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INTANGIBLE ASSETS (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$ 12,953 |  | R$ 11,810 |  | R$ 11,624 |
Amortization | (956) |  | (829) |  | (744) |
Ending balance | 14,621 |  | 12,953 |  | 11,810 |
Disposals | (57) |  | (23) |  | (24) | [1]
Transfer | 2,562 | [2] | 912 | [2] | 913 | [3]
Additions | 119 |  | 1,083 |  | 41 |
Intangible assets under development [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Beginning balance | 161 |  | 113 |  | 82 |
Ending balance | 206 |  | 161 |  | 113 |
Transfer | (61) | [2] | (3) | [2] | (10) | [3]
Additions | 106 |  | 51 |  | 41 |
Temporary Easements Intangible Assets [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Beginning balance | 10 |  | 9 |  | 8 |
Amortization | (1) |  | (1) |  |  |
Ending balance | 9 |  | 10 |  | 9 |
Transfer |  |  | 2 | [2] | 1 | [3]
Service concession rights [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Beginning balance | 5 |  | 6 |  | 7 |
Amortization | (1) |  | (1) |  | (1) |
Ending balance | 4 |  | 5 |  | 6 |
Assets Of Concession [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Beginning balance | 11,807 |  | 11,674 |  | 11,517 |
Amortization | (817) |  | (757) |  | (738) |
Ending balance | 13,555 |  | 11,807 |  | 11,674 |
Disposals | (57) |  | (23) |  | (24) | [1]
Transfer | 2,622 | [2] | 913 | [2] | 919 | [3]
Assets Of Concession G S F [Member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Beginning balance | 966 |  |  |  |  |
Amortization | (134) |  | (66) |  |  |
Ending balance | 832 |  | 966 |  |  |
Additions |  |  | 1,032 |  |  |
Other intangible assets [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Beginning balance | 4 |  | 8 |  | 10 |
Amortization | (3) |  | (4) |  | (5) |
Ending balance | 15 |  | 4 |  | 8 |
Transfer | 1 | [2] |  |  | 3 | [3]
Additions | 13 |  |  |  |  |
Useful Life Defined Intangible Asset [member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Beginning balance | 12,792 |  | 11,697 |  | 11,542 |
Amortization | (956) |  | (829) |  | (744) |
Ending balance | 14,415 |  | 12,792 |  | 11,697 |
Disposals | (57) |  | (23) |  | (24) | [1]
Transfer | 2,623 | [2] | 915 | [2] | R$ 923 | [3]
Additions | R$ 13 |  | R$ 1,032 |  |  |
[1] | This includes the impairment reversal, in the amount of R$14, recognized in the Income Statement under “Other expenses”, as a result of the test of impairment of intangible assets, relating to the authorization for wind power generation granted to Volta do Rio, on December 31, 2020. More information is available on this note.
[2] | The transfers were made between concession contract assets to Intangible assets: in 2022 of R$2,448 (R$902 in 2021).
[3] | The transfers were made between Intangible assets, concession contract assets, financial assets and property, plant and equipment are as follows: (1) R$906 from concession contract assets to intangible assets; (2) R$2 from property, plant and equipment to intangible assets; and (3) R$5 from concession financial asset to intangible assets.

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