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35 Financial Instruments (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value |  | R$ 11,435,636 | R$ 10,198,325
Total financial assets, fair value |  | 11,659,433 | 10,375,829
Total financial liabilities, book value |  | 15,162,190 | 14,331,412
Total financial liabilities, fair value |  | 15,229,002 | 14,349,047
Financial Liabilities at Amortised Cost [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial liabilities, book value |  | 14,909,014 | 14,320,405
Total financial liabilities, fair value |  | 14,975,826 | 14,338,040
Financial Liabilities at Amortised Cost [Member] | Sectorial Financial Liabilities [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial liabilities, book value | [1] | 102,284 | 96,531
Total financial liabilities, fair value | [1] | 102,284 | 96,531
Financial Liabilities at Amortised Cost [Member] | Ordinary Financing of Taxes With The Federal Tax Authorities [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial liabilities, book value |  | 18,063 | 86,632
Total financial liabilities, fair value |  | 18,001 | 84,383
Financial Liabilities at Amortised Cost [Member] | Special Tax Regularization Program - Pert [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial liabilities, book value | [2] | 497,207 | 518,442
Total financial liabilities, fair value | [2] | 446,448 | 469,304
Financial Liabilities at Amortised Cost [Member] | Suppliers [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial liabilities, book value |  | 1,873,193 | 1,469,199
Total financial liabilities, fair value |  | 1,873,193 | 1,469,199
Financial Liabilities at Amortised Cost [Member] | Loans and Financing [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial liabilities, book value | [2] | 3,168,710 | 4,047,307
Total financial liabilities, fair value | [2] | 3,204,188 | 4,012,621
Financial Liabilities at Amortised Cost [Member] | Debentures [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial liabilities, book value | [3] | 8,540,366 | 7,518,131
Total financial liabilities, fair value | [3] | 8,540,366 | 7,518,133
Financial Liabilities at Amortised Cost [Member] | Payable Related To Concession [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial liabilities, book value | [4] | 612,587 | 584,163
Total financial liabilities, fair value | [4] | 694,742 | 687,869
Financial Liabilities at Amortised Cost [Member] | Fair Value In the Purchase and Sale of Power [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial liabilities, book value | [5] | 251,973 | 11,007
Total financial liabilities, fair value | [5] | 251,973 | 11,007
Financial Liabilities at Amortised Cost [Member] | Derivatives Fair Value - Forward Contracts [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial liabilities, book value |  | 1,203 |
Total financial liabilities, fair value |  | 1,203 |
Financial Liabilities at Amortised Cost [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial liabilities, book value |  | 253,176 | 11,007
Total financial liabilities, fair value |  | 253,176 | 11,007
Fair Value Through Profit Or Loss [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value |  | 4,942,562 | 3,498,102
Total financial assets, fair value |  | 4,942,562 | 3,498,102
Fair Value Through Profit Or Loss [Member] | Cash And Cash Equivalents [Member] | Level 1 of Fair Value Hierarchy [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value | [1] | 2,941,727 | 1,948,409
Total financial assets, fair value |  | 2,941,727 | 1,948,409
Fair Value Through Profit Or Loss [Member] | Bonds And Securities [Member] | Level 1 of Fair Value Hierarchy [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value | [6] | 2,429 | 696
Total financial assets, fair value | [6] | 2,429 | 696
Fair Value Through Profit Or Loss [Member] | Bonds And Securities [Member] | Level 2 of Fair Value Hierarchy [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value | [6] | 279,652 | 343,600
Total financial assets, fair value | [6] | 279,652 | 343,600
Fair Value Through Profit Or Loss [Member] | Accounts Receivable Related To The Distribution Concession [Member] | Level 3 of Fair Value Hierarchy [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value | [7] | 1,161,203 | 1,105,282
Total financial assets, fair value | [7] | 1,161,203 | 1,105,282
Fair Value Through Profit Or Loss [Member] | Accounts Receivable Related To The Generation Concession [Member] | Level 1 of Fair Value Hierarchy [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value | [8] |  | 65,811
Total financial assets, fair value | [8] |  | 65,811
Fair Value Through Profit Or Loss [Member] | Accounts Receivable Related To The Generation Concession [Member] | Level 3 of Fair Value Hierarchy [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value | [8] | 69,182 |
Total financial assets, fair value | [8] | 69,182 |
Fair Value Through Profit Or Loss [Member] | Fair Value In The Purchase And Sale Of Power In The Active Market [Member] | Level 3 of Fair Value Hierarchy [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value | [9] | 460,635 | 14,793
Total financial assets, fair value | [9] | 460,635 | 14,793
Fair Value Through Profit Or Loss [Member] | Other Temporary Investments [Member] | Level 1 of Fair Value Hierarchy [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value | [10] | 15,566 | 11,557
Total financial assets, fair value | [10] | 15,566 | 11,557
Fair Value Through Profit Or Loss [Member] | Other Temporary Investments [Member] | Level 2 of Fair Value Hierarchy [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value | [10] | 12,168 | 7,954
Total financial assets, fair value | [10] | 12,168 | 7,954
Financial Assets at Amortised Cost [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value |  | 6,493,074 | 6,700,223
Total financial assets, fair value |  | 6,716,871 | 6,877,727
Financial Assets at Amortised Cost [Member] | Collaterals And Escrow Accounts [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value | [1] | 147 | 203
Total financial assets, fair value | [1] | 147 | 203
Financial Assets at Amortised Cost [Member] | Collaterals And Escrow Accounts [Member] | Level 2 of Fair Value Hierarchy [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value | [2] |  | 89,555
Total financial assets, fair value | [2] |  | 76,524
Financial Assets at Amortised Cost [Member] | Collaterals And Escrow Accounts [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value | [2] | 98,433 |
Total financial assets, fair value | [2] | 102,733 |
Financial Assets at Amortised Cost [Member] | Trade Accounts Receivable [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value | [1] | 3,182,567 | 3,107,006
Total financial assets, fair value | [1] | 3,182,567 | 3,107,006
Financial Assets at Amortised Cost [Member] | CRC Transferred To The Parana State Government [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value | [11] | 1,350,685 | 1,445,042
Total financial assets, fair value | [11] | 1,479,683 | 1,546,469
Financial Assets at Amortised Cost [Member] | Sectorial Financial Assets [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value | [1] | 473,989 | 678,819
Total financial assets, fair value | [1] | 473,989 | 678,819
Financial Assets at Amortised Cost [Member] | Accounts Receivable Related To The Concession - RBSE [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value | [7] | 739,269 |
Total financial assets, fair value | [7] | 739,269 |
Financial Assets at Amortised Cost [Member] | Accounts Receivable Related To The Concession - RBSE [Member] | Level 1 of Fair Value Hierarchy [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value | [7] |  | 753,826
Total financial assets, fair value | [7] |  | 753,826
Financial Assets at Amortised Cost [Member] | Accounts Receivable Related To The Concession - Bonus From The Grant [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total financial assets, book value | [12] | 647,984 | 625,772
Total financial assets, fair value | [12] | R$ 738,483 | R$ 714,880
[1] | Equivalent to their respective carrying values due to their nature and terms of realization.
[2] | The cost of the last borrowing taken out by the Company is used as a basic assumption 120.0% of CDI, for discount of the expected payment flows.
[3] | Calculated from the Unit Price quotation (PU) for December 31, 2019, obtained from the Brazilian Association of Financial and Capital Markets (ANBIMA), net of unamortized financial cost.
[4] | Actual net discount rate of 8.26% p.a., in line with the Company's estimated rate for long-term projects.
[5] | Buildings under construction.
[6] | Fair value is calculated based on information made available by the financial agents and the market values of the bonds issued by the Brazilian government.
[7] | The criteria are disclosed in Note 4.4 to the financial statements.
[8] | The fair values of generation assets approximate their carrying amounts, according to Note 4.4 of these Financial Statements.
[9] | The fair values of assets and liabilities are equivalent to their carrying amounts according to Note 4.15 of these Financial Statements.
[10] | Investments in other companies, stated at fair value, which is calculated according to the price quotations published in an active market, for assets classified as level 1 and determined in view of the comparative assessment model for assets classified as level 2.
[11] | The Company based its calculation on the comparison with a long-term and post-fixed National Treasury Bond (NTN-B) maturing on August 15, 2026, which yields approximately 2.74% p.a. plus the IPCA inflation index.
[12] | Receivables related to the concession agreement for providing electricity generation services under quota arrangements, having their fair value calculated by expected cash inflows, discounted at the rate established by ANEEL auction notice 12/2015 (9.04%).

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35H&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35I&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35M&doctype=Standard -URIDate 2019-03-27 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35N&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard -URIDate 2019-03-27 + Details
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