cig:AliancaNorteMember
2020-01-01
2020-12-31
0001157557
cig:AliancaNorteMember
2020-12-31
0001157557
cig:AliancaNorteMember
2019-01-01
2019-12-31
0001157557
cig:AliancaNorteMember
2019-12-31
0001157557
cig:AmazoniaEnergiaMember
2021-12-31
0001157557
cig:AmazoniaEnergiaMember
2021-01-01
2021-12-31
0001157557
cig:AmazoniaEnergiaMember
2020-01-01
2020-12-31
0001157557
cig:AmazoniaEnergiaMember
2020-12-31
0001157557
cig:AmazoniaEnergiaMember
2019-01-01
2019-12-31
0001157557
cig:AmazoniaEnergiaMember
2019-12-31
0001157557
cig:AliancaGeracaoMember
2021-12-31
0001157557
cig:AliancaGeracaoMember
2021-01-01
2021-12-31
0001157557
cig:AliancaGeracaoMember
2020-01-01
2020-12-31
0001157557
cig:AliancaGeracaoMember
2020-12-31
0001157557
cig:AliancaGeracaoMember
2019-01-01
2019-12-31
0001157557
cig:AliancaGeracaoMember
2019-12-31
0001157557
cig:RetiroBaixoMember
2021-12-31
0001157557
cig:RetiroBaixoMember
2021-01-01
2021-12-31
0001157557
cig:RetiroBaixoMember
2020-01-01
2020-12-31
0001157557
cig:RetiroBaixoMember
2020-12-31
0001157557
cig:RetiroBaixoMember
2019-01-01
2019-12-31
0001157557
cig:RetiroBaixoMember
2019-12-31
0001157557
cig:UsinaHidreletricaItaocaraSAMember
2021-12-31
0001157557
cig:UsinaHidreletricaItaocaraSAMember
2021-01-01
2021-12-31
0001157557
cig:UsinaHidreletricaItaocaraSAMember
2020-01-01
2020-12-31
0001157557
cig:UsinaHidreletricaItaocaraSAMember
2020-12-31
0001157557
cig:UsinaHidreletricaItaocaraSAMember
2019-01-01
2019-12-31
0001157557
cig:UsinaHidreletricaItaocaraSAMember
2019-12-31
0001157557
cig:CemigGerTresMariasSAMember
2021-12-31
0001157557
cig:CemigGerTresMariasSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigGerTresMariasSAMember
2020-01-01
2020-12-31
0001157557
cig:CemigGerTresMariasSAMember
2020-12-31
0001157557
cig:CemigGerTresMariasSAMember
2019-01-01
2019-12-31
0001157557
cig:CemigGerTresMariasSAMember
2019-12-31
0001157557
cig:CemigGerSaltoGrandeSAMember
2021-12-31
0001157557
cig:CemigGerSaltoGrandeSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigGerSaltoGrandeSAMember
2020-01-01
2020-12-31
0001157557
cig:CemigGerSaltoGrandeSAMember
2020-12-31
0001157557
cig:CemigGerSaltoGrandeSAMember
2019-01-01
2019-12-31
0001157557
cig:CemigGerSaltoGrandeSAMember
2019-12-31
0001157557
cig:CemigGerItutingaSAMember
2021-12-31
0001157557
cig:CemigGerItutingaSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigGerItutingaSAMember
2020-01-01
2020-12-31
0001157557
cig:CemigGerItutingaSAMember
2020-12-31
0001157557
cig:CemigGerItutingaSAMember
2019-01-01
2019-12-31
0001157557
cig:CemigGerItutingaSAMember
2019-12-31
0001157557
cig:CemigGeracaoCamargosSAMember
2021-12-31
0001157557
cig:CemigGeracaoCamargosSAMember
2020-01-01
2020-12-31
0001157557
cig:CemigGeracaoCamargosSAMember
2020-12-31
0001157557
cig:CemigGeracaoCamargosSAMember
2019-01-01
2019-12-31
0001157557
cig:CemigGeracaoCamargosSAMember
2019-12-31
0001157557
cig:CemigGeracaoSulSAMember
2021-12-31
0001157557
cig:CemigGeracaoSulSAMember
2020-01-01
2020-12-31
0001157557
cig:CemigGeracaoSulSAMember
2020-12-31
0001157557
cig:CemigGeracaoSulSAMember
2019-01-01
2019-12-31
0001157557
cig:CemigGeracaoSulSAMember
2019-12-31
0001157557
cig:CemigGeracaoLesteSAMember
2021-12-31
0001157557
cig:CemigGeracaoLesteSAMember
2020-01-01
2020-12-31
0001157557
cig:CemigGeracaoLesteSAMember
2020-12-31
0001157557
cig:CemigGeracaoLesteSAMember
2019-01-01
2019-12-31
0001157557
cig:CemigGeracaoLesteSAMember
2019-12-31
0001157557
cig:CemigGeracaoOesteSAMember
2021-12-31
0001157557
cig:CemigGeracaoOesteSAMember
2020-01-01
2020-12-31
0001157557
cig:CemigGeracaoOesteSAMember
2020-12-31
0001157557
cig:CemigGeracaoOesteSAMember
2019-01-01
2019-12-31
0001157557
cig:CemigGeracaoOesteSAMember
2019-12-31
0001157557
cig:RosalEnergiaSAMember
2021-12-31
0001157557
cig:RosalEnergiaSAMember
2020-01-01
2020-12-31
0001157557
cig:RosalEnergiaSAMember
2020-12-31
0001157557
cig:RosalEnergiaSAMember
2019-01-01
2019-12-31
0001157557
cig:RosalEnergiaSAMember
2019-12-31
0001157557
cig:SaCarvalhoSAMember
2021-12-31
0001157557
cig:SaCarvalhoSAMember
2020-01-01
2020-12-31
0001157557
cig:SaCarvalhoSAMember
2020-12-31
0001157557
cig:SaCarvalhoSAMember
2019-01-01
2019-12-31
0001157557
cig:SaCarvalhoSAMember
2019-12-31
0001157557
cig:HorizontesEnergiaSAMember
2021-12-31
0001157557
cig:HorizontesEnergiaSAMember
2020-01-01
2020-12-31
0001157557
cig:HorizontesEnergiaSAMember
2020-12-31
0001157557
cig:HorizontesEnergiaSAMember
2019-01-01
2019-12-31
0001157557
cig:HorizontesEnergiaSAMember
2019-12-31
0001157557
cig:CemigPCHSAMember
2021-12-31
0001157557
cig:CemigPCHSAMember
2020-01-01
2020-12-31
0001157557
cig:CemigPCHSAMember
2020-12-31
0001157557
cig:CemigPCHSAMember
2019-01-01
2019-12-31
0001157557
cig:CemigPCHSAMember
2019-12-31
0001157557
cig:CemigGeracaoPocoFundoSAMember
2021-12-31
0001157557
cig:CemigGeracaoPocoFundoSAMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoPocoFundoSAMember
2020-01-01
2020-12-31
0001157557
cig:CemigGeracaoPocoFundoSAMember
2020-12-31
0001157557
cig:CemigGeracaoPocoFundoSAMember
2019-01-01
