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16 Investments (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  | R$ 2,368,234 | R$ 2,570,643 | [1]
Equity |  | 106,757 | 135,888 |
Investment/advance for future capital increase |  | 267,471 | 87,781 |
Capital decrease |  | (35,035) | (35,280) |
Amortization |  | (372) | (373) |
Proposed dividends and JCP |  | (49,613) | (46,715) |
Transfers |  | (134,263) |  |
Effects of applying new IFRS |  |  | (148,748) |
Other | [2] |  | (194,962) |
Investments, ending |  | 2,523,179 | 2,368,234 |
Associates [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  | 48,928 | 54,918 |
Equity |  | 24,414 | 23,165 |
Investment/advance for future capital increase |  | 123 | 9 |
Capital decrease |  | (735) |  |
Amortization |  |  |  |
Proposed dividends and JCP |  | (21,731) | (28,737) |
Transfers |  |  |  |
Effects of applying new IFRS |  |  |  |
Other | [2] |  | (427) |
Investments, ending |  | 50,999 | 48,928 |
Investment Property [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  | 1,342 | 1,362 |
Equity |  |  |  |
Investment/advance for future capital increase |  |  |  |
Capital decrease |  |  |  |
Amortization |  |  | (5) |
Proposed dividends and JCP |  |  |  |
Effects of applying new IFRS |  |  |  |
Other | [2] |  | (15) |
Investments, ending |  |  | 1,342 |
Other investments [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  | 1,342 | 1,362 |
Equity |  |  |  |
Investment/advance for future capital increase |  |  | 142 |
Capital decrease |  |  |  |
Amortization |  | (5) |  |
Proposed dividends and JCP |  |  |  |
Transfers |  | (524) |  |
Effects of applying new IFRS |  |  |  |
Other | [2] |  |  |
Investments, ending |  | 813 | 1,342 |
Advance for Future Capital Future Capital Increase [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  | 142 |  |
Equity |  | 133,597 |  |
Investment/advance for future capital increase |  |  |  |
Capital decrease |  |  |  |
Amortization |  |  |  |
Proposed dividends and JCP |  |  |  |
Transfers |  | (133,739) |  |
Investments, ending |  |  | 142 |
Dona Francisca Energetica [Member] | Associates [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  | 29,144 | 29,821 |
Equity |  | 9,853 | 9,989 |
Investment/advance for future capital increase |  |  |  |
Capital decrease |  |  |  |
Amortization |  |  |  |
Proposed dividends and JCP |  | (10,574) | (10,666) |
Transfers |  |  |  |
Effects of applying new IFRS |  |  |  |
Other | [2] |  |  |
Investments, ending |  | 28,423 | 29,144 |
Foz Do Chopim Energetica [Member] | Associates [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  | 8,227 | 13,084 |
Equity |  | 13,924 | 13,214 |
Investment/advance for future capital increase |  |  |  |
Capital decrease |  |  |  |
Amortization |  |  |  |
Proposed dividends and JCP |  | (9,976) | (18,071) |
Transfers |  |  |  |
Effects of applying new IFRS |  |  |  |
Other | [2] |  |  |
Investments, ending |  | 12,175 | 8,227 |
Domino Holdings [Member] | Associates [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  | 2,442 | 2,457 |
Equity |  | (280) | (15) |
Investment/advance for future capital increase |  |  |  |
Capital decrease |  | (735) |  |
Amortization |  |  |  |
Proposed dividends and JCP |  | (1,181) |  |
Transfers |  |  |  |
Effects of applying new IFRS |  |  |  |
Other | [2] |  |  |
Investments, ending |  | 246 | 2,442 |
Others [Member] | Associates [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  | 9,115 | 9,556 |
Equity |  | 917 | (23) |
Investment/advance for future capital increase |  | 123 | 9 |
Capital decrease |  |  |  |
Amortization |  |  |  |
Proposed dividends and JCP |  |  |  |
Transfers |  |  |  |
Effects of applying new IFRS |  |  |  |
Other | [2] |  | (427) |
Investments, ending |  | 10,155 | 9,115 |
