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35 Financial Instruments (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, book value |  | R$ 11,853,814 | R$ 10,696,367 |
Total financial assets, fair value |  | 12,029,028 |  |
Total financial liabilities, book value |  | 18,139,625 | 15,065,586 |
Total financial liabilities, fair value |  | 17,879,609 |  |
Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, fair value |  |  | 10,920,875 |
Total financial liabilities, fair value |  |  | 15,026,969 |
Financial Liabilities at Amortised Cost [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, book value |  | 17,796,219 | 14,812,410 |
Total financial liabilities, fair value |  | 17,536,203 |  |
Financial Liabilities at Amortised Cost [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, fair value |  |  | 14,773,793 |
Financial liabilities at fair value through profit or loss, category [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, book value |  | 343,406 | 253,176 |
Total financial liabilities, fair value |  | 343,406 |  |
Financial liabilities at fair value through profit or loss, category [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, fair value |  |  | 253,176 |
Sectorial financial liabilities [member] | Financial Liabilities at Amortised Cost [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, book value | [1] | 188,709 | 102,284 |
Total financial liabilities, fair value | [1] | 188,709 |  |
Sectorial financial liabilities [member] | Financial Liabilities at Amortised Cost [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, fair value |  |  | 102,284 |
Ordinary Financing of Taxes With The Federal Tax Authorities [member] | Financial Liabilities at Amortised Cost [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, book value |  |  | 18,063 |
Total financial liabilities, fair value |  |  |  |
Ordinary Financing of Taxes With The Federal Tax Authorities [member] | Financial Liabilities at Amortised Cost [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, fair value |  |  | 18,001 |
Special Tax Regularization Program - Pert [member] | Financial Liabilities at Amortised Cost [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, book value | [2] | 459,303 | 497,207 |
Total financial liabilities, fair value | [2] | 377,375 |  |
Special Tax Regularization Program - Pert [member] | Financial Liabilities at Amortised Cost [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, fair value |  |  | 439,519 |
PIS and Cofins to be refunded to consumers [member] | Financial Liabilities at Amortised Cost [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, book value |  | 3,927,823 |  |
Total financial liabilities, fair value |  | 3,927,823 |  |
PIS and Cofins to be refunded to consumers [member] | Financial Liabilities at Amortised Cost [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, fair value |  |  |  |
Accounts payable to suppliers [member] | Financial Liabilities at Amortised Cost [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, book value |  | 2,436,452 | 1,873,193 |
Total financial liabilities, fair value |  | 2,436,452 |  |
Accounts payable to suppliers [member] | Financial Liabilities at Amortised Cost [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, fair value |  |  | 1,873,193 |
Loans and Financing [member] | Financial Liabilities at Amortised Cost [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, book value | [2] | 3,214,249 | 3,168,710 |
Total financial liabilities, fair value | [2] | 2,956,696 |  |
Loans and Financing [member] | Financial Liabilities at Amortised Cost [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, fair value |  |  | 3,110,104 |
Debentures [member] | Financial Liabilities at Amortised Cost [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, book value | [3] | 6,837,819 | 8,540,366 |
Total financial liabilities, fair value | [3] | 6,837,819 |  |
Debentures [member] | Financial Liabilities at Amortised Cost [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, fair value |  |  | 8,540,366 |
Accounts payable related to concession [member] | Financial Liabilities at Amortised Cost [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, book value | [4] | 731,864 | 811,329 |
Total financial liabilities, fair value | [4] | 811,329 |  |
Accounts payable related to concession [member] | Financial Liabilities at Amortised Cost [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, fair value |  |  | 690,326 |
Derivatives fair value - forward contracts [member] | Level 3 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, book value | [5] |  | 1,203 |
Total financial liabilities, fair value | [5] |  |  |
Derivatives fair value - forward contracts [member] | Level 3 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, fair value |  |  | 1,203 |
Fair value in the purchase and sale of power [member] | Level 3 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, book value | [5] | 343,406 | 251,973 |
Total financial liabilities, fair value | [5] | 343,406 |  |
Fair value in the purchase and sale of power [member] | Level 3 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial liabilities, fair value | [5] |  | 251,973 |
Fair value through profit or loss [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, book value |  | 5,489,658 | 4,942,562 |
Total financial assets, fair value |  | 5,489,658 |  |
Fair value through profit or loss [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, fair value |  |  | 4,942,562 |
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] | 3,222,768 | 2,941,727 |
Total financial assets, fair value |  | 3,222,768 |  |
Fair value through profit or loss [member] | Cash and cash equivalents [member] | Level 1 of fair value hierarchy [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, fair value |  |  | 2,941,727 |
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] | 751 | 2,429 |
Total financial assets, fair value | [6] | 751 |  |
Fair value through profit or loss [member] | Bonds and securities [member] | Level 1 of fair value hierarchy [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, fair value |  |  | 2,429 |
