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16 Investments (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  | R$ 2,523,179 | R$ 2,368,234
Equity |  | 193,547 | 106,757
Investment/advance for future capital increase |  | 72,439 | 267,471
Capital decrease |  | (228) | (35,035)
Amortization |  | 372 | (372)
Dividends and JSCP |  | (50,926) | (49,613)
Transfers |  |  | (134,263)
Other | [1] | (8,122) |
Investments, ending |  | 2,729,517 | 2,523,179
Associates [Member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  | 50,999 | 48,928
Equity |  | 19,192 | 24,414
Investment/advance for future capital increase |  |  | 123
Capital decrease |  | (228) | (735)
Amortization |  |  |
Dividends and JSCP |  | (21,768) | (21,731)
Transfers |  |  |
Other | [1] | (8,122) |
Investments, ending |  | 40,073 | 50,999
Investment Property [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  | 813 | 1,342
Equity |  |  |
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  | (5) | (5)
Dividends and JSCP |  |  |
Transfers |  |  | (524)
Other | [1] |  |
Investments, ending |  | 808 | 813
Advance for Future Capital Future Capital Increase [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  |  |
Equity |  |  | 142
Investment/advance for future capital increase |  |  |
Capital decrease |  |  | 133,597
Amortization |  |  |
Dividends and JSCP |  |  |
Transfers |  |  | (133,739)
Investments, ending |  |  |
Dona Francisca Energetica [member] | Associates [Member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  | 28,423 | 29,144
Equity |  | 9,674 | 9,853
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  | (9,950) | (10,574)
Transfers |  |  |
Other | [1] |  |
Investments, ending |  | 28,147 | 28,423
Foz Do Chopim Energetica [member] | Associates [Member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  | 12,175 | 8,227
Equity |  | 9,629 | 13,924
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  | (11,818) | (9,976)
Transfers |  |  |
Other | [1] |  |
Investments, ending |  | 9,986 | 12,175
Domino Holdings [member] | Associates [Member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  | 246 | 2,442
Equity |  | (93) | (280)
Investment/advance for future capital increase |  |  |
Capital decrease |  |  | (735)
Amortization |  |  |
Dividends and JSCP |  |  | (1,181)
Transfers |  |  |
Other | [1] | (153) |
Investments, ending |  |  | 246
Others [member] | Associates [Member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  | 10,155 | 9,115
Equity |  | (18) | 917
Investment/advance for future capital increase |  |  | 123
Capital decrease |  | (228) |
Amortization |  |  |
Dividends and JSCP |  |  |
Transfers |  |  |
Other | [1] | (7,969) |
Investments, ending |  | 1,940 | 10,155
Joint Ventures [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  | 2,471,367 | 2,317,822
Equity |  | 174,355 | 82,343
Investment/advance for future capital increase |  | 72,439 | 133,751
Capital decrease |  |  | (34,300)
Amortization |  | (367) | (367)
Dividends and JSCP |  | (29,158) | (27,882)
Transfers |  |  |
Other | [1] |  |
Investments, ending |  | 2,688,636 | 2,471,367
Joint Ventures [member] | Voltalia Sao Miguel Do Gostoso I [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  | 110,099 | 110,568
Equity |  | (2,378) | (3,409)
Investment/advance for future capital increase |  |  | 2,940
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  |  |
Transfers |  |  |
Other | [1] |  |
Investments, ending |  | 107,721 | 110,099
Joint Ventures [member] | Voltalia Sao Miguel Do Gostoso - Authorization Rights [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  | 10,038 | 10,405
Equity |  |  |
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  | (367) | (367)
Dividends and JSCP |  |  |
Transfers |  |  |
Other | [1] |  |
Investments, ending |  | 9,671 | 10,038
Joint Ventures [member] | Caiua [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  | 78,312 | 74,639
Equity |  | (8,964) | 4,800
Investment/advance for future capital increase |  | 26,014 |
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  |  | (1,127)
Transfers |  |  |
Other | [1] |  |
Investments, ending |  | 95,362 | 78,312
Joint Ventures [member] | Integracao maranhense [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  | 138,716 | 129,684
Equity |  | 13,672 | 11,316
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  | (3,807) | (2,284)
Transfers |  |  |
Other | [1] |  |
Investments, ending |  | 148,581 | 138,716
Joint Ventures [member] | Matrincha [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  | 711,527 | 673,216
Equity |  | 25,644 | 48,634
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  | (2,668) | (10,323)
Transfers |  |  |
Other | [1] |  |
Investments, ending |  | 734,503 | 711,527
Joint Ventures [member] | Guaraciaba [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  | 337,077 | 356,941
Equity |  | 25,528 | 18,312
Investment/advance for future capital increase |  |  |
Capital decrease |  |  | (34,300)
Amortization |  |  |
Dividends and JSCP |  | (1,435) | (3,876)
Transfers |  |  |
Other | [1] |  |
Investments, ending |  | 361,170 | 337,077
Joint Ventures [member] | Paranaiba [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  | 173,973 | 160,584
Equity |  | 29,708 | 16,375
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  |  | (2,986)
Transfers |  |  |
Other | [1] |  |
Investments, ending |  | 203,681 | 173,973
Joint Ventures [member] | Mata de santa genebra [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  | 573,357 | 484,262
Equity |  | 48,594 | (41,716)
Investment/advance for future capital increase |  | 39,479 | 130,811
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  |  |
Transfers |  |  |
Other | [1] |  |
Investments, ending |  | 661,430 | 573,357
Joint Ventures [member] | Cantareira [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  | 338,268 | 317,523
Equity |  | 42,666 | 28,031
Investment/advance for future capital increase |  |  |
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  | (21,248) | (7,286)
Transfers |  |  |
Other | [1] |  |
Investments, ending |  | 359,686 | 338,268
Joint Ventures [member] | Solar Parana [member] |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Investments, beginning |  |  |
Equity |  | (115) |
Investment/advance for future capital increase |  | 6,946 |
Capital decrease |  |  |
Amortization |  |  |
Dividends and JSCP |  |  |
Other | [1] |  |
Investments, ending |  | R$ 6,831 |
[1] | R$ 7,969 of Impairment of Estacao Osasco Desenvolvimento Imobiliario SA, an associate of UEG Araucaria, and R$ 153 of liquidation of Domino.

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