Joint Ventures [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  | 2,317,822 | 2,514,363 |
Equity |  | 82,343 | 112,723 |
Investment/advance for future capital increase |  | 133,751 | 87,630 |
Capital decrease |  | (34,300) | (35,280) |
Amortization |  | (367) | (368) |
Proposed dividends and JCP |  | (27,882) | (17,978) |
Transfers |  |  |  |
Effects of applying new IFRS |  |  | (148,748) |
Other | [2] |  | (194,520) |
Investments, ending |  | 2,471,367 | 2,317,822 |
Joint Ventures [Member] | Voltalia Sao Miguel Do Gostoso I [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  | 110,568 | 74,998 |
Equity |  | (3,409) | (3,964) |
Investment/advance for future capital increase |  | 2,940 | 39,534 |
Capital decrease |  |  |  |
Amortization |  |  |  |
Proposed dividends and JCP |  |  |  |
Transfers |  |  |  |
Effects of applying new IFRS |  |  |  |
Other | [2] |  |  |
Investments, ending |  | 110,099 | 110,568 |
Joint Ventures [Member] | Voltalia Sao Miguel Do Gostoso - Authorization Rights [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  |  | 10,773 |
Equity |  |  |  |
Investment/advance for future capital increase |  |  |  |
Capital decrease |  |  |  |
Amortization |  |  | (368) |
Proposed dividends and JCP |  |  |  |
Effects of applying new IFRS |  |  |  |
Other | [2] |  |  |
Joint Ventures [Member] | Parana Gas [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  |  | 3 |
Equity |  |  | (3) |
Investment/advance for future capital increase |  |  |  |
Capital decrease |  |  |  |
Amortization |  |  |  |
Proposed dividends and JCP |  |  |  |
Effects of applying new IFRS |  |  |  |
Other | [2] |  |  |
Joint Ventures [Member] | Costa Oeste [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  |  | 33,646 |
Equity |  |  | 3,041 |
Investment/advance for future capital increase |  |  |  |
Capital decrease |  |  |  |
Amortization |  |  |  |
Proposed dividends and JCP |  |  |  |
Effects of applying new IFRS |  |  |  |
Other | [2] |  | (36,687) |
Joint Ventures [Member] | Marumbi [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  |  | 85,341 |
Equity |  |  | 6,971 |
Investment/advance for future capital increase |  |  |  |
Capital decrease |  |  |  |
Amortization |  |  |  |
Proposed dividends and JCP |  |  |  |
Effects of applying new IFRS |  |  |  |
Other | [2] |  | (92,312) |
Joint Ventures [Member] | Transmissora Sul Brasileira [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  |  | 64,360 |
Equity |  |  | 1,161 |
Investment/advance for future capital increase |  |  |  |
Capital decrease |  |  |  |
Amortization |  |  |  |
Proposed dividends and JCP |  |  |  |
Effects of applying new IFRS |  |  |  |
Other | [2] |  | (65,521) |
Joint Ventures [Member] | Caiua [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  | 74,639 | 56,037 |
Equity |  | 4,800 | 5,034 |
Investment/advance for future capital increase |  |  |  |
Capital decrease |  |  |  |
Amortization |  |  |  |
Proposed dividends and JCP |  | (1,127) | (1,324) |
Transfers |  |  |  |
Effects of applying new IFRS |  |  | 14,892 |
Other | [2] |  |  |
Investments, ending |  | 78,312 | 74,639 |
Joint Ventures [Member] | Integracao Maranhense [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  | 129,684 | 113,401 |
Equity |  | 11,316 | 9,238 |
Investment/advance for future capital increase |  |  |  |
Capital decrease |  |  |  |
Amortization |  |  |  |
Proposed dividends and JCP |  | (2,284) | (2,022) |
Transfers |  |  |  |
Effects of applying new IFRS |  |  | 9,067 |
Other | [2] |  |  |
Investments, ending |  | 138,716 | 129,684 |
Joint Ventures [Member] | Matrincha [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  | 673,216 | 835,819 |
Equity |  | 48,634 | 50,411 |
Investment/advance for future capital increase |  |  |  |
Capital decrease |  |  |  |
Amortization |  |  |  |
Proposed dividends and JCP |  | (10,323) | (9,131) |
