XML 222 R201.htm IDEA: XBRL DOCUMENT
v3.25.1

Related Party Transactions (Details) - BRL (R$) R$ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets 1 [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Operating leasing |  |  |
Operating leasing non current | 180 |  | 185
Assets 1 [Member] | Alianca Geracao [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy |  | [1] | 3
Provision of services |  |  | 1
Provision of legal services |  | [2] |
Assets 1 [Member] | Guanhaes [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Provision of services |  |  |
Assets 1 [Member] | Guanhaes Energia S A [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Provision of legal services |  | [3] |
Assets 1 [Member] | Norte Energia [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy |  |  |
Transmission charges | 9 |  | 3
Assets 1 [Member] | Paracambi [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy |  |  |
Provision of services |  |  |
Assets 1 [Member] | Hidreletrica pipoca [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy |  |  |
Assets 1 [Member] | Taesa [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy |  |  |
Connection charges |  |  |
Transmission charges |  |  |
Provision of services | 1 |  |
Interest on Equity, and dividends | 111 |  | 49
Assets 1 [Member] | Alianca [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transmission charges |  |  |
Assets 1 [Member] | Cemig D [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Provision of legal services |  |  |
Assets 1 [Member] | Governo do Estado de Minas Gerais [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Customers and traders | 11 |  | 45
Accounts Receivable | 13 |  | 13
Provision of legal services | 27 |  |
Assets 1 [Member] | F I C Pampulha [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Cash and cash equivalents | 159 |  | 351
Marketable securities | 357 |  | 771
Marketable securities non current | 135 |  |
Assets 1 [Member] | Forluz [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Post-employment obligations |  | [4] |
Supplementary pension contributions - Defined contribution plan |  | [5] |
Administrative running costs |  | [6] |
Post-employment obligations |  |  |
Assets 1 [Member] | C E M I G Saude [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Health plan and dental plan current |  | [7] |
Health plan and dental plan non current |  |  |
Liabilities 1 [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Operating leasing | 19 |  | 27
Operating leasing non current | 195 |  | 187
Liabilities 1 [Member] | Alianca Geracao [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy |  |  | 22
Provision of services |  |  |
Provision of legal services |  |  | 58
Liabilities 1 [Member] | Guanhaes [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Provision of services |  |  |
Liabilities 1 [Member] | Guanhaes Energia S A [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Provision of legal services | 17 |  |
Liabilities 1 [Member] | Norte Energia [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy | 33 |  | 31
Transmission charges |  |  |
Liabilities 1 [Member] | Paracambi [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy | 3 |  | 2
Provision of services |  |  |
Liabilities 1 [Member] | Hidreletrica pipoca [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy | 4 |  | 3
Liabilities 1 [Member] | Taesa [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy |  |  |
Connection charges |  |  |
Transmission charges | 11 |  | 12
Provision of services |  |  |
Interest on Equity, and dividends |  |  |
Liabilities 1 [Member] | Alianca [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transmission charges |  |  |
Liabilities 1 [Member] | Cemig D [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Provision of legal services | 10 |  |
Liabilities 1 [Member] | Governo do Estado de Minas Gerais [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Customers and traders |  |  |
Accounts Receivable |  |  |
Provision of legal services |  |  |
Liabilities 1 [Member] | F I C Pampulha [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Cash and cash equivalents |  |  |
Marketable securities |  |  |
Marketable securities non current |  |  |
Liabilities 1 [Member] | Forluz [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Post-employment obligations | 53 |  | 126
Supplementary pension contributions - Defined contribution plan |  |  |
Administrative running costs |  |  |
Post-employment obligations | 1,648 |  | 2,230
Liabilities 1 [Member] | C E M I G Saude [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Health plan and dental plan current | 208 |  | 230
Health plan and dental plan non current | 2,396 |  | 2,830
Revenue 1 [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Operating leasing |  |  |
Operating leasing non current |  |  |
Revenue 1 [Member] | Alianca Geracao [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy | 33 |  | 49
Provision of services | 9 |  | 7
Provision of legal services |  |  |
Revenue 1 [Member] | Guanhaes [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Provision of services | 2 |  |
Revenue 1 [Member] | Guanhaes Energia S A [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Provision of legal services |  |  |
Revenue 1 [Member] | Norte Energia [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy |  |  |
Transmission charges | 33 |  | 30
Revenue 1 [Member] | Paracambi [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy |  |  |
Provision of services | 1 |  |
Revenue 1 [Member] | Hidreletrica pipoca [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy |  |  | 2
Revenue 1 [Member] | Taesa [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy |  |  |
Connection charges |  |  |
Transmission charges |  |  |
Provision of services | 2 |  | 2
Interest on Equity, and dividends |  |  |
Revenue 1 [Member] | Alianca [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transmission charges | 1 |  | 1
Revenue 1 [Member] | Cemig D [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Provision of legal services |  |  |
Revenue 1 [Member] | Governo do Estado de Minas Gerais [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Customers and traders | 231 |  | 194
Accounts Receivable |  |  |
Provision of legal services |  |  |
Revenue 1 [Member] | F I C Pampulha [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Cash and cash equivalents |  |  |
Marketable securities | 16 |  | 51
Marketable securities non current |  |  |
Revenue 1 [Member] | Forluz [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Post-employment obligations |  |  |
Supplementary pension contributions - Defined contribution plan |  |  |
Administrative running costs |  |  |
Post-employment obligations |  |  |
Revenue 1 [Member] | C E M I G Saude [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Health plan and dental plan current |  |  |
Health plan and dental plan non current |  |  |
Expenses 1 [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Operating leasing | (25) |  | (33)
Operating leasing non current |  |  |
Expenses 1 [Member] | Alianca Geracao [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy | (138) |  | (234)
Provision of services |  |  |
Provision of legal services |  |  | (3)
Expenses 1 [Member] | Guanhaes [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Provision of services |  |  |
Expenses 1 [Member] | Guanhaes Energia S A [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Provision of legal services |  |  |
Expenses 1 [Member] | Norte Energia [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy | (290) |  | (278)
Transmission charges |  |  |
Expenses 1 [Member] | Paracambi [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy | (31) |  | (30)
Provision of services |  |  |
Expenses 1 [Member] | Hidreletrica pipoca [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy | (46) |  | (47)
Expenses 1 [Member] | Taesa [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transactions with energy | (1) |  |
Connection charges | (5) |  | (6)
Transmission charges | (146) |  | (138)
Provision of services |  |  |
Interest on Equity, and dividends |  |  |
Expenses 1 [Member] | Alianca [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Transmission charges |  |  |
Expenses 1 [Member] | Cemig D [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Provision of legal services |  |  |
Expenses 1 [Member] | Governo do Estado de Minas Gerais [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Customers and traders |  |  |
Accounts Receivable |  |  |
Provision of legal services |  |  |
Expenses 1 [Member] | F I C Pampulha [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Cash and cash equivalents |  |  |
Marketable securities |  |  |
Marketable securities non current |  |  |
Expenses 1 [Member] | Forluz [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Post-employment obligations | (214) |  | (280)
Supplementary pension contributions - Defined contribution plan | (89) |  | (81)
Administrative running costs | (40) |  | (40)
Post-employment obligations |  |  |
Expenses 1 [Member] | C E M I G Saude [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Health plan and dental plan current | (274) |  | (388)
Health plan and dental plan non current |  |  |
[1] | This company was a Related Party of the Company until August 13, 2024, when the process of its sale to Vale S.A. was completed. For more details see Note 31.
[2] | Refers to contractual obligations towards the investee Aliança Geração corresponding to contingencies that have as triggering events that occurred before the closing of the transaction that resulted in the contribution of assets by Cemig and Vale S.A. to the capital of this investee. On March 27, 2024, the CCVA was signed to sell the interest held by the Company in the share capital of Aliança Geração to Vale S.A.. On August 13, 2024, with the completion of the sale, Vale S.A. and Cemig GT jointly signed an agreement to terminate and discharge these contingencies, which resulted in the provision being reversed in August 2024.
[3] | This refers to the agreement signed between the State of Minas Gerais, Cemig, Alpargatas, Guanhães and Cemig D. On December 21, 2012, the State of Minas Gerais signed Contract 021/2012 for execution of certain works and services in energy infrastructure in the state of Minas Gerais, and contracted Cemig for execution of the works.
[4] | Forluz's contracts are adjusted by the Broad National Consumer Price Index - IPCA of the Brazilian Institute of Geography and Statistics - IBGE, plus interest of 6% per year and will be amortized until 2031;
[5] | Company's contributions to the Pension Fund regarding the employees participating in the Mixed Plan and calculated over monthly remunerations in conformity with the Fund's regulation;
[6] | Funds for the annual administrative funding of the Pension Fund in accordance with the specific legislation for the sector. The amounts are estimated as a percentage of the Company's payroll;
[7] | Post-employment obligations related to the employees' health and dental plan.

