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Investments - Schedule of Changes in Investments in Subsidiaries Jointly Controlled Entities and Affiliates (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | R$ 4,632 |  | R$ 5,107 |  | R$ 4,923 |
Gain (loss) by equity method (Income statement) |  | 224 |  | 432 |  | 845 |
Dividends |  | (423) |  | (496) |  | (519) |
Additions / acquisitions |  | 16 |  | 36 |  | 51 |
Other |  | (1,228) |  | (447) |  | (193) |
Ending balance |  | 3,221 |  | 4,632 |  | 5,107 |
Hidreletrica cachoeirao [member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 47 |  | 47 |  | 59 |
Gain (loss) by equity method (Income statement) |  | 5 |  | 12 |  | 15 |
Dividends |  | (7) |  | (12) |  | (27) |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  |  |
Ending balance |  | 45 |  | 47 |  | 47 |
Guanhaes Energia [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 222 |  | 183 |  | 125 |
Gain (loss) by equity method (Income statement) |  | 10 |  | 39 |  | 58 |
Dividends |  | (12) |  |  |  |  |
Additions / acquisitions |  |  | [1] |  |  |  |
Other |  | (48) |  |  |  |  |
Ending balance |  | 172 |  | 222 |  | 183 |
Hidreletrica pipoca [member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 47 |  | 47 |  | 47 |
Gain (loss) by equity method (Income statement) |  | 15 |  | 15 |  | 16 |
Dividends |  | (8) |  | (15) |  | (16) |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  |  |
Ending balance |  | 54 |  | 47 |  | 47 |
M E S A [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  | 10 | [2] |  | [3]
Gain (loss) by equity method (Income statement) |  |  |  | (10) |  | 10 |
Dividends |  |  |  |  |  |  |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  |  |
Ending balance |  |  |  |  |  | 10 | [2]
Fip Melbourne [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  | 8 |  |  | [4]
Gain (loss) by equity method (Income statement) |  |  |  | 22 |  | 169 |
Dividends |  |  |  |  |  |  |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  | (30) |  | (161) |
Ending balance |  |  |  |  |  | 8 |
Paracambi [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 112 | [5] | 134 |  | 124 |
Gain (loss) by equity method (Income statement) |  | 19 |  | 15 |  | 17 |
Dividends |  | (17) |  | (26) |  | (7) |
Additions / acquisitions |  |  |  |  |  |  |
Other |  | (9) |  | (11) |  |  |
Ending balance |  | 105 |  | 112 | [5] | 134 |
Baguari Energia [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  | 160 | [6] | 168 |
Gain (loss) by equity method (Income statement) |  |  |  | 12 |  | 22 |
Dividends |  |  |  | (12) |  | (30) |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  | (160) |  |  |
Ending balance |  |  |  |  |  | 160 | [6]
Amazonia Energia [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 819 | [7] | 886 | [8] | 933 | [9]
Gain (loss) by equity method (Income statement) |  | (122) |  | (67) |  | (47) |
Dividends |  |  |  |  |  |  |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  |  |
Ending balance |  | 697 |  | 819 | [7] | 886 | [8]
Alianca norte (belo monte plant) [member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 536 |  | 576 |  | 609 |
Gain (loss) by equity method (Income statement) |  | (77) |  | (40) |  | (33) |
Dividends |  |  |  |  |  |  |
Additions / acquisitions |  | 1 |  |  |  |  |
Other |  | (41) |  |  |  |  |
Ending balance |  | 419 |  | 536 |  | 576 |
Ativas [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  | 16 |
Gain (loss) by equity method (Income statement) |  |  |  |  |  | (1) |
Dividends |  |  |  |  |  |  |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  | (15) |
Ending balance |  |  |  |  |  |  |
Taesa [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 1,565 |  | 1,549 |  | 1,580 |
Gain (loss) by equity method (Income statement) |  | 330 |  | 278 |  | 305 |
Dividends |  | (280) |  | (262) |  | (336) |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  |  |
Ending balance |  | 1,615 |  | 1,565 |  | 1,549 |
Alianca Geracao [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 1,172 | [10] | 1,194 |  | 1,141 |
Gain (loss) by equity method (Income statement) |  | 31 |  | 136 |  | 104 |
Dividends |  | (84) |  | (158) |  | (48) |
Additions / acquisitions |  |  |  |  |  |  |
Other |  | (1,119) |  |  |  | (3) |
Ending balance |  |  |  | 1,172 | [10] | 1,194 |
Retiro Baixo [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  | 185 |  | 201 |
Gain (loss) by equity method (Income statement) |  |  |  | 5 |  | 22 |
Dividends |  |  |  |  |  | (38) |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  | (191) |  |  |
Ending balance |  |  |  |  |  | 185 |
