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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Classification by category of financial instruments (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Amortized cost |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial assets, at fair value | R$ 39,017,827 | R$ 24,673,081
Financial liabilities, at fair value | 109,460,695 | 100,988,575
Loans, financing and debentures |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial liabilities, at fair value | 59,297,533 | 54,299,620
Obligations of Law No. 14,182/2021 |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial liabilities, at fair value | 42,022,123 | 39,519,406
Suppliers |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial liabilities, at fair value | 2,764,288 | 2,963,867
Compulsory loan - Agreements |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial liabilities, at fair value | 1,105,534 | 896,746
RGR Returns |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial liabilities, at fair value | 932,250 | 1,319,921
Reimbursement obligations |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial liabilities, at fair value | 70,803 |
Shareholders Compensation |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial liabilities, at fair value | 2,490,668 | 1,154,836
Leases |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial liabilities, at fair value | 182,583 | 216,747
Concessions payable - use of public property |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial liabilities, at fair value | 594,913 | 617,432
Fair value through result |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial assets, at fair value | 11,537,109 | 6,726,501
Financial liabilities, at fair value | 17,500,976 | 7,138,184
Fair value through result | Loans, financing and debentures | Level 2 |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial liabilities, at fair value | 16,323,041 | 6,480,670
Fair value through result | Derivative financial instruments | Level 2 |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial liabilities, at fair value | 1,177,935 | 657,514
Cash and cash equivalents |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial assets, at fair value | 26,572,522 | 13,046,371
Accounts Receivable, net |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial assets, at fair value | 6,513,888 | 5,859,928
Restricted cash |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial assets, at fair value | 3,679,483 | 2,772,947
Reimbursement rights |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial assets, at fair value | 1,613,335 | 2,365,685
Loans and financing |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial assets, at fair value | 638,599 | 628,150
Financial investments | Fair value through result | Level 2 |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial assets, at fair value | 8,967,937 | 5,925,693
Beneficiary parties | Fair value through result | Level 2 |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial assets, at fair value | 417,242 | 427,202
Derivative financial instruments | Fair value through result | Level 2 |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial assets, at fair value | 2,151,930 | 373,606
Fair value through other comprehensive income |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial assets, at fair value | 946,059 | 1,104,381
Fair value through other comprehensive income | Derivative financial instruments | Level 2 |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial assets, at fair value | 84,825 |
Fair value through other comprehensive income | Investments (Interests) | Level 1 |  |
AMOUNTS RECEIVABLE - ENBpar |  |
Financial assets, at fair value | R$ 861,234 | R$ 1,104,381

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