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21 Loans and Financing (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]      
Final maturity The term of these securities ranges from 1 to 52 months from the end of the reporting period.    
Loans and financing R$ 3,142,383 R$ 4,047,307 R$ 3,759,505
Gross debt 3,168,710 4,079,383  
Transaction cost (26,327) (32,076)  
Net debt 3,142,383 4,047,307  
Loans and financing, current 255,521 1,113,047  
Loans and financing, noncurrent 2,886,862 2,934,260  
Foreign Currency [Member]      
Disclosure of detailed information about borrowings [line items]      
Loans and financing 108,983 104,751 89,270
Loans and financing, noncurrent R$ 103,646    
Foreign Currency [Member] | National Treasury Department (STN - Secretaria do Tesouro Nacional) [Member] | Par Bond [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract Par Bond    
Company Copel    
Allocation Debt negotiation    
Guarantees Guarantees deposited (21.1).    
Issue date May 20, 1998    
Number of installments 1    
Final maturity Apr. 11, 2024    
Finance charges Half-yearly    
Contractual financial charges p.y. 6.0% + 0.20%    
Effective interest rate p.y. 6.0% + 0.20%    
Contract amount R$ 17,315    
Loans and financing R$ 64,325 61,837  
Foreign Currency [Member] | National Treasury Department (STN - Secretaria do Tesouro Nacional) [Member] | Discount Bond [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract Discount Bond    
Company Copel    
Allocation Debt negotiation    
Guarantees Guarantees deposited (21.1).    
Issue date May 20, 1998    
Number of installments 1    
Final maturity Apr. 11, 2024    
Finance charges Half-yearly    
Contractual financial charges p.y. 3.5% + 0.20%    
Effective interest rate p.y. 3.5% + 0.20%    
Contract amount R$ 12,082    
Loans and financing 44,658 42,914  
Local Currency [Member]      
Disclosure of detailed information about borrowings [line items]      
Loans and financing 3,033,400 3,942,556 R$ 3,670,235
Loans and financing, noncurrent R$ 2,830,614    
Local Currency [Member] | Promissory Notes [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract Promissory notes    
Company Copel GeT    
Allocation Payment of the first installment of debentures and cash enhancement of Copel Get.    
Guarantees Surety of Copel.    
Issue date May 12, 2017    
Number of installments 1    
Final maturity May 12, 2019    
Finance charges Single installment    
Contractual financial charges p.y. 117% of DI    
Effective interest rate p.y. 117% of DI    
Contract amount R$ 500,000    
Loans and financing 572,419  
Local Currency [Member] | Banco Do Brasil [Member]      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 679,976 1,016,039  
Local Currency [Member] | Banco Do Brasil [Member] | CCB 330.600.773 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract CCB 330.600.773    
Company Copel DIS    
Allocation Working capital.    
Guarantees Credit assignment.    
Issue date Jul. 11, 2014    
Number of installments 3    
Final maturity Jul. 11, 2019    
Finance charges Half-yearly    
Contractual financial charges p.y. 111.8% of DI    
Effective interest rate p.y. 111.8% of DI    
Contract amount R$ 116,667    
Loans and financing 40,173  
Local Currency [Member] | Banco Do Brasil [Member] | CFX 17/35959-7 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract CFX 17/35959-7    
Company Copel DIS    
Allocation Working capital.    
Guarantees Credit assignment.    
Issue date May 16, 2017    
Number of installments 2    
Final maturity May 06, 2019    
Finance charges Quarterly    
Contractual financial charges p.y. 12.00%    
Effective interest rate p.y. 12.00%    
Contract amount R$ 75,000    
Loans and financing 38,262  
Local Currency [Member] | Banco Do Brasil [Member] | CCB 21/00851-5 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract CCB 21/00851-5    
Company Copel DIS    
Allocation Working capital.    
Guarantees Credit assignment.    
