XML 138 R117.htm IDEA: XBRL DOCUMENT v3.25.1

Investments - Schedule of Subsidiaries and Jointly Controlled Entities Percentage by the Company's Ownership Interest (Details) - BRL (R$)
R$ in Millions

12 Months Ended

Dec. 31, 2024

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

IfrsStatementLineItems [Line Items]

Share capital

R$ 14,309

R$ 11,007

Equity

R$ 27,382

R$ 24,656

R$ 21,784

R$ 19,462

C E M I G Geracaoe Transmissao [Member]

IfrsStatementLineItems [Line Items]

Number of shares

2,896,785,358

Cemig interest %

100.00%

100.00%

Share capital

R$ 5,474

R$ 5,474

Equity

R$ 11,665

R$ 8,893

Hidreletrica cachoeirao [member]

IfrsStatementLineItems [Line Items]

Number of shares

35,000,000

Cemig interest %

49.00%

49.00%

Share capital

R$ 35

R$ 35

Equity

R$ 96

R$ 96

Guanhaes Energia [Member]

IfrsStatementLineItems [Line Items]

Number of shares

548,626,000

Cemig interest %

49.00%

49.00%

Share capital

R$ 549

R$ 549

Equity

R$ 419

R$ 373

Hidreletrica pipoca [member]

IfrsStatementLineItems [Line Items]

Number of shares

41,360,000

Cemig interest %

49.00%

49.00%

Share capital

R$ 41

R$ 41

Equity

R$ 97

R$ 95

Parajuru [Member]

IfrsStatementLineItems [Line Items]

Number of shares

35,000,000

Cemig interest %

100.00%

100.00%

Share capital

R$ 35

R$ 86

Equity

R$ 107

R$ 158

Voltado Rio [Member]

IfrsStatementLineItems [Line Items]

Number of shares

160,000,000

Cemig interest %

100.00%

100.00%

Share capital

R$ 160

R$ 275

Equity

R$ 200

R$ 248

Paracambi [Member]

IfrsStatementLineItems [Line Items]

Number of shares

79,078,937

Cemig interest %

49.00%

49.00%

Share capital

R$ 57

R$ 79

Equity

R$ 83

R$ 123

Alianca norte (belo monte plant) [member]

IfrsStatementLineItems [Line Items]

Number of shares

42,028,825,151

Cemig interest %

49.00%

49.00%

Share capital

R$ 1,210

R$ 1,210

Equity

R$ 1,007

R$ 1,084

Amazonia Energia [Member]

IfrsStatementLineItems [Line Items]

Number of shares

^[1]

1,323,819,670

Cemig interest %

74.50%

74.50%

Share capital

R$ 1,323

R$ 1,323

Equity

R$ 1,099

R$ 1,189

UFV Boa Esperanca [member]

IfrsStatementLineItems [Line Items]

Number of shares

^[2]

402,296,837

Cemig interest %

100.00%

100.00%

Share capital

R$ 402

Equity

R$ 405

Cemig Ger Itutinga S A [Member]

IfrsStatementLineItems [Line Items]

Number of shares

151,309,332

Cemig interest %

100.00%

100.00%

Share capital

R$ 148

R$ 151

Equity

R$ 284

R$ 231

Cemig Geracao Camargos S A [Member]

IfrsStatementLineItems [Line Items]

Number of shares

113,499,102

Cemig interest %

100.00%

100.00%

Share capital

R$ 101

R$ 113

Equity

R$ 200

R$ 183

Cemig Geracao Sul S A [Member]

IfrsStatementLineItems [Line Items]

Number of shares

148,146,505

Cemig interest %

100.00%

100.00%

Share capital

R$ 61

R$ 148

Equity

R$ 163

R$ 252

Cemig Geracao Leste S A [Member]

IfrsStatementLineItems [Line Items]

Number of shares

100,568,929

Cemig interest %

100.00%

100.00%

Share capital

R$ 51

R$ 101

Equity

R$ 91

R$ 168

Cemig Geracao Oeste S A [Member]

IfrsStatementLineItems [Line Items]

Number of shares

60,595,484

Cemig interest %

100.00%

100.00%

Share capital

R$ 7

R$ 61

Equity

R$ 101

R$ 126

Rosal Energia S A [Member]

IfrsStatementLineItems [Line Items]

Number of shares

46,944,467

Cemig interest %

100.00%

100.00%

Share capital

R$ 47

R$ 47

Equity

R$ 109

R$ 123

Sa Carvalho S A [Member]

IfrsStatementLineItems [Line Items]

Number of shares

361,200,000

Cemig interest %

100.00%

100.00%

Share capital

R$ 37

R$ 37

Equity

R$ 97

R$ 138

Horizontes Energia S A [Member]

IfrsStatementLineItems [Line Items]

Number of shares

10,000,000

Cemig interest %

100.00%

100.00%

Share capital

R$ 4

R$ 39

Equity

R$ 13

R$ 61

Cemig P C H S A [Member]

