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Consolidated Statements of Cash Flows - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
CASH FLOWS FROM OPERATIONAL ACTIVITIES      
Net income R$ 2,062,869 R$ 1,444,004 R$ 1,118,255
Adjustments to reconcile net income for the period with cash      
Unrealized monetary and cambial variation and debt charges - net 815,061 767,751 900,610
Interest - bonus from the grant of concession agreements under the quota system (91,404) (85,986) (82,160)
Remuneration of transmission concession contracts (501,566) (351,544) (490,925)
Result of the adoption of the Special Tax Regularization Program     (154,197)
Recovery of PIS / Pasep and Cofins on ICMS (105,184)    
Income tax and social contribution 433,555 580,065 379,943
Deferred income tax and social contribution 205,771 (68,072) (105,257)
Equity in earnings of investees (106,757) (135,888) (101,739)
Appropriation of acturial calculation of post-employment benefits 99,578 97,900 97,511
Appropriation of pension and healthcare contributions 138,974 151,215 153,069
Creation for research and development and energy efficiency programs 130,678 125,369 118,753
Recognition of fair value of assets related to concession compensation (36,646) (47,499) (57,080)
Sectorial financial assets and liabilities result (25,057) (985,344) (767,040)
Depreciation and amortization 1,093,836 749,179 731,599
Net operating estimated losses, provisions and reversals 374,815 306,697 365,539
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) (28,650)
Fair value in energy purchase and sale operations in the active market (204,876) (3,786)  
Impairment of accounts receivable related to concession 146 1,536 17
Loss on disposal of contract assets 7,949 9,762  
Loss on disposal of property, plant and equipment 158,084 68,450 64,508
Loss on disposal of intangible assets 26,789 28,742 42,740
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 4,479,534 2,648,146 2,185,496
Decrease (increase) in assets      
Trade accounts receivable 225,624 191,113 (322,814)
Dividends and interest on own capital received 36,732 50,858 44,334
CRC transferred to the Government of the State of Parana 278,586 260,117 97,085
Judicial deposits 46,300 87,853 96,028
Sectorial financial assets 277,265 482,974  
Other receivables (55,191) 17,292 (44,193)
Inventories (14,220) (5,726) 20,078
Income tax and social contribution (60,904) 360,855 146,602
Other current taxes recoverable (13,338) (74,003) 87,884
Prepaid expenses 10,414 8,520 12,128
Related parties     (667)
Total decrease (increase) in assets 731,268 1,379,853 136,465
Increase (decrease) in liabilities      
Payroll, social charges and accruals 52,792 (29,845) 26,170
Related parties   (59)  
Suppliers 255,534 (572,306) 275,370
Other taxes (132,330) 75,234 24,795
Post-employment benefits (199,007) (204,809) (200,848)
Sectorial charges due (51,442) (70,507) 8,313
Research and development and energy efficiency (91,306) (91,015) (104,512)
Payable related to the concession (70,569) (64,365) (65,871)
Accounts payable linked to the concession     419,220
Other accounts payable (51,484) 103,464 (101,062)
Provisions for legal claims (367,548) (144,171) (124,395)
Total increase (decrease) in liabilities (655,360) (998,379) 157,180
CASH GENERATED FROM OPERATING ACTIVITIES 4,555,442 3,029,620 2,479,141
Income tax and social contribution paid (575,210) (468,552) (335,087)
Loans and financing - interest due and paid (325,977) (289,095) (532,033)
Debentures - interest due and paid (700,119) (501,002) (622,815)
Charges for lease liabilities paid (9,130)    
NET CASH GENERATED FROM OPERATING ACTIVITIES 2,945,006 1,770,971 989,206
CASH FLOWS FROM INVESTMENT ACTIVITIES      
Financial investments 45,170 (75,804) 48,512
Loans and financing granted to related parties     (5,145)
Receipt of loans and financing granted to related parties   117,645 24,985
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  
Investment disposal     484,608
Additions in investments (133,874) (51,557) (248,243)
Capital reduction of investees 35,035 35,280  
Additions to property, plant and equipment (543,130) (1,489,067) (1,205,508)
Customers contributions - property, plant and equipment   12  
Additions to intangible assets (5,032) (7,589) (806,240)
Customers contributions - intangible assets     125,858
NET CASH (USED IN) GENERATED FROM INVESTING ACTIVITIES (1,663,651) (2,149,153) (1,581,173)
CASH FLOWS FROM FINANCING ACTIVITIES      
Loans and financing obtained from third parties 796,296 1,314,766 800,044
Issue of Debentures 2,965,028 2,890,283 2,242,521
Payments of principal - loans and financing (1,660,869) (1,126,144) (971,187)
Payments of principal - debentures (1,977,125) (1,491,667) (915,005)
Amortization of principal of lease liabilities (30,946)    
Dividends and interest on own capital paid (380,421) (300,722) (506,404)
NET CASH GENERATED FROM FINANCING ACTIVITIES (288,037) 1,286,516 649,969
TOTAL EFFECTS ON CASH AND CASH EQUIVALENTS 993,318 908,334 58,002
Cash and cash equivalents at the beginning of the period 1,948,409 1,040,075 982,073
Cash and cash equivalents at the end of the period 2,941,727 1,948,409 1,040,075
CHANGE IN CASH AND CASH EQUIVALENTS R$ 993,318 R$ 908,334 R$ 58,002