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INVESTMENTS (Details 1) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | R$ 4,923 |  | R$ 5,385 |  | R$ 5,378 |
Gain (loss) by equity method (Income statement) |  | 845 |  | 182 |  | 357 | [1]
Dividends |  | (519) |  | (654) |  | (399) |
Ending balance |  | 5,107 |  | 4,923 |  | 5,385 |
Other |  | (193) |  | (6) |  | 13 |
Additions / acquisitions |  | 51 |  | 56 |  | 119 |
Losses on investments |  |  |  | (40) |  |  |
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) |  |  |  |  |  | 37 |
Disposals |  |  |  |  |  | (120) |
Hidreletrica cachoeirao [member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 59 |  | 53 |  | 54 |
Gain (loss) by equity method (Income statement) |  | 15 |  | 14 |  | 9 | [1]
Dividends |  | (27) |  | (8) |  | (10) |
Ending balance |  | 47 |  | 59 |  | 53 |
Guanhaes Energia [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 125 |  | 131 | [2] | 131 | [2]
Gain (loss) by equity method (Income statement) |  | 58 |  | (6) |  |  |
Ending balance |  | 183 |  | 125 |  | 131 | [2]
Hidreletrica pipoca [member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 47 |  | 36 |  | 31 |
Gain (loss) by equity method (Income statement) |  | 16 |  | 11 |  | 11 | [1]
Dividends |  | (16) |  |  |  | (6) |
Ending balance |  | 47 |  | 47 |  | 36 |
M E S A [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |
Gain (loss) by equity method (Income statement) |  | 10 |  |  |  |  |
Ending balance |  | 10 |  |  |  |  |
Fip Melbourne [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  | [3],[4] | 158 |  | 385 |
Gain (loss) by equity method (Income statement) |  | 169 | [3],[4] | (158) |  | (227) | [1]
Ending balance |  | 8 | [3],[4] |  | [3],[4] | 158 |
Other | [3],[4] | (161) |  |  |  |  |
Lightger [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 124 |  | 131 | [2] | 128 | [2]
Gain (loss) by equity method (Income statement) |  | 17 |  | 5 |  | 10 | [1],[2]
Dividends |  | (7) |  | (12) |  | (7) | [2]
Ending balance |  | 134 |  | 124 |  | 131 | [2]
Baguari Energia [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 168 |  | 159 |  | 157 |
Gain (loss) by equity method (Income statement) |  | 22 |  | 31 |  | 23 | [1]
Dividends |  | (30) |  | (22) |  | (21) |
Ending balance |  | 160 |  | 168 |  | 159 |
Amazonia Energia [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 933 | [5] | 965 |  | 1,028 |
Gain (loss) by equity method (Income statement) |  | (47) | [5] | (32) |  | (63) | [1]
Ending balance |  | 886 | [5] | 933 | [5] | 965 |
Alianca norte (belo monte plant) [member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 609 | [5] | 631 |  | 671 |
Gain (loss) by equity method (Income statement) |  | (33) | [5] | (22) |  | (40) | [1]
Ending balance |  | 576 | [5] | 609 | [5] | 631 |
Ativas [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 16 |  |  |  |  |
Gain (loss) by equity method (Income statement) |  | (1) |  |  |  |  |
Ending balance |  |  |  | 16 |  |  |
Other |  | (15) |  |  |  |  |
Taesa [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 1,580 |  | 1,467 |  | 1,213 |
Gain (loss) by equity method (Income statement) |  | 305 |  | 481 |  | 494 | [1]
Dividends |  | (336) |  | (368) |  | (240) |
Ending balance |  | 1,549 |  | 1,580 |  | 1,467 |
Alianca Geracao [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 1,141 |  | 1,167 |  | 1,192 |
Gain (loss) by equity method (Income statement) |  | 104 |  | 199 |  | 89 | [1]
Dividends |  | (48) |  | (225) |  | (114) |
Ending balance |  | 1,194 |  | 1,141 |  | 1,167 |
Other |  | (3) |  |  |  |  |
Retiro Baixo [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 201 |  | 195 |  | 180 |
Gain (loss) by equity method (Income statement) |  | 22 |  | 13 |  | 15 | [1]
Dividends |  | (38) |  | (7) |  |  |
Ending balance |  | 185 |  | 201 |  | 195 |
U F V Janauba Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 3 |  | 10 |  | 10 |
Gain (loss) by equity method (Income statement) |  | 1 |  | 1 |  | 1 | [1]
Dividends |  | (1) |  | (2) |  | (1) |
Ending balance |  | 3 |  | 3 |  | 10 |
Other |  |  |  | (6) |  |  |
U F V Corinto Geracao De Energia Eletrica Distriiuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 9 | [6] | 10 |  |  |
Gain (loss) by equity method (Income statement) |  | 2 | [6] |  |  | 1 | [1]
Dividends |  | (2) | [6] | (1) |  |  |
Ending balance |  | 8 | [6] | 9 | [6] | 10 |
Other | [6] | (1) |  |  |  |  |
Additions / acquisitions |  |  |  |  |  | 9 |
U F V Manga Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 11 | [6] | 11 |  |  |
