XML 147 R126.htm IDEA: XBRL DOCUMENT
v3.25.1

Property, Plant and Equipment - Schedule of Movement in Property, Plant and Equipment (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | R$ 3,256 | R$ 2,411 |  | R$ 2,419 |
Depreciation |  | (172) | (170) |  | (172) |
Property plant and equipment, Ending balance |  | 584 | 3,256 |  |  |
Property plant and equipment, Beginning balance |  | 3,256 |  |  |  |
Additions |  |  | 1,006 |  | 176 |
Business Combination |  | 87 | 70 |  |  |
Disposals - Assets classified as held for sale |  | (21) | (58) |  | (12) |
Disposals |  | (19) | (3) |  |  |
Transfers / Capitalizations |  |  |  |  |  |
Property plant and equipment, Ending balance |  | 3,715 | 3,256 |  | 2,411 |
Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | 2,049 | 2,031 |  | 2,113 |
Depreciation |  | (172) | (170) |  | (172) |
Property plant and equipment, Ending balance |  | 3 | 2,049 |  |  |
Property plant and equipment, Beginning balance |  | 2,049 |  |  |  |
Additions |  |  | 1 |  |  |
Business Combination |  | 87 | 70 |  |  |
Disposals - Assets classified as held for sale |  | (13) | (58) |  | (12) |
Disposals |  | (2) | (1) |  |  |
Transfers / Capitalizations |  | 107 | 176 |  | 102 |
Property plant and equipment, Ending balance |  | 2,059 | 2,049 |  | 2,031 |
Investment property under construction or development [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | 1,207 | 380 |  | 306 |
Depreciation |  |  |  |  |  |
Property plant and equipment, Ending balance |  |  | 1,207 |  |  |
Property plant and equipment, Beginning balance |  | 1,207 |  |  |  |
Additions |  | 581 | 1,005 |  | 176 |
Business Combination |  |  |  |  |  |
Disposals - Assets classified as held for sale |  | (8) |  |  |  |
Disposals |  | (17) | (2) |  |  |
Transfers / Capitalizations |  | (107) | (176) |  | (102) |
Property plant and equipment, Ending balance |  | 1,656 | 1,207 |  | 380 |
Land [member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | 214 | 217 | [1] | 220 | [2]
Depreciation |  | (3) | (3) |  | (3) |
Property plant and equipment, Ending balance | [3] |  | 214 |  |  |
Property plant and equipment, Beginning balance | [3] | 214 |  |  |  |
Additions |  | 2 |  |  |  |
Business Combination |  |  |  |  |  |
Disposals - Assets classified as held for sale |  |  | (2) |  |  |
Disposals |  | (1) |  |  |  |
Transfers / Capitalizations |  | 1 | 2 |  |  |
Property plant and equipment, Ending balance |  | 213 | 214 |  | 217 | [1]
Reservoirs, dams and watercourses [member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | 853 | 870 |  | 944 |
Depreciation |  | (80) | (79) |  | (81) |
Property plant and equipment, Ending balance |  |  | 853 |  |  |
Property plant and equipment, Beginning balance |  | 853 |  |  |  |
Additions |  |  |  |  |  |
Business Combination |  |  |  |  |  |
Disposals - Assets classified as held for sale |  | (7) | (22) |  |  |
Disposals |  | (1) |  |  |  |
Transfers / Capitalizations |  | 54 | 84 |  | 7 |
Property plant and equipment, Ending balance |  | 819 | 853 |  | 870 |
Buildings Works and Improvements [Member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | 227 | 233 |  | 248 |
Depreciation |  | (17) | (17) |  | (17) |
Property plant and equipment, Ending balance |  |  | 227 |  |  |
Property plant and equipment, Beginning balance |  | 227 |  |  |  |
Additions |  |  |  |  |  |
Business Combination |  |  |  |  |  |
Disposals - Assets classified as held for sale |  | (1) | (5) |  |  |
Disposals |  |  |  |  |  |
Transfers / Capitalizations |  | 3 | 16 |  | 2 |
Property plant and equipment, Ending balance |  | 212 | 227 |  | 233 |
Machinery and equipment [member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | 748 | 706 |  | 697 |
Depreciation |  | (71) | (69) |  | (70) |
Property plant and equipment, Ending balance |  |  | 748 |  |  |
Property plant and equipment, Beginning balance |  | 748 |  |  |  |
Additions |  | 1 | 1 |  |  |
Business Combination |  | 87 | 70 |  |  |
Disposals - Assets classified as held for sale |  | (5) | (29) |  | (12) |
Disposals |  |  | (1) |  |  |
Transfers / Capitalizations |  | 48 | 70 |  | 91 |
Property plant and equipment, Ending balance |  | 808 | 748 |  | 706 |
Vehicle [Member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | 4 | 2 |  | 1 |
Depreciation |  | (1) | (2) |  | (1) |
Property plant and equipment, Ending balance |  |  | 4 |  |  |
Property plant and equipment, Beginning balance |  | 4 |  |  |  |
Additions |  |  |  |  |  |
Business Combination |  |  |  |  |  |
Disposals - Assets classified as held for sale |  |  |  |  |  |
Disposals |  |  |  |  |  |
Transfers / Capitalizations |  | 1 | 4 |  | 2 |
Property plant and equipment, Ending balance |  | 4 | 4 |  | 2 |
Furniture and utensils [member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | 3 | 3 |  | 3 |
Depreciation |  |  |  |  |  |
Property plant and equipment, Ending balance |  |  | 3 |  |  |
Property plant and equipment, Beginning balance |  | 3 |  |  |  |
Additions |  |  |  |  |  |
Business Combination |  |  |  |  |  |
Disposals - Assets classified as held for sale |  |  |  |  |  |
Disposals |  |  |  |  |  |
Transfers / Capitalizations |  |  |  |  |  |
Property plant and equipment, Ending balance |  | 3 | 3 |  | R$ 3 |
Gross carrying amount [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | 8,731 |  |  |  |
Property plant and equipment, Ending balance |  | 9,324 | 8,731 |  |  |
Gross carrying amount [member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | 7,524 |  |  |  |
Property plant and equipment, Ending balance |  | 7,668 | 7,524 |  |  |
