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Investments - Schedule of Percentage of Company's Equity Interest (Details) - BRL (R$) R$ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
IfrsStatementLineItems [Line Items] |  |  |
Total investments |  | R$ 3,221 | R$ 4,632
C E M I G Geracaoe Transmissao [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control |  | Controlled |
Total investments |  |  |
Guanhaes Energia [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control | [1] | Jointly controlled |
Total investments |  | R$ 172 | 222
Hidreletrica cachoeirao [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control |  | Jointly controlled |
Total investments |  | R$ 45 | 47
Hidreletrica pipoca [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control |  | Jointly controlled |
Total investments |  | R$ 54 | 47
Alianca norte (belo monte plant) [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control | [2] | Jointly controlled |
Total investments |  | R$ 419 | 536
Alianca Geracao [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control | [3] | Jointly controlled |
Total investments |  |  | 1,172
Amazonia Energia [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control |  | Jointly controlled |
Total investments |  | R$ 697 | 819
Paracambi Energetica [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control |  | Jointly controlled |
Total investments |  | R$ 105 | 112
Taesa [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control |  | Jointly controlled |
Total investments |  | R$ 1,615 | 1,565
C E M I G Sim [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control |  | Controlled |
U F V S [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Control | [4] | Jointly controlled |
Total investments |  | R$ 114 | R$ 112
[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] | Indirect interest in the Belo Monte plant through these investees.
[3] | On August 13, 2024, the process of sale of the interest to Vale S.A. was completed. For more information, please see Note 31.
[4] | Set of photovoltaics business, in which the investee Cemig Sim has an interest.

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