2019-12-31
0001157557
cig:CemigGeracaoPocoFundoSAMember
2019-12-31
0001157557
cig:EmpresaDeServicosDeComercializacaoDeEnergiaEletricaSAMember
2021-12-31
0001157557
cig:EmpresaDeServicosDeComercializacaoDeEnergiaEletricaSAMember
2021-01-01
2021-12-31
0001157557
cig:EmpresaDeServicosDeComercializacaoDeEnergiaEletricaSAMember
2020-01-01
2020-12-31
0001157557
cig:EmpresaDeServicosDeComercializacaoDeEnergiaEletricaSAMember
2020-12-31
0001157557
cig:EmpresaDeServicosDeComercializacaoDeEnergiaEletricaSAMember
2019-01-01
2019-12-31
0001157557
cig:EmpresaDeServicosDeComercializacaoDeEnergiaEletricaSAMember
2019-12-31
0001157557
cig:CemigTradingSAMember
2021-12-31
0001157557
cig:CemigTradingSAMember
2020-01-01
2020-12-31
0001157557
cig:CemigTradingSAMember
2020-12-31
0001157557
cig:CemigTradingSAMember
2019-01-01
2019-12-31
0001157557
cig:CemigTradingSAMember
2019-12-31
0001157557
cig:CemigDistribuicaoMember
2021-12-31
0001157557
cig:CemigDistribuicaoMember
2021-01-01
2021-12-31
0001157557
cig:CemigDistribuicaoMember
2020-01-01
2020-12-31
0001157557
cig:CemigDistribuicaoMember
2020-12-31
0001157557
cig:CemigDistribuicaoMember
2019-01-01
2019-12-31
0001157557
cig:CemigDistribuicaoMember
2019-12-31
0001157557
cig:TaesaMember
2021-12-31
0001157557
cig:TaesaMember
2021-01-01
2021-12-31
0001157557
cig:TaesaMember
2020-01-01
2020-12-31
0001157557
cig:TaesaMember
2020-12-31
0001157557
cig:TaesaMember
2019-01-01
2019-12-31
0001157557
cig:TaesaMember
2019-12-31
0001157557
cig:AtivasDataCenterMember
2021-12-31
0001157557
cig:AtivasDataCenterMember
2021-01-01
2021-12-31
0001157557
cig:AtivasDataCenterMember
2020-01-01
2020-12-31
0001157557
cig:AtivasDataCenterMember
2020-12-31
0001157557
cig:AtivasDataCenterMember
2019-12-31
0001157557
cig:GasmigMember
2021-12-31
0001157557
cig:GasmigMember
2021-01-01
2021-12-31
0001157557
cig:GasmigMember
2020-01-01
2020-12-31
0001157557
cig:GasmigMember
2020-12-31
0001157557
cig:GasmigMember
2019-01-01
2019-12-31
0001157557
cig:GasmigMember
2019-12-31
0001157557
cig:EfficientiaMember
2021-12-31
0001157557
cig:EfficientiaMember
2021-01-01
2021-12-31
0001157557
cig:EfficientiaMember
2020-01-01
2020-12-31
0001157557
cig:EfficientiaMember
2020-12-31
0001157557
cig:EfficientiaMember
2019-01-01
2019-12-31
0001157557
cig:EfficientiaMember
2019-12-31
0001157557
cig:CompanhiaDeTransmissaoCentroesteDeMinasMember
2021-12-31
0001157557
cig:CompanhiaDeTransmissaoCentroesteDeMinasMember
2021-01-01
2021-12-31
0001157557
cig:CompanhiaDeTransmissaoCentroesteDeMinasMember
2020-01-01
2020-12-31
0001157557
cig:CompanhiaDeTransmissaoCentroesteDeMinasMember
2020-12-31
0001157557
cig:CompanhiaDeTransmissaoCentroesteDeMinasMember
2019-01-01
2019-12-31
0001157557
cig:CompanhiaDeTransmissaoCentroesteDeMinasMember
2019-12-31
0001157557
cig:SeteLagoasTransmissoraDeEnergiaMember
2021-12-31
0001157557
cig:SeteLagoasTransmissoraDeEnergiaMember
2021-01-01
2021-12-31
0001157557
cig:AxxiomSolucoesTecnologicasMember
2021-12-31
0001157557
cig:AxxiomSolucoesTecnologicasMember
2021-01-01
2021-12-31
0001157557
cig:AxxiomSolucoesTecnologicasMember
2020-01-01
2020-12-31
0001157557
cig:AxxiomSolucoesTecnologicasMember
2020-12-31
0001157557
cig:AxxiomSolucoesTecnologicasMember
2019-01-01
2019-12-31
0001157557
cig:AxxiomSolucoesTecnologicasMember
2019-12-31
0001157557
cig:UFVBonfinopolisIIGeracaoDeEnergiaEletricaDistribuidaMember
2021-01-01
2021-12-31
0001157557
cig:UFVMatoVerdeGeracaoDeEnergiaEletricaDistribuidaMember
2020-01-01
2020-12-31
0001157557
cig:HidreletricaItaocaraSAMember
2021-12-31
0001157557
cig:HidreletricaItaocaraSAMember
2021-01-01
2021-12-31
0001157557
cig:UFVJanaubaMember
2021-12-31
0001157557
cig:UFVCorintoMember
2021-12-31
0001157557
cig:UFVMangaMember
2021-12-31
0001157557
cig:UFVBonfinopolisIIMember
2021-12-31
0001157557
cig:UFVLagoaGrandeMember
2021-12-31
0001157557
cig:UFVJanaubaMember
2021-01-01
2021-12-31
0001157557
cig:UFVCorintoMember
2021-01-01
2021-12-31
0001157557
cig:UFVMangaMember
2021-01-01
2021-12-31
0001157557
cig:UFVBonfinopolisIIMember
2021-01-01
2021-12-31
0001157557
cig:UFVLagoaGrandeMember
2021-01-01
2021-12-31
0001157557
cig:UFVLontraMember
2021-12-31
0001157557
cig:UFVMatoVerdeMember
2021-12-31
0001157557
cig:UFVMirabelaMember
2021-12-31
0001157557
cig:UFVPorteirinhaIMember
2021-12-31
0001157557
cig:UFVPorteirinhaIIMember
2021-12-31
0001157557
cig:UFVBrasilandiaMember
2021-12-31
0001157557
cig:UFVLontraMember
2021-01-01
2021-12-31
0001157557
cig:UFVMatoVerdeMember
2021-01-01
2021-12-31
0001157557
cig:UFVMirabelaMember
2021-01-01
2021-12-31
0001157557
cig:UFVPorteirinhaIMember
2021-01-01
2021-12-31
0001157557
cig:UFVPorteirinhaIIMember
2021-01-01
2021-12-31
0001157557
cig:UFVBrasilandiaMember
2021-01-01
2021-12-31
0001157557
cig:HidreletricaItaocaraSAMember
2020-12-31
0001157557
cig:HidreletricaItaocaraSAMember
2020-01-01
2020-12-31
0001157557
cig:RenovaMember
2020-12-31
0001157557
cig:GuanhaesEnergiaMember
2020-01-01
2020-12-31
0001157557
cig:RenovaMember
2020-01-01
2020-12-31
0001157557
cig:UFVJanaubaMember
2020-12-31
