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Consolidated Statements of Cash Flows - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
CASH FLOWS FROM OPERATIONAL ACTIVITIES      
Net income from continuing operations R$ 3,834,172    
Net income (loss) from discontinued operations 75,578    
NET INCOME 3,909,750    
Adjustments to reconcile net income for the period with cash      
Unrealized monetary and cambial variation and debt charges - net 456,456    
Interest - bonus from the grant of concession agreements under the quota system (94,307)    
Remuneration of transmission concession contracts (777,670)    
Recovery of PIS / Pasep and Cofins on ICMS (1,755,112)    
Income tax and social contribution 1,260,469    
Deferred income tax and social contribution 24,896    
Equity in earnings of investees (193,547)    
Appropriation of acturial calculation of post-employment benefits 94,349    
Appropriation of pension and healthcare contributions 130,129    
Creation for research and development and energy efficiency programs 148,019    
Recognition of fair value of assets related to concession compensation (57,341)    
Sectorial financial assets and liabilities result (746,052)    
Depreciation and amortization 1,009,912    
Net operating estimated losses, provisions and reversals 237,294    
Result of business combination carried out with asset swap - gain    
Realization of added value in business combinations (722)    
Result of disposal of investment    
Fair value in energy purchase and sale operations in the active market (137,463)    
Derivatives fair value (24,511)    
Loss on disposal of accounts receivable related to concession 144    
Loss on disposal of contract assets 35,590    
Loss on disposal of property, plant and equipment 5,195    
Loss on disposal of intangible assets 52,811    
Result of write-offs of use rights of assets and liabilities of leases - net (314)    
Total of adjustments to reconcile net income with cash generated from operating activities 3,577,975    
Decrease (increase) in assets      
Trade accounts receivable (175,049)    
Dividends and interest on own capital received 53,952    
CRC transferred to the Government of the State of Parana 300,025    
Judicial deposits 16,729    
Sectorial financial assets 979,642    
Other receivables (13,898)    
Inventories (40,035)    
Income tax and social contribution 123,582    
Other current taxes recoverable 74,125    
Prepaid expenses (3,473)    
Related parties    
Total decrease (increase) in assets 1,315,600    
Increase (decrease) in liabilities      
Payroll, social charges and accruals 347,002    
Related parties    
Suppliers 292,108    
Other taxes (79,053)    
Post-employment benefits (197,143)    
Sectorial charges due 5,204    
Research and development and energy efficiency (153,729)    
Payable related to the concession (74,931)    
Other accounts payable 117,610    
Provisions for legal claims (167,316)    
Total increase (decrease) in liabilities 89,752    
CASH GENERATED FROM OPERATING ACTIVITIES 4,983,327    
Income tax and social contribution paid (636,420)    
Loans and financing - interest due and paid (183,391)    
Debentures - interest due and paid (386,281)    
Charges for lease liabilities paid (6,679)    
NET CASH GENERATED BY OPERATING ACTIVITIES FROM CONTINUING OPERATIONS 3,770,556    
NET CASH GENERATED BY OPERATING ACTIVITIES FROM DISCONTINUED OPERATIONS 170,288    
NET CASH GENERATED FROM OPERATING ACTIVITIES 3,940,844    
CASH FLOWS FROM INVESTMENT ACTIVITIES      
Financial investments (48,238)    
Additions to contract assets (1,349,688)    
Customers contributions - contract assets 112,689    
Additions in investments (72,439)    
Capital reduction of investees 228    
Additions to property, plant and equipment (226,325)    
Additions to intangible assets (10,225)    
NET CASH USED BY INVESTMENT ACTIVITIES FROM CONTINUING OPERATIONS (1,593,998)    
NET CASH USED BY INVESTMENT ACTIVITIES FROM DISCONTINUED OPERATIONS (73,573)    
NET CASH (USED IN) GENERATED FROM INVESTING ACTIVITIES (1,667,571)    
CASH FLOWS FROM FINANCING ACTIVITIES      
Loans and financing obtained from third parties 263,000    
Payments of principal - loans and financing (248,863)    
Payments of principal - debentures (1,036,490)    
Amortization of principal of lease liabilities (46,365)    
Dividends and interest on own capital paid (626,357)    
NET CASH (USED) GENERATED BY FINANCING ACTIVITIES FROM CONTINUING OPERATIONS (1,695,075)    
NET CASH (USED) GENERATED BY FINANCING ACTIVITIES FROM DISCONTINUED OPERATIONS (20,038)    
NET CASH GENERATED FROM FINANCING ACTIVITIES (1,715,113)    
TOTAL EFFECTS ON CASH AND CASH EQUIVALENTS 558,160    
Cash and cash equivalents at the beginning of the period 2,941,727    
Cash and cash equivalents at the end of the period 3,222,768    
Cash and cash equivalents from discontinued operations 277,119    
CHANGE IN CASH AND CASH EQUIVALENTS R$ 558,160    
Restated [Member]      
CASH FLOWS FROM OPERATIONAL ACTIVITIES      
Net income from continuing operations   R$ 2,171,262 R$ 1,366,871
Net income (loss) from discontinued operations   (108,393) 77,133
NET INCOME   2,062,869 1,444,004
Adjustments to reconcile net income for the period with cash      