Beginning balance |  | (1) |  | 185 |  |  |
Ending balance |  |  |  | (1) |  | 185 |
U F V Janauba Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 5 |  | 3 |  | 3 |
Gain (loss) by equity method (Income statement) |  | 1 |  | 2 |  | 1 |
Dividends |  | (1) |  |  |  | (1) |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  |  |
Ending balance |  | 5 |  | 5 |  | 3 |
U F V Corinto Geracao De Energia Eletrica Distriiuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 8 |  | 8 |  | 9 | [11]
Gain (loss) by equity method (Income statement) |  | 2 |  | 1 |  | 2 |
Dividends |  | (1) |  | (1) |  | (2) |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  | (1) |
Ending balance |  | 9 |  | 8 |  | 8 |
U F V Manga Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 12 |  | 11 |  | 11 |
Gain (loss) by equity method (Income statement) |  | 2 |  | 2 |  | 3 |
Dividends |  | (2) |  | (1) |  | (2) |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  | (1) |
Ending balance |  | 12 |  | 12 |  | 11 |
U F V Bonfinopolis I I Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 5 |  | 5 |  | 6 |
Gain (loss) by equity method (Income statement) |  | 2 |  |  |  | 1 |
Dividends |  | (1) |  |  |  | (1) |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  | (1) |
Ending balance |  | 6 |  | 5 |  | 5 |
U F V Lagoa Grande Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 15 |  | 15 |  | 15 |
Gain (loss) by equity method (Income statement) |  | 2 |  | 2 |  | 3 |
Dividends |  | (2) |  | (2) |  | (2) |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  | (1) |
Ending balance |  | 15 |  | 15 |  | 15 |
U F V Lontra Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 18 |  | 18 |  | 18 |
Gain (loss) by equity method (Income statement) |  | 2 |  | 2 |  | 4 |
Dividends |  | (2) |  | (2) |  | (3) |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  | (1) |
Ending balance |  | 18 |  | 18 |  | 18 |
U F V Mato Verde Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 6 |  | 6 |  | 6 |
Gain (loss) by equity method (Income statement) |  | 1 |  | 1 |  | 1 |
Dividends |  | (1) |  | (1) |  | (1) |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  |  |
Ending balance |  | 6 |  | 6 |  | 6 |
U F V Mirabela Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 5 |  | 4 |  | 4 |
Gain (loss) by equity method (Income statement) |  |  |  | 1 |  | 1 |
Dividends |  | (1) |  |  |  | (1) |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  |  |
Ending balance |  | 4 |  | 5 |  | 4 |
U F V Porteirinha I Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 4 |  | 4 |  | 5 |
Gain (loss) by equity method (Income statement) |  | 2 |  | 1 |  | 1 |
Dividends |  | (1) |  | (1) |  | (1) |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  | (1) |
Ending balance |  | 5 |  | 4 |  | 4 |
U F V Porteirinha I I Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 7 |  | 7 |  | 7 |
Gain (loss) by equity method (Income statement) |  | 1 |  | 1 |  | 1 |
Dividends |  | (1) |  | (1) |  | (1) |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  |  |
Ending balance |  | 7 |  | 7 |  | 7 |
U F V Brasilandia Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 15 |  | 15 |  | 15 |
Gain (loss) by equity method (Income statement) |  | 2 |  | 2 |  | 3 |
Dividends |  | (2) |  | (2) |  | (2) |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  | (1) |
Ending balance |  | 15 |  | 15 |  | 15 |
Apolo I S P E Empreendimentos E Energia [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 6 |  | 7 |  |  |
Gain (loss) by equity method (Income statement) |  |  |  |  |  | 1 |
Dividends |  |  |  |  |  |  |
Additions / acquisitions |  |  |  |  |  | 6 |
Other |  |  |  | (1) |  |  |
Ending balance |  | 6 |  | 6 |  | 7 |
Apolo I I S P E Empreendimentos E Energia [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 6 |  |  |  |  |
Gain (loss) by equity method (Income statement) |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |
Additions / acquisitions |  |  |  | 6 |  |  |
Other |  |  |  |  |  |  |
Ending balance |  | 6 |  | 6 |  |  |
U F V Campo Lindo I [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  | 8 | [12] |  |
Gain (loss) by equity method (Income statement) |  |  |  |  |  | 1 |
Dividends |  |  |  |  |  |  |
Additions / acquisitions |  |  |  | 10 |  | 7 |
Other |  |  |  | (18) |  |  |
Ending balance |  |  |  |  |  | 8 | [12]
U F V Campo Lindo I I [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 1 |  | 9 |  |  |
Gain (loss) by equity method (Income statement) |  |  |  |  |  | 2 |
Dividends |  |  |  |  |  |  |
Additions / acquisitions |  |  |  | 10 |  | 7 |
Other |  |  |  | (18) |  |  |
