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INVESTMENTS (Details 3) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
IfrsStatementLineItems [Line Items] |  |  |  |
Share capital |  | R$ 11,007 | R$ 8,467 |
Equity |  | R$ 21,784 | R$ 19,462 |
C E M I G Geracaoe Transmissao [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 2,896,785,358 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 5,474 | R$ 4,124 | R$ 4,000
Equity |  | R$ 8,893 | R$ 7,755 | R$ 5,842
M E S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares | [1] | 24,796,536,323 |  |
Cemig interest % | [1] | 7.53% | 15.51% | 15.51%
Share capital | [1] | R$ 12,202 | R$ 10,620 | R$ 10,620
Equity | [1] | R$ 229 | R$ 1,492 | R$ 2,259
Hidreletrica cachoeirao [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 35,000,000 |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00%
Share capital |  | R$ 35 | R$ 35 | R$ 35
Equity |  | R$ 96 | R$ 120 | R$ 110
Guanhaes Energia [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares | [2] | 548,626,000 |  |
Cemig interest % | [2] | 49.00% | 49.00% | 49.00%
Share capital | [2] | R$ 549 | R$ 549 | R$ 549
Equity | [2] | R$ 373 | R$ 255 | R$ 268
Hidreletrica pipoca [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 41,360,000 |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00%
Share capital |  | R$ 41 | R$ 41 | R$ 41
Equity |  | R$ 95 | R$ 93 | R$ 73
Baguari Energia [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares | [3] | 26,157,300,278 |  |
Cemig interest % | [3] | 69.39% | 69.39% | 69.39%
Share capital | [3] | R$ 187 | R$ 187 | R$ 187
Equity | [3] | R$ 231 | R$ 243 | R$ 229
Parajuru [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 85,834,843 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 86 | R$ 86 | R$ 71
Equity |  | R$ 158 | R$ 128 | R$ 107
Voltado Rio [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 274,867,441 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 275 | R$ 275 | R$ 117
Equity |  | R$ 248 | R$ 207 | R$ 171
Lightger [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 79,078,937 |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00%
Share capital |  | R$ 79 | R$ 79 | R$ 79
Equity |  | R$ 123 | R$ 98 | R$ 106
Alianca norte (belo monte plant) [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 41,949,320,044 |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00%
Share capital |  | R$ 1,210 | R$ 1,209 | R$ 1,209
Equity |  | R$ 1,084 | R$ 1,148 | R$ 1,189
Amazonia Energia [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares | [3],[4] | 1,322,897,723 |  |
Cemig interest % | [3],[4] | 74.50% | 74.50% | 74.50%
Share capital | [3],[4] | R$ 1,323 | R$ 1,323 | R$ 1,323
Equity | [3],[4] | R$ 1,189 | R$ 1,252 | R$ 1,296
Alianca Geracao [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 1,291,582,500 |  |
Cemig interest % |  | 45.00% | 45.00% | 45.00%
Share capital |  | R$ 1,291 | R$ 1,291 | R$ 1,291
Equity |  | R$ 2,039 | R$ 1,858 | R$ 1,858
Retiro Baixo [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 225,350,000 |  |
Cemig interest % |  | 49.90% | 49.90% | 49.90%
Share capital |  | R$ 225 | R$ 225 | R$ 225
Equity |  | R$ 319 | R$ 346 | R$ 325
Itaocara [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 156,259,500 |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00%
Share capital |  | R$ 207 | R$ 156 | R$ 72
Equity |  | R$ 15 | R$ (42) | R$ (60)
Cemig Baguari [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 406,000 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
C E M I G Geracao Tres Marias [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 1,291,423,369 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 1,291 | R$ 1,291 | R$ 1,291
Equity |  | R$ 1,728 | R$ 1,652 | R$ 1,452
Cemig Ger Salto Grande S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 405,267,607 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 405 | R$ 405 | R$ 405
Equity |  | R$ 562 | R$ 527 | R$ 455
Cemig Ger Itutinga S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 151,309,332 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 151 | R$ 151 | R$ 151
Equity |  | R$ 231 | R$ 212 | R$ 180
Cemig Geracao Camargos S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 113,499,102 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 113 | R$ 113 | R$ 113
Equity |  | R$ 183 | R$ 165 | R$ 144
Cemig Geracao Sul S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 148,146,505 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 148 | R$ 148 | R$ 148
Equity |  | R$ 252 | R$ 215 | R$ 174
Cemig Geracao Leste S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 100,568,929 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 101 | R$ 101 | R$ 101
Equity |  | R$ 168 | R$ 148 | R$ 127
Cemig Geracao Oeste S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 60,595,484 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 61 | R$ 61 | R$ 61
Equity |  | R$ 126 | R$ 106 | R$ 84
Rosal Energia S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 46,944,467 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 47 | R$ 47 | R$ 47
Equity |  | R$ 123 | R$ 115 | R$ 127
Sa Carvalho S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 361,200,000 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 37 | R$ 37 | R$ 37
Equity |  | R$ 138 | R$ 134 | R$ 115
Horizontes Energia S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 39,257,563 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 39 | R$ 39 | R$ 39
Equity |  | R$ 61 | R$ 60 | R$ 55
Cemig P C H S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 45,952,000 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 46 | R$ 46 | R$ 46