Unrealized monetary and cambial variation and debt charges - net   760,727 723,951
Interest - bonus from the grant of concession agreements under the quota system   (91,404) (85,986)
Remuneration of transmission concession contracts   (501,566) (351,544)
Recovery of PIS / Pasep and Cofins on ICMS   (105,184)
Income tax and social contribution   416,687 522,550
Deferred income tax and social contribution   258,972 (51,657)
Equity in earnings of investees   (106,757) (135,888)
Appropriation of acturial calculation of post-employment benefits   99,578 97,900
Appropriation of pension and healthcare contributions   138,974 151,215
Creation for research and development and energy efficiency programs   130,678 125,369
Recognition of fair value of assets related to concession compensation   (36,646) (47,499)
Sectorial financial assets and liabilities result   (25,057) (985,344)
Depreciation and amortization   950,726 696,933
Net operating estimated losses, provisions and reversals   260,051 281,104
Result of business combination carried out with asset swap - gain   1,414 3,769
Realization of added value in business combinations   1,536  
Result of disposal of investment   (8,174)
Fair value in energy purchase and sale operations in the active market   (204,876) (3,786)
Derivatives fair value  
Loss on disposal of accounts receivable related to concession   146 1,536
Loss on disposal of contract assets   7,949 9,762
Loss on disposal of property, plant and equipment   15,287 22,293
Loss on disposal of intangible assets   26,368 28,421
Result of write-offs of use rights of assets and liabilities of leases - net   (31)  
Total of adjustments to reconcile net income with cash generated from operating activities   4,060,441 2,438,929
Decrease (increase) in assets      
Trade accounts receivable   243,617 193,466
Dividends and interest on own capital received   36,732 50,858
CRC transferred to the Government of the State of Parana   278,586 260,117
Judicial deposits   45,482 89,527
Sectorial financial assets   277,265 482,974
Other receivables   (59,793) 21,556
Inventories   (13,662) (5,281)
Income tax and social contribution   (37,226) 360,714
Other current taxes recoverable   (20,350) (67,902)
Prepaid expenses   10,450 8,560
Related parties   (602)  
Total decrease (increase) in assets   760,499 1,394,589
Increase (decrease) in liabilities      
Payroll, social charges and accruals   52,792 (29,845)
Related parties   (59)
Suppliers   263,346 (575,722)
Other taxes   (132,423) 75,351
Post-employment benefits   (199,007) (204,809)
Sectorial charges due   (51,442) (70,507)
Research and development and energy efficiency   (91,306) (91,015)
Payable related to the concession   (70,569) (64,365)
Other accounts payable   (51,095) 103,198
Provisions for legal claims   (366,066) (143,864)
Total increase (decrease) in liabilities   (645,770) (1,001,637)
CASH GENERATED FROM OPERATING ACTIVITIES   4,175,170 2,831,881
Income tax and social contribution paid   (560,692) (411,037)
Loans and financing - interest due and paid   (325,677) (288,577)
Debentures - interest due and paid   (664,247) (475,547)
Charges for lease liabilities paid   (8,356)  
NET CASH GENERATED BY OPERATING ACTIVITIES FROM CONTINUING OPERATIONS   2,616,198 1,656,720
NET CASH GENERATED BY OPERATING ACTIVITIES FROM DISCONTINUED OPERATIONS   328,808 114,251
NET CASH GENERATED FROM OPERATING ACTIVITIES   2,945,006 1,770,971
CASH FLOWS FROM INVESTMENT ACTIVITIES      
Financial investments   45,170 (75,804)
Receipt of loans and financing granted to related parties     117,645
Additions to contract assets   (1,042,093) (792,835)
Customers contributions - contract assets   104,067 106,764
Acquisitions of subsidiaries - effect on cash   (123,794) 7,998
Additions in investments   (133,874) (51,557)
Capital reduction of investees   35,035 35,280
Additions to property, plant and equipment   (367,883) (1,208,953)
Customers contributions - property, plant and equipment     12
Additions to intangible assets   (4,711) (7,161)
NET CASH USED BY INVESTMENT ACTIVITIES FROM CONTINUING OPERATIONS   (1,488,083) (1,868,611)
NET CASH USED BY INVESTMENT ACTIVITIES FROM DISCONTINUED OPERATIONS   (175,568) (280,542)
NET CASH (USED IN) GENERATED FROM INVESTING ACTIVITIES   (1,663,651) (2,149,153)
CASH FLOWS FROM FINANCING ACTIVITIES      
Loans and financing obtained from third parties   796,296 1,314,766
Issue of Debentures   2,755,028 2,890,283
Payments of principal - loans and financing   (1,655,065) (1,120,340)
Payments of principal - debentures   (1,977,125) (1,491,667)
Amortization of principal of lease liabilities   (27,490)  
Dividends and interest on own capital paid   (380,421) (300,722)
NET CASH (USED) GENERATED BY FINANCING ACTIVITIES FROM CONTINUING OPERATIONS   (488,777) 1,292,320
NET CASH (USED) GENERATED BY FINANCING ACTIVITIES FROM DISCONTINUED OPERATIONS   200,740 (5,804)
NET CASH GENERATED FROM FINANCING ACTIVITIES   (288,037) 1,286,516
TOTAL EFFECTS ON CASH AND CASH EQUIVALENTS   993,318 908,334
Cash and cash equivalents at the beginning of the period   1,948,409 1,040,075
Cash and cash equivalents at the end of the period   2,515,179 1,929,201
Cash and cash equivalents from discontinued operations   426,548 19,208
CHANGE IN CASH AND CASH EQUIVALENTS   R$ 993,318 R$ 908,334