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Regulatory charges -Schedule of Information about Amounts Recognised in relation to Regulatory Deferral Account Balances (Details) - BRL (R$) R$ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Liabilities |  |  |
Global Reversion Reserve (RGR) | R$ 28 |  | R$ 28
Energy Development Account (CDE) | 76 |  | 133
Grantor inspection fee - Aneel | 4 |  | 3
Energy Efficiency Program | 188 |  | 187
Research and development (R&D) | 146 |  | 150
Energy System Expansion Research | 5 |  | 5
National Scientific and Technological Development Fund | 10 |  | 9
Proinfa - Alternative Energy Program | 9 |  | 9
Royalties for use of water resources | 12 |  | 11
Emergency capacity charge | 26 |  | 26
CDE on R&D (1) | 3 | [1] | 3
CDE on EEP | 5 |  | 8
Others | 4 |  | 5
Liability | 516 |  | 577
Current liabilities | 344 |  | 487
Non-current liabilities | R$ 172 |  | R$ 90
[1] | As per Aneel Dispatch 3,056 of October 9, 2024, the monthly installments of Cemig D’s charges related to the Covid and Water Scarcity accounts of the CDE (Conta de Desenvolvimento Energético) are no longer charged, since both accounts have been fully paid.

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- Definition Aneel inspection charge. + References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Cde On Eep + References No definition available. + Details
Name: | cig_CdeOnEep
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Cde On Rd 1 + References No definition available. + Details
Name: | cig_CdeOnRd1
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Current regulatory liability. + References No definition available. + Details
Name: | cig_CurrentRegulatoryLiability
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Emergency capacity charge. + References No definition available. + Details
Name: | cig_EmergencyCapacityCharge
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Energy development account. + References No definition available. + Details
Name: | cig_EnergyDevelopmentAccount
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Energy efficiency program. + References No definition available. + Details
Name: | cig_EnergyEfficiencyProgram
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Energy system expansion research. + References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Global reversion reserve. + References No definition available. + Details
Name: | cig_GlobalReversionReserve
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition National scientific and technological development fund. + References No definition available. + Details
Name: | cig_NationalScientificAndTechnologicalDevelopmentFund
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Noncurrent regulatory liability. + References No definition available. + Details
Name: | cig_NoncurrentRegulatoryLiability
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other current regulatory liability. + References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Proinfa alternative energy program. + References No definition available. + Details
Name: | cig_ProinfaAlternativeEnergyProgram
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Research And Development Expense 1 + References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Royalties for use of water resources. + References No definition available. + Details
Name: | cig_RoyaltiesForUseOfWaterResources
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of regulatory deferral account credit balances and the related deferred tax liability. [Refer: Regulatory deferral account credit balances; Deferred tax liability associated with regulatory deferral account balances] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 14 -IssueDate 2024-01-01 -Paragraph 24 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=14&code=ifrs-tx-2024-en-r&anchor=para_24&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 14 -IssueDate 2024-01-01 -Paragraph B11 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=14&code=ifrs-tx-2024-en-r&anchor=para_B11_a&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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