Gain (loss) by equity method (Income statement) |  | 3 | [6] | 2 |  | 1 | [1]
Dividends |  | (2) | [6] | (2) |  |  |
Ending balance |  | 11 | [6] | 11 | [6] | 11 |
Other | [6] | (1) |  |  |  |  |
Additions / acquisitions |  |  |  |  |  | 10 |
U F V Bonfinopolis I I Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 6 | [6] | 6 |  |  |
Gain (loss) by equity method (Income statement) | [6] | 1 |  |  |  |  |
Dividends | [6] | (1) |  |  |  |  |
Ending balance |  | 5 | [6] | 6 | [6] | 6 |
Other | [6] | (1) |  |  |  |  |
Additions / acquisitions |  |  |  |  |  | 6 |
U F V Lagoa Grande Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 15 | [6] | 15 |  |  |
Gain (loss) by equity method (Income statement) |  | 3 | [6] | 2 |  | 3 | [1]
Dividends |  | (2) | [6] | (2) |  |  |
Ending balance |  | 15 | [6] | 15 | [6] | 15 |
Other | [6] | (1) |  |  |  |  |
Additions / acquisitions |  |  |  |  |  | 12 |
U F V Lontra Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 18 | [6] | 17 |  |  |
Gain (loss) by equity method (Income statement) |  | 4 | [6] | 1 |  | 3 | [1]
Dividends | [6] | (3) |  |  |  |  |
Ending balance |  | 18 | [6] | 18 | [6] | 17 |
Other | [6] | (1) |  |  |  |  |
Additions / acquisitions |  |  |  |  |  | 14 |
U F V Mato Verde Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 6 | [6] | 6 |  |  |
Gain (loss) by equity method (Income statement) |  | 1 | [6] | 1 |  | 1 | [1]
Dividends |  | (1) | [6] | (1) |  |  |
Ending balance |  | 6 | [6] | 6 | [6] | 6 |
Additions / acquisitions |  |  |  |  |  | 5 |
U F V Mirabela Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 4 | [6] | 4 |  |  |
Gain (loss) by equity method (Income statement) |  | 1 | [6] | 1 |  |  |
Dividends |  | (1) | [6] | (1) |  |  |
Ending balance |  | 4 | [6] | 4 | [6] | 4 |
Other |  |  |  |  |  | (1) |
Additions / acquisitions |  |  |  |  |  | 5 |
U F V Porteirinha I Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 5 | [6] | 6 |  |  |
Gain (loss) by equity method (Income statement) | [6] | 1 |  |  |  |  |
Dividends |  | (1) | [6] | (1) |  |  |
Ending balance |  | 4 | [6] | 5 | [6] | 6 |
Other | [6] | (1) |  |  |  |  |
Additions / acquisitions |  |  |  |  |  | 6 |
U F V Porteirinha I I Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 7 | [6] | 7 |  |  |
Gain (loss) by equity method (Income statement) |  | 1 | [6] | 1 |  | 1 | [1]
Dividends |  | (1) | [6] | (1) |  |  |
Ending balance |  | 7 | [6] | 7 | [6] | 7 |
Additions / acquisitions |  |  |  |  |  | 6 |
U F V Brasilandia Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance | [7] | 15 | [6] |  |  |  |
Gain (loss) by equity method (Income statement) |  | 3 | [6] | 4 | [7] |  |
Dividends |  | (2) | [6] | (1) | [7] |  |
Ending balance |  | 15 | [6] | 15 | [6],[7] |  | [7]
Other | [6] | (1) |  |  |  |  |
Additions / acquisitions | [7] |  |  | 12 |  |  |
Apolo I S P E Empreendimentos E Energia [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |
Gain (loss) by equity method (Income statement) |  | 1 |  |  |  |  |
Ending balance |  | 7 |  |  |  |  |
Additions / acquisitions |  | 6 |  |  |  |  |
U F V Campo Lindo I [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |
Gain (loss) by equity method (Income statement) |  | 1 |  |  |  |  |
Ending balance |  | 8 |  |  |  |  |
Additions / acquisitions |  | 7 |  |  |  |  |
U F V Campo Lindo I I [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |
Gain (loss) by equity method (Income statement) |  | 2 |  |  |  |  |
Ending balance |  | 9 |  |  |  |  |
Additions / acquisitions |  | 7 |  |  |  |  |
U F V Olaria I [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |
Gain (loss) by equity method (Income statement) |  | 1 |  |  |  |  |
Ending balance |  | 8 |  |  |  |  |
Additions / acquisitions |  | 7 |  |  |  |  |
Axxiom [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 4 |  |  |  |  |
Gain (loss) by equity method (Income statement) |  | (4) |  |  |  |  |
Ending balance |  |  |  | 4 |  |  |
Itaocara [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |
Gain (loss) by equity method (Income statement) |  | (3) |  |  |  |  |
Ending balance |  |  |  |  |  |  |
Other |  | (7) |  |  |  |  |
Additions / acquisitions |  | 10 |  |  |  |  |
Total of investments [member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 5,106 |  | 5,415 |  | 5,400 |
Gain (loss) by equity method (Income statement) |  | 676 |  | 337 |  | 366 | [1]
Dividends |  | (519) |  | (654) |  | (399) |
Ending balance |  | 5,107 |  | 5,106 |  | 5,415 |
Other |  | (193) |  | (6) |  | 13 |
Additions / acquisitions |  | 37 |  | 14 |  | 118 |
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) |  |  |  |  |  | 37 |
