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Principles of Consolidation (Tables) | 12 Months Ended
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Dec. 31, 2017
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Schedule of Companies Direct Equity Investments | The following subsidiaries and are included in the consolidated financial statements:
Subsidiary |  | 2017 |  | 2016 |  | 2015
| Direct interest, % |  | Direct interest, % |  | Direct interest, %
Cemig Geração e Transmissão |  | 100.00 |  | 100.00 |  | 100.00
Cemig Distribuição |  | 100.00 |  | 100.00 |  | 100.00
Gasmig |  | 99.57 |  | 99.57 |  | 99.57
CemigTelecom |  | 100.00 |  | 100.00 |  | 100.00
Rosal Energia |  | 100.00 |  | 100.00 |  | 100.00
Sá Carvalho |  | 100.00 |  | 100.00 |  | 100.00
Horizontes Energia |  | 100.00 |  | 100.00 |  | 100.00
Usina Térmica Ipatinga |  | 100.00 |  | 100.00 |  | 100.00
Cemig PCH |  | 100.00 |  | 100.00 |  | 100.00
Cemig Trading |  | 100.00 |  | 100.00 |  | 100.00
Efficientia |  | 100.00 |  | 100.00 |  | 100.00
Cemig Comercializadora de Energia Incentivada |  | 100.00 |  | 100.00 |  | 100.00
UTE Barreiro |  | 100.00 |  | 100.00 |  | 100.00
Empresa de Serviços e Comercialização de Energia Elétrica |  | 100.00 |  | 100.00 |  | 100.00

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