Issue date Jun. 30, 2017    
Number of installments 2    
Final maturity Jun. 13, 2019    
Finance charges Quarterly    
Contractual financial charges p.y. 11.00%    
Effective interest rate p.y. 11.00%    
Contract amount R$ 38,889    
Loans and financing 19,644  
Local Currency [Member] | Banco Do Brasil [Member] | CCB 17/35960-0 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract CCB 17/35960-0    
Company Copel DIS    
Allocation Working capital.    
Guarantees Credit assignment.    
Issue date Jul. 27, 2017    
Number of installments 2    
Final maturity Jul. 17, 2019    
Finance charges Quarterly    
Contractual financial charges p.y. 11.00%    
Effective interest rate p.y. 11.00%    
Contract amount R$ 50,333    
Loans and financing 51,681  
Local Currency [Member] | Banco Do Brasil [Member] | CFX 17/35958-9 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract CFX 17/35958-9    
Company Copel DIS    
Allocation Working capital.    
Guarantees Credit assignment.    
Issue date Aug. 15, 2017    
Number of installments 2    
Final maturity Aug. 05, 2019    
Finance charges Quarterly    
Contractual financial charges p.y. 11.00%    
Effective interest rate p.y. 11.00%    
Contract amount R$ 58,333    
Loans and financing 59,366  
Local Currency [Member] | Banco Do Brasil [Member] | NCI 330.600.132 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract NCI 330.600.132    
Company Copel HOL    
Allocation Working capital.    
Guarantees Credit assignment.    
Issue date Feb. 28, 2007    
Number of installments 3    
Final maturity Feb. 28, 2019    
Finance charges Half-yearly    
Contractual financial charges p.y. 107.8% of DI    
Effective interest rate p.y. 107.8% of DI    
Contract amount R$ 231,000    
Loans and financing 78,735  
Local Currency [Member] | Banco Do Brasil [Member] | CCB 306.401.381 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract CCB 306.401.381    
Company Copel HOL    
Allocation Working capital.    
Guarantees Credit assignment.    
Issue date Dec. 19, 2019    
Number of installments 5    
Final maturity Mar. 25, 2022    
Finance charges Quarterly    
Contractual financial charges p.y. 120.00% of DI    
Effective interest rate p.y. 126.99% of DI    
Contract amount R$ 640,005    
Loans and financing R$ 640,530 648,953  
Local Currency [Member] | Banco Do Brasil [Member] | NCI 306.401.445 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract NCI 306.401.445    
Company Copel HOL    
Allocation Working capital.    
Guarantees Credit assignment.    
Issue date Feb. 24, 2017    
Number of installments 2    
Final maturity Feb. 15, 2020    
Finance charges Half-yearly    
Contractual financial charges p.y. 124.5% of DI    
Effective interest rate p.y. 136.15% of DI    
Contract amount R$ 77,000    
Loans and financing 39,446 648,953  
Local Currency [Member] | Banco Do Brasil [Member] | Contract [Member]      
Disclosure of detailed information about borrowings [line items]      
Loans and financing   79,225  
Local Currency [Member] | Eletrobras [Member]      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 10,934 21,622  
Local Currency [Member] | Eletrobras [Member] | 981/95 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 981/95    
Company Copel DIS    
Allocation National Program for Watering - Proni. Rural Electricity Program - Luz para Todos.    
Guarantees Own revenue; issue of promissory notes and commercial duplicates.    
Issue date Dec. 22, 1994    
Number of installments 80    
Final maturity Aug. 15, 2019    
Finance charges Quarterly    
Contractual financial charges p.y. 8.00%    
Effective interest rate p.y. 8.00%    
Contract amount R$ 1,169    
Loans and financing 49  
Local Currency [Member] | Eletrobras [Member] | 982/95 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 982/95    
Company Copel DIS    
Allocation National Program for Watering - Proni. Rural Electricity Program - Luz para Todos.    
Guarantees Own revenue; issue of promissory notes and commercial duplicates.    
Issue date Dec. 22, 1994    
Number of installments 80    
Final maturity Nov. 15, 2019    
Finance charges Quarterly    
Contractual financial charges p.y. 8.00%    
Effective interest rate p.y. 8.00%    
Contract amount R$ 1,283    
Loans and financing 24  
Local Currency [Member] | Eletrobras [Member] | 983/95 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 983/95    
Company Copel DIS    
Allocation National Program for Watering - Proni. Rural Electricity Program - Luz para Todos.    
Guarantees Own revenue; issue of promissory notes and commercial duplicates.    
Issue date Dec. 22, 1994    
Number of installments 80    
Final maturity Nov. 15, 2020    
Finance charges Quarterly    
Contractual financial charges p.y. 8.00%    
Effective interest rate p.y. 8.00%    
Contract amount R$ 11    
Loans and financing R$ 26 51  
Local Currency [Member] | Eletrobras [Member] | 984/95 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 984/95    
Company Copel DIS    
Allocation National Program for Watering - Proni. Rural Electricity Program - Luz para Todos.    
Guarantees Own revenue; issue of promissory notes and commercial duplicates.    
Issue date Dec. 22, 1994    
Number of installments 80    
Final maturity Nov. 15, 2020    
Finance charges Quarterly    
Contractual financial charges p.y. 8.00%    
Effective interest rate p.y. 8.00%    
Contract amount R$ 14    
Loans and financing R$ 11 22  
Local Currency [Member] | Eletrobras [Member] | 985/95 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 985/95    
Company Copel DIS    
Allocation National Program for Watering - Proni. Rural Electricity Program - Luz para Todos.    
Guarantees Own revenue; issue of promissory notes and commercial duplicates.    
Issue date Dec. 22, 1994    
Number of installments 80    
Final maturity Aug. 15, 2021    
Finance charges Quarterly    
Contractual financial charges p.y. 8.00%    
Effective interest rate p.y. 8.00%    
Contract amount R$ 61    
Loans and financing R$ 11 17  
Local Currency [Member] | Eletrobras [Member] | 206/07 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 206/07    
Company Copel DIS    
Allocation National Program for Watering - Proni. Rural Electricity Program - Luz para Todos.    
Guarantees Own revenue; issue of promissory notes and commercial duplicates.    
Issue date Mar. 03, 2008    
Number of installments 120    
Final maturity Aug. 30, 2020    
Finance charges Monthly    
Contractual financial charges p.y. 5.0% + 1.0%    
Effective interest rate p.y. 5.05%    
Contract amount R$ 109,642    
Loans and financing R$ 5,953 14,882  
Local Currency [Member] | Eletrobras [Member] | 273/09 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 273/09    
Company Copel DIS    
Allocation National Program for Watering - Proni. Rural Electricity Program - Luz para Todos.    
Guarantees Own revenue; issue of promissory notes and commercial duplicates.    
Issue date Feb. 18, 2010    
Number of installments 120    
Final maturity Dec. 30, 2022    
Finance charges Monthly    
Contractual financial charges p.y. 5.0% + 1.0%    
Effective interest rate p.y. 5.0% + 1.0%    
Contract amount R$ 63,944    
Loans and financing 4,933 6,577  
Local Currency [Member] | Caixa Econonica Federal [Member]      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 13,741 15,794  
Local Currency [Member] | Caixa Econonica Federal [Member] | 415.855-22/14 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 415.855-22/14    
Company Copel DIS    
Allocation Rural Electricity Program - Luz para Todos. Acquisition of machinery, equipment and IT and automation equipment.    
Guarantees Own revenue; issue of promissory notes and commercial duplicates.    
Issue date Mar. 31, 2015    
Number of installments 120    
Final maturity Dec. 08, 2026    
Finance charges Monthly    
Contractual financial charges p.y. 6.00%    
Effective interest rate p.y. 6.00%    
Contract amount R$ 16,984    
Loans and financing R$ 13,410 15,298  
Local Currency [Member] | Caixa Econonica Federal [Member] | 3153-352 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 3153-352    
Company Copel DIS    
Allocation Rural Electricity Program - Luz para Todos. Acquisition of machinery, equipment and IT and automation equipment.    
Guarantees Assignment of trade notes receivable.    
