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Income and Social Contribution Taxes - Schedule of Deferred Income Tax and Social Contribution Tax (Details) - BRL (R$) R$ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Movement of deferred income tax and social contribution |  |  |
Deferred tax assets, Balance at beginning of period | R$ 4,424 | R$ 4,819 |
Deferred tax liabilities, Balance at beginning of period | (2,491) | (2,631) |
Deferred tax assets (liabilities), Balance at beginning of period | 1,933 | 2,188 |
Profit and loss | (744) | (142) |
Comprehensive income | (394) | (119) |
Others | (5) | 6 |
Deferred tax assets, Balance at end of period | 3,601 | 4,424 |
Deferred tax liabilities, Balance at end of period | (2,811) | (2,491) |
Deferred tax assets (liabilities), Balance at end of period | 790 | 1,933 |
Total assets | 2,334 | 3,045 | R$ 3,120
Total liabilities | (1,543) | (1,112) | R$ (932)
Deferred tax assets |  |  |
Movement of deferred income tax and social contribution |  |  |
Profit and loss | (429) | (282) |
Comprehensive income | (394) | (119) |
Others |  | 6 |
Deferred tax assets, Tax loss carryforwards |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax assets, Balance at beginning of period | 1,219 | 987 |
Profit and loss | (263) | 232 |
Comprehensive income |  |  |
Others |  |  |
Deferred tax assets, Balance at end of period | 956 | 1,219 |
Deferred tax assets, Provisions for contingencies |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax assets, Balance at beginning of period | 723 | 602 |
Profit and loss | (104) | 121 |
Comprehensive income |  |  |
Others |  |  |
Deferred tax assets, Balance at end of period | 619 | 723 |
Deferred tax assets, Impairment on investments |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax assets, Balance at beginning of period | 57 | 56 |
Profit and loss | (40) | 1 |
Comprehensive income |  |  |
Others |  |  |
Deferred tax assets, Balance at end of period | 17 | 57 |
Deferred tax assets, Fair value of derivative financial instruments (PUT SAAG) |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax assets, Balance at beginning of period |  | 229 |
Profit and loss |  | (229) |
Comprehensive income |  |  |
Others |  |  |
Deferred tax assets, Balance at end of period |  |  |
Deferred tax assets, Provision related to the exclusion of ICMS from the PIS/Pasep and Cofins calculation basis |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax assets, Balance at beginning of period | 88 | 598 |
Profit and loss | (88) | (510) |
Comprehensive income |  |  |
Others |  |  |
Deferred tax assets, Balance at end of period |  | 88 |
Deferred tax assets, Provision for income sharing payments |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax assets, Balance at beginning of period | 48 | 30 |
Profit and loss | (18) | 18 |
Comprehensive income |  |  |
Others |  |  |
Deferred tax assets, Balance at end of period | 30 | 48 |
Deferred tax assets, Post-employment obligations |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax assets, Balance at beginning of period | 1,812 | 1,852 |
Profit and loss | 47 | 79 |
Comprehensive income | (394) | (119) |
Others |  |  |
Deferred tax assets, Balance at end of period | 1,465 | 1,812 |
Deferred tax assets, Provision for expected credit losses |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax assets, Balance at beginning of period | 326 | 319 |
Profit and loss | 24 | 7 |
Comprehensive income |  |  |
Others |  |  |
Deferred tax assets, Balance at end of period | 350 | 326 |
Deferred tax assets, Onerous concession |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax assets, Balance at beginning of period | 12 | 12 |
Profit and loss |  |  |
Comprehensive income |  |  |
Others |  |  |
Deferred tax assets, Balance at end of period | 12 | 12 |
Deferred tax assets, Rights of use |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax assets, Balance at beginning of period | 126 | 117 |
Profit and loss | 8 | 9 |
Comprehensive income |  |  |
Others |  |  |
Deferred tax assets, Balance at end of period | 134 | 126 |
Deferred tax assets, Others |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax assets, Balance at beginning of period | 13 | 17 |
Profit and loss | 5 | (10) |
Comprehensive income |  |  |
Others |  | 6 |
Deferred tax assets, Balance at end of period | 18 | 13 |
Deferred tax liabilities |  |  |
Movement of deferred income tax and social contribution |  |  |
Profit and loss | (315) | 140 |
Comprehensive income |  |  |
Others | (5) |  |
Deferred tax liabilities, Deemed cost |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax liabilities, Balance at beginning of period | (155) | (156) |
Profit and loss | 8 | 1 |
Comprehensive income |  |  |
Others |  |  |
Deferred tax liabilities, Balance at end of period | (147) | (155) |
Deferred tax liabilities, Acquisition costs of equity interests |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax liabilities, Balance at beginning of period | (439) | (456) |
Profit and loss | 100 | 17 |
Comprehensive income |  |  |
Others |  |  |
Deferred tax liabilities, Balance at end of period | (339) | (439) |
Deferred tax liabilities, Borrowing costs capitalized |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax liabilities, Balance at beginning of period | (182) | (170) |
Profit and loss | (17) | (12) |
Comprehensive income |  |  |
Others |  |  |
Deferred tax liabilities, Balance at end of period | (199) | (182) |
Deferred tax liabilities, Adjustment to expectation of cash flow – Concession assets |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax liabilities, Balance at beginning of period | (334) | (263) |
Profit and loss | (53) | (71) |
Comprehensive income |  |  |
Others |  |  |
Deferred tax liabilities, Balance at end of period | (387) | (334) |
Deferred tax liabilities, Revenues arising from transmission contract asset |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax liabilities, Balance at beginning of period | (931) | (940) |
Profit and loss | (469) | 9 |
Comprehensive income |  |  |
Others |  |  |
Deferred tax liabilities, Balance at end of period | (1,400) | (931) |
Deferred tax liabilities, Adjustment to fair value: Swap/Loss |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax liabilities, Balance at beginning of period | (126) | (210) |
Profit and loss | 125 | 84 |
Comprehensive income |  |  |
Others |  |  |
Deferred tax liabilities, Balance at end of period | (1) | (126) |
Deferred tax liabilities, Reimbursement of costs – GSF |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax liabilities, Balance at beginning of period | (229) | (274) |
Profit and loss | 45 | 45 |
Comprehensive income |  |  |
Others |  |  |
Deferred tax liabilities, Balance at end of period | (184) | (229) |
Deferred tax liabilities, Lease liabilities |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax liabilities, Balance at beginning of period | (127) | (108) |
Profit and loss | 8 | (19) |
Comprehensive income |  |  |
Others |  |  |
Deferred tax liabilities, Balance at end of period | (119) | (127) |
Deferred tax liabilities, Others |  |  |
Movement of deferred income tax and social contribution |  |  |
Deferred tax liabilities, Balance at beginning of period | 32 | (54) |
Profit and loss | (62) | 86 |
Comprehensive income |  |  |
Others | (5) |  |
Deferred tax liabilities, Balance at end of period | R$ (35) | R$ 32 |

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