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Investments (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure Of Joint Ventures [Line Items] |  |
Investments, beginning | R$ 3,511,797 | R$ 3,325,731
Equity | 281,202 | 307,809
Investment AFAC |  | 10,780
Capital decrease | (37,129) |
Amortization |  | (370)
Dividends and JSCP | (175,636) | (132,065)
Other | (2,297) | (88)
Investments, ending | 3,577,937 | 3,511,797
Total for all associates [Member] |  |
Disclosure Of Joint Ventures [Line Items] |  |
Investments, beginning | 48,856 | 47,093
Equity | 19,783 | 22,001
Investment AFAC |  | 0
Capital decrease | 0 |
Amortization |  | 0
Dividends and JSCP | (16,839) | (20,238)
Other | (1,929) | 0
Investments, ending | 49,871 | 48,856
Investment property [Member] |  |
Disclosure Of Joint Ventures [Line Items] |  |
Investments, beginning | 444 | 535
Equity | 0 | 0
Investment AFAC |  | 0
Capital decrease | 0 |
Amortization |  | (3)
Dividends and JSCP | 0 | 0
Other | (1) | (88)
Investments, ending | 443 | 444
Dona Francisca Energetica [Member] | Total for all associates [Member] |  |
Disclosure Of Joint Ventures [Line Items] |  |
Investments, beginning | 30,812 | 28,043
Equity | 5,354 | 5,353
Investment AFAC |  | 0
Capital decrease | 0 |
Amortization |  | 0
Dividends and JSCP | (1,441) | (2,584)
Other | 0 | 0
Investments, ending | 34,725 | 30,812
Foz Do Chopim Energetica [Member] | Total for all associates [Member] |  |
Disclosure Of Joint Ventures [Line Items] |  |
Investments, beginning | 16,113 | 17,116
Equity | 14,431 | 16,651
Investment AFAC |  | 0
Capital decrease | 0 |
Amortization |  | 0
Dividends and JSCP | (15,398) | (17,654)
Other | 0 | 0
Investments, ending | 15,146 | 16,113
Others [Member] | Total for all associates [Member] |  |
Disclosure Of Joint Ventures [Line Items] |  |
Investments, beginning | 1,931 | 1,934
Equity | (2) | (3)
Investment AFAC |  | 0
Capital decrease | 0 |
Amortization |  | 0
Dividends and JSCP | 0 | 0
Other | (1,929) | 0
Investments, ending | 0 | 1,931
Total for all joint ventures [Member] |  |
Disclosure Of Joint Ventures [Line Items] |  |
Investments, beginning | 3,462,497 | 3,278,103
Equity | 261,419 | 285,808
Investment AFAC |  | 10,780
Capital decrease | (37,129) |
Amortization |  | (367)
Dividends and JSCP | (158,797) | (111,827)
Other | (367) | 0
Investments, ending | 3,527,623 | 3,462,497
Total for all joint ventures [Member] | Voltalia Sao Miguel Do Gostoso I [Member] |  |
Disclosure Of Joint Ventures [Line Items] |  |
Investments, beginning | 117,484 | 115,976
Equity | (1,259) | 1,508
Investment AFAC |  | 0
Capital decrease | 0 |
Amortization |  | 0
Dividends and JSCP | 0 | 0
Other | 0 | 0
Investments, ending | 116,225 | 117,484
Total for all joint ventures [Member] | Voltalia Sao Miguel Do Gostoso Direito De Authorization Rights [Member] |  |
Disclosure Of Joint Ventures [Line Items] |  |
Investments, beginning | 8,570 | 8,937
Equity | 0 | 0
Investment AFAC |  | 0
Capital decrease | 0 |
Amortization |  | (367)
Dividends and JSCP | 0 | 0
Other | (367) | 0
Investments, ending | 8,203 | 8,570
Total for all joint ventures [Member] | Caiua [Member] |  |
Disclosure Of Joint Ventures [Line Items] |  |
Investments, beginning | 133,074 | 125,297
Equity | 12,641 | 12,263
Investment AFAC |  | 0
Capital decrease | 0 |
Amortization |  | 0
Dividends and JSCP | (7,017) | (4,486)
Other | 0 | 0
Investments, ending | 138,698 | 133,074
Total for all joint ventures [Member] | Integracao Maranhense [Member] |  |
Disclosure Of Joint Ventures [Line Items] |  |
Investments, beginning | 212,060 | 192,502
Equity | 18,623 | 24,218
Investment AFAC |  | 10,780
Capital decrease | 0 |
Amortization |  | 0
Dividends and JSCP | (16,209) | (15,440)
Other | 0 | 0
Investments, ending | 214,474 | 212,060
Total for all joint ventures [Member] | Matrincha [Member] |  |
Disclosure Of Joint Ventures [Line Items] |  |
Investments, beginning | 994,999 | 931,528
Equity | 79,117 | 77,493
Investment AFAC |  | 0
Capital decrease | 0 |
Amortization |  | 0
Dividends and JSCP | (44,918) | (14,022)
Other | 0 | 0
Investments, ending | 1,029,198 | 994,999
Total for all joint ventures [Member] | Guaraciaba [Member] |  |
Disclosure Of Joint Ventures [Line Items] |  |
Investments, beginning | 492,083 | 467,099
Equity | 31,193 | 30,871
Investment AFAC |  | 0
Capital decrease | 0 |
Amortization |  | 0
Dividends and JSCP | (5,362) | (5,887)
Other | 0 | 0
Investments, ending | 517,914 | 492,083
Total for all joint ventures [Member] | Paranaiba [Member] |  |
Disclosure Of Joint Ventures [Line Items] |  |
Investments, beginning | 292,022 | 263,979
Equity | 29,908 | 36,269
Investment AFAC |  | 0
Capital decrease | 0 |
Amortization |  | 0
Dividends and JSCP | (8,324) | (8,226)
Other | 0 | 0
Investments, ending | 313,606 | 292,022
Total for all joint ventures [Member] | Mata De Santa Genebra [Member] |  |
Disclosure Of Joint Ventures [Line Items] |  |
Investments, beginning | 736,685 | 692,260
Equity | 48,533 | 58,262
Investment AFAC |  | 0
Capital decrease | (37,129) |
Amortization |  | 0
Dividends and JSCP | (53,038) | (13,837)
Other | 0 | 0
Investments, ending | 695,051 | 736,685
Total for all joint ventures [Member] | Cantareira [Member] |  |
Disclosure Of Joint Ventures [Line Items] |  |
Investments, beginning | 468,311 | 473,369
Equity | 42,448 | 44,563
Investment AFAC |  | 0
Capital decrease | 0 |
Amortization |  | 0
Dividends and JSCP | (23,840) | (49,621)
Other | 0 | 0
Investments, ending | 486,919 | 468,311
Total for all joint ventures [Member] | Solar Parana [Member] |  |
Disclosure Of Joint Ventures [Line Items] |  |
Investments, beginning | 7,209 | 7,156
Equity | 215 | 361
Investment AFAC |  | 0
Capital decrease | 0 |
Amortization |  | 0
Dividends and JSCP | (89) | (308)
Other | 0 | 0
Investments, ending | R$ 7,335 | R$ 7,209

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