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3. PRINCIPLES OF CONSOLIDATION (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of subsidiaries [abstract] |
Schedule of companies direct equity investments | The following subsidiaries are included in the consolidated financial statements:
Subsidiary |  | Form of valuation |  | 2020 |  | Form of valuation |  | 2019
|  |  | Direct interest, % |  |  |  | Indirect interest, % |  |  |  |  | Direct interest, % |  |  |  | Indirect interest, % |
Cemig Geração e Transmissão |  |  | Consolidation |  |  |  | 100.00 |  |  |  | — |  |  | Consolidation |  |  | 100.00 |  |  |  | — |
Cemig Distribuição |  |  | Consolidation |  |  |  | 100.00 |  |  |  | — |  |  | Consolidation |  |  | 100.00 |  |  |  | — |
Gasmig |  |  | Consolidation |  |  |  | 99.57 |  |  |  | — |  |  | Consolidation |  |  | 99.57 |  |  |  | — |
Cemig Geração Distribuída (Usina Térmica Ipatinga) (1) |  |  | — |  |  |  | — |  |  |  | — |  |  | Consolidation |  |  | 100.00 |  |  |  | — |
Cemig Sim (Efficientia) (2) |  |  | Consolidation |  |  |  | 100.00 |  |  |  | — |  |  | Consolidation |  |  | 100.00 |  |  |  | — |
Centroeste (3) |  |  | Consolidation |  |  |  | 100.00 |  |  |  | — |  |  | Equity method |  |  | 51.00 |  |  |  | — |
| (1) | On October 19, 2020, an Extraordinary General Meeting of Shareholders approved the merger of this wholly-owned subsidiary, at book value, and as a result the investee ceased to exist and the Company took over of all its rights and liabilities.
| (2) | On April 14, 2020, the Annual Shareholders General Meeting decided to change this subsidiary’s By-laws, changing the name of this subsidiary to Cemig Soluções Inteligentes em Energia S.A.-Cemig Sim.
| (3) | On January 13, 2020, the Company concluded acquisition of the equity interest of 49% of the share capital held by Eletrobras in Centroeste, resulting in its now holding 100% of that investee. More details see notes 1 and 16.

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