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] | 299,779 | 279,652 |
Total financial assets, fair value | [6] | 299,779 |  |
Fair value through profit or loss [member] | Bonds and securities [member] | Level 2 of fair value hierarchy [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, fair value |  |  | 279,652 |
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] | 1,149,934 | 1,161,203 |
Total financial assets, fair value | [7] | 1,149,934 |  |
Fair value through profit or loss [member] | Accounts receivable related to the distribution concession [member] | Level 3 of fair value hierarchy [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, fair value |  |  | 1,161,203 |
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] | 81,202 | 69,182 |
Total financial assets, fair value | [8] | 81,202 |  |
Fair value through profit or loss [member] | Accounts receivable related to the generation concession [member] | Level 3 of fair value hierarchy [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, fair value |  |  | 69,182 |
Fair value through profit or loss [member] | Derivatives fair value - forward contracts [member] | Level 3 of fair value hierarchy [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, book value | [5] | 23,308 |  |
Total financial assets, fair value | [5] | 23,308 |  |
Fair value through profit or loss [member] | Derivatives fair value - forward contracts [member] | Level 3 of fair value hierarchy [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, fair value |  |  | 1,203 |
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 | [5] | 689,531 | 460,635 |
Total financial assets, fair value | [5] | 689,531 |  |
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] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, fair value |  |  | 460,635 |
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 | [9] | 14,910 | 15,566 |
Total financial assets, fair value | [9] | 14,910 |  |
Fair value through profit or loss [member] | Other temporary investments [member] | Level 1 of fair value hierarchy [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, fair value |  |  | 15,566 |
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 | [9] | 7,475 | 12,168 |
Total financial assets, fair value | [9] | 7,475 |  |
Fair value through profit or loss [member] | Other Temporary Investments [member] | Level 2 of fair value hierarchy [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, fair value |  |  | 12,168 |
Financial Assets at Amortised Cost [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, book value |  | 6,364,156 | 5,753,805 |
Total financial assets, fair value |  | 6,539,370 |  |
Financial Assets at Amortised Cost [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, fair value |  |  | 5,978,313 |
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] | 197 | 147 |
Total financial assets, fair value | [1] | 197 |  |
Financial Assets at Amortised Cost [member] | Collaterals And Escrow Accounts [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, fair value |  |  | 147 |
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 |  | 133,521 | 98,433 | [2]
Total financial assets, fair value |  | 113,477 |  |
Financial Assets at Amortised Cost [member] | Collaterals And Escrow Accounts [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, fair value |  |  | 94,671 |
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] | 3,819,680 | 3,182,567 |
Total financial assets, fair value | [1] | 3,819,680 |  |
Financial Assets at Amortised Cost [member] | Trade accounts receivable [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, fair value |  |  | 3,182,567 |
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 | [10] | 1,392,624 | 1,350,685 |
Total financial assets, fair value | [10] | 1,496,016 |  |
Financial Assets at Amortised Cost [member] | CRC transferred to the parana state government [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, fair value |  |  | 1,488,456 |
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] | 346,930 | 473,989 |
Total financial assets, fair value | [1] | 346,930 |  |
Financial Assets at Amortised Cost [member] | Sectorial financial assets [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, fair value |  |  | 473,989 |
Financial Assets at Amortised Cost [member] | Accounts receivable - concessions - bonus from the grant [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, book value | [11] | 671,204 | 647,984 |
Total financial assets, fair value | [11] | R$ 763,070 |  |
Financial Assets at Amortised Cost [member] | Accounts receivable - concessions - bonus from the grant [member] | Restated [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Total financial assets, fair value |  |  | R$ 738,483 |
[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 IPCA + Spread de 4.8165%, for discount of the expected payment flows.
[3] | Calculated from the Unit Price quotation (PU) for December 31, 2020, obtained from the Brazilian Association of Financial and Capital Markets (ANBIMA), net of unamortized financial cost.
[4] | Actual net discount rate of 8.64% p.a., in line with the Company's estimated rate for long-term projects.
[5] | The fair values of assets and liabilities are equivalent to their carrying amounts according to Note 4.15 of these Financial Statements.
[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] | 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.
[10] | 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 3.09% p.a. plus the IPCA inflation index.
[11] | 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 2020-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_25&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35H&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35I&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35M&doctype=Standard -URIDate 2020-01-01 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35N&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_25&doctype=Standard -URIDate 2020-01-01 + Details
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