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35 Financial Instruments (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, book value R$ 11,853,814 R$ 10,696,367
Total financial assets, fair value 12,029,028  
Total financial liabilities, book value 18,139,625 15,065,586
Total financial liabilities, fair value 17,879,609  
Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, fair value   10,920,875
Total financial liabilities, fair value   15,026,969
Financial Liabilities at Amortised Cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, book value 17,796,219 14,812,410
Total financial liabilities, fair value 17,536,203  
Financial Liabilities at Amortised Cost [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, fair value   14,773,793
Financial liabilities at fair value through profit or loss, category [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, book value 343,406 253,176
Total financial liabilities, fair value 343,406  
Financial liabilities at fair value through profit or loss, category [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, fair value   253,176
Sectorial financial liabilities [member] | Financial Liabilities at Amortised Cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, book value [1] 188,709 102,284
Total financial liabilities, fair value [1] 188,709  
Sectorial financial liabilities [member] | Financial Liabilities at Amortised Cost [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, fair value   102,284
Ordinary Financing of Taxes With The Federal Tax Authorities [member] | Financial Liabilities at Amortised Cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, book value 18,063
Total financial liabilities, fair value  
Ordinary Financing of Taxes With The Federal Tax Authorities [member] | Financial Liabilities at Amortised Cost [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, fair value   18,001
Special Tax Regularization Program - Pert [member] | Financial Liabilities at Amortised Cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, book value [2] 459,303 497,207
Total financial liabilities, fair value [2] 377,375  
Special Tax Regularization Program - Pert [member] | Financial Liabilities at Amortised Cost [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, fair value   439,519
PIS and Cofins to be refunded to consumers [member] | Financial Liabilities at Amortised Cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, book value 3,927,823
Total financial liabilities, fair value 3,927,823  
PIS and Cofins to be refunded to consumers [member] | Financial Liabilities at Amortised Cost [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, fair value  
Accounts payable to suppliers [member] | Financial Liabilities at Amortised Cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, book value 2,436,452 1,873,193
Total financial liabilities, fair value 2,436,452  
Accounts payable to suppliers [member] | Financial Liabilities at Amortised Cost [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, fair value   1,873,193
Loans and Financing [member] | Financial Liabilities at Amortised Cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, book value [2] 3,214,249 3,168,710
Total financial liabilities, fair value [2] 2,956,696  
Loans and Financing [member] | Financial Liabilities at Amortised Cost [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, fair value   3,110,104
Debentures [member] | Financial Liabilities at Amortised Cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, book value [3] 6,837,819 8,540,366
Total financial liabilities, fair value [3] 6,837,819  
Debentures [member] | Financial Liabilities at Amortised Cost [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, fair value   8,540,366
Accounts payable related to concession [member] | Financial Liabilities at Amortised Cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, book value [4] 731,864 811,329
Total financial liabilities, fair value [4] 811,329  
Accounts payable related to concession [member] | Financial Liabilities at Amortised Cost [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, fair value   690,326
Derivatives fair value - forward contracts [member] | Level 3 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, book value [5] 1,203
Total financial liabilities, fair value [5]  
Derivatives fair value - forward contracts [member] | Level 3 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, fair value   1,203
Fair value in the purchase and sale of power [member] | Level 3 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, book value [5] 343,406 251,973
Total financial liabilities, fair value [5] 343,406  
Fair value in the purchase and sale of power [member] | Level 3 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial liabilities, fair value [5]   251,973
Fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, book value 5,489,658 4,942,562
Total financial assets, fair value 5,489,658  
Fair value through profit or loss [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, fair value   4,942,562
Fair value through profit or loss [member] | Cash and cash equivalents [member] | Level 1 of fair value hierarchy [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, book value [1] 3,222,768 2,941,727
Total financial assets, fair value 3,222,768  
Fair value through profit or loss [member] | Cash and cash equivalents [member] | Level 1 of fair value hierarchy [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, fair value   2,941,727
Fair value through profit or loss [member] | Bonds and securities [member] | Level 1 of fair value hierarchy [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, book value [6] 751 2,429
Total financial assets, fair value [6] 751  
Fair value through profit or loss [member] | Bonds and securities [member] | Level 1 of fair value hierarchy [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, fair value   2,429
Fair value through profit or loss [member] | Bonds and securities [member] | Level 2 of fair value hierarchy [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, book value [6] 299,779 279,652
Total financial assets, fair value [6] 299,779  
Fair value through profit or loss [member] | Bonds and securities [member] | Level 2 of fair value hierarchy [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, fair value   279,652
Fair value through profit or loss [member] | Accounts receivable related to the distribution concession [member] | Level 3 of fair value hierarchy [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, book value [7] 1,149,934 1,161,203
Total financial assets, fair value [7] 1,149,934  
Fair value through profit or loss [member] | Accounts receivable related to the distribution concession [member] | Level 3 of fair value hierarchy [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, fair value   1,161,203
Fair value through profit or loss [member] | Accounts receivable related to the generation concession [member] | Level 3 of fair value hierarchy [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, book value [8] 81,202 69,182
Total financial assets, fair value [8] 81,202  
Fair value through profit or loss [member] | Accounts receivable related to the generation concession [member] | Level 3 of fair value hierarchy [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, fair value   69,182
Fair value through profit or loss [member] | Derivatives fair value - forward contracts [member] | Level 3 of fair value hierarchy [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, book value [5] 23,308
Total financial assets, fair value [5] 23,308  
Fair value through profit or loss [member] | Derivatives fair value - forward contracts [member] | Level 3 of fair value hierarchy [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, fair value   1,203
Fair value through profit or loss [member] | Fair value in the purchase and sale of power in the active market [member] | Level 3 of fair value hierarchy [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, book value [5] 689,531 460,635
Total financial assets, fair value [5] 689,531  
Fair value through profit or loss [member] | Fair value in the purchase and sale of power in the active market [member] | Level 3 of fair value hierarchy [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, fair value   460,635
Fair value through profit or loss [member] | Other temporary investments [member] | Level 1 of fair value hierarchy [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, book value [9] 14,910 15,566
Total financial assets, fair value [9] 14,910  
Fair value through profit or loss [member] | Other temporary investments [member] | Level 1 of fair value hierarchy [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, fair value   15,566
Fair value through profit or loss [member] | Other Temporary Investments [member] | Level 2 of fair value hierarchy [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, book value [9] 7,475 12,168
Total financial assets, fair value [9] 7,475  
Fair value through profit or loss [member] | Other Temporary Investments [member] | Level 2 of fair value hierarchy [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, fair value   12,168
Financial Assets at Amortised Cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, book value 6,364,156 5,753,805
Total financial assets, fair value 6,539,370  
Financial Assets at Amortised Cost [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, fair value   5,978,313
Financial Assets at Amortised Cost [member] | Collaterals And Escrow Accounts [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, book value [1] 197 147
Total financial assets, fair value [1] 197  
Financial Assets at Amortised Cost [member] | Collaterals And Escrow Accounts [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, fair value   147
Financial Assets at Amortised Cost [member] | Collaterals And Escrow Accounts [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, book value 133,521 98,433 [2]
Total financial assets, fair value 113,477  
Financial Assets at Amortised Cost [member] | Collaterals And Escrow Accounts [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, fair value   94,671
Financial Assets at Amortised Cost [member] | Trade accounts receivable [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, book value [1] 3,819,680 3,182,567
Total financial assets, fair value [1] 3,819,680  
Financial Assets at Amortised Cost [member] | Trade accounts receivable [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, fair value   3,182,567
Financial Assets at Amortised Cost [member] | CRC transferred to the parana state government [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, book value [10] 1,392,624 1,350,685
Total financial assets, fair value [10] 1,496,016  
Financial Assets at Amortised Cost [member] | CRC transferred to the parana state government [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, fair value   1,488,456
Financial Assets at Amortised Cost [member] | Sectorial financial assets [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, book value [1] 346,930 473,989
Total financial assets, fair value [1] 346,930  
Financial Assets at Amortised Cost [member] | Sectorial financial assets [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, fair value   473,989
Financial Assets at Amortised Cost [member] | Accounts receivable - concessions - bonus from the grant [member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, book value [11] 671,204 647,984
Total financial assets, fair value [11] R$ 763,070  
Financial Assets at Amortised Cost [member] | Accounts receivable - concessions - bonus from the grant [member] | Restated [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets, fair value   R$ 738,483
[1] Equivalent to their respective carrying values due to their nature and terms of realization.
[2] The cost of the last borrowing taken out by the Company is used as a basic assumption IPCA + Spread de 4.8165%, for discount of the expected payment flows.
[3] Calculated from the Unit Price quotation (PU) for December 31, 2020, obtained from the Brazilian Association of Financial and Capital Markets (ANBIMA), net of unamortized financial cost.
[4] Actual net discount rate of 8.64% p.a., in line with the Company's estimated rate for long-term projects.
[5] The fair values of assets and liabilities are equivalent to their carrying amounts according to Note 4.15 of these Financial Statements.
[6] Fair value is calculated based on information made available by the financial agents and the market values of the bonds issued by the Brazilian government
[7] The criteria are disclosed in Note 4.4 to the financial statements.
[8] The fair values of generation assets approximate their carrying amounts, according to Note 4.4 of these Financial Statements.
[9] Investments in other companies, stated at fair value, which is calculated according to the price quotations published in an active market, for assets classified as level 1 and determined in view of the comparative assessment model for assets classified as level 2.
[10] The Company based its calculation on the comparison with a long-term and post-fixed National Treasury Bond (NTN-B) maturing on August 15, 2026, which yields approximately 3.09% p.a. plus the IPCA inflation index.
[11] Receivables related to the concession agreement for providing electricity generation services under quota arrangements, having their fair value calculated by expected cash inflows, discounted at the rate established by ANEEL auction notice 12/2015 (9.04%).