IfrsStatementLineItems [Line Items]

Number of shares

6,000,000

Cemig interest %

100.00%

100.00%

Share capital

R$ 6

R$ 46

Equity

R$ 48

R$ 99

Cemig Geracao Poco Fundo S A [Member]

IfrsStatementLineItems [Line Items]

Number of shares

159,084,895

Cemig interest %

100.00%

100.00%

Share capital

R$ 159

R$ 139

Equity

R$ 162

R$ 172

Empresa De Servicos De Comercializacao De Energia Eletrica S A [Member]

IfrsStatementLineItems [Line Items]

Number of shares

3,000,000

Cemig interest %

100.00%

100.00%

Share capital

R$ 3

Equity

R$ 21

R$ 11

Cemig Trading S A [Member]

IfrsStatementLineItems [Line Items]

Number of shares

4,000,000

Cemig interest %

100.00%

100.00%

Share capital

R$ 4

R$ 1

Equity

R$ 6

R$ 6

Centroeste [Member]

IfrsStatementLineItems [Line Items]

Number of shares

28,000,000

Cemig interest %

100.00%

100.00%

Share capital

R$ 28

R$ 28

Equity

R$ 135

R$ 120

UFV Tres Marias [Member]

IfrsStatementLineItems [Line Items]

Number of shares

6,887,499

Cemig interest %

100.00%

100.00%

Share capital

R$ 35

Equity

R$ 38

Cemig Distribuicao [Member]

IfrsStatementLineItems [Line Items]

Number of shares

2,359,113,452

Cemig interest %

100.00%

100.00%

Share capital

R$ 6,964

R$ 5,372

Equity

R$ 11,281

R$ 7,105

Taesa [Member]

IfrsStatementLineItems [Line Items]

Number of shares

1,033,496,721

Cemig interest %

21.68%

21.68%

Share capital

R$ 3,042

R$ 3,042

Equity

R$ 6,679

R$ 6,570

Gasmig [Member]

IfrsStatementLineItems [Line Items]

Number of shares

306,941,598

Cemig interest %

99.57%

99.57%

Share capital

R$ 665

R$ 665

Equity

R$ 1,231

R$ 1,373

C E M I G Sim [Member]

IfrsStatementLineItems [Line Items]

Number of shares

657,647,242

Cemig interest %

100.00%

100.00%

Share capital

R$ 658

R$ 175

Equity

R$ 755

R$ 199

Sete Lagoas [Member]

IfrsStatementLineItems [Line Items]

Number of shares

36,857,080

Cemig interest %

100.00%

100.00%

Share capital

R$ 51

R$ 37

Equity

R$ 91

R$ 73

[1]	Indirect participation in Belo Monte Plant through this investee.
[2]	On October 29, 2024 an EGM approved change of the name of Cemig Baguari S.A. to UFV Boa Esperança S.A.

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

Number of shares held in subsidiaries or jointly controlled entities.

+ References

No definition available.

+ Details

Name:	cig_NumberOfSharesHeldInSubsidiariesOrJointlyControlledEntities
Namespace Prefix:	cig_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Proportion of ownership interest in subsidiaries and jointly controlled entities.

+ References

No definition available.

+ Details

Name:	cig_ProportionOfOwnershipInterestInSubsidiariesAndJointlyControlledEntities
Namespace Prefix:	cig_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of residual interest in the assets of the entity after deducting all its liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 1
-IssueDate 2024-01-01
-Paragraph 24
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2024-en-r&anchor=para_24_a&doctype=Standard
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 1
-IssueDate 2024-01-01
-Paragraph 32
-Subparagraph a
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2024-en-r&anchor=para_32_a_i&doctype=Standard
-URIDate 2024-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2024-01-01
-Paragraph 93
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_a&doctype=Standard
-URIDate 2024-03-27

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2024-01-01
-Paragraph 93
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_e&doctype=Standard
-URIDate 2024-03-27

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2024-01-01
-Paragraph 93
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_b&doctype=Standard
-URIDate 2024-03-27

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 78
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78_e&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_Equity
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The nominal value of capital issued.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 78
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78_e&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_IssuedCapital
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CEMIGGeracaoeTransmissaoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_HidreletricaCachoeiraoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_GuanhaesEnergiaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_HidreletricaPipocaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_ParajuruMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_VoltadoRioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_ParacambiMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_AliancaNorteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_AmazoniaEnergiaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_UFVBoaEsperancaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigGerItutingaSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigGeracaoCamargosSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigGeracaoSulSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigGeracaoLesteSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigGeracaoOesteSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_RosalEnergiaSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_SaCarvalhoSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_HorizontesEnergiaSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigPCHSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigGeracaoPocoFundoSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_EmpresaDeServicosDeComercializacaoDeEnergiaEletricaSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigTradingSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CentroesteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_UfvTresMariasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigDistribuicaoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_TaesaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_GasmigMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CEMIGSimMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_SeteLagoasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: