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Consolidated Statements of Cash Flows - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
 CASH FLOWS FROM OPERATIONAL ACTIVITIES       
 Net income from continuing operations  R$ 3,859,045 R$ 3,834,172 R$ 2,171,262
 Net income (loss) from discontinued operations  1,189,557 75,578 (108,393)
 Net income  5,048,602 3,909,750 2,062,869
 Adjustments to reconcile net income for the period with cash       
 Unrealized monetary and exchange variation and debt charges - net  622,680 456,456 760,727
 Interest - bonus from the grant of concession agreements under the quota system  (134,482) (94,307) (91,404)
 Remuneration of transmission concession contracts  (1,084,986) (777,670) (501,566)
 Recovery of PIS / Pasep and Cofins on ICMS  (21,640) (1,755,112) (105,184)
 Income tax and social contribution  469,226 1,260,469 416,687
 Deferred income tax and social contribution  790,406 24,896 258,972
 Equity in earnings of investees  (303,137) (193,547) (106,757)
 Appropriation of post-employment benefits obligations  246,812 224,478 238,552
 Creation for research and development and energy efficiency programs  194,016 148,019 130,678
 Recognition of fair value  of assets related to concession compensation  (142,642) (57,341) (36,646)
 Sectorial financial assets and liabilities result  (2,502,324) (746,052) (25,057)
 Depreciation and amortization  1,082,539 1,009,912 950,726
 Net operating estimated losses, provisions and reversals  240,787 237,294 260,051
 Net hydrological risk renegotiation - GSF  (1,570,543)
 Result of business combination carried out with asset swap - gain  1,414
 Realization of added value in business combinations  (722) (722) 1,536
 Fair value in energy purchase and sale operations  35,818 (137,463) (204,876)
 Derivatives fair value  20,401 (24,511)
 Loss on disposal of accounts receivable related to concession 20 144 146
 Loss on disposal of contract assets  7,155 35,590 7,949
 Loss on disposal of property, plant and equipment  40,305 5,195 15,287
 Loss on disposal of intangible assets  30,623 52,811 26,368
 Result of write-offs of use rights of assets and liabilities of leases - net  (177) (314) (31)
 Net income for the period from discontinued operations  (1,189,557)
 Total 1,879,180 3,577,975 4,060,441
 Decrease (increase) in assets      
 Trade accounts receivable  (210,965) (175,049) 243,617
 Dividends and interest on own capital received   82,937 53,952 36,732
 CRC transferred to the Government of the State of Paraná  1,646,614 300,025 278,586
 Judicial deposits  (87,866) 16,729 45,482
 Sectorial financial assets  1,509,802 979,642 277,265
 Other receivables   (129,814) (13,898) (59,793)
 Inventories  (30,699) (40,035) (13,662)
 Income tax and social contribution  (267,179) 123,582 (37,226)
 Other current taxes recoverable  (64,130) 74,125 (20,350)
 Prepaid expenses  (16,621) (3,473) 10,450
 Related parties  (602)
 Total 2,432,079 1,315,600 760,499
 Increase (decrease) in liabilities       
 Payroll, social charges and accruals  17,224 347,002 52,792
 Suppliers  (53,298) 292,108 263,346
 Other taxes  834,358 (79,053) (132,423)
 Post-employment benefits  (198,626) (197,143) (199,007)
 Sectorial charges due  164,674 5,204 (51,442)
 Research and development and energy efficiency   (246,744) (153,729) (91,306)
 Payable related to the concession  (88,430) (74,931) (70,569)
 Other accounts payable  21,828 117,610 (51,095)
 Provisions for legal claims (207,877) (167,316) (366,066)
 Total 243,109 89,752 (645,770)
 CASH GENERATED BY OPERATING ACTIVITIES 4,554,368 4,983,327 4,175,170
 Income tax and social contribution paid  (659,318) (636,420) (560,692)
 Loans and financing - interest due and paid  (193,421) (183,391) (325,677)
 Debentures - interest due and paid  (343,903) (386,281) (664,247)
 Charges for lease liabilities paid  (6,514) (6,679) (8,356)
 CONTINUING OPERATIONS  3,351,212 3,770,556 2,616,198
 DISCONTINUED OPERATIONS  35,620 170,288 328,808
 NET CASH GENERATED FROM OPERATING ACTIVITIES 3,386,832 3,940,844 2,945,006
 CASH FLOWS FROM INVESTMENT ACTIVITIES       
 Financial investments   (54,120) (48,238) 45,170
 Additions to contract assets  (1,482,785) (1,236,999) (938,026)
 Acquisitions of subsidiaries - effect on cash  (501,886) (123,794)
 Additions in investments (30,970) (72,439) (133,874)
 Capital reduction of investees  228 35,035
 Additions to property, plant and equipment   (338,137) (226,325) (367,883)
 Additions to intangible assets  (4,546) (10,225) (4,711)
  FROM CONTINUING OPERATIONS  (2,412,444) (1,593,998) (1,488,083)
  FROM DISCONTINUED OPERATIONS  2,444,352 (73,573) (175,568)
 NET CASH GENERATED (USED) FROM INVESTING ACTIVITIES 31,908 (1,667,571) (1,663,651)
 CASH FLOWS FROM FINANCING ACTIVITIES       
 Loans and financing obtained from third parties 134,313 263,000 796,296
 Custos de transação na captação de empréstimos e financiamentos  (1,647)
 Issue of Debentures  3,000,000 2,755,028
 Custos de transação na emissão de debêntures  (35,030)
 Payments of principal - loans and financing (202,577) (248,863) (1,655,065)
 Payments of principal - debentures  (1,852,048) (1,036,490) (1,977,125)
 Amortization of principal of lease liabilities  (51,270) (46,365) (27,490)
 Dividends and interest on own capital paid  (3,874,318) (626,357) (380,421)
 NET CASH USED BY FINANCING ACTIVITIES FROM CONTINUING OPERATIONS  (2,882,577) (1,695,075) (488,777)
 NET CASH USED BY FINANCING ACTIVITIES FROM DISCONTINUED OPERATIONS  (1,850) (20,038) 200,740
 NET CASH USED FROM FINANCING ACTIVITIES  (2,884,427) (1,715,113) (288,037)
 TOTAL EFFECTS ON CASH AND CASH EQUIVALENTS  534,313 558,160 993,318
 Cash and cash equivalents at the beginning of the period  3,222,768 2,941,727 1,948,409
 Cash and cash equivalents at the end of the period  3,472,845 3,222,768 2,515,179
 Cash and cash equivalents variations from discontinued operations  284,236 277,119 426,548
 CHANGE IN CASH AND CASH EQUIVALENTS   R$ 534,313 R$ 558,160 R$ 993,318