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Financial Instruments (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of financial assets [line items] |  |
Assets book value | R$ 13,009,596 | R$ 13,984,091
Assets fair value | 13,110,876 | 14,084,625
Liabilities book value | 23,349,153 | 20,715,722
Liabilities fair value | 23,154,410 | 20,492,093
Financial liabilities at fair value through profit or loss, category [Member] |  |
Disclosure of financial assets [line items] |  |
Liabilities book value | 385,792 | 753,584
Liabilities fair value | 385,792 | 753,584
Financial liabilities at amortised cost, class [Member] |  |
Disclosure of financial assets [line items] |  |
Liabilities book value | 22,963,361 | 19,962,138
Liabilities fair value | 22,768,618 | 19,738,509
Financial liabilities at amortised cost, class [Member] | Sectorial Financial Liabilities [Member] |  |
Disclosure of financial assets [line items] |  |
Liabilities book value | 1,077,810 | 503,991
Liabilities fair value | 1,077,810 | 503,991
Financial liabilities at amortised cost, class [Member] | ICMS Installment Payment |  |
Disclosure of financial assets [line items] |  |
Liabilities book value | 11,963 | 41,286
Liabilities fair value | 11,105 | 37,777
Financial liabilities at amortised cost, class [Member] | Special Tax Regularization Program – Pert |  |
Disclosure of financial assets [line items] |  |
Liabilities book value | 339,831 | 379,724
Liabilities fair value | 297,583 | 322,711
Financial liabilities at amortised cost, class [Member] | PIS And Cofins To Be Refunded To Consumers [Member] |  |
Disclosure of financial assets [line items] |  |
Liabilities book value | 0 | 731,726
Liabilities fair value | 0 | 731,726
Financial liabilities at amortised cost, class [Member] | Accounts Payable To Suppliers [Member] |  |
Disclosure of financial assets [line items] |  |
Liabilities book value | 2,466,803 | 2,285,573
Liabilities fair value | 2,466,803 | 2,285,573
Financial liabilities at amortised cost, class [Member] | Loans And Financing [Member] |  |
Disclosure of financial assets [line items] |  |
Liabilities book value | 5,154,871 | 5,387,977
Liabilities fair value | 5,128,374 | 5,138,930
Financial liabilities at amortised cost, class [Member] | Debentures [Member] |  |
Disclosure of financial assets [line items] |  |
Liabilities book value | 12,773,954 | 9,738,006
Liabilities fair value | 12,528,379 | 9,699,171
Financial liabilities at amortised cost, class [Member] | Accounts Payable Related To Concession [Member] |  |
Disclosure of financial assets [line items] |  |
Liabilities book value | 1,138,129 | 893,855
Liabilities fair value | 1,258,564 | 1,018,630
Level 3 of fair value hierarchy [Member] | Financial liabilities at fair value through profit or loss, category [Member] | Fair Value In The Purchase And Sale Of Power [Member] |  |
Disclosure of financial assets [line items] |  |
Liabilities book value | 385,792 | 753,584
Liabilities fair value | 385,792 | 753,584
Financial assets at fair value through profit or loss, category [Member] |  |
Disclosure of financial assets [line items] |  |
Assets book value | 8,090,985 | 9,290,044
Assets fair value | 8,090,985 | 9,290,044
Financial assets at fair value through profit or loss, category [Member] | Cash And Cash Equivalents Financial Asset [Member] | Level 2 of fair value hierarchy [Member] |  |
Disclosure of financial assets [line items] |  |
Assets book value | 4,161,939 | 5,634,623
Assets fair value | 4,161,939 | 5,634,623
Financial assets at fair value through profit or loss, category [Member] | Bonds And Securities [Member] | Level 2 of fair value hierarchy [Member] |  |
Disclosure of financial assets [line items] |  |
Assets book value | 529,708 | 495,495
Assets fair value | 529,708 | 495,495
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] |  |
Disclosure of financial assets [line items] |  |
Assets book value | 2,610,731 | 1,954,679
Assets fair value | 2,610,731 | 1,954,679
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] |  |
Disclosure of financial assets [line items] |  |
Assets book value | 75,425 | 71,835
Assets fair value | 75,425 | 71,835
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] |  |
Disclosure of financial assets [line items] |  |
Assets book value | 697,288 | 1,101,684
Assets fair value | 697,288 | 1,101,684
Financial assets at fair value through profit or loss, category [Member] | Other Temporary Investments One [Member] | Level 1 of fair value hierarchy [Member] |  |
Disclosure of financial assets [line items] |  |
Assets book value | 10,036 | 17,864
Assets fair value | 10,036 | 17,864
Financial assets at fair value through profit or loss, category [Member] | Other Temporary Investments Two [Member] | Level 2 of fair value hierarchy [Member] |  |
Disclosure of financial assets [line items] |  |
Assets book value | 5,858 | 13,864
Assets fair value | 5,858 | 13,864
Financial assets at amortised cost, category [Member] |  |
Disclosure of financial assets [line items] |  |
Assets book value | 4,900,695 | 4,690,125
Assets fair value | 5,001,975 | 4,790,659
Financial assets at amortised cost, category [Member] | Collaterals And Escrow Accounts [Member] |  |
Disclosure of financial assets [line items] |  |
Assets book value | 9 | 9
Assets fair value | 9 | 9
Financial assets at amortised cost, category [Member] | Trade Accounts Receivable Financial Assets [Member] |  |
Disclosure of financial assets [line items] |  |
Assets book value | 4,078,882 | 3,866,429
Assets fair value | 4,078,882 | 3,866,429
Financial assets at amortised cost, category [Member] | Sectorial Financial Assets [Member] |  |
Disclosure of financial assets [line items] |  |
Assets book value | 0 | 30,946
Assets fair value | 0 | 30,946
Financial assets at amortised cost, category [Member] | Accounts Receivable Related To The Concession Bonus From The Grant [Member] |  |
Disclosure of financial assets [line items] |  |
Assets book value | 821,804 | 792,741
Assets fair value | 923,084 | 893,275
Fair Value Through Other Comprehensive Income [Member] |  |
Disclosure of financial assets [line items] |  |
Assets book value | 17,916 | 3,922
Assets fair value | 17,916 | 3,922
Fair Value Through Other Comprehensive Income [Member] | Other Temporary Investments One [Member] | Level 3 of fair value hierarchy [Member] |  |
Disclosure of financial assets [line items] |  |
Assets book value | 14,709 | 0
Assets fair value | 14,709 | 0
Fair Value Through Other Comprehensive Income [Member] | Certified Emission Reductions [Member] | Level 2 of fair value hierarchy [Member] |  |
Disclosure of financial assets [line items] |  |
Assets book value | 3,207 | 3,922
Assets fair value | R$ 3,207 | R$ 3,922

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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: Classes of financial instruments [domain]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35H&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35M&doctype=Standard -URIDate 2024-03-27 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35N -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35N&doctype=Standard -URIDate 2024-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35I&doctype=Standard -URIDate 2024-03-27 + 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: Classes of financial instruments [domain]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 + Details
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