Equity |  | R$ 99 | R$ 90 | R$ 90
Cemig Geracao Poco Fundo S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 97,161,578 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 139 | R$ 97 | R$ 1
Equity |  | R$ 172 | R$ 144 | R$ 4
Empresa De Servicos De Comercializacao De Energia Eletrica S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 486,000 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Equity |  | R$ 11 | R$ 8 | R$ 57
Cemig Trading S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 1,000,000 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 1 | R$ 1 | R$ 1
Equity |  | R$ 6 | R$ 2 | R$ 30
Centroeste [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 28,000,000 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 28 | R$ 28 | R$ 28
Equity |  | R$ 120 | R$ 122 | R$ 118
Cemig Distribuicao [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 2,359,113,452 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 5,372 | R$ 5,372 | R$ 5
Equity |  | R$ 7,105 | R$ 6,943 | R$ 6
Taesa [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 1,033,496,721 |  |
Cemig interest % |  | 21.68% | 21.68% | 21.68%
Share capital |  | R$ 3,042 | R$ 3,042 | R$ 3
Equity |  | R$ 6,570 | R$ 6,685 | R$ 6
Gasmig [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 409,255,483 |  |
Cemig interest % |  | 99.57% | 99.57% | 99.57%
Share capital |  | R$ 665 | R$ 665 | R$ 665
Equity |  | R$ 1,373 | R$ 1,222 | R$ 1
C E M I G Sim [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 112,420,992 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 175 | R$ 102 | R$ 24
Equity |  | R$ 199 | R$ 111 | R$ 94
Sete Lagoas [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 36,857,080 |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00%
Share capital |  | R$ 37 | R$ 37 |
Equity |  | R$ 73 | R$ 65 |
U F V Janauba [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 18,509,900 |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00%
Share capital |  | R$ 7 | R$ 7 | R$ 19
Equity |  | R$ 7 | R$ 6 | R$ 22
U F V Corinto [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 18,000,000 |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00%
Share capital |  | R$ 16 | R$ 18 | R$ 18
Equity |  | R$ 17 | R$ 19 | R$ 20
U F V Manga [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 21,235,933 |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00%
Share capital |  | R$ 19 | R$ 22 | R$ 21
Equity |  | R$ 21 | R$ 22 | R$ 24
U F V Bonfinopolis [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 13,197,187 |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00%
Share capital |  | R$ 12 | R$ 13 | R$ 13
Equity |  | R$ 13 | R$ 13 | R$ 13
U F V Lagoa Grande [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 25,471,844 |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00%
Share capital |  | R$ 23 | R$ 25 | R$ 25
Equity |  | R$ 25 | R$ 26 | R$ 26
U F V Lontra [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 29,010,219 |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00%
Share capital |  | R$ 27 | R$ 29 | R$ 29
Equity |  | R$ 29 | R$ 29 | R$ 29
U F V Mato Verde [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 11,030,391 |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00%
Share capital |  | R$ 10 | R$ 11 | R$ 11
Equity |  | R$ 11 | R$ 11 | R$ 12
U F V Mirabela [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 9,320,875 |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00%
Share capital |  | R$ 9 | R$ 9 | R$ 9
Equity |  | R$ 10 | R$ 9 | R$ 9
U F V Porteirinha I [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 12,348,392 |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00%
Share capital |  | R$ 11 | R$ 12 | R$ 12
Equity |  | R$ 11 | R$ 13 | R$ 13
U F V Porteirinha I I [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 11,702,733 |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00%
Share capital |  | R$ 11 | R$ 12 | R$ 12
Equity |  | R$ 12 | R$ 12 | R$ 12
U F V Brasilandia [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 25,629,900 |  |
Cemig interest % |  | 49.00% | 49.00% |
Share capital |  | R$ 24 | R$ 26 |
Equity |  | R$ 26 | R$ 27 |
U F V Prudentede Moraes [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 35,050,000 |  |
Cemig interest % |  | 100.00% |  |
Share capital |  | R$ 35 |  |
Equity |  | R$ 35 |  |
U F V Apolo I [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 8,258,980 |  |
Cemig interest % |  | 49.00% |  |
Share capital |  | R$ 8 |  |
Equity |  | R$ 9 |  |
U F V Campo Lindo I [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 13,323,845 |  |
Cemig interest % |  | 49.00% |  |
Share capital |  | R$ 13 |  |
Equity |  | R$ 13 |  |
U F V Campo Lindo I I [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 13,323,845 |  |
Cemig interest % |  | 49.00% |  |
Share capital |  | R$ 13 |  |
Equity |  | R$ 14 |  |
U F V Olaria I [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Number of shares |  | 13,323,845 |  |
Cemig interest % |  | 49.00% |  |
Share capital |  | R$ 13 |  |
Equity |  | R$ 13 |  |
[1] | Indirect participation in Santo Antônio Plant through this investee.
[2] | On June 23, 2022, Light concluded the sale of its equity interests in Guanhães Energia and Lightger to Brasal Energia S.A.. The operation consisted of the sale to Brasal Energia S.A. of the total interest held by Light representing 51% of the capital stock of Lightger and Guanhães Energia.
[3] | Joint venture based on shareholders’ agreement.
[4] | Indirect participation in Belo Monte Plant through this investee.

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