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Concessions and Authorizations (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Schedule of Concessions and Authorizations Held | Cemig holds the following concessions or authorizations:
|  | Company holding concession or authorization |  | Concession or authorization contract |  |  | Expiration date |
POWER GENERATION |  |  |  |  |  |  |  |  |  |
Hydroelectric plants |  |  |  |  |  |  |  |  |  |
Emborcação |  | Cemig GT |  |  | 07/1997 |  |  |  | 07/2025 |
Nova Ponte (1) |  | Cemig GT |  |  | 07/1997 |  |  |  | 07/2025 |
Santa Luzia (1) |  | Cemig GT |  |  | 07/1997 |  |  |  | 02/2026 |
Sá Carvalho (1) |  | Sá Carvalho |  |  | 01/2004 |  |  |  | 12/2024 |
Rosal (1) |  | Rosal Energia |  |  | 01/1997 |  |  |  | 05/2032 |
Machado Mineiro (1) Salto Voltão (1) Salto Paraopeba (1) Salto do Passo Velho (1) |  | Horizontes Energia |  |  | Resolution 331/2002 |  |  |  | 07/2025 10/2030 10/2030 10/2030 |
PCH Pai Joaquim (1) |  | Cemig PCH |  |  | Authorizing Resolution 377/2005 |  |  |  | 04/2032 |
Irapé (1) |  | Cemig GT |  |  | 14/2000 |  |  |  | 02/2035 |
Queimado (Consortium) (1) |  | Cemig GT |  |  | 06/1997 |  |  |  | 01/2033 |
Salto Morais (1) |  | Cemig GT |  |  | 02/2013 |  |  |  | 07/2020 |
Rio de Pedras (1) |  | Cemig GT |  |  | 02/2013 |  |  |  | 09/2024 |
Luiz Dias (1) |  | Cemig GT |  |  | 02/2013 |  |  |  | 08/2025 |
Poço Fundo (1) |  | Cemig GT |  |  | 02/2013 |  |  |  | 08/2025 |
São Bernardo (1) |  | Cemig GT |  |  | 02/2013 |  |  |  | 08/2025 |
Xicão (1) |  | Cemig GT |  |  | 02/2013 |  |  |  | 08/2025 |
Três Marias (2) |  | Cemig Geração Três Marias S.A. |  |  | 08/2016 |  |  |  | 01/2046 |
Salto Grande (2) |  | Cemig Geração Salto Grande |  |  | 09/2016 |  |  |  | 01/2046 |
Itutinga (2) |  | Cemig Geração Itutinga |  |  | 10/2016 |  |  |  | 01/2046 |
Camargos (2) |  | Cemig Geração Camargos |  |  | 11/2016 |  |  |  | 01/2046 |
Coronel Domiciano, Joasal, Marmelos, Paciência e Piau (2) |  | Cemig Geração Sul |  |  | 12/2016 and 13/2016 |  |  |  | 01/2046 |
Dona Rita, Ervália, Neblina, Peti, Sinceridade and Tronqueiras (2) |  | Cemig Geração Leste |  |  | 14/2016 and 15/2016 |  |  |  | 01/2046 |
Cajurú, Gafanhoto and Martins (2) |  | Cemig Geração Oeste S.A. |  |  | 16/2016 |  |  |  | 01/2046 |
Thermal plants |  |  |  |  |  |  |  |  |  |
Igarapé (1) |  | Cemig GT |  |  | 07/1997 |  |  |  | 08/2024 |
POWER TRANSMISSION |  |  |  |  |  |  |  |  |  |
National grid (3) |  | Cemig GT |  |  | 006/1997 |  |  |  | 07/2015 |
Itajubá Substation (3) |  | Cemig GT |  |  | 79/2000 |  |  |  | 10/2030 |
ELECTRICITY DISTRIBUTION (4) |  | Cemig D |  |  | 002/1997 003/1997 004/1997 005/1997 |  |  |  | 12/2045 |
GAS DISTRIBUTION (4) |  | Gasmig |  |  | State Law 11,021/1993 |  |  |  | 01/2053 |
(1) | Generation concession contracts that are not within the scope of IFRC 12, whose infrastructure assets are recorded as PP&E since the concession grantor does not have control over whom the service is provided to as the output is being sold mainly in the Free Market (‘ACL’).
(2) | Generation concession contracts within the scope of scope of IFRIC 12, under which Cemig has the right to receive cash and therefore, recognizes a concession financial assets.
(3) | Transmission concession contracts within the scope of IFRIC 12, under which Cemig has the right to receive cash and therefore, recognizes a concession financial assets.
(4) | Concession contracts that are within the scope of IFRIC 12 and under which the concession infrastructure assets are recorded under the intangible and financial assets bifurcation model.
Schedule of Concession and Amount to Be Paid | In obtaining the concessions for certain generation projects, Cemig GT is required to make payments to the regulator, over the period of the concession contract. Details on the concessions and the amounts to be paid are as follows:
Project |  | Percentage interest |  |  | Nominal value in 2017 |  |  | Present value in 2017 |  |  | Amortization period |  |  | Inflation index to be used to adjust historical amounts
Irapé |  |  | 100.00 |  |  |  | 33 |  |  |  | 14 |  |  |  | 03/2006 – 02/2035 |  |  | IGP-M
Queimado (Consortium) |  |  | 82.50 |  |  |  | 8 |  |  |  | 4 |  |  |  | 01/2004 – 12/2032 |  |  | IGP-M
Salto Morais Small Hydro Plant |  |  | 100.00 |  |  |  | — |  |  |  | — |  |  |  | 06/2013 – 07/2020 |  |  | IPCA
Rio de Pedras Small Hydro Plant |  |  | 100.00 |  |  |  | 1 |  |  |  | — |  |  |  | 06/2013 – 09/2024 |  |  | IPCA
Various Small Hydro Plants (*) |  |  | 100.00 |  |  |  | 3 |  |  |  | 3 |  |  |  | 06/2013 – 08/2025 |  |  | IPCA
(*) | Luiz Dias, Poço Fundo, São Bernardo and Xicão.
Schedule of Present Value and Nominal Value Portion to Be paid | The amounts paid to the grantor in 2017, the present value and the nominal value of the portions to be paid in the next 12 months, are as follows:
Project |  | Percentage interest |  |  | Amounts paid in 2017 |  | Present value of amounts to be paid in the next 12 months |  | Nominal value of amounts to be paid in 12 months
Irapé |  |  | 100.00 |  |  | 2 |  | 2 |  | 2
Queimado (Consortium) |  |  | 82.50 |  |  | 1 |  | 1 |  | 1
Salto Morais, Rio de Pedras and Others |  |  | 100.00 |  |  | 1 |  | 1 |  | 1

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