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Principles of Consolidation (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Schedule of Companies Direct Equity Investments

The following subsidiaries are included in the consolidated financial statements:

 

Subsidiary 

    Form of
valuation		      2018      2017  
   Direct
interest, %		      Indirect
interest, %		      Direct
interest, %		      Indirect
interest, %		  

Cemig Geração e Transmissão

      Consolidation        100.00        —          100.00        —    

Cemig Distribuição

      Consolidation        100.00        —          100.00        —    

Gasmig

      Consolidation        99.57        —          99.57        —    

Cemig Telecom (1)

      Consolidation        —          —          100.00        —    

Cemig Geração Distribuída (Usina Térmica Ipatinga)

      Consolidation        100.00        —          100.00        —    

Efficientia

      Consolidation        100.00        —          100.00        —    

Luce Empreendimentos e Participações S.A.

      Consolidation        100.00        —          100.00        —    

Rio Minas Energia e Participações

      Consolidation        100.00        —          75.00        —    

Light (2)

      Consolidation        26.06        23.93        26.06        22.80  

LightGer (3)

      Consolidation        —          74.49        —          73.92  

Guanhães (3)

      Consolidation        —          74.49        —          73.92  

Axxion (3)

      Consolidation        49.00        25.49        49.00        24.92  

UHE Itaocara (3)

      Consolidation        —          74.49        —          73.92  

 

(1)

Merged with Cemig on March 31, 2018.
(2)

In December 2018, the Company obtained control of Light, holding an equity interest of 49.99%. As of December 31, 2018, Light is classified as a discontinued operation. See more information in Notes 17.1 and 33.
(3)

As a result of acquiring control of Light, also obtained control on these entities and classified it as discontinued operations. See more information in Notes 17.1 and 33.