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3. PRINCIPLES OF CONSOLIDATION (Details)

12 Months Ended

Dec. 31, 2020

Dec. 31, 2019

Cemig Geracao E Transmissao [member]

Disclosure of subsidiaries [line items]

Form of valuation

Consolidation

Consolidation

Percentage of ownership in subsidiary direct interest

100.00%

100.00%

Percentage of ownership in subsidiary indirect interest

Cemig Distribuicao SA [member]

Disclosure of subsidiaries [line items]

Form of valuation

Consolidation

Consolidation

Percentage of ownership in subsidiary direct interest

100.00%

100.00%

Percentage of ownership in subsidiary indirect interest

Gasmig [member]

Disclosure of subsidiaries [line items]

Form of valuation

Consolidation

Consolidation

Percentage of ownership in subsidiary direct interest

99.57%

99.57%

Percentage of ownership in subsidiary indirect interest

Cemig Geracao Distribuida (Usina Termica Ipatinga) [member]

Disclosure of subsidiaries [line items]

Form of valuation

^[1]

Consolidation

Consolidation

Percentage of ownership in subsidiary direct interest

^[1]

100.00%

100.00%

Percentage of ownership in subsidiary indirect interest

Cemig Sim (Efficientia) [member]

Disclosure of subsidiaries [line items]

Form of valuation

^[2]

Consolidation

Consolidation

Percentage of ownership in subsidiary direct interest

^[2]

100.00%

100.00%

Percentage of ownership in subsidiary indirect interest

Centroeste [member]

Disclosure of subsidiaries [line items]

Form of valuation

^[3]

Consolidation

Equity method

Percentage of ownership in subsidiary direct interest

^[3]

100.00%

51.00%

Percentage of ownership in subsidiary indirect interest

[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 Solucoes 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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