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Related Party Transactions (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Entity Information [Line Items]      
Assets identified R$ 57,384,156 R$ 55,819,074  
NET OPERATING REVENUE 22,651,036 21,479,468 R$ 20,535,341
Fees And Social Security Charges [Member] | Key Management Staff [Member]      
Entity Information [Line Items]      
Assets identified 0 0  
Liabilities 0 0  
NET OPERATING REVENUE 0 0 0
Cost/ expenses (40,800) (22,709) (19,734)
Pension And Healthcare Plans [Member] | Key Management Staff [Member]      
Entity Information [Line Items]      
Assets identified 0 0  
Liabilities 0 0  
NET OPERATING REVENUE 0 0 0
Cost/ expenses (1,809) (1,641) (1,384)
State Of Parana [Member] | Sanepar [Member]      
Entity Information [Line Items]      
Assets identified 445 19  
Liabilities 0 0  
NET OPERATING REVENUE 12,164 68 485
Cost/ expenses 0 0 0
State Of Parana [Member] | Dividends Payable [Member]      
Entity Information [Line Items]      
Assets identified 0 0  
Liabilities 193,265 168,032  
NET OPERATING REVENUE 0 0 0
Cost/ expenses 0 0 0
State Of Parana [Member] | Energia Solidaria Program [Member]      
Entity Information [Line Items]      
Assets identified 22,928 22,314  
Liabilities 0 0  
NET OPERATING REVENUE 0 0 0
Cost/ expenses 0 0 0
State Of Parana [Member] | Tarifa Rural Noturna Program [Member]      
Entity Information [Line Items]      
Assets identified 0 0  
Liabilities 0 0  
NET OPERATING REVENUE 0 0 0
Cost/ expenses 0 0 0
State Of Parana [Member] | Employees Transferred [Member]      
Entity Information [Line Items]      
Assets identified 342 382  
Liabilities 0 0  
NET OPERATING REVENUE 0 0 0
Cost/ expenses 0 0 0
State Of Parana [Member] | Meteorological Systemof Parana Simepar [Member]      
Entity Information [Line Items]      
Assets identified 0 0  
Liabilities 649 702  
NET OPERATING REVENUE 0 0 0
Cost/ expenses (7,879) (8,748) (7,422)
BNDES And BNDESPAR [Member] | Dividends Payable [Member] | Entities With Significant Influence [Member]      
Entity Information [Line Items]      
Liabilities 281,508 212,455  
NET OPERATING REVENUE 0 0 0
Cost/ expenses 0 0 0
BNDES And BNDESPAR [Member] | Financing [Member] | Entities With Significant Influence [Member]      
Entity Information [Line Items]      
Assets identified 0 0  
Liabilities 1,796,646 1,939,427  
NET OPERATING REVENUE 0 0 0
Cost/ expenses (164,478) (180,030) (190,881)
BNDES And BNDESPAR [Member] | Debentures Wind Farms [Member] | Entities With Significant Influence [Member]      
Entity Information [Line Items]      
Assets identified 0 0  
Liabilities 183,225 200,242  
NET OPERATING REVENUE 0 0 0
Cost/ expenses (23,509) (25,036) (28,085)
Caiua Transmissora De Energia [Member]      
Entity Information [Line Items]      
Assets identified 402 326  
Liabilities 0 0  
NET OPERATING REVENUE 4,726 3,860 3,619
Cost/ expenses 0 0 0
Caiua Transmissora De Energia [Member] | Dividends [Member]      
Entity Information [Line Items]      
Assets identified 2,836 2,737  
Liabilities 0 0  
NET OPERATING REVENUE 0 0 0
Cost/ expenses 0 0 0
Integracao Maranhense Transmissora [Member] | Dividends [Member]      
Entity Information [Line Items]      
Assets identified 3,149 739  
Liabilities 0 0  
NET OPERATING REVENUE 0 0 0
Cost/ expenses 0 0 0
Matrincha Transmissora De Energia [Member] | Dividends [Member]      