0001157557
cig:UFVCorintoMember
2020-12-31
0001157557
cig:UFVMangaMember
2020-12-31
0001157557
cig:UFVBonfinopolisIIMember
2020-12-31
0001157557
cig:UFVJanaubaMember
2020-01-01
2020-12-31
0001157557
cig:UFVCorintoMember
2020-01-01
2020-12-31
0001157557
cig:UFVMangaMember
2020-01-01
2020-12-31
0001157557
cig:UFVBonfinopolisIIMember
2020-01-01
2020-12-31
0001157557
cig:UFVLagoaGrandeMember
2020-12-31
0001157557
cig:UFVLontraMember
2020-12-31
0001157557
cig:UFVMatoVerdeMember
2020-12-31
0001157557
cig:UFVMirabelaMember
2020-12-31
0001157557
cig:UFVPorteirinhaIMember
2020-12-31
0001157557
cig:UFVPorteirinhaIIMember
2020-12-31
0001157557
cig:UFVLagoaGrandeMember
2020-01-01
2020-12-31
0001157557
cig:UFVLontraMember
2020-01-01
2020-12-31
0001157557
cig:UFVMatoVerdeMember
2020-01-01
2020-12-31
0001157557
cig:UFVMirabelaMember
2020-01-01
2020-12-31
0001157557
cig:UFVPorteirinhaIMember
2020-01-01
2020-12-31
0001157557
cig:UFVPorteirinhaIIMember
2020-01-01
2020-12-31
0001157557
cig:CentroesteMember
2019-12-31
0001157557
cig:CentroesteMember
2019-01-01
2019-12-31
0001157557
cig:AtivasDataCenterMember
2019-01-01
2019-12-31
0001157557
cig:RenovarestatedMember
2019-12-31
0001157557
cig:RenovarestatedMember
2019-01-01
2019-12-31
0001157557
ifrs-full:AtFairValueMember
2021-12-31
0001157557
ifrs-full:GrossCarryingAmountMember
ifrs-full:LandMember
ifrs-full:InvestmentPropertyCompletedMember
2021-12-31
0001157557
ifrs-full:AccumulatedDepreciationAndAmortisationMember
ifrs-full:LandMember
ifrs-full:InvestmentPropertyCompletedMember
2021-12-31
0001157557
ifrs-full:LandMember
ifrs-full:InvestmentPropertyCompletedMember
2021-12-31
0001157557
ifrs-full:GrossCarryingAmountMember
ifrs-full:LandMember
ifrs-full:InvestmentPropertyCompletedMember
2020-12-31
0001157557
ifrs-full:AccumulatedDepreciationAndAmortisationMember
ifrs-full:LandMember
ifrs-full:InvestmentPropertyCompletedMember
2020-12-31
0001157557
ifrs-full:LandMember
ifrs-full:InvestmentPropertyCompletedMember
2020-12-31
0001157557
ifrs-full:GrossCarryingAmountMember
ifrs-full:InvestmentPropertyCompletedMember
cig:ReservoirsDamsAndWaterCoursesMember
2021-12-31
0001157557
ifrs-full:AccumulatedDepreciationAndAmortisationMember
ifrs-full:InvestmentPropertyCompletedMember
cig:ReservoirsDamsAndWaterCoursesMember
2021-12-31
0001157557
ifrs-full:InvestmentPropertyCompletedMember
cig:ReservoirsDamsAndWaterCoursesMember
2021-12-31
0001157557
ifrs-full:GrossCarryingAmountMember
ifrs-full:InvestmentPropertyCompletedMember
cig:ReservoirsDamsAndWaterCoursesMember
2020-12-31
0001157557
ifrs-full:AccumulatedDepreciationAndAmortisationMember
ifrs-full:InvestmentPropertyCompletedMember
cig:ReservoirsDamsAndWaterCoursesMember
2020-12-31
0001157557
ifrs-full:InvestmentPropertyCompletedMember
cig:ReservoirsDamsAndWaterCoursesMember
2020-12-31
0001157557
ifrs-full:GrossCarryingAmountMember
ifrs-full:InvestmentPropertyCompletedMember
ifrs-full:BuildingsMember
2021-12-31
0001157557
ifrs-full:AccumulatedDepreciationAndAmortisationMember
ifrs-full:InvestmentPropertyCompletedMember
ifrs-full:BuildingsMember
2021-12-31
0001157557
ifrs-full:InvestmentPropertyCompletedMember
ifrs-full:BuildingsMember
2021-12-31
0001157557
ifrs-full:GrossCarryingAmountMember
ifrs-full:InvestmentPropertyCompletedMember
ifrs-full:BuildingsMember
2020-12-31
0001157557
ifrs-full:AccumulatedDepreciationAndAmortisationMember
ifrs-full:InvestmentPropertyCompletedMember
ifrs-full:BuildingsMember
2020-12-31
0001157557
ifrs-full:InvestmentPropertyCompletedMember
ifrs-full:BuildingsMember
2020-12-31
0001157557
ifrs-full:GrossCarryingAmountMember
ifrs-full:InvestmentPropertyCompletedMember
ifrs-full:MachineryMember
2021-12-31
0001157557
ifrs-full:AccumulatedDepreciationAndAmortisationMember
ifrs-full:InvestmentPropertyCompletedMember
ifrs-full:MachineryMember
2021-12-31
0001157557
ifrs-full:InvestmentPropertyCompletedMember
ifrs-full:MachineryMember
2021-12-31
0001157557
ifrs-full:GrossCarryingAmountMember
ifrs-full:InvestmentPropertyCompletedMember
ifrs-full:MachineryMember
2020-12-31
0001157557
ifrs-full:AccumulatedDepreciationAndAmortisationMember
ifrs-full:InvestmentPropertyCompletedMember
ifrs-full:MachineryMember
2020-12-31
0001157557
ifrs-full:InvestmentPropertyCompletedMember
ifrs-full:MachineryMember
2020-12-31
0001157557
ifrs-full:GrossCarryingAmountMember
ifrs-full:VehiclesMember
ifrs-full:InvestmentPropertyCompletedMember
2021-12-31
0001157557
ifrs-full:AccumulatedDepreciationAndAmortisationMember
ifrs-full:VehiclesMember
ifrs-full:InvestmentPropertyCompletedMember
2021-12-31
0001157557
ifrs-full:VehiclesMember
ifrs-full:InvestmentPropertyCompletedMember
2021-12-31
0001157557
ifrs-full:GrossCarryingAmountMember
ifrs-full:VehiclesMember
ifrs-full:InvestmentPropertyCompletedMember
2020-12-31
0001157557
ifrs-full:AccumulatedDepreciationAndAmortisationMember
ifrs-full:VehiclesMember
ifrs-full:InvestmentPropertyCompletedMember
2020-12-31
0001157557
ifrs-full:VehiclesMember
ifrs-full:InvestmentPropertyCompletedMember
2020-12-31
0001157557
ifrs-full:GrossCarryingAmountMember
ifrs-full:InvestmentPropertyCompletedMember
ifrs-full:FixturesAndFittingsMember
2021-12-31
0001157557
ifrs-full:AccumulatedDepreciationAndAmortisationMember
ifrs-full:InvestmentPropertyCompletedMember
ifrs-full:FixturesAndFittingsMember
2021-12-31
0001157557
ifrs-full:InvestmentPropertyCompletedMember
ifrs-full:FixturesAndFittingsMember
2021-12-31
0001157557
ifrs-full:GrossCarryingAmountMember
ifrs-full:InvestmentPropertyCompletedMember
ifrs-full:FixturesAndFittingsMember
2020-12-31
0001157557
ifrs-full:AccumulatedDepreciationAndAmortisationMember
ifrs-full:InvestmentPropertyCompletedMember
ifrs-full:FixturesAndFittingsMember
2020-12-31
0001157557
ifrs-full:InvestmentPropertyCompletedMember
ifrs-full:FixturesAndFittingsMember
2020-12-31
0001157557
ifrs-full:GrossCarryingAmountMember
ifrs-full:InvestmentPropertyCompletedMember
2021-12-31
0001157557
ifrs-full:AccumulatedDepreciationAndAmortisationMember
ifrs-full:InvestmentPropertyCompletedMember
2021-12-31
0001157557
ifrs-full:InvestmentPropertyCompletedMember
2021-12-31
0001157557
ifrs-full:GrossCarryingAmountMember
ifrs-full:InvestmentPropertyCompletedMember
2020-12-31
0001157557
ifrs-full:AccumulatedDepreciationAndAmortisationMember
ifrs-full:InvestmentPropertyCompletedMember
2020-12-31
0001157557
ifrs-full:InvestmentPropertyCompletedMember
2020-12-31
0001157557
ifrs-full:InvestmentPropertyUnderConstructionOrDevelopmentMember
2021-12-31
0001157557
ifrs-full:InvestmentPropertyUnderConstructionOrDevelopmentMember
2020-12-31
0001157557
ifrs-full:GrossCarryingAmountMember
2021-12-31
0001157557
ifrs-full:GrossCarryingAmountMember
2020-12-31
0001157557
ifrs-full:FixturesAndFittingsMember
ifrs-full:InvestmentPropertyCompletedMember
2021-01-01
2021-12-31
0001157557
ifrs-full:LandMember
ifrs-full:InvestmentPropertyCompletedMember
2021-01-01
2021-12-31
0001157557
cig:InvestmentPropertyCompleted1Member
2020-12-31
0001157557
cig:InvestmentPropertyCompleted1Member
2021-01-01
2021-12-31
0001157557
cig:InvestmentPropertyCompleted1Member
2021-12-31
0001157557
cig:InvestmentPropertyCompleted2Member
2020-12-31
0001157557
cig:InvestmentPropertyCompleted2Member
2021-01-01
2021-12-31
0001157557
cig:InvestmentPropertyCompleted3Member
2020-12-31
0001157557
cig:InvestmentPropertyCompleted3Member
2021-01-01
2021-12-31
0001157557
cig:InvestmentPropertyCompleted3Member
2021-12-31
0001157557
cig:InvestmentPropertyCompleted4Member
2020-12-31
0001157557
cig:InvestmentPropertyCompleted4Member
2021-01-01
2021-12-31
0001157557
cig:InvestmentPropertyCompleted4Member
2021-12-31
0001157557
cig:InvestmentPropertyCompleted5Member
2020-12-31
0001157557
cig:InvestmentPropertyCompleted5Member
2021-01-01
2021-12-31
0001157557
cig:InvestmentPropertyCompleted5Member
2021-12-31
0001157557
cig:InvestmentPropertyCompleted6Member
2020-12-31
0001157557
cig:InvestmentPropertyCompleted6Member
2021-01-01
2021-12-31
0001157557
cig:InvestmentPropertyCompleted6Member
2021-12-31
0001157557
ifrs-full:InvestmentPropertyCompletedMember
2021-01-01
2021-12-31
0001157557
ifrs-full:InvestmentPropertyCompletedMember
2019-12-31
0001157557
ifrs-full:InvestmentPropertyCompletedMember
2020-01-01
2020-12-31
0001157557
cig:InvestmentPropertyCompleted1Member
2019-12-31
0001157557
cig:InvestmentPropertyCompleted1Member
2020-01-01
2020-12-31
0001157557
cig:InvestmentPropertyCompleted1Member
2018-01-01
2018-12-31
0001157557
cig:InvestmentPropertyCompleted2Member
2019-12-31
0001157557
cig:InvestmentPropertyCompleted2Member
2020-01-01
2020-12-31
0001157557
cig:InvestmentPropertyCompleted2Member
2018-01-01
2018-12-31
0001157557
cig:InvestmentPropertyCompleted3Member
2019-12-31
0001157557
cig:InvestmentPropertyCompleted3Member
2020-01-01
2020-12-31
0001157557
cig:InvestmentPropertyCompleted3Member
2018-01-01
2018-12-31
0001157557
cig:InvestmentPropertyCompleted4Member
2019-12-31
0001157557
cig:InvestmentPropertyCompleted4Member
2020-01-01
2020-12-31
0001157557
cig:InvestmentPropertyCompleted4Member
2018-01-01
2018-12-31
0001157557
cig:InvestmentPropertyCompleted5Member
2019-12-31
0001157557
cig:InvestmentPropertyCompleted5Member
2020-01-01
2020-12-31
0001157557
cig:InvestmentPropertyCompleted5Member
2018-01-01
2018-12-31
0001157557
cig:InvestmentPropertyCompleted6Member
2019-12-31
0001157557
cig:InvestmentPropertyCompleted6Member
2020-01-01
2020-12-31
0001157557
cig:InvestmentPropertyCompleted6Member
2018-01-01
2018-12-31
0001157557
ifrs-full:InvestmentPropertyUnderConstructionOrDevelopmentMember
2019-12-31
0001157557
ifrs-full:InvestmentPropertyUnderConstructionOrDevelopmentMember
2020-01-01
2020-12-31
0001157557
ifrs-full:InvestmentPropertyUnderConstructionOrDevelopmentMember
2018-01-01
2018-12-31
0001157557
ifrs-full:InvestmentPropertyCompletedMember
2018-01-01
2018-12-31
0001157557
ifrs-full:InvestmentPropertyCompletedMember
2018-12-31
0001157557
ifrs-full:InvestmentPropertyCompletedMember
2019-01-01
2019-12-31
0001157557
cig:InvestmentPropertyCompleted1Member
2018-12-31
0001157557
cig:InvestmentPropertyCompleted1Member
2019-01-01
2019-12-31
0001157557
cig:InvestmentPropertyCompleted2Member
2018-12-31
0001157557
cig:InvestmentPropertyCompleted2Member
2019-01-01
2019-12-31
0001157557
cig:InvestmentPropertyCompleted3Member
2018-12-31
0001157557
cig:InvestmentPropertyCompleted3Member
2019-01-01
2019-12-31
0001157557
cig:InvestmentPropertyCompleted4Member
2018-12-31
0001157557
cig:InvestmentPropertyCompleted4Member
2019-01-01
2019-12-31
0001157557
cig:InvestmentPropertyCompleted5Member
2018-12-31
0001157557
cig:InvestmentPropertyCompleted5Member
2019-01-01
2019-12-31
0001157557
cig:InvestmentPropertyCompleted6Member
2018-12-31
0001157557
cig:InvestmentPropertyCompleted6Member
2019-01-01
2019-12-31
0001157557
ifrs-full:InvestmentPropertyUnderConstructionOrDevelopmentMember
2018-12-31
0001157557
ifrs-full:InvestmentPropertyUnderConstructionOrDevelopmentMember
2019-01-01
2019-12-31
0001157557
2018-01-01
2018-12-31
0001157557
cig:ReservoirsDamsAndWaterCoursesMember
2021-01-01
2021-12-31
0001157557
ifrs-full:ComputerSoftwareMember
2021-01-01
2021-12-31
0001157557
cig:BuildingsMachineRoomMember
2021-01-01
2021-12-31
0001157557
ifrs-full:VehiclesMember
2021-01-01
2021-12-31
0001157557
cig:BuildingsOtherMember
2021-01-01
2021-12-31
0001157557
cig:ITEquipmentInGeneralMember
2021-01-01
2021-12-31
0001157557
cig:GeneratorMember
2021-01-01
2021-12-31
0001157557
cig:GeneralEquipmentMember
2021-01-01
2021-12-31
0001157557
cig:WaterTurbineMember
2021-01-01
2021-12-31
0001157557
cig:PressureTunnelMember
2021-01-01
2021-12-31
0001157557
cig:CommandStationPanelAndCubicleMember
2021-01-01
2021-12-31
0001157557
cig:FloodgateMember
2021-01-01
2021-12-31
0001157557
cig:HydroelectricGenerationMember
2021-01-01
2021-12-31
0001157557
cig:WindPowerGenerationMember
2021-01-01
2021-12-31
0001157557
cig:AdministrationMember
2021-01-01
2021-12-31
0001157557
cig:HydroelectricGenerationMember
2020-01-01
2020-12-31
0001157557
cig:HydroelectricGenerationMember
2019-01-01
2019-12-31
0001157557
cig:UsinaDeQueimadoMember
2021-01-01
2021-12-31
0001157557
cig:UsinaDeQueimadoMember
2020-01-01
2020-12-31
0001157557
cig:AccumulatedDepreciationMember
2021-01-01
2021-12-31
0001157557
cig:AccumulatedDepreciationMember
2020-01-01
2020-12-31
0001157557
cig:UsinaDeQueimado1Member
2021-01-01
2021-12-31
0001157557
cig:UsinaDeQueimado1Member
2020-01-01
2020-12-31
0001157557
cig:TemporaryEasementIntangibleAssetsMember
2021-12-31
0001157557
cig:TemporaryEasementIntangibleAssetsMember
2020-12-31
0001157557
cig:TemporaryEasementIntangibleAssetsMember
ifrs-full:AccumulatedDepreciationAndAmortisationMember
2020-12-31
0001157557
cig:OnerousConcessionMember
2021-12-31
0001157557
cig:OnerousConcessionMember
2021-12-31
0001157557
cig:OnerousConcessionMember
2020-12-31
0001157557
cig:OnerousConcessionMember
2020-12-31
0001157557
ifrs-full:ServiceConcessionRightsMember
2021-12-31
0001157557
cig:AssetsOfConcessionMember
2021-12-31
0001157557
ifrs-full:ServiceConcessionRightsMember
2020-12-31
0001157557
cig:AssetsOfConcessionMember
ifrs-full:AccumulatedDepreciationAndAmortisationMember
2020-12-31
0001157557
cig:AssetsOfConcessionMember
2020-12-31
0001157557
cig:AssetsOfConcessionGSFMember
2021-12-31
0001157557
cig:AssetsOfConcessionGSFMember
2020-12-31
0001157557
cig:AssetsOfConcessionGSFMember
ifrs-full:AccumulatedDepreciationAndAmortisationMember
2020-12-31
0001157557
ifrs-full:OtherIntangibleAssetsMember
2021-12-31
0001157557
ifrs-full:OtherIntangibleAssetsMember
2020-12-31
0001157557
ifrs-full:OtherIntangibleAssetsMember
ifrs-full:AccumulatedDepreciationAndAmortisationMember
2020-12-31
0001157557
ifrs-full:GrossCarryingAmountMember
ifrs-full:IntangibleAssetsUnderDevelopmentMember
2021-12-31
0001157557
ifrs-full:AccumulatedDepreciationAndAmortisationMember
cig:UsefulLifeDefinedIntangibleAssetMember
2021-12-31
0001157557
cig:UsefulLifeDefinedIntangibleAssetMember
2021-12-31
0001157557
ifrs-full:GrossCarryingAmountMember
ifrs-full:IntangibleAssetsUnderDevelopmentMember
2020-12-31
0001157557
ifrs-full:AccumulatedDepreciationAndAmortisationMember
cig:UsefulLifeDefinedIntangibleAssetMember
2020-12-31
0001157557
cig:UsefulLifeDefinedIntangibleAssetMember
2020-12-31
0001157557
ifrs-full:IntangibleAssetsUnderDevelopmentMember
2021-12-31
0001157557
ifrs-full:IntangibleAssetsUnderDevelopmentMember
2020-12-31
0001157557
cig:UsefulLifeDefinedIntangibleAssetMember
ifrs-full:IntangibleAssetsUnderDevelopmentMember
2020-12-31
0001157557
ifrs-full:AccumulatedDepreciationAndAmortisationMember
2020-12-31
0001157557
cig:TemporaryEasementsIntangibleAssetsMember
2020-12-31
0001157557
cig:TemporaryEasementsIntangibleAssetsMember
2021-01-01
2021-12-31
0001157557
cig:TemporaryEasementsIntangibleAssetsMember
2021-12-31
0001157557
cig:OnerousConcessionIntangibleAssetsMember
2020-12-31
0001157557
cig:OnerousConcessionIntangibleAssetsMember
2021-01-01
2021-12-31
0001157557
cig:OnerousConcessionIntangibleAssetsMember
2021-12-31
0001157557
cig:AssetsOfConcessionIntangibleAssetsMember
2020-12-31
0001157557
cig:AssetsOfConcessionIntangibleAssetsMember
2021-01-01
2021-12-31