Ending balance |  |  |  | 1 |  | 9 |
U F V Olaria I [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  | 8 |  |  |
Gain (loss) by equity method (Income statement) |  |  |  |  |  | 1 |
Dividends |  |  |  |  |  |  |
Additions / acquisitions |  |  |  | 10 |  | 7 |
Other |  |  |  | (18) |  |  |
Ending balance |  |  |  |  |  | 8 |
Axxiom [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  | 4 |
Gain (loss) by equity method (Income statement) |  |  |  |  |  | (4) |
Dividends |  |  |  |  |  |  |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |
Itaocara [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  | [13] |  |  |  |
Gain (loss) by equity method (Income statement) |  | (4) |  |  |  | (3) |
Dividends |  |  |  |  |  |  |
Additions / acquisitions |  | 15 |  |  |  | 10 |
Other |  | (11) |  |  |  | (7) |
Ending balance |  |  |  |  | [13] |  |
Total of investments [member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | R$ 4,632 |  | 5,107 |  | 5,106 |
Gain (loss) by equity method (Income statement) |  |  |  | 432 |  | 676 |
Dividends |  |  |  | (496) |  | (519) |
Additions / acquisitions |  |  |  | 36 |  | 37 |
Other |  |  |  | (447) |  | (193) |
Ending balance |  |  |  | 4,632 |  | 5,107 |
Itaocara Overdraft Liability [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |
Gain (loss) by equity method (Income statement) |  |  |  |  |  | 7 |
Dividends |  |  |  |  |  |  |
Additions / acquisitions |  |  |  |  |  | 14 |
Other |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  | (21) |
M E S A Loss Provisions [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |
Gain (loss) by equity method (Income statement) |  |  |  |  |  | 162 |
Dividends |  |  |  |  |  |  |
Additions / acquisitions |  |  |  |  |  |  |
Other |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |
Beginning balance | [14] |  |  |  |  | R$ (162) |
[1] | On September 19, 2023, the Extraordinary General Meeting of Guanhães Energia approved the reduction of share capital in the amount of R$235, of which R$137 was destined for absorbing losses and R$98 for restitution to shareholders. Cemig GT's share corresponds to R$48 was received in 2024.
[2] | On March 20, 2023, Cemig GT completed the sale of its direct and indirect ownership interest in the capital stock of Mesa to Furnas Centrais Elétricas S.A. ("Furnas").
[3] | Indirect participation in the Santo Antônio Plant through these investees.
[4] | On September 12, 2022, AGPar made the payment associated with the settlement arising from Arbitral Award CCBC-86/2016 to the Melbourne Fund. Thereafter, the Company recognized the receivable against income. Further details are provided throughout this note.
[5] | An Extraordinary General Meeting of Paracambi on October 16, 2024 approved reduction of the share capital by R$18 , with no reduction in the number of that company’s nominal common shares. The portion attributable to Cemig GT was R$9, received in 2024.
[6] | The sale of Baguari Energia was completed on October 6, 2023 and the sale of Retiro Baixo was completed on November 22, 2023. The investments writ-off is presented in the "Other" column depicted above.
[7] | Indirect interest in the Belo Monte plant through these investees.
[8] | Indirect participation in Belo Monte Dam through these investees.
[9] | Indirect participation in Belo Monte Dam through these investees.
[10] | Cemig GT's equity interest in Aliança Geração was classified as a non-current asset held for sale in March 2024, under the terms of /IFRS 5. On August 13, 2024, the process of sale of the interest to Vale S.A. was completed. For more information, please see Note 31.
[11] | On May 23, 2022, the reduction of capital stock of these UFVs was approved by means of an Extraordinary General Assembly.
[12] | On July 20, 2023, control of these investees was acquired and they were consolidated by the Company. Therefore, the Company’s interest in these investees is reflected in the Company’s consolidated assets and liabilities.
[13] | Recognition of reimbursement payable to Light Energia S.A., resulting from amounts invested in the development of the Itaocara Hydroelectric Plant project in amounts higher than Light’s corporate participation in the project. This reimbursement was paid on May 22, 2024. The federal tax number (CNPJ – Cadastro Nacional de Pessoas Jurídicas) of this company was canceled in November 2024.
[14] | In June 2022, the provision related to the Company's contractual obligations assumed with the investee and the other shareholders was reversed. Further details are disclosed in this note.

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