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3. PRINCIPLES OF CONSOLIDATION (Tables)

12 Months Ended

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
Subsidiary		Form of valuation					Direct interest, %				Indirect interest, %			Form of valuation			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.