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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.

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