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EQUITY AND REMUNERATION TO SHAREHOLDERS (Details) - shares | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 2,201,370,688 | 1,693,362,068 | 1,518,752,601
Percentage of changes in share capital | 100.00% | 100.00% | 100.00%
State of minas gerais [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 375,048,387 | 288,498,775 | 258,750,499
Percentage of changes in share capital | 17.00% | 17.00% | 17.00%
Other Entities Of Minas Gerais State [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 21,910,971 | 14,495,439 | 7,462,750
Percentage of changes in share capital | 1.00% | 1.00% |
F I A Dinamica Energia S A [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 352,396,700 | 233,359,090 | 158,147,949
Percentage of changes in share capital | 16.00% | 14.00% | 10.00%
B N D E S Participacoes [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 82,007,784 | 85,224,631 | 83,877,607
Percentage of changes in share capital | 4.00% | 5.00% | 6.00%
Black Rock [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 218,212,381 | 123,325,741 | 153,689,970
Percentage of changes in share capital | 10.00% | 7.00% | 10.00%
Other Shareholders In Brazil [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 204,766,598 | 189,570,960 | 268,421,971
Percentage of changes in share capital | 9.00% | 11.00% | 18.00%
Other Shareholders In Foreign [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 947,027,867 | 758,887,432 | 588,401,855
Percentage of changes in share capital | 43.00% | 45.00% | 39.00%
Common Shares [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 735,847,624 | 566,036,634 | 507,670,289
Percentage of changes in share capital | 100.00% | 100.00% | 100.00%
Common Shares [Member] | State of minas gerais [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 375,031,302 | 288,485,632 | 258,738,711
Percentage of changes in share capital | 51.00% | 51.00% | 51.00%
Common Shares [Member] | Other Entities Of Minas Gerais State [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 30,021 | 23,094 | 20,713
Common Shares [Member] | F I A Dinamica Energia S A [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 233,625,046 | 153,354,328 | 114,172,677
Percentage of changes in share capital | 31.00% | 27.00% | 22.00%
Common Shares [Member] | B N D E S Participacoes [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 82,007,784 | 63,082,911 | 56,578,175
Percentage of changes in share capital | 11.00% | 11.00% | 11.00%
Common Shares [Member] | Other Shareholders In Brazil [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 26,546,632 | 43,689,699 | 55,717,246
Percentage of changes in share capital | 4.00% | 8.00% | 11.00%
Common Shares [Member] | Other Shareholders In Foreign [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 18,606,839 | 17,400,970 | 22,442,767
Percentage of changes in share capital | 3.00% | 3.00% | 5.00%
Preference shares [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 1,465,523,064 | 1,127,325,434 | 1,011,082,312
Percentage of changes in share capital | 100.00% | 100.00% | 100.00%
Preference shares [member] | State of minas gerais [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 17,085 | 13,143 | 11,788
Preference shares [member] | Other Entities Of Minas Gerais State [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 21,880,950 | 14,472,345 | 7,442,037
Percentage of changes in share capital | 1.00% | 1.00% | 1.00%
Preference shares [member] | F I A Dinamica Energia S A [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 118,771,654 | 80,004,762 | 43,975,272
Percentage of changes in share capital | 8.00% | 7.00% | 4.00%
Preference shares [member] | B N D E S Participacoes [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued |  | 22,141,720 | 27,299,432
Percentage of changes in share capital |  | 2.00% | 3.00%
Preference shares [member] | Black Rock [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 218,212,381 | 123,325,741 | 153,689,970
Percentage of changes in share capital | 15.00% | 11.00% | 15.00%
Preference shares [member] | Other Shareholders In Brazil [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 178,219,966 | 145,881,261 | 212,704,725
Percentage of changes in share capital | 12.00% | 13.00% | 21.00%
Preference shares [member] | Other Shareholders In Foreign [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares issued | 928,421,028 | 741,486,462 | 565,959,088
Percentage of changes in share capital | 64.00% | 66.00% | 56.00%

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