0001157557
cig:AssetsOfConcessionIntangibleAssetsMember
2021-12-31
0001157557
cig:AssetsOfConcessionGSFIntangibleAssetsMember
2020-12-31
0001157557
cig:AssetsOfConcessionGSFIntangibleAssetsMember
2021-01-01
2021-12-31
0001157557
cig:AssetsOfConcessionGSFIntangibleAssetsMember
2021-12-31
0001157557
cig:OthersIntangibleAssetsMember
2020-12-31
0001157557
cig:OthersIntangibleAssetsMember
2021-01-01
2021-12-31
0001157557
cig:OthersIntangibleAssetsMember
2021-12-31
0001157557
cig:InProgressMember
2020-12-31
0001157557
cig:InProgressMember
2021-01-01
2021-12-31
0001157557
cig:InProgressMember
2021-12-31
0001157557
cig:NetIntangibleAssetsMember
2020-12-31
0001157557
cig:NetIntangibleAssetsMember
2021-01-01
2021-12-31
0001157557
cig:NetIntangibleAssetsMember
2021-12-31
0001157557
cig:TemporaryEasementsIntangibleAssetsMember
2019-12-31
0001157557
cig:TemporaryEasementsIntangibleAssetsMember
2020-01-01
2020-12-31
0001157557
cig:OnerousConcessionIntangibleAssetsMember
2019-12-31
0001157557
cig:OnerousConcessionIntangibleAssetsMember
2020-01-01
2020-12-31
0001157557
cig:AssetsOfConcessionIntangibleAssetsMember
2019-12-31
0001157557
cig:AssetsOfConcessionIntangibleAssetsMember
2020-01-01
2020-12-31
0001157557
cig:OthersIntangibleAssetsMember
2019-12-31
0001157557
cig:OthersIntangibleAssetsMember
2020-01-01
2020-12-31
0001157557
cig:UsefulLifeDefinedIntangibleAssetMember
2019-12-31
0001157557
cig:UsefulLifeDefinedIntangibleAssetMember
2020-01-01
2020-12-31
0001157557
ifrs-full:IntangibleAssetsUnderDevelopmentMember
2019-12-31
0001157557
ifrs-full:IntangibleAssetsUnderDevelopmentMember
2020-01-01
2020-12-31
0001157557
cig:TemporaryEasementsIntangibleAssetsMember
2018-12-31
0001157557
cig:OnerousConcessionIntangibleAssetsMember
2018-12-31
0001157557
cig:AssetsOfConcessionIntangibleAssetsMember
2018-12-31
0001157557
cig:AssetsOfConcessionIntangibleAssetsMember
2019-01-01
2019-12-31
0001157557
cig:OthersIntangibleAssetsMember
2018-12-31
0001157557
cig:OthersIntangibleAssetsMember
2019-01-01
2019-12-31
0001157557
cig:UsefulLifeDefinedIntangibleAssetMember
2018-12-31
0001157557
cig:UsefulLifeDefinedIntangibleAssetMember
2019-01-01
2019-12-31
0001157557
ifrs-full:IntangibleAssetsUnderDevelopmentMember
2018-12-31
0001157557
ifrs-full:IntangibleAssetsUnderDevelopmentMember
2019-01-01
2019-12-31
0001157557
cig:SystemCableBelow69KVOneMember
cig:DistributionSegmentMember
2021-01-01
2021-12-31
0001157557
ifrs-full:ComputerSoftwareMember
cig:AdministrationMember
2021-01-01
2021-12-31
0001157557
cig:SystemCableBelow69KVTwoMember
cig:DistributionSegmentMember
2021-01-01
2021-12-31
0001157557
cig:VehiclesOneMember
cig:AdministrationMember
2021-01-01
2021-12-31
0001157557
cig:StructurePostsMember
cig:DistributionSegmentMember
2021-01-01
2021-12-31
0001157557
cig:GeneralEquipmentMember
cig:AdministrationMember
2021-01-01
2021-12-31
0001157557
cig:OverheadDistributionTransformerMember
cig:DistributionSegmentMember
2021-01-01
2021-12-31
0001157557
ifrs-full:BuildingsMember
cig:AdministrationMember
2021-01-01
2021-12-31
0001157557
cig:CircuitBreakerUpTo69KVMember
cig:DistributionSegmentMember
2021-01-01
2021-12-31
0001157557
cig:CapacitorBankUpTo69KVMember
cig:DistributionSegmentMember
2021-01-01
2021-12-31
0001157557
cig:VoltageRegulatorMember
cig:DistributionSegmentMember
2021-01-01
2021-12-31
0001157557
cig:TubingMember
cig:GasAndPowerSegmentMember
2021-01-01
2021-12-31
0001157557
cig:ComputerSoftware1Member
cig:AdministrationMember
2021-01-01
2021-12-31
0001157557
cig:BuildingsWorksAndImprovementsMember
cig:GasAndPowerSegmentMember
2021-01-01
2021-12-31
0001157557
cig:Vehicles1Member
cig:AdministrationMember
2021-01-01
2021-12-31
0001157557
cig:ImprovementsInLeasedPropertiesMember
cig:GasAndPowerSegmentMember
2021-01-01
2021-12-31
0001157557
cig:DataProcessingEquipmentMember
cig:AdministrationMember
2021-01-01
2021-12-31
0001157557
cig:MachineryAndEquipmentsMember
cig:GasAndPowerSegmentMember
2021-01-01
2021-12-31
0001157557
cig:FurnitureMember
cig:AdministrationMember
2021-01-01
2021-12-31
0001157557
cig:GasMember
2021-01-01
2021-12-31
0001157557
cig:DistributionMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoCamargosMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoItutingaMember
2021-01-01
2021-12-31
0001157557
cig:DonaRitaMember
2021-01-01
2021-12-31
0001157557
cig:ErvaliaMember
2021-01-01
2021-12-31
0001157557
cig:NeblinaMember
2021-01-01
2021-12-31
0001157557
cig:PetiMember
2021-01-01
2021-12-31
0001157557
cig:SinceridadeMember
2021-01-01
2021-12-31
0001157557
cig:TronqueirasMember
2021-01-01
2021-12-31
0001157557
cig:CajuruCemigMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoSaltoGrandeMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoSulMember
2021-01-01
2021-12-31
0001157557
cig:CoronelDomicianoMember
2021-01-01
2021-12-31
0001157557
cig:JoasalMember
2021-01-01
2021-12-31
0001157557
cig:MarmelosMember
2021-01-01
2021-12-31
0001157557
cig:PacienciaMember
2021-01-01
2021-12-31
0001157557
cig:PiauMember
2021-01-01
2021-12-31
0001157557
cig:CemigGeracaoTresMariasMember
2021-01-01
2021-12-31
0001157557
cig:CemigPocoFundoMember
2021-01-01
2021-12-31
0001157557
cig:CemigPCHPaiJoaquimMember
2021-01-01
2021-12-31
0001157557
cig:MachadoMineiroMember
2021-01-01
2021-12-31
0001157557
cig:RosalMember
2021-01-01
2021-12-31
0001157557
cig:SaCarvalhoMember
2021-01-01
2021-12-31
0001157557
cig:TotalMember
2021-01-01
2021-12-31
0001157557
cig:NovaPonteMember
2021-01-01
2021-12-31
0001157557
cig:IrapeMember
2021-01-01
2021-12-31
0001157557
cig:QueimadoMember
2021-01-01
2021-12-31
0001157557
cig:SaoBernardoCemigMember
2021-01-01
2021-12-31
0001157557
cig:EmborcacaoMember
2021-01-01
2021-12-31
0001157557
cig:TotalCemigGTMember
2021-01-01
2021-12-31
0001157557
cig:SaoSimaoMember
2021-01-01
2021-12-31
0001157557
cig:MirandaMember
2021-01-01
2021-12-31
0001157557
cig:JaguaraMember
2021-01-01
2021-12-31
0001157557
cig:VoltaGrandeMember
2021-01-01
2021-12-31
0001157557
cig:InitialApplicationMember
ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
2021-01-01
2021-12-31
0001157557
cig:InitialApplicationMember
ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember
2021-01-01
2021-12-31
0001157557
cig:InitialApplicationMember
cig:SixToTwentyYearsMember
2021-01-01
2021-12-31
0001157557
cig:Period2019To2021Member
ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
2021-01-01
2021-12-31
0001157557
cig:Period2019To2021Member
ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember
2021-01-01
2021-12-31
0001157557
cig:Period2019To2021Member
cig:FourToTwentyYearsMember
2021-01-01
2021-12-31
0001157557
cig:PeriodDecember2021Member
ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember
2021-01-01
2021-12-31
0001157557
cig:PeriodDecember2021Member
cig:SixToTenYearsMember
2021-01-01
2021-12-31
0001157557
cig:PeriodDecember2021Member
cig:ElevenToFifteenYearsMember
2021-01-01
2021-12-31
0001157557
cig:PeriodDecember2021Member
cig:SixteenToThirtyYearsMember
2021-01-01
2021-12-31
0001157557
ifrs-full:LandAndBuildingsMember
2019-12-31
0001157557
ifrs-full:VehiclesMember
2019-12-31
0001157557
ifrs-full:LandAndBuildingsMember
2020-01-01
2020-12-31
0001157557
ifrs-full:VehiclesMember
2020-01-01
2020-12-31
0001157557
ifrs-full:LandAndBuildingsMember
2020-12-31
0001157557
ifrs-full:VehiclesMember
2020-12-31
0001157557
ifrs-full:LandAndBuildingsMember
2021-01-01
2021-12-31
0001157557
ifrs-full:VehiclesMember
2021-01-01
2021-12-31
0001157557
ifrs-full:LandAndBuildingsMember
2021-12-31
0001157557
ifrs-full:VehiclesMember
2021-12-31
0001157557
ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
2021-12-31
0001157557
ifrs-full:LaterThanFiveYearsMember
2021-12-31
0001157557
cig:EnergyOnSpotMarketMember
2021-12-31
0001157557
cig:EnergyOnSpotMarketMember
2020-12-31
0001157557
cig:ChargesEnergyNetworkMember
2021-12-31
0001157557
cig:ChargesEnergyNetworkMember
2020-12-31
0001157557
cig:EnergyPurchasedForResaleMember
2021-12-31
0001157557
cig:EnergyPurchasedForResaleMember
2020-12-31
0001157557
cig:ItaipuBinacionalMember
2021-12-31
0001157557
cig:ItaipuBinacionalMember
2020-12-31
0001157557
cig:GasPurchasedForResaleMember
2021-12-31
0001157557
cig:GasPurchasedForResaleMember
2020-12-31
0001157557
cig:MaterialsAndServicesMember
2021-12-31
0001157557
cig:MaterialsAndServicesMember
2020-12-31
0001157557
cig:ICMSRelatedMattersMember
2021-12-31
0001157557
cig:ICMSRelatedMattersMember
2020-12-31
0001157557
cig:COFINSMember
2021-12-31
0001157557
cig:COFINSMember
2020-12-31
0001157557
cig:PasepMember
2021-12-31
0001157557
cig:PasepMember
2020-12-31
0001157557
cig:INSSMember
2021-12-31
0001157557
cig:INSSMember
2020-12-31
0001157557
cig:OtherTaxAuthorityMember
2021-12-31
0001157557
cig:OtherTaxAuthorityMember
2020-12-31
0001157557
cig:PasepAndCofinsMember
2021-12-31
0001157557
cig:PasepAndCofinsMember
2020-12-31
0001157557
cig:ForeignCurrencyMember
cig:BancooBrasilVariousBondMember
2021-01-01
2021-12-31
0001157557
cig:ForeignCurrencyMember
cig:BancooBrasilVariousBondMember
2020-12-31
0001157557
cig:ForeignCurrencyMember
cig:EurobondsMember
2021-01-01
2021-12-31
0001157557
cig:ForeignCurrencyMember
cig:EurobondsMember
2021-12-31
0001157557
cig:ForeignCurrencyMember
cig:EurobondsMember
2020-12-31
0001157557
cig:ForeignCurrencyMember
cig:TransactionCostsMember
2021-12-31
0001157557
cig:ForeignCurrencyMember
cig:TransactionCostsMember
2020-12-31
0001157557
cig:ForeignCurrencyMember
cig:InterestOaidInAdvanceMember
2021-12-31
0001157557
cig:ForeignCurrencyMember
cig:InterestOaidInAdvanceMember
2020-12-31
0001157557
cig:ForeignCurrencyMember
2021-12-31
0001157557
cig:ForeignCurrencyMember
2020-12-31
0001157557
cig:LocalCurrencyMember
cig:CaixaEconomicaFederalMember
2021-01-01
2021-12-31
0001157557
cig:LocalCurrencyMember
cig:CaixaEconomicaFederalMember
2020-12-31
0001157557
cig:LocalCurrencyMember
cig:CaixaEconomicaFederalOneMember
2021-01-01
2021-12-31
0001157557
cig:LocalCurrencyMember
cig:CaixaEconomicaFederalOneMember
2020-12-31
0001157557
cig:LocalCurrencyMember
cig:EletrobrasMember
2021-01-01
2021-12-31
0001157557
cig:LocalCurrencyMember
cig:EletrobrasMember
2021-12-31
0001157557
cig:LocalCurrencyMember
cig:EletrobrasMember
2020-12-31
0001157557
cig:LocalCurrencyMember
cig:SondaMember
2021-01-01
2021-12-31
0001157557
cig:LocalCurrencyMember
cig:SondaMember
2021-12-31
0001157557
cig:LocalCurrencyMember
cig:SondaMember
2020-12-31
0001157557
cig:LocalCurrencyMember
cig:DebtInBrazilianCurrencyMember
2021-12-31
0001157557
cig:LocalCurrencyMember
cig:DebtInBrazilianCurrencyMember
2020-12-31
0001157557
cig:LocalCurrencyMember
2021-12-31
0001157557
cig:LocalCurrencyMember
2020-12-31
0001157557
cig:DebenturesTihrdIssueMember
2021-01-01
2021-12-31
0001157557
cig:DebenturesTihrdIssueMember
2021-12-31
0001157557
cig:DebenturesTihrdIssueMember
2020-12-31
0001157557
cig:DebenturesSevenIssueMember
2021-01-01
2021-12-31
0001157557
cig:DebenturesSevenIssueMember
2020-12-31
0001157557
cig:DebenturesSecondSeriesIssueMember
2021-01-01
2021-12-31
0001157557
cig:DebenturesSecondSeriesIssueMember
2020-12-31
0001157557
cig:DebenturesSevenIssueFirstSeriesOneMember
2021-01-01
2021-12-31
0001157557
cig:DebenturesSevenIssueFirstSeriesOneMember
2021-12-31
0001157557
cig:DebenturesSevenIssueFirstSeriesOneMember
2020-12-31
0001157557
cig:DebenturesSevenIssueSecondSeriesOneMember
2021-01-01
2021-12-31
0001157557
cig:DebenturesSevenIssueSecondSeriesOneMember
2021-12-31
0001157557
cig:DebenturesSevenIssueSecondSeriesOneMember
2020-12-31
0001157557
cig:DebenturesFourthIssueSecondSeriesOneMember
2021-01-01
2021-12-31
0001157557
cig:DebenturesFourthIssueSecondSeriesOneMember
2021-12-31
0001157557
cig:DebenturesFourthIssueSecondSeriesOneMember
2020-12-31
0001157557
cig:DebenturesFourthIssueSecondSeriesMember
2021-01-01
2021-12-31
0001157557
cig:DebenturesFourthIssueSecondSeriesMember
2021-12-31
0001157557
cig:DebenturesFourthIssueSecondSeriesMember
2020-12-31
0001157557
cig:DebenturesFourthIssue3SeriesMember
2021-01-01
2021-12-31
0001157557
cig:DebenturesFourthIssue3SeriesMember
2021-12-31
0001157557
cig:DebenturesFourthIssue3SeriesMember
2020-12-31
0001157557
cig:DebenturesFourthIssue4SeriesMember
2021-01-01
2021-12-31
0001157557
cig:DebenturesFourthIssue4SeriesMember
2021-12-31
0001157557
cig:DebenturesFourthIssue4SeriesMember
2020-12-31
0001157557
cig:DebenturesSevenIssueSingleSeriesMember
2021-01-01
2021-12-31
0001157557
cig:DebenturesSevenIssueSingleSeriesMember
2021-12-31
0001157557
cig:DebenturesSevenIssueSingleSeriesMember
2020-12-31
0001157557
cig:DebenturesEightIssueSingleSeriesMember
2021-01-01
2021-12-31
0001157557
cig:DebenturesEightIssueSingleSeriesMember
2021-12-31
0001157557
cig:DebenturesEightIssueSingleSeriesMember
2020-12-31
0001157557
cig:DiscountOnTheIssuanceOfDebentureMember
2021-12-31
0001157557
cig:DiscountOnTheIssuanceOfDebentureMember
2020-12-31
0001157557
cig:TransactionCostsMember
2021-12-31
0001157557
cig:TransactionCostsMember
2020-12-31
0001157557
currency:BRL
2021-01-01
2021-12-31
0001157557
cig:PromissoryNotesAndSuretiesMember
2021-12-31
0001157557
cig:GuaranteeAndReceivablesMember
2021-12-31
0001157557
cig:ReceivablesMember
2021-12-31
0001157557
cig:SharesMember
2021-12-31
0001157557
cig:UnsecuredMember
2021-12-31
0001157557
currency:USD
ifrs-full:LaterThanOneMonthAndNotLaterThanThreeMonthsMember
2021-12-31
0001157557
currency:USD
ifrs-full:LaterThanThreeMonthsAndNotLaterThanSixMonthsMember
2021-12-31
0001157557
currency:USD
ifrs-full:LaterThanThreeMonthsAndNotLaterThanOneYearMember
2021-12-31
0001157557
currency:USD
ifrs-full:LaterThanSixMonthsAndNotLaterThanOneYearMember
2021-12-31
0001157557
currency:USD
ifrs-full:LaterThanOneYearMember
2021-12-31
0001157557
currency:USD
2021-12-31
0001157557
cig:TotalCurrencyDenominatedMember
ifrs-full:LaterThanOneMonthAndNotLaterThanThreeMonthsMember
2021-12-31
0001157557
cig:TotalCurrencyDenominatedMember
ifrs-full:LaterThanThreeMonthsAndNotLaterThanSixMonthsMember
2021-12-31
0001157557
cig:TotalCurrencyDenominatedMember
ifrs-full:LaterThanThreeMonthsAndNotLaterThanOneYearMember
2021-12-31
0001157557
cig:TotalCurrencyDenominatedMember
ifrs-full:LaterThanSixMonthsAndNotLaterThanOneYearMember
2021-12-31
0001157557
cig:TotalCurrencyDenominatedMember
ifrs-full:LaterThanOneYearMember
2021-12-31
0001157557
cig:TotalCurrencyDenominatedMember
2021-12-31
0001157557
cig:IPCAMember
ifrs-full:LaterThanOneMonthAndNotLaterThanThreeMonthsMember
2021-12-31
0001157557
cig:IPCAMember
ifrs-full:LaterThanThreeMonthsAndNotLaterThanSixMonthsMember
2021-12-31
0001157557
cig:IPCAMember
ifrs-full:LaterThanThreeMonthsAndNotLaterThanOneYearMember
2021-12-31
0001157557
cig:IPCAMember
ifrs-full:LaterThanSixMonthsAndNotLaterThanOneYearMember
2021-12-31
0001157557
cig:IPCAMember
ifrs-full:LaterThanOneYearMember
2021-12-31
0001157557
cig:IPCAMember
2021-12-31
0001157557
cig:UFIRRGRMember
ifrs-full:LaterThanOneMonthAndNotLaterThanThreeMonthsMember
2021-12-31
0001157557
cig:UFIRRGRMember
ifrs-full:LaterThanThreeMonthsAndNotLaterThanSixMonthsMember
2021-12-31
0001157557
cig:UFIRRGRMember
ifrs-full:LaterThanThreeMonthsAndNotLaterThanOneYearMember
2021-12-31