Gross carrying amount [member] | Investment property under construction or development [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | 1,207 |  |  |  |
Property plant and equipment, Ending balance |  | 1,656 | 1,207 |  |  |
Gross carrying amount [member] | Land [member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | 247 |  |  |  |
Property plant and equipment, Ending balance |  | 249 | 247 |  |  |
Gross carrying amount [member] | Reservoirs, dams and watercourses [member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | 3,323 |  |  |  |
Property plant and equipment, Ending balance |  | 3,339 | 3,323 |  |  |
Gross carrying amount [member] | Buildings Works and Improvements [Member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | 1,095 |  |  |  |
Property plant and equipment, Ending balance |  | 1,095 | 1,095 |  |  |
Gross carrying amount [member] | Machinery and equipment [member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | 2,826 |  |  |  |
Property plant and equipment, Ending balance |  | 2,951 | 2,826 |  |  |
Gross carrying amount [member] | Vehicle [Member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | 19 |  |  |  |
Property plant and equipment, Ending balance |  | 20 | 19 |  |  |
Gross carrying amount [member] | Furniture and utensils [member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | 14 |  |  |  |
Property plant and equipment, Ending balance |  | 14 | 14 |  |  |
Accumulated depreciation and amortisation [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | (5,475) |  |  |  |
Property plant and equipment, Ending balance |  | (5,609) | (5,475) |  |  |
Accumulated depreciation and amortisation [member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | (5,475) |  |  |  |
Property plant and equipment, Ending balance |  | (5,609) | (5,475) |  |  |
Accumulated depreciation and amortisation [member] | Investment property under construction or development [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  |  |  |  |  |
Property plant and equipment, Ending balance |  |  |  |  |  |
Accumulated depreciation and amortisation [member] | Land [member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | (33) |  |  |  |
Property plant and equipment, Ending balance |  | (36) | (33) |  |  |
Accumulated depreciation and amortisation [member] | Reservoirs, dams and watercourses [member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | (2,470) |  |  |  |
Property plant and equipment, Ending balance |  | (2,520) | (2,470) |  |  |
Accumulated depreciation and amortisation [member] | Buildings Works and Improvements [Member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | (868) |  |  |  |
Property plant and equipment, Ending balance |  | (883) | (868) |  |  |
Accumulated depreciation and amortisation [member] | Machinery and equipment [member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | (2,078) |  |  |  |
Property plant and equipment, Ending balance |  | (2,143) | (2,078) |  |  |
Accumulated depreciation and amortisation [member] | Vehicle [Member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | (15) |  |  |  |
Property plant and equipment, Ending balance |  | (16) | (15) |  |  |
Accumulated depreciation and amortisation [member] | Furniture and utensils [member] | Investment property completed [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Property plant and equipment, Beginning balance |  | (11) |  |  |  |
Property plant and equipment, Ending balance |  | R$ (11) | R$ (11) |  |  |
[1] | Certain land linked to concession agreements with no indemnity provision is depreciated over the concession period.
[2] | Certain land linked to concession agreements with no indemnity provision is amortized over the concession period.
[3] | Certain land linked to concession agreements with no indemnity provision is depreciated over the concession period.

X
- Definition Gain Recognised In Bargain Purchase Transactions + References No definition available. + Details
Name: | cig_GainRecognisedInBargainPurchaseTransactions
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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 Property Plants And Equipment Net + References No definition available. + Details
Name: | cig_PropertyPlantsAndEquipmentNet
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The increase in property, plant and equipment resulting from acquisitions through business combinations. [Refer: Total for all business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e_iii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Total for all business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 75 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_75_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_DepreciationPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e_ii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_DisposalsPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in property, plant and equipment resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. Note that right-of-use assets are not included. [Contrast: Property, plant and equipment including right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_PropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

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

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

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cig_MachineryAndEquipment1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_GrossCarryingAmountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_AccumulatedDepreciationAndAmortisationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |