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Related Party Transactions (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Entity Information [Line Items]      
Assets R$ 55,819,074 R$ 49,703,700  
Revenue 21,479,468 20,535,341 R$ 20,976,216
Fees And Social Security Charges [Member] | Key Management Staff [Member]      
Entity Information [Line Items]      
Assets  
Liabilities  
Revenue
Cost/ expenses (22,709) (19,734) (19,418)
Pension And Healthcare Plans [Member] | Key Management Staff [Member]      
Entity Information [Line Items]      
Assets  
Liabilities  
Revenue
Cost/ expenses (1,641) (1,384) (1,422)
State Of Parana [Member] | Dividends Payable [Member] | Entities With Significant Influence [Member]      
Entity Information [Line Items]      
Assets  
Liabilities 168,032 109,777  
Revenue
Cost/ expenses
State Of Parana [Member] | CRC Transfer [member] | Entities With Significant Influence [Member]      
Entity Information [Line Items]      
Assets  
Liabilities  
Revenue 253,990
Cost/ expenses
State Of Parana [Member] | Energia Solidaria Program [Member] | Entities With Significant Influence [Member]      
Entity Information [Line Items]      
Assets 22,314 9,735  
Liabilities  
Revenue
Cost/ expenses
State Of Parana [Member] | Tarifa Rural Noturna Program [Member] | Entities With Significant Influence [Member]      
Entity Information [Line Items]      
Assets 8,353  
Liabilities  
Revenue
Cost/ expenses
State Of Parana [Member] | Employees Transferred [Member] | Entities With Significant Influence [Member]      
Entity Information [Line Items]      
Assets 382 305  
Liabilities  
Revenue
Cost/ expenses
State Of Parana [Member] | Meteorological Systemof Parana Simepar [Member] | Entities With Significant Influence [Member]      
Entity Information [Line Items]      
Assets  
Liabilities 702 298  
Revenue
Cost/ expenses (8,748) (7,422) (10,759)
BNDES And BNDESPAR [member] | Dividends Payable [Member] | Entities With Significant Influence [Member]      
Entity Information [Line Items]      
Assets  
Liabilities 212,455 76,684  
Revenue
Cost/ expenses
BNDES And BNDESPAR [member] | Financing [Member] | Entities With Significant Influence [Member]      
Entity Information [Line Items]      
Assets  
Liabilities 1,939,427 2,097,606  
Revenue
Cost/ expenses (180,030) (190,881) (174,210)
BNDES And BNDESPAR [member] | Debentures Wind Farms [Member] | Entities With Significant Influence [Member]      
Entity Information [Line Items]      
Assets  
Liabilities 200,242 216,811  
Revenue
Cost/ expenses (25,036) (28,085) (32,249)
Sanepar [Member] | Entities With Significant Influence [Member]      
Entity Information [Line Items]      
Assets 19  
Liabilities 82 448  
Revenue 68
Cost/ expenses (2,384) (2,088) (2,015)
Use Water Eithdrawn From Plants Reservoirs [Member] | Entities With Significant Influence [Member]      
Entity Information [Line Items]      
Assets  
Liabilities  
Revenue 485 477
Cost/ expenses
Voltalia Sao Miguel Do Gostoso [Member] | Joint ventures [member]      
Entity Information [Line Items]      
Assets 10  
Liabilities  
Revenue 115 112 102
Cost/ expenses
Voltalia Sao Miguel Do Gostoso [Member] | Dividends [Member] | Joint ventures [member]      
Entity Information [Line Items]      
Assets 1,032  
Liabilities  
Revenue
Cost/ expenses
Caiua Transmissora De Energia [Member] | Joint ventures [member]      
Entity Information [Line Items]      
Assets 326 313  
Liabilities 228 1,400  
Revenue 3,860 3,619 3,268
Cost/ expenses (21,103) (19,749) (17,429)
Caiua Transmissora De Energia [Member] | Dividends [Member] | Joint ventures [member]      
Entity Information [Line Items]      
Assets 2,737 5,486  
Liabilities  
Revenue
Cost/ expenses
Integracao Maranhense Transmissora [Member] | Joint ventures [member]      
Entity Information [Line Items]      
Assets  
Liabilities 49 120  
Revenue
Cost/ expenses (3,255) (2,624) (2,250)
Integracao Maranhense Transmissora [Member] | Dividends [Member] | Joint ventures [member]      
Entity Information [Line Items]      
Assets 739 6,885  
Liabilities  
Revenue
Cost/ expenses
Matrincha Transmissora De Energia [Member] | Joint ventures [member]      
Entity Information [Line Items]      
Assets  
Liabilities 235 1,355  
Revenue
Cost/ expenses (17,326) (15,751) (13,185)
Matrincha Transmissora De Energia [Member] | Dividends [Member] | Joint ventures [member]      
Entity Information [Line Items]      
Assets 14,022 41,577  
Liabilities  
Revenue
Cost/ expenses
Guaraciaba Transmissora De Energia [Member] | Joint ventures [member]      
Entity Information [Line Items]      
Assets  
Liabilities 111 671  
Revenue
Cost/ expenses (8,938) (7,191) (6,067)
Guaraciaba Transmissora De Energia [Member] | Dividends [Member] | Joint ventures [member]      
Entity Information [Line Items]      
Assets 44,882 50,137  
Liabilities  
Revenue
Cost/ expenses
Paranaiba Transmissora De Energia [Member] | Joint ventures [member]      
Entity Information [Line Items]      
Assets  
Liabilities 155 869  
Revenue
Cost/ expenses (10,950) (10,322) (8,995)
Paranaiba Transmissora De Energia [Member] | Dividends [Member] | Joint ventures [member]      
Entity Information [Line Items]      
Assets 8,360 5,400  
Liabilities  
Revenue
Cost/ expenses
Cantareira Transmissora De Energia [Member] | Joint ventures [member]      
Entity Information [Line Items]      
Assets  
Liabilities 119 660  
Revenue
Cost/ expenses (8,736) (8,042) (6,435)
Cantareira Transmissora De Energia [Member] | Dividends [Member] | Joint ventures [member]      
Entity Information [Line Items]      
Assets 10,421 9,254  
Liabilities  
Revenue
Cost/ expenses
Mata De Santa Genebra Transmissao [Member] | Joint ventures [member]      
Entity Information [Line Items]      
Assets 2,180 3,236  
Liabilities 259 1,401  
Revenue 13,653 19,318 18,795
Cost/ expenses (19,778) (17,427) (12,390)
Mata De Santa Genebra Transmissao [Member] | Dividends [Member] | Joint ventures [member]      
Entity Information [Line Items]      
Assets 13,837 13,333  
Liabilities  
Revenue
Cost/ expenses
Solar Parana [Member] | Dividends [Member] | Joint ventures [member]      
Entity Information [Line Items]      
Assets 48  
Liabilities  
Revenue
Cost/ expenses
Dona Francisca Energetica S A [Member] | Associates [member]      
Entity Information [Line Items]      
Assets 14 15  
Liabilities 1,356 1,356  
Revenue 177 174 164
Cost/ expenses (15,345) (16,089) (16,239)
Dona Francisca Energetica S A [Member] | Dividends [Member] | Associates [member]      
Entity Information [Line Items]      
Assets 514 852  
Liabilities  
Revenue
Cost/ expenses
Fozdo Chopim Energetica Ltda [Member] | Associates [member]      
Entity Information [Line Items]      
Assets 312 302  
Liabilities  
Revenue 3,705 3,493 3,010
Cost/ expenses
Administrative Property Rental [Member] | Other related parties [member]      
Entity Information [Line Items]      
Assets  
Liabilities 120,451 102,410  
Revenue
Cost/ expenses (10,091) (10,713) (6,827)
Pension And Healthcare Plans [Member] | Other related parties [member]      
Entity Information [Line Items]      
Assets  
Liabilities 1,484,243 1,070,037  
Revenue
Cost/ expenses
Lactec [Member] | Other related parties [member]      
Entity Information [Line Items]      
Assets 3 3  
Liabilities 323 1,131  
Revenue 462 645 594
Cost/ expenses (5,706) (5,004) (3,900)
Tecpa [Member] | Other related parties [member]      
Entity Information [Line Items]      
Assets  
Liabilities  
Revenue 2,030 2,021 2,014
Cost/ expenses
Celepa [Member] | Other related parties [member]      
Entity Information [Line Items]      
Assets  
Liabilities  
Revenue 1,113 719
Cost/ expenses (26) (11) (8)
Assembleia Legislativa Do Parana [Member] | Other related parties [member]      
Entity Information [Line Items]      
Assets  
Liabilities  
Revenue 319 300
Cost/ expenses
Portos Do Parana [Member] | Other related parties [member]      
Entity Information [Line Items]      
Assets  
Liabilities  
Revenue 5,070 5,552 3,094
Cost/ expenses