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Financial Instruments (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2024	Dec. 31, 2023
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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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]

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