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Revenue - Schedule of Deduction on Revenue (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
IfrsStatementLineItems [Line Items] |  |  |  |
Taxes on revenues |  | R$ 8,740 | R$ 8,488 | R$ 10,464
Charges to the consumer |  | 4,344 | 4,198 | 3,215
Deductions from revenue |  | 13,084 | 12,686 | 13,679
ICMS - State VAT [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Taxes on revenues | [1] | 5,043 | 4,892 | 6,993
Cofins [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Taxes on revenues |  | 3,032 | 2,948 | 2,842
Pis and pasep tax [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Taxes on revenues |  | 658 | 643 | 618
Other Taxes [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Taxes on revenues |  | 7 | 5 | 11
Global Reversion Reserve (RGR) [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Charges to the consumer |  | 12 | 14 | 15
Energy Efficiency Program (PEE) [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Charges to the consumer |  | 74 | 69 | 74
Energy Development Account (CDE) [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Charges to the consumer |  | 3,949 | 4,057 | 2,658
Research and Development [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Charges to the consumer |  | 37 | 35 | 34
National Scientific and Technological Development Fund (FNDCT) [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Charges to the consumer |  | 53 | 49 | 55
Energy System Expansion Research (EPE of MME) [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Charges to the consumer |  | 27 | 25 | 27
Customer charges - Proinfa alternative sources program [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Charges to the consumer |  | 63 | 77 | 66
Energy services inspection fee [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Charges to the consumer |  | 37 | 33 | 35
Royalties for use of water resources [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Charges to the consumer |  | 53 | 54 | 37
Customer charges - the 'Flag Tariff' system [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Charges to the consumer |  |  | (252) | 162
Cde On R And D [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Charges to the consumer |  | 16 | 15 | 21
Cde On Eep [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Charges to the consumer |  | R$ 23 | R$ 22 | R$ 31
[1] | On June 23, 2022, Complementary Law 194 came into force with immediate effect, making changes to the National Tax Code (CTN) and to Complementary Law 87/96 (the ‘Kandir Law’) including: (i) classifying electricity, among other goods, as essential, (ii) prohibiting the setting of rates of ICMS tax for transactions with these goods at a level higher than those of transactions in general, and (iii) removing this tax from electricity transmission and distribution services, and from sector charges linked to electricity operations. In February 2023 judgment was given in Action for Unconstitutionality (Ação Direta de Inconstitucionalidade – ADI) No. 7195, which suspended the effects of Article 3, Sub-item X, of Complementary Law 87/96, as amended by Complementary Law 194/2022, which had excluded transmission and distribution services, and sector charges related to electricity operations, from the calculation base for ICMS tax. Cemig has adjusted its procedures due to this decision.

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