XML 64 R85.htm IDEA: XBRL DOCUMENT
v3.20.1

4. CONCESSIONS AND AUTHORIZATIONS (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Gasmig | [1],[2]
Concession or authorization contract | State Law 11,021/1993 | [1],[2]
Expiration date | 01/2053 | [1],[2]
Energy Purchased For Resale [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig D | [1]
Concession or authorization contract | 002/1997 003/1997 004/1997 005/1997 | [1]
Expiration date | 12/2045 | [1]
National Grid [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig GT | [3]
Concession or authorization contract | 006/1997 | [3]
Expiration date | 01/2043 | [3]
Substation - SE Itajub [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig GT | [3]
Concession or authorization contract | 79/2000 | [3]
Expiration date | 10/2030 | [3]
Central Geradora Elica Volta Do Rio Wind Power Plants [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Volta do Rio | [4]
Concession or authorization contract | Resolution 660/2001 | [4]
Expiration date | 01/2031 | [4]
Central Geradora Elica Praias De Parajuru Wind Power Plants [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Parajuru | [4]
Concession or authorization contract | Resolution 526/2002 | [4]
Expiration date | 09/2032 | [4]
Sa Carvalho Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Sa Carvalho | [5]
Concession or authorization contract | 01/2004 | [5]
Expiration date | 12/2024 | [5]
Igarape Thermal Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig GT | [5],[6]
Concession or authorization contract | 07/1997 | [5],[6]
Expiration date | 08/2024 | [5],[6]
Nova Ponte Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig GT | [5]
Concession or authorization contract | 07/1997 | [5]
Expiration date | 07/2025 | [5]
Queimado hydroelectric plants [member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig GT | [5]
Concession or authorization contract | 06/1997 | [5]
Expiration date | 01/2033 | [5]
Irape Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig GT | [5]
Concession or authorization contract | 14/2000 | [5]
Expiration date | 02/2035 | [5]
Itutinga Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig Geracao Itutinga | [7]
Concession or authorization contract | 10/2016 | [7]
Expiration date | 01/2046 | [7]
Salto Grande Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig Geracao Salto Grande | [7]
Concession or authorization contract | 09/2016 | [7]
Expiration date | 01/2046 | [7]
Emborcacao Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig GT | [5]
Concession or authorization contract | 07/1997 | [5]
Expiration date | 07/2025 | [5]
Camargos Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig Geracao Camargos | [7]
Concession or authorization contract | 11/2016 | [7]
Expiration date | 01/2046 | [7]
Salto Voltao Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Horizontes Energia |
Concession or authorization contract | Resolution 331/2002 |
Expiration date | 10/2030 |
Cajuru Gafan Hoto and Martins Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig Geracao Oeste | [7]
Concession or authorization contract | 16/2016 | [7]
Expiration date | 01/2046 | [7]
Dona Rita Ervalia Neblina Peti Sinceridade And Tronqueiras Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig Geracao Leste | [7]
Concession or authorization contract | 14/2016 and 15/2016 | [7]
Expiration date | 01/2046 | [7]
Coronel Domiciano Joasal Marmelos Paciencia E Piau Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig Geracao Sul | [7]
Concession or authorization contract | 12/2016 and 13/2016 | [7]
Expiration date | 01/2046 | [7]
Xicao Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig GT | [5]
Concession or authorization contract | 02/2013 | [5]
Expiration date | 08/2025 | [5]
Sao Bernardo Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig GT | [5]
Concession or authorization contract | 02/2013 | [5]
Expiration date | 08/2025 | [5]
Poco Fundo Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig GT | [5]
Concession or authorization contract | 02/2013 | [5]
Expiration date | 08/2025 | [5]
Luiz Dias Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig GT | [5]
Concession or authorization contract | 02/2013 | [5]
Expiration date | 08/2025 | [5]
Rio De Pedras Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig GT | [5]
Concession or authorization contract | 02/2013 | [5]
Expiration date | 09/2024 | [5]
Salto morais hydroelectric plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig GT | [5]
Concession or authorization contract | 02/2013 | [5]
Expiration date | 07/2020 | [5]
Salto Do Passo Velho Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Horizontes Energia | [5]
Concession or authorization contract | Resolution 331/2002 | [5]
Expiration date | 10/2030 | [5]
PCH Pai Joaquim Hydro Electric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig PCH | [5]
Concession or authorization contract | Authorizing Resolution 377/2005 | [5]
Expiration date | 04/2032 | [5]
Salto Paraopeba Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Horizontes Energia | [5]
Concession or authorization contract | Resolution 331/2002 | [5]
Expiration date | 10/2030 | [5]
Machado Mineiro Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Horizontes Energia | [5]
Concession or authorization contract | Resolution 331/2002 | [5]
Expiration date | 07/2025 | [5]
Rosal Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Rosal Energia | [5]
Concession or authorization contract | 01/1997 | [5]
Expiration date | 05/2032 | [5]
Santa Luzia Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig GT | [5]
Concession or authorization contract | 07/1997 | [5]
Expiration date | 02/2026 | [5]
Tres Marias Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
Disclosure Of Electricity Concessions And Authorizations [line items] |  |
Company holding concession or authorization | Cemig Geracao Tres Marias | [7]
Concession or authorization contract | 08/2016 | [7]
Expiration date | 01/2046 | [7]
[1] | Concession contracts that are within the scope of IFRIC 12 and under which the concession infrastructure assets are recorded under the intangible and financial assets bifurcation model, and in compliance with IFRS 15, the infrastructure under construction has been classified as a contract asset. Despite the segregation of distribution concession contract into four regions of State of Minas Gerais, its terms and conditions are the same.
[2] | On September 19, 2019, Gasmig executed with the State of Minas Gerais, as Granting Authority, the Third Amendment to the Concession Agreement, assuring Gasmig the extension of its concession term until 2053. For further information, please see Note 20 - Intangible Assets.
[3] | These refer to transmission concession contracts, for which a contract asset was recognized upon the application of IFRS 15, for being subject to satisfaction of performance obligations.
[4] | This refers to concessions, given by the process of authorization, for generation, as an independent power producer, of wind power, sold under the Proinfa program. The assets tied to the right of commercial operation are recorded in PP&E. The rights of authorization of commercial operation that are classified as an Intangible.
[5] | Generation concession contracts that are not within the scope of IFRIC 12, whose infrastructure assets are recorded as PP&E since the concession grantor does not have control over whom the service is provided to as the output is being sold mainly in the Free Market ('ACL').
[6] | On December 6, 2019, Aneel suspended Igarape Plant commercial operation upon Cemig GT's claim for early termination of its concession contract.
[7] | Generation concession contracts within the scope of IFRIC 12, under which Cemig has the right to receive cash and therefore, recognizes a concession financial assets.

X
- Definition Date of electricity distribution concessions and authorizations. + References No definition available. + Details
Name: | cig_DateOfElectricityDistributionConcessionsAndAuthorizations
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date of electricity generation concessions and authorizations. + References No definition available. + Details
Name: | cig_DateOfElectricityGenerationConcessionsAndAuthorizations
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date of electricity transmission concessions and authorizations. + References No definition available. + Details
Name: | cig_DateOfElectricityTransmissionConcessionsAndAuthorizations
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date of gas distribution concessions and authorizations. + References No definition available. + Details
Name: | cig_DateOfGasDistributionConcessionsAndAuthorizations
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of electricity concessions and authorizations. + References No definition available. + Details
Name: | cig_DisclosureOfElectricityConcessionsAndAuthorizationsLineItems
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Electricity distribution concessions and authorizations expiration date. + References No definition available. + Details
Name: | cig_ElectricityDistributionConcessionsAndAuthorizationsExpirationDate
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Electricity distribution concessions and authorizations name of company. + References No definition available. + Details
Name: | cig_ElectricityDistributionConcessionsAndAuthorizationsNameOfCompany
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Electricity generation concessions and authorizations expiration date. + References No definition available. + Details
Name: | cig_ElectricityGenerationConcessionsAndAuthorizationsExpirationDate
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Electricity generation concessions and authorizations name of company. + References No definition available. + Details
Name: | cig_ElectricityGenerationConcessionsAndAuthorizationsNameOfCompany
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Electricity transmission concessions and authorizations expiration date. + References No definition available. + Details
Name: | cig_ElectricityTransmissionConcessionsAndAuthorizationsExpirationDate
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Electricity transmission concessions and authorizations name of company. + References No definition available. + Details
Name: | cig_ElectricityTransmissionConcessionsAndAuthorizationsNameOfCompany
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Gas distribution concessions and authorizations expiration date. + References No definition available. + Details
Name: | cig_GasDistributionConcessionsAndAuthorizationsExpirationDate
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Gas distribution concessions and authorizations name of company. + References No definition available. + Details
Name: | cig_GasDistributionConcessionsAndAuthorizationsNameOfCompany
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_EnergyDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_NationalGridMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_SubstationSeItajubMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_CentralGeradoraElicaVoltaDoRioWindPowerPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_CentralGeradoraElicaPraiasDeParajuruWindPowerPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_SaCarvalhoHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_NationalElectricalEnergyAgencyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_IgarapeThermalPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_NovaPonteHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_QueimadoHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_IrapeHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_ItutingaHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_SaltoGrandeHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_EmborcacaoHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_CamargosHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_SaltoVoltaoHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_CajuruGafanhotoAndMartinsHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_DonaRitaErvaliaNeblinaPetiSinceridadeAndTronqueirasHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_CoronelDomicianoJoasalMarmelosPacienciaEPiauHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_XicaoHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_SaoBernardoHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_PocoFundoHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_LuizDiasHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_RioDePedrasHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_SaltoMoraisHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_SaltoDoPassoVelhoHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_PchPaiJoaquimHydroElectricPlantsMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_SaltoParaopebaHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_MachadoMineiroHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_RosalHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_SantaLuziaHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_TresMariasHydroelectricPlantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |