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Financial Instruments (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
IfrsStatementLineItems [Line Items] |  |
Total financial assets, book value | R$ 13,984,091 | R$ 10,338,902
Total financial assets, fair value | 14,084,625 | 10,438,723
Total financial liabilities, book value | 20,715,722 | 19,404,557
Total financial liabilities, fair value | 20,492,093 | 18,727,925
Financial liabilities at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial liabilities, book value | 19,962,138 | 18,665,854
Total financial liabilities, fair value | 19,738,509 | 17,989,222
Financial liabilities at fair value through profit or loss, category [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial liabilities, book value | 753,584 | 738,703
Total financial liabilities, fair value | 753,584 | 738,703
Sectorial Financial Liabilities [Member] | Financial liabilities at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial liabilities, book value | 503,991 | 483,255
Total financial liabilities, fair value | 503,991 | 483,255
ICMS Installment Payment [member] | Financial liabilities at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial liabilities, book value | 41,286 | 48,320
Total financial liabilities, fair value | 37,777 | 43,419
Special Tax Regularization Program Pert [Member] | Financial liabilities at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial liabilities, book value | 379,724 | 404,075
Total financial liabilities, fair value | 322,711 | 340,025
PIS And Cofins To Be Refunded To Consumers [member] | Financial liabilities at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial liabilities, book value | 731,726 | 1,995,158
Total financial liabilities, fair value | 731,726 | 1,995,158
Accounts Payable To Suppliers [Member] | Financial liabilities at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial liabilities, book value | 2,285,573 | 2,215,470
Total financial liabilities, fair value | 2,285,573 | 2,215,470
Loans And Financing [Member] | Financial liabilities at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial liabilities, book value | 5,387,977 | 4,694,957
Total financial liabilities, fair value | 5,138,930 | 4,171,789
Debentures [Member] | Financial liabilities at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial liabilities, book value | 9,738,006 | 7,887,077
Total financial liabilities, fair value | 9,699,171 | 7,688,396
Accounts Payable Related To Concession [Member] | Financial liabilities at amortised cost, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial liabilities, book value | 893,855 | 937,542
Total financial liabilities, fair value | 1,018,630 | 1,051,710
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] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial liabilities, book value | 753,584 | 738,703
Total financial liabilities, fair value | 753,584 | 738,703
Financial assets at fair value through profit or loss, category [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial assets, book value | 9,290,044 | 5,728,351
Total financial assets, fair value | 9,290,044 | 5,728,351
Financial assets at fair value through profit or loss, category [member] | Cash And Cash Equivalents Financial Asset [Member] | Level 1 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial assets, book value | 5,634,623 | 2,678,457
Total financial assets, fair value | 5,634,623 | 2,678,457
Financial assets at fair value through profit or loss, category [member] | Bonds And Securities One [Member] | Level 1 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial assets, book value | 495,495 | 431,056
Total financial assets, fair value | 495,495 | 431,056
Financial assets at fair value through profit or loss, category [member] | Accounts Receivable Related To The Distribution Concession [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial assets, book value | 1,954,679 | 1,442,819
Total financial assets, fair value | 1,954,679 | 1,442,819
Financial assets at fair value through profit or loss, category [member] | Accounts Receivable Related To The Generation Concession [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial assets, book value | 71,835 | 68,642
Total financial assets, fair value | 71,835 | 68,642
Financial assets at fair value through profit or loss, category [member] | Fair Value In The Purchase And Sale Of Power In The Active Market [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial assets, book value | 1,101,684 | 1,081,758
Total financial assets, fair value | 1,101,684 | 1,081,758
Financial assets at fair value through profit or loss, category [member] | Other Temporary Investments One [Member] | Level 1 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial assets, book value | 17,864 | 15,372
Total financial assets, fair value | 17,864 | 15,372
Financial assets at fair value through profit or loss, category [member] | Other Temporary Investments Two [Member] | Level 2 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial assets, book value | 13,864 | 10,247
Total financial assets, fair value | 13,864 | 10,247
Financial assets at amortised cost, category [member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial assets, book value | 4,690,125 | 4,600,256
Total financial assets, fair value | 4,790,659 | 4,700,077
Financial assets at amortised cost, category [member] | Collaterals And Escrow Accounts [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial assets, book value | 9 | 157
Total financial assets, fair value | 9 | 157
Financial assets at amortised cost, category [member] | Trade Accounts Receivable Financial Assets [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial assets, book value | 3,866,429 | 3,451,869
Total financial assets, fair value | 3,866,429 | 3,451,869
Financial assets at amortised cost, category [member] | Sectorial Financial Assets [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial assets, book value | 30,946 | 381,398
Total financial assets, fair value | 30,946 | 381,398
Financial assets at amortised cost, category [member] | Accounts Receivable Related To The Concession Bonus From The Grant [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial assets, book value | 792,741 | 766,832
Total financial assets, fair value | 893,275 | 866,653
Fair Value Through Other Comprehensive Income [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial assets, book value | 3,922 | 10,295
Total financial assets, fair value | 3,922 | 10,295
Fair Value Through Other Comprehensive Income [Member] | Certified Emission Reductions [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Total financial assets, book value | 3,922 | 10,295
Total financial assets, fair value | R$ 3,922 | R$ 10,295

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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 2023-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_25&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35H&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35M&doctype=Standard -URIDate 2023-03-23 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 35N -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35N&doctype=Standard -URIDate 2023-03-23 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35I&doctype=Standard -URIDate 2023-03-23 + Details
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