Issue date Nov. 01, 2016    
Number of installments 36    
Final maturity Dec. 15, 2021    
Finance charges Quarterly    
Contractual financial charges p.y. 5.5 % above TJLP    
Effective interest rate p.y. 5.5 % above TJLP    
Contract amount R$ 1,156    
Loans and financing 331 496  
Local Currency [Member] | Finep [Member]      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 4,845 10,659  
Local Currency [Member] | Finep [Member] | 21120105-00 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 21120105-00    
Company Copel Tel    
Allocation BEL project - ultra wide band intranet service (Ultra Wide Band - UWB).    
Guarantees Lock of proceeds received in current account.    
Issue date Jul. 17, 2012    
Number of installments 81    
Final maturity Oct. 15, 2020    
Finance charges Monthly    
Contractual financial charges p.y. 4.00%    
Effective interest rate p.y. 4.39%    
Contract amount R$ 35,095    
Loans and financing R$ 2,626 5,778  
Local Currency [Member] | Finep [Member] | 21120105-00 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 21120105-00    
Company Copel Tel    
Allocation BEL project - ultra wide band intranet service (Ultra Wide Band - UWB).    
Guarantees Lock of proceeds received in current account.    
Issue date Jul. 17, 2012    
Number of installments 81    
Final maturity Oct. 15, 2020    
Finance charges Monthly    
Contractual financial charges p.y. 3.5% + TR    
Effective interest rate p.y. 3.88% + TR    
Contract amount R$ 17,103    
Loans and financing 2,219 4,881  
Local Currency [Member] | BNDES [Member]      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 2,254,424 2,230,775  
Local Currency [Member] | BNDES [Member] | 820989.1 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 820989.1    
Company Copel GeT    
Allocation Implementation of Mauá HPP.    
Guarantees Revenue from energy sales from the plant.    
Issue date Mar. 17, 2009    
Number of installments 179    
Final maturity Jan. 15, 2028    
Finance charges Monthly    
Contractual financial charges p.y. 1.63% above TJLP    
Effective interest rate p.y. 1.63% above TJLP    
Contract amount R$ 169,500    
Loans and financing R$ 95,807 107,324  
Local Currency [Member] | BNDES [Member] | 1120952.1 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 1120952.1    
Company Copel GeT    
Allocation Implementation of transmission line between Foz do Iguaçu and Cascavel Oeste substations.    
Guarantees Assignment of receivables; revenue from energy transmission services.    
Issue date Dec. 16, 2011    
Number of installments 168    
Final maturity Apr. 15, 2026    
Finance charges Monthly    
Contractual financial charges p.y. 1.82% above TJLP    
Effective interest rate p.y. 1.82% above TJLP    
Contract amount R$ 44,723    
Loans and financing R$ 21,090 24,344  
Local Currency [Member] | BNDES [Member] | 1220768.1 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 1220768.1    
Company Copel GeT    
Allocation Implementation of Cavernoso II SHP.    
Guarantees Revenue from energy sales from the plant.    
Issue date Sep. 28, 2012    
Number of installments 192    
Final maturity Jul. 15, 2029    
Finance charges Monthly    
Contractual financial charges p.y. 1.36% above TJLP    
Effective interest rate p.y. 1.36% above TJLP    
Contract amount R$ 73,122    
Loans and financing R$ 46,240 50,908  
Local Currency [Member] | BNDES [Member] | 13211061 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 13211061    
Company Copel GeT    
Allocation Implementation of Colíder HPP.    
Guarantees Assignment of receivables    
Issue date Dec. 04, 2013    
Number of installments 192    
Final maturity Oct. 15, 2031    
Finance charges Monthly    
Contractual financial charges p.y. 0% and 1.49% above TJLP    
Effective interest rate p.y. 6.43% and 7.68%    
Contract amount R$ 1,041,155    
Loans and financing R$ 817,329 844,940  
Local Currency [Member] | BNDES [Member] | 13210331 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 13210331    
Company Copel GeT    
Allocation Implementation of Cerquilho III substation.    
