XML 92 R77.htm IDEA: XBRL DOCUMENT
v3.23.1

CONCESSIONS AND AUTHORIZATIONS (Details 1) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 BRL (R$) | [1]
Irape Enterprise [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Nominal value in 2022 | R$ 49 | [2]
Present value in 2022 | R$ 22 | [2]
Period of the concession | 03/2006 - 09/2037 | [2]
Updating indexer | IGPM | [2]
Queimado [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Nominal value in 2022 | R$ 11 | [3]
Present value in 2022 | R$ 6 | [3]
Period of the concession | 01/2004 - 06/2034 | [3]
Updating indexer | IGPM | [3]
[1] | During the period of the extension of the concession term, the generator will freely dispose of the energy from the undertaking, under the terms of Law 13,203/2015, with the other clauses unchanged for both contracts.
[2] | In October 2022, through the 4th amendment to Concession Agreement No. 014/2000, the term of the concession for the Irapé Hydroelectric Plant was extended, in accordance with Authoritative Resolution No. 12,255 of July 5, 2022, and ReH No. 2,932, of September 14, 2021;
[3] | In October 2022, by means of the 3rd amendment to Concession Contract 006/1997, the term of the concession for the Usina Hidrelétrica Queimado was extended, pursuant to Authoritative Resolution 11,998 of July 7, 2022, and ReH No. 2,932, of September 14, 2021;

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

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

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

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

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

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

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