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Concessions and Authorizations - Schedule of Concessions and Authorizations Held (Details) | 12 Months Ended
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Dec. 31, 2024
Central Geradora Elica Praias De Parajuru Wind Power Plants [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Praias de Parajuru | [1]
Concession or authorization contract | Resolution 526/2002 |
Expiration date | 09/2032 |
Central Geradora Elica Volta Do Rio Wind Power Plants [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Volta do Rio |
Concession or authorization contract | Resolution 660/2001 |
Expiration date | 01/2031 |
UFV Mineirao Photovoltaic Power Plants [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig GT |
Concession or authorization contract |  |
Expiration date |  |
Energy Distribution [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig D |
Concession or authorization contract | 002/1997 |
Expiration date | 12/2045 |
Energy Distribution 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig D |
Concession or authorization contract | 003/1997 |
Expiration date | 12/2045 |
Energy Distribution 2 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig D |
Concession or authorization contract | 004/1997 |
Expiration date | 12/2045 |
Energy Distribution 3 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig D |
Concession or authorization contract | 005/1997 |
Expiration date | 12/2045 |
Gas distribution [member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Gasmig |
Concession or authorization contract | State Law 11,021/1993 |
Expiration date | 01/2053 |
UFV Tres Marias GD Photovoltaic Power Plants [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | UFV Três Marias |
Concession or authorization contract |  |
Expiration date |  |
UFV Advogado Eduardo Soares Photovoltaic Power Plants [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | UFV Boa Esperança | [2]
Concession or authorization contract |  |
Expiration date |  |
UFV Jusante Photovoltaic Power Plants [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig GT |
Concession or authorization contract |  |
Expiration date |  |
UFVs Cemig SIM Photovoltaic Power Plants [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig SIM | [3]
Concession or authorization contract |  |
Expiration date |  |
National Grid [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig GT | [4]
Concession or authorization contract | 006/1997 |
Expiration date | 01/2043 |
Itajuba Substation [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig GT |
Concession or authorization contract | 79/2000 |
Expiration date | 10/2030 |
Furnas Pimenta [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Centroeste |
Concession or authorization contract | 004/2005 |
Expiration date | 03/2035 |
Subestacao Sete Lagoas [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Sete Lagoas |
Concession or authorization contract | 006/2011 |
Expiration date | 06/2041 |
Governador Valadares 6 Verona Transmission line [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Centroeste |
Concession or authorization contract | 001/2023 |
Expiration date | 03/2053 |
Theodomiro Carneiro Santiago Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig GT | [5]
Concession or authorization contract | 07/1997 |
Expiration date | 05/2027 |
Nova Ponte Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig GT |
Concession or authorization contract | 07/1997 |
Expiration date | 08/2027 |
Sa Carvalho Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Sá Carvalho |
Concession or authorization contract | 01/2004 |
Expiration date | 08/2026 |
Rosal Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Rosal Energia |
Concession or authorization contract | 01/1997 |
Expiration date | 12/2035 |
Machado Mineiro Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Horizontes Energia | [6]
Concession or authorization contract | Resolution 331/2002 |
Expiration date | 05/2027 |
Pch Pai Joaquim Hydro Electric Plants Member [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig PCH |
Concession or authorization contract | Authorizing Resolution 377/2005 |
Expiration date | 04/2032 |
Irape Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig GT |
Concession or authorization contract | 14/2000 |
Expiration date | 09/2037 |
Queimado Consortium [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig GT |
Concession or authorization contract | 06/1997 |
Expiration date | 06/2034 |
Poco Fundo Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Poço Fundo |
Concession or authorization contract | 01/2021 |
Expiration date | 05/2052 |
Tres Marias Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig Geração Três Marias |
Concession or authorization contract | 08/2016 |
Expiration date | 01/2053 |
Salto Grande Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig Geração Salto Grande |
Concession or authorization contract | 09/2016 |
Expiration date | 01/2053 |
Itutinga Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig Geração Itutinga |
Concession or authorization contract | 10/2016 |
Expiration date | 01/2053 |
Camargos Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig Geração Camargos |
Concession or authorization contract | 11/2016 |
Expiration date | 01/2053 |
Coronel Domiciano [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig Geração Sul |
Concession or authorization contract | 12/2016 and 13/2016 |
Expiration date | 04/2047 |
Joasal Marmelos Paciencia And Piau [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig Geração Sul | [7],[8]
Concession or authorization contract | 12/2016 and 13/2016 |
Expiration date | 01/2053 |
Dona Rita [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig Geração Leste |
Concession or authorization contract | 14/2016 and 15/2016 |
Expiration date | 07/2050 |
Ervalia [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig Geração Leste |
Concession or authorization contract | 14/2016 and 15/2016 |
Expiration date | 04/2047 |
Neblina [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig Geração Leste |
Concession or authorization contract | 14/2016 and 15/2016 |
Expiration date | 01/2053 |
Peti [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig Geração Leste |
Concession or authorization contract | 14/2016 and 15/2016 |
Expiration date | 03/2047 |
Sinceridade [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig Geração Leste |
Concession or authorization contract | 14/2016 and 15/2016 |
Expiration date | 12/2046 |
Tronqueiras [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig Geração Leste |
Concession or authorization contract | 14/2016 and 15/2016 |
Cajuru Gafanhoto And Martins Hydroelectric Plants [Member] | National Electrical Energy Agency [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Company holding concession or authorization | Cemig Geração Oeste |
Concession or authorization contract | 16/2016 |
Expiration date | 01/2053 |
[1] | Refer to concessions, by means of authorization, of wind power generation in the independent production modality, trated in the scope of Program to Encourage Alternative Sources of Electricity (Programa de Incentivo às Fontes Alternativas de Energia Elétrica, or ‘Proinfa’). The assets linked to the exploration right are registered in fixed assets. The exploration authorization rights are classified in the consolidated balance sheet as intangible assets.
[2] | On January 24, 2024, Aneel, by its Dispatch 184/2024 authorized changing the name of the Boa Esperança solar generation plant (‘UFV Boa Esperança’) to the Advogado Eduardo Soares solar generation plant (‘UFV Advogado Eduardo Soares’).
[3] | Cemig Sim, controlled by the Company, operates in provision of generation of electricity from photovoltaic solar sources to the distributed generation market. It has 100% ownership of eight photovoltaic generation plants, all located in Minas Gerais.
[4] | These refer to power transmission concession agreements which, in accordance with IFRS 15, are classified as contract assets as they are subject to the satisfaction of performance obligations in the provision of the electric energy transmission service.
[5] | Refer to power generation concession agreements that are not in the scope of IFRIC 12, whose infrastructure assets are recorded as property, plant and equipment since the grantor does not control to whom the services should be provided and their price, and their energy is mainly sold in the Free Contracting Environment (Ambiente de Contratação Livre, or ‘ACL’).
[6] | On February 20, 2024, the Grantor (Agência Nacional de Energia Elétrica, or ‘Aneel’) transferred the authorization of the Machado Mineiro SHP (Small Hydroelectric Plant) from Horizontes Energia S.A. to Cemig GT, through Dispatch 504/2024.
[7] | On December 5, 2024 the Cemig GT held a public auction for sale, as a single lot, of the right to operate the energy generation services of four generation plants, comprising: one SHP, directly owned by Cemig GT; and three hydroelectric generation plants owned by its wholly-owned subsidiaries. More details in Note 31.
[8] | Refers to energy generation concession contracts whose concession bonus revenue is classified as financial assets of the concession.

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