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Investments (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
IfrsStatementLineItems [Line Items] |  |  |
Investments, beginning |  | R$ 3,042,134 | R$ 2,729,517
Equity |  | 478,577 | 366,314
Investment/advance for future capital increase |  | 4,829 | 30,970
Capital decrease |  | (61,536) |
Amortization |  | (371) | (372)
Dividends and JSCP |  | (137,900) | (84,033)
Other | [1] | (2) | (262)
Investments, ending |  | 3,325,731 | 3,042,134
Associates [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investments, beginning |  | 48,096 | 40,073
Equity |  | 26,015 | 25,167
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  | (27,018) | (17,144)
Other | [1] |  |
Investments, ending |  | 47,093 | 48,096
Investment property [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investments, beginning |  | 541 | 808
Equity |  |  |
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  | (4) | (5)
Dividends and JSCP |  |  |
Other | [1] | (2) | (262)
Investments, ending |  | 535 | 541
Dona Francisca Energetica [Member] | Associates [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investments, beginning |  | 27,057 | 28,147
Equity |  | 5,648 | 8,574
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  | (4,662) | (9,664)
Other | [1] |  |
Investments, ending |  | 28,043 | 27,057
Foz Do Chopim Energetica [Member] | Associates [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investments, beginning |  | 19,102 | 9,986
Equity |  | 20,370 | 16,596
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  | (22,356) | (7,480)
Other | [1] |  |
Investments, ending |  | 17,116 | 19,102
Others [Member] | Associates [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investments, beginning |  | 1,937 | 1,940
Equity |  | (3) | (3)
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  |  |
Other | [1] |  |
Investments, ending |  | 1,934 | 1,937
Joint ventures [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investments, beginning |  | 2,993,497 | 2,688,636
Equity |  | 452,562 | 341,147
Investment/advance for future capital increase |  | 4,829 | 30,970
Capital decrease |  | (61,536) |
Amortization |  | (367) | (367)
Dividends and JSCP |  | (110,882) | (66,889)
Other | [1] |  |
Investments, ending |  | 3,278,103 | 2,993,497
Joint ventures [member] | Voltalia Sao Miguel Do Gostoso I [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investments, beginning |  | 108,990 | 107,721
Equity |  | 2,157 | 1,269
Investment/advance for future capital increase |  | 4,829 |
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  |  |
Other | [1] |  |
Investments, ending |  | 115,976 | 108,990
Joint ventures [member] | Voltalia Sao Miguel Do Gostoso Direito De Autorizacao [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investments, beginning |  | 9,304 | 9,671
Equity |  |  |
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  | (367) | (367)
Dividends and JSCP |  |  |
Other | [1] |  |
Investments, ending |  | 8,937 | 9,304
Joint ventures [member] | Caiua [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investments, beginning |  | 106,977 | 95,362
Equity |  | 23,806 | 13,765
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  | (5,486) | (2,150)
Other | [1] |  |
Investments, ending |  | 125,297 | 106,977
Joint ventures [member] | Integracao Maranhense [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investments, beginning |  | 166,563 | 148,581
Equity |  | 32,824 | 20,255
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  | (6,885) | (2,273)
Other | [1] |  |
Investments, ending |  | 192,502 | 166,563
Joint ventures [member] | Matrincha [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investments, beginning |  | 811,771 | 734,503
Equity |  | 162,298 | 96,614
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  | (42,541) | (19,346)
Other | [1] |  |
Investments, ending |  | 931,528 | 811,771
Joint ventures [member] | Guaraciaba [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investments, beginning |  | 407,615 | 361,170
Equity |  | 82,251 | 57,363
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  | (22,767) | (10,918)
Other | [1] |  |
Investments, ending |  | 467,099 | 407,615
Joint ventures [member] | Paranaiba [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investments, beginning |  | 226,923 | 203,681
Equity |  | 47,623 | 35,112
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  | (10,567) | (11,870)
Other | [1] |  |
Investments, ending |  | 263,979 | 226,923
Joint ventures [member] | Mata De Santa Genebra [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investments, beginning |  | 710,989 | 661,430
Equity |  | 56,140 | 63,173
Investment/advance for future capital increase |  |  |
Capital decrease |  | (61,536) |
Amortization |  |  |
Dividends and JSCP |  | (13,333) | (13,614)
Other | [1] |  |
Investments, ending |  | 692,260 | 710,989
Joint ventures [member] | Cantareira [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investments, beginning |  | 437,330 | 359,686
Equity |  | 45,293 | 53,492
Investment/advance for future capital increase |  |  | 30,870
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  | (9,254) | (6,718)
Other | [1] |  |
Investments, ending |  | 473,369 | 437,330
Joint ventures [member] | Solar Parana [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investments, beginning |  | 7,035 | 6,831
Equity |  | 170 | 104
Investment/advance for future capital increase |  |  | 100
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  | (49) |
Other | [1] |  |
Investments, ending |  | R$ 7,156 | R$ 7,035
[1] | Transfer of assets destined for disposal.

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