Transfers |  |  |  |
Effects of applying new IFRS |  |  | (203,883) |
Other | [2] |  |  |
Investments, ending |  | 711,527 | 673,216 |
Joint Ventures [Member] | Guaraciaba [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  | 356,941 | 418,320 |
Equity |  | 18,312 | 35,321 |
Investment/advance for future capital increase |  |  |  |
Capital decrease |  | (34,300) |  |
Amortization |  |  |  |
Proposed dividends and JCP |  | (3,876) | (4,328) |
Transfers |  |  |  |
Effects of applying new IFRS |  |  | (92,372) |
Other | [2] |  |  |
Investments, ending |  | 337,077 | 356,941 |
Joint Ventures [Member] | Paranaiba [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  | 160,584 | 162,273 |
Equity |  | 16,375 | (16,510) |
Investment/advance for future capital increase |  |  |  |
Capital decrease |  |  |  |
Amortization |  |  |  |
Proposed dividends and JCP |  | (2,986) | (2,976) |
Transfers |  |  |  |
Effects of applying new IFRS |  |  | 17,797 |
Other | [2] |  |  |
Investments, ending |  | 173,973 | 160,584 |
Joint Ventures [Member] | Mata de Santa Genebra [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  | 484,262 | 459,374 |
Equity |  | (41,716) | (2,541) |
Investment/advance for future capital increase |  | 130,811 | 48,096 |
Capital decrease |  |  |  |
Amortization |  |  |  |
Proposed dividends and JCP |  |  | 3,264 |
Transfers |  |  |  |
Effects of applying new IFRS |  |  | (23,931) |
Other | [2] |  |  |
Investments, ending |  | 573,357 | 484,262 |
Joint Ventures [Member] | Cantareira [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  |  | 200,018 |
Equity |  |  | 24,564 |
Investment/advance for future capital increase |  |  |  |
Capital decrease |  |  | (35,280) |
Amortization |  |  |  |
Proposed dividends and JCP |  |  | (1,461) |
Effects of applying new IFRS |  |  | 129,682 |
Other | [2] |  |  |
Joint Ventures [Member] | Voltalia Sao Miguel Do Gostoso - Direito De Autorizacao [Member] |  |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |  |
Investments, beginning |  | 10,405 |  |
Equity |  |  |  |
Investment/advance for future capital increase |  |  |  |
Capital decrease |  |  |  |
Amortization |  | (367) |  |
Proposed dividends and JCP |  |  |  |
Transfers |  |  |  |
Investments, ending |  | R$ 10,038 | R$ 10,405 |
[1] | As of December 31, 2017, the joint ventures operating in the transmission segment had their electricity transmission concession agreements classified as financial assets within the scope of IAS 39 and IFRIC 12. With the entry into force on January 1, 2018 of IFRS 15, bringing the concept of the right to receive the infrastructure investments conditioned to the fulfillment of performance obligations to operate and maintain the infrastructure and not only by the passage of time, the electricity transmission concession agreements started being classified as contract assets. As a result, the balance of the financial assets of the joint ventures started being classified on January 1, 2018 as contract assets in accordance with the Company's practices, with a reduction in its measurement in the amount of R$148,748 with effect in the Company in the caption Investments, by equity. At the transition, the Company and its joint ventures opted to adopt the standard on the date of initial application as an adjustment to the opening balance, in equity account, considering only agreements outstanding prior to the date of application, as set forth in IFRS 15.
[2] | Of the total, the amounts of R$ 36,687 and R$ 92,312 refers to investments that are now subsidiaries; R$ 65,521 refers to investment written off; R$ 427 from the sale of the associated company Dois Saltos Empreendimentos de Gerao de Energia Eltrica Ltda ; and R$ 15 refers to the transfer to Other receivables.

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