X
- Definition Accounts receivable. + References No definition available. + Details
Name: | cig_AccountsReceivable
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Administrative Running Costs + References No definition available. + Details
Name: | cig_AdministrativeRunningCosts
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cash And Cash Equivalents 1 + References No definition available. + Details
Name: | cig_CashAndCashEquivalents1
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Connection charges. + References No definition available. + Details
Name: | cig_ConnectionCharges
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Customers And Traders + References No definition available. + Details
Name: | cig_CustomersAndTraders
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Health Plan And Dental Plan Current + References No definition available. + Details
Name: | cig_HealthPlanAndDentalPlanCurrent
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Health Plan And Dental Plan Non Current + References No definition available. + Details
Name: | cig_HealthPlanAndDentalPlanNonCurrent
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Interest On Equity And Dividends + References No definition available. + Details
Name: | cig_InterestOnEquityAndDividends
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Marketable Securities 1 + References No definition available. + Details
Name: | cig_MarketableSecurities1
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Marketable Securities Non Current 1 + References No definition available. + Details
Name: | cig_MarketableSecuritiesNonCurrent1
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Operating Leasing + References No definition available. + Details
Name: | cig_OperatingLeasing
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Operating Leasing Non Current + References No definition available. + Details
Name: | cig_OperatingLeasingNonCurrent
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Postemployment Obligation 1 + References No definition available. + Details
Name: | cig_PostemploymentObligation1
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Postemployment Obligations Non Current + References No definition available. + Details
Name: | cig_PostemploymentObligationsNonCurrent
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Provision of legal services. + References No definition available. + Details
Name: | cig_ProvisionOfLegalServices
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Provision Of Services 1 + References No definition available. + Details
Name: | cig_ProvisionOfServices1
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Supplementary Pension Contributions Defined Contribution Plan + References No definition available. + Details
Name: | cig_SupplementaryPensionContributionsDefinedContributionPlan
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Transactions with energy. + References No definition available. + Details
Name: | cig_TransactionsWithEnergy
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Transmission charges. + References No definition available. + Details
Name: | cig_TransmissionCharges
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | cig_ClassesOfAssetsAndLiabilitiesAxis=cig_Assets1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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

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

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

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

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

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

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

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

X
- Details
Name: | cig_ClassesOfAssetsAndLiabilitiesAxis=cig_Liabilities1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cig_ClassesOfAssetsAndLiabilitiesAxis=cig_Revenue1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cig_ClassesOfAssetsAndLiabilitiesAxis=cig_Expenses1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |