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36 Related Party Transactions (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of transactions between related parties [line items]      
Assets R$ 46,784,664    
Net operating revenues 18,633,249    
Operating costs and expenses (13,347,822)    
Joint Ventures [member] | Integracao Maranhense Transmissora [Member]      
Disclosure of transactions between related parties [line items]      
Assets [1],[2] 160 R$ 161  
Operating costs and expenses [1],[2] (2,029) (1,938) R$ (1,797)
Joint Ventures [member] | Integracao Maranhense Transmissora [Member] | Dividends [Member]      
Disclosure of transactions between related parties [line items]      
Assets 3,806 4,306  
Joint Ventures [member] | Caiua Transmissora De Energia [Member]      
Disclosure of transactions between related parties [line items]      
Assets [1],[2],[3],[4] 261 256  
Liabilities [1],[2],[3],[4] 1,401 1,512  
Net operating revenues [1],[2],[3],[4] 3,114 2,792 4,250
Operating costs and expenses [1],[2],[3],[4] (16,267) (14,233) (14,869)
Joint Ventures [member] | Caiua Transmissora De Energia [Member] | Dividends [Member]      
Disclosure of transactions between related parties [line items]      
Assets 4,443 4,443  
Joint Ventures [member] | Voltalia Sao Miguel Do Gostoso - Mutual [Member]      
Disclosure of transactions between related parties [line items]      
Net operating revenues     294
Joint Ventures [member] | Voltalia Sao Miguel Do Gostoso - Mutual [Member] | Dividends [Member]      
Disclosure of transactions between related parties [line items]      
Assets 1,032 1,032  
Joint Ventures [member] | Matrincha Transmissora De Energia [Member]      
Disclosure of transactions between related parties [line items]      
Liabilities [1],[2] 959 829  
Operating costs and expenses [1],[2] (11,259) (10,137) (9,514)
Joint Ventures [member] | Matrincha Transmissora De Energia [Member] | Dividends [Member]      
Disclosure of transactions between related parties [line items]      
Assets 34,460 31,793  
Joint Ventures [member] | Guaraciaba Transmissora De Energia [Member]      
Disclosure of transactions between related parties [line items]      
Liabilities [1],[2] 436 383  
Operating costs and expenses [1],[2] (5,348) (4,853) (4,475)
Joint Ventures [member] | Guaraciaba Transmissora De Energia [Member] | Dividends [Member]      
Disclosure of transactions between related parties [line items]      
Assets 16,281 14,846  
Joint Ventures [member] | Paranaiba Transmissora De Energia [Member]      
Disclosure of transactions between related parties [line items]      
Liabilities [1],[2] 649 638  
Operating costs and expenses [1],[2] (8,141) (6,514) (6,595)
Joint Ventures [member] | Paranaiba Transmissora De Energia [Member] | Dividends [Member]      
Disclosure of transactions between related parties [line items]      
Liabilities   5,962  
Joint Ventures [member] | Cantareira Transmissora de Energia [Member]      
Disclosure of transactions between related parties [line items]      
Liabilities [1],[2] 468 467  
Operating costs and expenses [1],[2] (5,912) (5,403) (1,618)
Joint Ventures [member] | Mata De Santa Genebra Transmissao [Member]      
Disclosure of transactions between related parties [line items]      
Assets [1] 4,034 2,035  
Liabilities [1] 990 10  
Net operating revenues [1] 17,636 16,449 6,600
Operating costs and expenses [1] (7,636) (340)  
State Of Parana Investee [Member] | Sanepar [Member]      
Disclosure of transactions between related parties [line items]      
Assets [4],[5] 223 294  
Liabilities [4],[5] 582 311  
Net operating revenues [4],[5] 4,956 4,710 4,200
Operating costs and expenses [4],[5] (6,598) (5,852) (5,227)
State Of Parana Investee [Member] | Use Of Water Withdrawn From Plants Reservoirs [Member]      
Disclosure of transactions between related parties [line items]      
Net operating revenues 620 480  
Entities With Significant Influence [Member] | BNDES And BNDESPAR [Member] | Debentures Wind Farms [Member]      
Disclosure of transactions between related parties [line items]      
Liabilities [6] 239,249 253,877  
Operating costs and expenses [6] (25,891) (28,240) (30,316)
Entities With Significant Influence [Member] | BNDES And BNDESPAR [Member] | Debentures Compagas [Member]      
Disclosure of transactions between related parties [line items]      
Liabilities 5,890 11,783  
Operating costs and expenses (1,681) (1,194) (2,625)
Entities With Significant Influence [Member] | BNDES And BNDESPAR [Member] | Financing [Member]      
Disclosure of transactions between related parties [line items]      
Liabilities 2,314,166 2,231,409  
Operating costs and expenses (151,850) (175,461) (131,379)
Entities With Significant Influence [Member] | BNDES And BNDESPAR [Member] | Dividends Payable [Member]      
Disclosure of transactions between related parties [line items]      
Liabilities [7] 568,315 130,204  
Controlling Shareholder [Member] | State of Parana [Member] | Meteorological System of Parana - Simepar [Member]      
Disclosure of transactions between related parties [line items]      
Assets [4],[8] 2 10  
Liabilities [4],[8] 855 705  
Net operating revenues 48 [4],[8] 58 [4],[8] 54
Operating costs and expenses (8,573) [4],[8] (7,087) [4],[8] (1,559) [9]
Controlling Shareholder [Member] | State of Parana [Member] | Telecommunication Services [Member]      
Disclosure of transactions between related parties [line items]      
Assets [4] 13,686 16,278  
Net operating revenues [4] 43,248 43,011 41,375
Controlling Shareholder [Member] | State of Parana [Member] | Morar Bem Parana Program [Member]      
Disclosure of transactions between related parties [line items]      
Assets [10] 1,057    
Controlling Shareholder [Member] | State of Parana [Member] | Tarifa Rural Noturna Program [Member]      
Disclosure of transactions between related parties [line items]      
Assets [10] 8,168 7,639  
Controlling Shareholder [Member] | State of Parana [Member] | Luz Fraterna Program [Member]      
Disclosure of transactions between related parties [line items]      
Assets [10] 6,682 7,478  
Controlling Shareholder [Member] | State of Parana [Member] | CRC Transfer [Member]      
Disclosure of transactions between related parties [line items]      
Assets 1,392,624 1,350,685  
Net operating revenues 341,964 184,229 188,797
Controlling Shareholder [Member] | State of Parana [Member] | Dividends Payable [Member]      
Disclosure of transactions between related parties [line items]      
Liabilities 749,338 190,664  
Controlling Shareholder [Member] | State of Parana [Member] | Employees Transferred [Member]      
Disclosure of transactions between related parties [line items]      
Assets [8] 87 33  
Associates [Member] | Dona Francisca Energetica S.A [Member]      
Disclosure of transactions between related parties [line items]      
Assets [1] 13 40  
Liabilities [1] 1,436 1,436  
Net operating revenues [1] 162 145  
Operating costs and expenses [1] (17,078) (16,905) (16,903)
Associates [Member] | Foz do Chopim Energetica Ltda. [Member]      
Disclosure of transactions between related parties [line items]      
Assets 216 209  
Net operating revenues 2,675 2,538 2,668
Associates [Member] | Sercomtel S.A. Telecomunicacoes [Member]      
Disclosure of transactions between related parties [line items]      
Assets   4,436  
Net operating revenues 8,299 8,354 8,051
Operating costs and expenses 4 (21) (4)
Key Management Staff [Member] | Fees And Social Security Charges [Member]      
Disclosure of transactions between related parties [line items]      
Operating costs and expenses 21,935 (25,860) (27,368)
Key Management Staff [Member] | Pension And Healthcare Plans [Member]      
Disclosure of transactions between related parties [line items]      
Operating costs and expenses (1,116) (1,560) (1,725)
Other Related Parties [Member] | Pension And Healthcare Plans [Member]      
Disclosure of transactions between related parties [line items]      
Liabilities 1,493,614 1,194,936  
Other Related Parties [Member] | Administrative Property Rental [Member]      
Disclosure of transactions between related parties [line items]      
Liabilities 1,836 14,662  
Operating costs and expenses (1,285) (2,520) (15,396)
Other Related Parties [Member] | Fundacao Copel [Member]      
Disclosure of transactions between related parties [line items]      
Assets 40 9  
Net operating revenues 315 285 299
Other Related Parties [Member] | Lactec      
Disclosure of transactions between related parties [line items]      
Assets [4],[11] 5 4  
Liabilities [4],[11] 2,747 1,507  
Net operating revenues [4],[11] 771 746  
Operating costs and expenses [4],[11] (2,702) (2,787) (4,026)
Other Related Parties [Member] | Tecpa [member]      
Disclosure of transactions between related parties [line items]      
Assets 11 [4] 9  
Net operating revenues 862 [4] 81 68
Other Related Parties [Member] | Celepa [member]      
Disclosure of transactions between related parties [line items]      
Assets 4 [4],[12] 15  
Liabilities [4],[12] 2 21  
Net operating revenues 51 [4],[12] 112 R$ 85
Operating costs and expenses [4],[12] R$ (50) R$ (5)  
[1] Charges for use of the transmission system due by Copel GeT, UEG Araucaria and wind farms.
[2] Copel DIS maintains a Contract for the Use of Transmission System (Cust) with ONS and power transmission concession operators whose subject matter is the contracting of Transmission System Use Amount (Must). Contracting is permanent and is regulated by ANEEL Normative Resolution 666/2015. Amounts are defined for four subsequent years, with annual reviews.
[3] Operation and maintenance services agreement provided by Copel GeT, maturing on May 9, 2021. Transmission System Connection Agreement - CCT executed by Copel DIS, expiring by the end of the concession agreement of the distribution or transmission company, whichever takes place first.
[4] Revenue of Copel TEL from telecommunications services and lease of equipment and infrastructure. The balances presented are net of expected credit losses.
[5] Basic sanitation provided by Sanepar.
[6] BNDES and BNDESPAR acquired all the debentures issued by the subsidiaries Nova Asa Branca I, Nova Asa Branca II, Nova Asa Branca III, Nova Eurus IV and Ventos de Santo Uriel.
[7] BNDES is the parent company of BNDES Participacoes S.A. - BNDESPAR, which owns Copel shares (Note 30.1). On December 22, 2018, the shareholder agreement between the State of Parana and BNDESPAR, signed on December 22, 1998, was ended.
[8] Reimbursement of wages and social charges for employees transferred to the Parana State Government. Balances presented are net of expected credit loss.
[9] The Sistema Meteorologico do Parana - Simepar is a supplementary unit of the Independent Social Service Parana Technology, linked to the State Department of Science, Technology and Higher Education. Simepar has contracts with Copel for services of weather forecast, meteorological reports, ampacity analysis, mapping and analyses of winds and atmospheric discharges.
[10] The Luz Fraterna Program created under Law 491/2013 and 17,639/2013 establishes the payment of electricity consumption to benefit low-income families, residing in the State of Parana, whose properties - consumer units - are used exclusively for residential purposes, whether in urban or rural areas, and fulfill the requirements established in articles 3 and 4 of this law.
[11] The Institute of Technology for Development (Lactec) is a Public Interest Civil Society Organization (OSCIP), in which Copel is an associate. Lactec has service and R&D contracts with Copel GeT, UEGA and Copel DIS, which are subject to prior or later control and approval by ANEEL. Copel COM provides services and sells energy to the institute.
[12] Service agreements entered into with the Parana Information Technology Company (Celepar), a mixed capital company that is part of the indirect administration of the State Government