Disposals |  |  |  |  |  | (120) |
Itaocara Overdraft Liability [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Gain (loss) by equity method (Income statement) |  | 7 |  |  |  |  |
Additions / acquisitions |  | 14 |  |  |  |  |
Beginning balance |  | (21) |  |  |  |  |
Ending balance |  |  |  | (21) |  |  |
M E S A Loss Provisions [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Gain (loss) by equity method (Income statement) | [8] | 162 |  |  |  |  |
Beginning balance | [8] | (162) |  |  |  |  |
Ending balance | [8] |  |  | (162) |  |  |
Madeira Energia 1 [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  | 209 |  | 167 |
Gain (loss) by equity method (Income statement) |  |  |  | (209) |  | 42 | [1]
Ending balance |  |  |  |  |  | 209 |
Ativas Data Center [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 16 |  | 17 |  | 16 |
Gain (loss) by equity method (Income statement) |  |  |  | (1) |  | 1 | [1]
Ending balance |  |  |  | 16 |  | 17 |
Axxiom Solucoes Tecnologicas [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 4 |  | 4 | [2] | 13 | [2]
Gain (loss) by equity method (Income statement) |  |  |  | (2) |  | (9) | [1],[2]
Ending balance |  |  |  | 4 |  | 4 | [2]
Additions / acquisitions |  |  |  | 2 |  |  |
Itaocara Equity Deficit [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Gain (loss) by equity method (Income statement) |  |  |  | 7 | [9] | (9) | [1],[10]
Additions / acquisitions |  |  |  | 42 | [9] | 1 | [10]
Beginning balance |  | (21) | [9] | (30) | [9],[10] | (22) | [10]
Ending balance | [9] |  |  | (21) |  | (30) | [10]
Losses on investments | [9] |  |  | (40) |  |  |
Madeira Energia Provisions To Losses [Member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Gain (loss) by equity method (Income statement) | [11] |  |  | (162) |  |  |
Beginning balance | [11] | R$ (162) |  |  |  |  |
Ending balance | [11] |  |  | (162) |  |  |
Companhia de transmissao centroeste de minas [member] |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  | 24 |
Gain (loss) by equity method (Income statement) | [1] |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |
Other |  |  |  |  |  | 14 |
Additions / acquisitions |  |  |  |  |  | 45 |
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) |  |  |  |  |  | 37 |
Disposals |  |  |  |  |  | R$ (120) |
[1] | Includes bargain purchase related to the acquisition of the joint-controlled entities UFV Corinto, UFV Manga, UFV Lagoa Grande, UFV Lontra, UFV Mato Verde and UFV Porteirinha II, in the amount of R$7.
[2] | With the cessation of control of Light, the remaining equity interest in these investees was recognized as an investment in affiliates or jointly controlled subsidiaries, and measured by the equity method, in accordance with IFRS 10. More details see Notes 1 and 32.
[3] | Indirect participation in the Santo Antônio Plant through these investees.
[4] | On September 12, 2022, AGPar made the payment associated with the settlement arising from Arbitral Award CCBC-86/2016 to the Melbourne Fund. Thereafter, the Company recognized the receivable against income. Further details are provided throughout this note.
[5] | Indirect participation in Belo Monte Dam through these investees.
[6] | On May 23, 2022, the reduction of capital stock of these UFVs was approved by means of an Extraordinary General Assembly.
[7] | Includes the amount of R$2 of the acquisition of the jointly controlled subsidiary UFV Brasilândia.
[8] | In June 2022, the provision related to the Company's contractual obligations assumed with the investee and the other shareholders was reversed. Further details are disclosed in this note.
[9] | On December 1, 2021, CEMIG GT injected capital into UHE Itaocara S.A., in the amount of R$40. This amount is proportional to its shareholding interest in the investee and was recognized under Other expenses in the Company’s income statement. Further, R$1 was injected to cover the expenses specified in the 2021 budget of the investee.
[10] | On December 31, 2019, the investee had negative shareholders’ equity. Thus, after reducing the accounting book value of its interest to zero, the Company recognized the provision for losses on investments, in the amount of R$22, resulting from contractual obligations assumed with the subsidiary and the other shareholders.
[11] | A loss was recognized for extension of the contractual obligations which the Company had assumed to the investee and the other shareholders. On December 31, 2021 this amount was R$162.

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