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Concessions and Authorizations - Schedule of Concessions and Authorizations Held (Detail) | 12 Months Ended
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Dec. 31, 2017
National electricity aqgency [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Gasmig
Concession or authorization contract | State Law 11,021/1993
Expiration date | 01/2053
National electricity aqgency [member] | National Grid [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig GT
Concession or authorization contract | 006/1997
Expiration date | 07/2015
National electricity aqgency [member] | Itajuba Substation [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig GT
Concession or authorization contract | 79/2000
Expiration date | 10/2030
National electricity aqgency [member] | Emborcacao hydroelectric plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig GT
Concession or authorization contract | 07/1997
Expiration date | 07/2025
National electricity aqgency [member] | Nova ponte hydroelectric plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig GT
Concession or authorization contract | 07/1997
Expiration date | 07/2025
National electricity aqgency [member] | Santa Luzia Hydroelectric Plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig GT
Concession or authorization contract | 07/1997
Expiration date | 02/2026
National electricity aqgency [member] | Sa Carvalho Hydroelectric Plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Sá Carvalho
Concession or authorization contract | 01/2004
Expiration date | 12/2024
National electricity aqgency [member] | Rosal Hydroelectric Plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Rosal Energia
Concession or authorization contract | 01/1997
Expiration date | 05/2032
National electricity aqgency [member] | Machado Mineiro Hydroelectric Plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Horizontes Energia
Concession or authorization contract | Resolution 331/2002
Expiration date | 07/2025
National electricity aqgency [member] | Salto Voltao Hydroelectric Plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Horizontes Energia
Concession or authorization contract | Resolution 331/2002
Expiration date | 10/2030
National electricity aqgency [member] | Salto paraopeba hydroelectric plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Horizontes Energia
Concession or authorization contract | Resolution 331/2002
Expiration date | 10/2030
National electricity aqgency [member] | Salto do passo velho hydroelectric plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Horizontes Energia
Concession or authorization contract | Resolution 331/2002
Expiration date | 10/2030
National electricity aqgency [member] | PCH pai joaquim hydro electric plants member [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig PCH
Concession or authorization contract | Authorizing Resolution 377/2005
Expiration date | 04/2032
National electricity aqgency [member] | Irape hydroelectric plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig GT
Concession or authorization contract | 14/2000
Expiration date | 02/2035
National electricity aqgency [member] | Queimado hydroelectric plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig GT
Concession or authorization contract | 06/1997
Expiration date | 01/2033
National electricity aqgency [member] | Salto morais hydroelectric plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig GT
Concession or authorization contract | 02/2013
Expiration date | 07/2020
National electricity aqgency [member] | Rio De Pedras Hydroelectric Plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig GT
Concession or authorization contract | 02/2013
Expiration date | 09/2024
National electricity aqgency [member] | Luiz Dias Hydroelectric Plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig GT
Concession or authorization contract | 02/2013
Expiration date | 08/2025
National electricity aqgency [member] | Poco Fundo Hydroelectric Plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig GT
Concession or authorization contract | 02/2013
Expiration date | 08/2025
National electricity aqgency [member] | Sao Bernardo Hydroelectric Plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig GT
Concession or authorization contract | 02/2013
Expiration date | 08/2025
National electricity aqgency [member] | Xicao Hydroelectric Plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig GT
Concession or authorization contract | 02/2013
Expiration date | 08/2025
National electricity aqgency [member] | Tres Marias Hydroelectric Plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig Geração Três Marias S.A.
Concession or authorization contract | 08/2016
Expiration date | 01/2046
National electricity aqgency [member] | Salto Grande Hydroelectric Plant [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig Geração Salto Grande
Concession or authorization contract | 09/2016
Expiration date | 01/2046
National electricity aqgency [member] | Itutinga Hydroelectric Plant [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig Geração Itutinga
Concession or authorization contract | 10/2016
Expiration date | 01/2046
National electricity aqgency [member] | Camargos Hydroelectric Plant [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig Geração Camargos
Concession or authorization contract | 11/2016
Expiration date | 01/2046
National electricity aqgency [member] | Coronel Domiciano Joasal Marmelos Paciencia E Piau Hydroelectric Plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig Geração Sul
Concession or authorization contract | 12/2016 and 13/2016
Expiration date | 01/2046
National electricity aqgency [member] | Dona Rita Ervalia Neblina Peti Sinceridade And Tronqueiras Hydroelectric Plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig Geração Leste
Concession or authorization contract | 14/2016 and 15/2016
Expiration date | 01/2046
National electricity aqgency [member] | Cajuru Gafan Hoto and Martins Hydroelectric Plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig Geração Oeste S.A.
Concession or authorization contract | 16/2016
Expiration date | 01/2046
National electricity aqgency [member] | Igarape thermal plants [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig GT
Concession or authorization contract | 07/1997
Expiration date | 08/2024
Electricity Distribution [member] |
Disclosure of electricity concessions and authorizations [Line Items] |
Company holding concession or authorization | Cemig D
Concession or authorization contract | 002/1997 003/1997 004/1997 005/1997
Expiration date | 12/2045

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