Guarantees Assignment of receivables    
Issue date Dec. 03, 2013    
Number of installments 168    
Final maturity Aug. 15, 2028    
Finance charges Monthly    
Contractual financial charges p.y. 1.49% and 1.89% above TJLP    
Effective interest rate p.y. 1.49% and 1.89% above TJLP    
Contract amount R$ 17,644    
Loans and financing R$ 11,385 12,659  
Local Currency [Member] | BNDES [Member] | 15206041 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 15206041    
Company Copel GeT    
Allocation Implementation of transmission line Assis - Paraguaçu Paulista II.    
Guarantees Assignment of receivables    
Issue date Dec. 28, 2015    
Number of installments 168    
Final maturity Jun. 15, 2030    
Finance charges Monthly    
Contractual financial charges p.y. 2.42% above TJLP    
Effective interest rate p.y. 9.04%    
Contract amount R$ 34,265    
Loans and financing R$ 22,419 24,477  
Local Currency [Member] | BNDES [Member] | 15205921 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 15205921    
Company Copel GeT    
Allocation Implementation of transmission lines Londrina - Figueira and Salto Osório - Foz do Chopim.    
Guarantees Assignment of receivables    
Issue date Dec. 28, 2015    
Number of installments 168    
Final maturity Dec. 15, 2029    
Finance charges Monthly    
Contractual financial charges p.y. 2.32% above TJLP    
Effective interest rate p.y. 8.93%    
Contract amount R$ 21,584    
Loans and financing R$ 13,526 14,832  
Local Currency [Member] | BNDES [Member] | 18205101 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 18205101    
Company Copel GeT    
Allocation Implementation of Baixo Iguaçu HPP.    
Guarantees Assignment of receivables    
Issue date Nov. 22, 2018    
Number of installments 192    
Final maturity Jun. 15, 2035    
Finance charges Monthly    
Contractual financial charges p.y. 1.94% above TJLP    
Effective interest rate p.y. 8.50%    
Contract amount R$ 194,000    
Loans and financing R$ 196,827 162,229  
Local Currency [Member] | BNDES [Member] | 14205611-A [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 14205611-A    
Company Copel DIS    
Allocation Preservation of business, improvements, operating support and general investments in the expansion and consolidation of projects and social investment programs of companies (ISE).    
Guarantees Surety of Copel; assignment of revenues and indemnity rights under the concession.    
Issue date Dec. 15, 2014    
Number of installments 72    
Final maturity Jan. 15, 2021    
Finance charges Monthly    
Contractual financial charges p.y. 2.09% above TJLP    
Effective interest rate p.y. 8.37%    
Contract amount R$ 41,583    
Loans and financing R$ 7,611 14,591  
Local Currency [Member] | BNDES [Member] | 14205611-B [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 14205611-B    
Company Copel DIS    
Allocation Preservation of business, improvements, operating support and general investments in the expansion and consolidation of projects and social investment programs of companies (ISE).    
Guarantees Surety of Copel; assignment of revenues and indemnity rights under the concession.    
Issue date Dec. 15, 2014    
Number of installments 6    
Final maturity Feb. 15, 2021    
Finance charges Annual    
Contractual financial charges p.y. 2.09 above TR BNDES    
Effective interest rate p.y. 2.09 above TR BNDES    
Contract amount R$ 17,821    
Loans and financing R$ 8,288 11,992  
Local Currency [Member] | BNDES [Member] | 14205611-C [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 14205611-C    
Company Copel DIS    
Allocation Preservation of business, improvements, operating support and general investments in the expansion and consolidation of projects and social investment programs of companies (ISE).    
Guarantees Surety of Copel; assignment of revenues and indemnity rights under the concession.    
Issue date Dec. 15, 2014    
Number of installments 113    
Final maturity Jun. 15, 2024    
Finance charges Monthly    
Contractual financial charges p.y. 6.00%    
Effective interest rate p.y. 6.00%    
Contract amount R$ 78,921    
Loans and financing R$ 35,267 43,097  
Local Currency [Member] | BNDES [Member] | 14205611-D [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 14205611-D    
Company Copel DIS    
Allocation Preservation of business, improvements, operating support and general investments in the expansion and consolidation of projects and social investment programs of companies (ISE).    
Guarantees Surety of Copel; assignment of revenues and indemnity rights under the concession.    
Issue date Dec. 15, 2014    
Number of installments 57    
Final maturity Feb. 15, 2021    
Finance charges Monthly    
Contractual financial charges p.y. TJLP    
Effective interest rate p.y. TJLP    
Contract amount R$ 750    
Loans and financing R$ 11 20  
Local Currency [Member] | BNDES [Member] | 14.2.1271.1 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 14.2.1271.1    
Company Santa Maria    
Allocation Construction and implementation of wind generating plants.    
Guarantees Surety of Copel; pledge of shares; assignment of receivables and revenues.    
Issue date Jun. 01, 2015    
Number of installments 192    
Final maturity Aug. 15, 2031    
Finance charges Monthly    
Contractual financial charges p.y. 1.66% above TJLP    
Effective interest rate p.y. 8.26%    
Contract amount R$ 71,676    
Loans and financing R$ 45,582 49,336  
Local Currency [Member] | BNDES [Member] | 14.2.1272.1 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 14.2.1272.1    
Company Santa Helena    
Allocation Construction and implementation of wind generating plants.    
Guarantees Surety of Copel; pledge of shares; assignment of receivables and revenues.    
Issue date Jun. 01, 2015    
Number of installments 192    
Final maturity Aug. 15, 2031    
Finance charges Monthly    
Contractual financial charges p.y. 1.66% above TJLP    
Effective interest rate p.y. 8.26%    
Contract amount R$ 82,973    
Loans and financing R$ 49,458 53,531  
Local Currency [Member] | BNDES [Member] | 11211521 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 11211521    
Company GE Farol    
Allocation Construction and implementation of wind generating plants.    
Guarantees Pledge of shares; assignment of receivables from energy sales from the project; assignment of machinery and equipment.    
Issue date Mar. 19, 2012    
Number of installments 192    
Final maturity Jun. 15, 2030    
Finance charges Monthly    
Contractual financial charges p.y. 2.34% above TJLP    
Effective interest rate p.y. 2.34% above TJLP    
Contract amount R$ 54,100    
Loans and financing R$ 41,388 45,158  
Local Currency [Member] | BNDES [Member] | 11211531 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 11211531    
Company GE Boa Vista    
Allocation Construction and implementation of wind generating plants.    
Guarantees Pledge of shares; assignment of receivables from energy sales from the project; assignment of machinery and equipment.    
Issue date Mar. 19, 2012    
Number of installments 192    
Final maturity Jun. 15, 2030    
Finance charges Monthly    
Contractual financial charges p.y. 2.34% above TJLP    
Effective interest rate p.y. 2.34% above TJLP    
Contract amount R$ 40,050    
Loans and financing R$ 30,598 33,385  
Local Currency [Member] | BNDES [Member] | 11211541 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 11211541    
Company GE S.B. do Norte    
Allocation Construction and implementation of wind generating plants.    
Guarantees Pledge of shares; assignment of receivables from energy sales from the project; assignment of machinery and equipment.    
Issue date Mar. 19, 2012    
Number of installments 192    
Final maturity Jun. 15, 2030    
Finance charges Monthly    
Contractual financial charges p.y. 2.34% above TJLP    
Effective interest rate p.y. 2.34% above TJLP    
Contract amount R$ 90,900    
Loans and financing R$ 69,394 75,715  
Local Currency [Member] | BNDES [Member] | 11211551 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 11211551    
Company GE Olho D'Água    
Allocation Construction and implementation of wind generating plants.    
Guarantees Pledge of shares; assignment of receivables from energy sales from the project; assignment of machinery and equipment.    
Issue date Mar. 19, 2012    
Number of installments 192    
Final maturity Jun. 15, 2030    
Finance charges Monthly    
Contractual financial charges p.y. 2.34% above TJLP    
Effective interest rate p.y. 2.34% above TJLP    
Contract amount R$ 97,000    
Loans and financing R$ 74,112 80,862  
Local Currency [Member] | BNDES [Member] | 18204611 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 18204611    
Company Cutia    
Allocation Construction and implementation of wind generating plants.    
Guarantees Pledge of shares; assignment of receivables.    
Issue date Oct. 25, 2018    
Number of installments 192    
Final maturity Jul. 15, 2035    
Finance charges Monthly    
Contractual financial charges p.y. 2.04% above TJLP    
Effective interest rate p.y. 8.37%    
Contract amount R$ 619,405    
Loans and financing R$ 611,457 517,083  
Local Currency [Member] | BNDES [Member] | 13212221 - A [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 13212221 - A    
Company Costa Oeste    
Allocation Implementation of transmission line between Cascavel Oeste and Umuarama Sul substations and implementation of Umuarama Sul substation.    
Guarantees Assignment of receivables; 100% of pledged shares.    
Issue date Dec. 03, 2013    
Number of installments 168    
Final maturity Nov. 30, 2028    
Finance charges Monthly    
Contractual financial charges p.y. 1.95% + TJLP    
Effective interest rate p.y. 1.95% + TJLP    
Contract amount R$ 27,634    
Loans and financing R$ 19,203 21,291  
Local Currency [Member] | BNDES [Member] | 13212221 - B [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 13212221 - B    
Company Costa Oeste    
Allocation Implementation of transmission line between Cascavel Oeste and Umuarama Sul substations and implementation of Umuarama Sul substation.    
Guarantees Assignment of receivables; 100% of pledged shares.    
Issue date Dec. 03, 2013    
Number of installments 106    
Final maturity Sep. 30, 2023    
Finance charges Monthly    
Contractual financial charges p.y. 3.5%    
Effective interest rate p.y. 3.5%    
Contract amount R$ 9,086    
Loans and financing R$ 2,992 3,789  
Local Currency [Member] | BNDES [Member] | 14205851 - A [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 14205851 - A    
Company Marumbi    
Allocation Implementation of transmission line between Curitiba and Curitiba Leste and implementation of Curitiba Leste substation.    
Guarantees Assignment of receivables; 100% of pledged shares.    
Issue date Jul. 08, 2014    
Number of installments 168    
Final maturity Jun. 30, 2029    
Finance charges Monthly    
Contractual financial charges p.y. 2.00% + TJLP    
Effective interest rate p.y. 2.00% + TJLP    
Contract amount R$ 33,460    
Loans and financing R$ 24,627 27,134  
Local Currency [Member] | BNDES [Member] | 14205851 - B [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 14205851 - B    
Company Marumbi    
Allocation Implementation of transmission line between Curitiba and Curitiba Leste and implementation of Curitiba Leste substation.    
Guarantees Assignment of receivables; 100% of pledged shares.    
Issue date Jul. 08, 2014    
Number of installments 106    
Final maturity Apr. 30, 2024    
Finance charges Monthly    
Contractual financial charges p.y. 6.00%    
Effective interest rate p.y. 6.00%    
Contract amount R$ 21,577    
Loans and financing 9,813 12,076  
Local Currency [Member] | Banco do Brasil BNDES Transfer [Member]      
Disclosure of detailed information about borrowings [line items]      
Loans and financing R$ 95,807 107,324  
Local Currency [Member] | Banco do Brasil BNDES Transfer [Member] | 21/02000-0 [Member]      
Disclosure of detailed information about borrowings [line items]      
Contract 21/02000-0    
Company Copel GeT    
Allocation Implementation of Mauá HPP.    
Guarantees Revenue from energy sales from the plant.    
Issue date Apr. 16, 2009    
Number of installments 179    
Final maturity Jan. 15, 2028    
Finance charges Monthly    
Contractual financial charges p.y. 2.13% above TJLP    
Effective interest rate p.y. 2.13% above TJLP    
Contract amount R$ 169,500    
Loans and financing R$ 95,807 R$ 107,324