Entity Information [Line Items]      
Assets identified 14,045 14,022  
Liabilities 0 0  
NET OPERATING REVENUE 0 0 0
Cost/ expenses 0 0 0
Guaraciaba Transmissora De Energia [Member] | Dividends [Member]      
Entity Information [Line Items]      
Assets identified 34,017 44,882  
Liabilities 0 0  
NET OPERATING REVENUE 0 0 0
Cost/ expenses 0 0 0
Paranaiba Transmissora De Energia [Member] | Dividends [Member]      
Entity Information [Line Items]      
Assets identified 6,635 8,360  
Liabilities 0 0  
NET OPERATING REVENUE 0 0 0
Cost/ expenses 0 0 0
Cantareira Transmissora De Energia [Member] | Dividends [Member]      
Entity Information [Line Items]      
Assets identified 9,600 10,421  
Liabilities 0 0  
NET OPERATING REVENUE 0 0 0
Cost/ expenses 0 0 0
Mata De Santa Genebra Transmissao [Member]      
Entity Information [Line Items]      
Assets identified 2,299 2,180  
Liabilities 0 0  
NET OPERATING REVENUE 13,638 13,653 19,318
Cost/ expenses 0 0 0
Mata De Santa Genebra Transmissao [Member] | Dividends [Member]      
Entity Information [Line Items]      
Assets identified 11,527 13,837  
Liabilities 0 0  
NET OPERATING REVENUE 0 0 0
Cost/ expenses 0 0 0
Dona Francisca Energetica S A [Member] | Total for all associates [Member]      
Entity Information [Line Items]      
Assets identified 0 0  
Liabilities 1,356 1,356  
NET OPERATING REVENUE 0 0 0
Cost/ expenses (14,527) (15,345) (16,089)
Dona Francisca Energetica S A [Member] | Dividends [Member] | Total for all associates [Member]      
Entity Information [Line Items]      
Assets identified 54 514  
Liabilities 0 0  
NET OPERATING REVENUE 0 0 0
Cost/ expenses 0 0 0
Fozdo Chopim Energetica Ltda [Member] | Total for all associates [Member]      
Entity Information [Line Items]      
Assets identified 0 301  
Liabilities 0 0  
NET OPERATING REVENUE 1,456 3,570 3,360
Cost/ expenses 0 0 0
Administrative Property Rental [Member] | Other related parties [Member]      
Entity Information [Line Items]      
Assets identified 0 0  
Liabilities 130,483 120,451  
NET OPERATING REVENUE 0 0 0
Cost/ expenses (12,211) (10,091) (10,713)
Pension And Healthcare Plans [Member] | Other related parties [Member]      
Entity Information [Line Items]      
Assets identified 0 0  
Liabilities 1,158,709 1,484,243  
NET OPERATING REVENUE 0 0 0
Cost/ expenses 0 0 0
Lactec [Member] | Other related parties [Member]      
Entity Information [Line Items]      
Assets identified 7 3  
Liabilities 468 323  
NET OPERATING REVENUE 525 462 645
Cost/ expenses (1,697) (5,706) (5,004)
Tecpa [Member] | Other related parties [Member]      
Entity Information [Line Items]      
Assets identified 0 0  
Liabilities 0 0  
NET OPERATING REVENUE 2,281 2,030 2,021
Cost/ expenses 0 0 0
Celepa [Member] | Other related parties [Member]      
Entity Information [Line Items]      
Assets identified 0 0  
Liabilities 0 0  
NET OPERATING REVENUE 1,148 1,113 719
Cost/ expenses (6) (26) (11)
Assembleia Legislativa Do Parana [Member] | Other related parties [Member]      
Entity Information [Line Items]      
Assets identified 0 0  
Liabilities 0 0  
NET OPERATING REVENUE 326 319 300
Cost/ expenses 0 0 0
Portos Do Parana [Member] | Other related parties [Member]      
Entity Information [Line Items]      
Assets identified 0 0  
Liabilities 0 0  
NET OPERATING REVENUE 4,114 5,070 5,552
Cost/ expenses R$ 0 R$ 0 R$ 0