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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details) - BRL (R$) R$ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
IfrsStatementLineItems [Line Items] |  |
Financial assets | R$ 5,993 | R$ 6,474
Financial liabilities at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | (14,590) | (15,293)
Financial assets at fair value | (14,590) | (15,293)
Financial liabilities at fair value through profit or loss, category [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | (763) | (642)
Financial assets at fair value | (763) | (642)
Derivative Financial Instruments [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | (15,353) | (15,935)
Financial assets at fair value | (15,353) | (15,935)
Derivative Financial Instrument Assets Swaps [Member] | Level 3 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | (91) | (6)
Financial assets at fair value | (91) | (6)
Loans, financing and debentures [member] | Financial liabilities at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | (10,581) | (11,364)
Financial assets at fair value | (10,581) | (11,364)
Debt With Pension Fund Forluz [Member] | Financial liabilities at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | (251) | (385)
Financial assets at fair value | (251) | (385)
Debt With Pension Fund Forluz 1 [Member] | Financial liabilities at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | (545) | (539)
Financial assets at fair value | (545) | (539)
Concessions Payable [Member] | Financial liabilities at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | (27) | (27)
Financial assets at fair value | (27) | (27)
Suppliers [Member] | Financial liabilities at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | (2,832) | (2,683)
Financial assets at fair value | (2,832) | (2,683)
Leasing Transactions [Member] | Financial liabilities at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | (354) | (244)
Financial assets at fair value | (354) | (244)
Sector Financial Liabilities [Member] | Financial liabilities at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets |  | (51)
Financial assets at fair value |  | (51)
S A A G Put Options [Member] | Level 3 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | (672) | (636)
Financial assets at fair value | (672) | (636)
Financial assets at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 10,483 | 12,042
Financial assets at fair value | 10,483 | 12,042
Financial assets at amortised cost, class [member] | Securities Cash Investments One [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 380 | 1,095
Financial assets at fair value | 380 | 1,095
Financial assets at amortised cost, class [member] | Customers And Traders Concession Holders Transmission Service [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 4,812 | 4,482
Financial assets at fair value | 4,812 | 4,482
Financial assets at amortised cost, class [member] | Restricted Cash [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 16 | 19
Financial assets at fair value | 16 | 19
Financial assets at amortised cost, class [member] | Accounts Receivable From The State Of Minas Gerais [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 13 | 13
Financial assets at fair value | 13 | 13
Financial assets at amortised cost, class [member] | Concession Financial Assets C V A Account And Other Financial Components In Tariff Adjustments [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 944 | 2,148
Financial assets at fair value | 944 | 2,148
Financial assets at amortised cost, class [member] | Reimbursement Of Tariff Subsidy Payments [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets |  | 291
Financial assets at fair value |  | 291
Financial assets at amortised cost, class [member] | Escrow Deposits [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 1,207 | 47
Financial assets at fair value | 1,207 | 47
Financial assets at amortised cost, class [member] | Concession Grant Fee Generation Concessions [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 2,950 | 1,155
Financial assets at fair value | 2,950 | 1,155
Financial assets at amortised cost, class [member] | Agreement Between F I P Melbourne And A G Par [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 161 | 2,792
Financial assets at fair value | 161 | 2,792
Financial assets at fair value through profit or loss, category [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 16,129 | 16,487
Financial assets at fair value | 16,129 | 16,487
Financial assets at fair value through profit or loss, category [member] | Cash Equivalents Investments [Member] | Level 2 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 1,346 | 708
Financial assets at fair value | 1,346 | 708
Financial assets at fair value through profit or loss, category [member] | Bank Certificates Of Deposit [Member] | Level 2 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 191 | 101
Financial assets at fair value | 191 | 101
Financial assets at fair value through profit or loss, category [member] | Bank Financial Notes [Member] | Level 2 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 906 | 705
Financial assets at fair value | 906 | 705
Financial assets at fair value through profit or loss, category [member] | Marketable securities - treasury financial notes [member] | Level 1 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 402 | 178
Financial assets at fair value | 402 | 178
Marketable Securities [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 2,845 | 1,692
Financial assets at fair value | 2,845 | 1,692
Derivative Financial Instruments [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 5,646 | 4,445
Financial assets at fair value | 5,646 | 4,445
Derivative Financial Instruments [Member] | Derivative Financial Instrument Assets Swaps [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 703 | 1,219
Financial assets at fair value | 703 | 1,219
Derivative Financial Instruments [Member] | Concession Of Distribution Infrastructure [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 1,407 | 718
Financial assets at fair value | 1,407 | 718
Derivative Financial Instruments [Member] | Reimbursements Receivable Generation [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets | 691 | 816
Financial assets at fair value | R$ 691 | R$ 816

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