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v3.25.1

Concessions and Authorizations - Schedule of Average Effect on Consumers (Details) |  | 12 Months Ended
--- | --- | ---
May 21, 2024 | Dec. 31, 2024
IfrsStatementLineItems [Line Items] |  |
Average Tariff Adjustment | 7.32% | 7.32%
High and Medium Voltage - Group A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Average Tariff Adjustment | 8.63% | 8.63%
Low Voltage - Group B [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Average Tariff Adjustment |  | 6.72%

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- Definition Average tariff adjustment. + References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |