XML 124 R110.htm IDEA: XBRL DOCUMENT
v3.23.2

INVESTMENTS (Details) - BRL (R$) R$ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
IfrsStatementLineItems [Line Items] |  |  |
Total investments |  | R$ 5,107 | R$ 4,923
C E M I G Geracaoe Transmissao [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control |  | Controlled |
Guanhaes Energia [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control |  | Jointly controlled |
Total investments |  | R$ 183 | 125
Hidreletrica cachoeirao [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control |  | Jointly controlled |
Total investments |  | R$ 47 | 59
Hidreletrica pipoca [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control |  | Jointly controlled |
Total investments |  | R$ 47 | 47
Madeira energia (santo antonio plant) [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control | [1] | Affiliated |
Total investments | [1] | R$ 10 |
Fip Melbourne [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control | [1] | Affiliated |
Total investments | [1] | R$ 8 |
Retiro Baixo [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control |  | Jointly controlled |
Total investments |  | R$ 185 | 201
Alianca norte (belo monte plant) [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control | [2] | Jointly controlled |
Total investments | [2] | R$ 576 | 609
Baguari Energia [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control |  | Jointly controlled |
Total investments |  | R$ 160 | 168
Alianca Geracao [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control |  | Jointly controlled |
Total investments |  | R$ 1,194 | 1,141
Amazonia Energia [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control | [2] | Jointly controlled |
Total investments | [2] | R$ 886 | 933
Paracambi Energetica [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control | [3] | Jointly controlled |
Total investments | [3] | R$ 134 | 124
Taesa [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control |  | Jointly controlled |
Total investments |  | R$ 1,549 | 1,580
Ativas Data Center [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control | [4] | Affiliated |
Total investments | [4] |  | 16
C E M I G Sim [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control |  | Controlled |
U F V S [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control | [5] | Jointly controlled |
Total investments | [5] | R$ 128 | 99
Axxiom [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control | [6] | Jointly controlled |
Total investments | [6] |  | 4
Total of investments [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Total investments |  | R$ 5,107 | 5,106
Itaocara [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control | [7] | Jointly controlled |
Total investments | [7] |  | (21)
Usinade Santo Antonio [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control | [8] | Affiliated |
Total investments | [8] |  | R$ (162)
[1] | Indirect interest in the Santo Antônio plant through these investees.
[2] | Indirect interest in the Belo Monte plant through these investees.
[3] | On November 8, 2022, the investee's Extraordinary General Assembly approved the amendment of the bylaws that changed its corporate name to ‘Paracambi Energética S.A.’.
[4] | On November 16, 2022, the Company entered into a share purchase and sale agreement and other agreements for the sale of 19.6% of its equity interest in Ativas Data Center S.A. (‘Ativas’) to Sonda Procwork Informática Ltda. On December 28, 2022, the Company concluded the sale of all its equity interest held in Ativas to Sonda. More details in Note 32.
[5] | Set of photovoltaics bussiness, in which the investee CEMIG Sim has a interest.
[6] | On December 22, 2022, the Company entered into a stock purchase and other agreement (‘CCVA’) for the sale of 49% of its interest in Axxiom Soluções Tecnológicas S.A. (‘Axxiom’) to Light S.A. (‘Light’), which holds 51.0% of the remaining interest. More details in Note 32.
[7] | The jointly controlled entity Usina Hidrelétrica Itaocara had negative shareholders’ equity. Thus, after reducing the book value of its interest to zero, the Company recognized the loss to the extent that it assumed contractual obligations with the jointly controlled entity and the other shareholders, which on September 30, 2022 is R$14 (R$21 on December 31, 2021). In the 4th quarter of 2022, the Company made an investment in this investee in the amount of R$25, corresponding to the portion of 49% of the penalty applied by ANEEL, related to the discharge of the guarantee of faithful performance, due to the failure to implement UHE Itaocara I. With this, the provision referring to the Company's contractual obligations to the invested company and the other shareholders was reverted. Additionally, ANEEL recommended to MME the termination, upon request, of the concession of UHE Itaocara through the rescission of Concession Contract 001/2015. Given the non-recoverability of the investment, the Company recognized an impairment loss presented in the Statement of Income under Other operating expenses.
[8] | In June 2022, the provision related to the Company's contractual obligations assumed with the investee and the other shareholders was reversed. Further details are disclosed in this note.

X
- References No definition available. + Details
Name: | cig_IfrsStatementLineItems
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Investments in associates accounted for using equity method gross + References No definition available. + Details
Name: | cig_InvestmentsInAssociatesAccountedForUsingEquityMethodGross
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The description of how the acquirer obtained the power to govern the financial and operating policies of the acquiree so as to obtain benefits from its activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2022-03-24 -Paragraph B64 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2022-en-r&anchor=para_B64_d&doctype=Appendix&subtype=B -URIDate 2022-03-24 + Details
Name: | ifrs-full_DescriptionOfHowAcquirerObtainedControlOfAcquiree
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_CEMIGGeracaoeTransmissaoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_GuanhaesEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_HidreletricaCachoeiraoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_HidreletricaPipocaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_MadeiraEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_FipMelbourneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_RetiroBaixoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_AliancaNorteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_BaguariEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_AliancaGeracaoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_AmazoniaEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_ParacambiEnergeticaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_TaesaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_AtivasDataCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_CEMIGSimMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_UFVSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_AxxiomMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_InvestmentsPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_ItaocaraMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_UsinadeSantoAntonioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |