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Consolidated Statements of Cash Flows - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
 CASH FLOWS FROM OPERATIONAL ACTIVITIES       
 Net income from continuing operations  R$ 2,135,667 R$ 1,223,987 R$ 3,401,901
 Adjustments to reconcile net income for the period with cash generation from operating activities:       
 Unrealized monetary and exchange variation and debt charges - net  1,951,552 1,298,681 597,769
 Interest - bonus from the grant of concession agreements under the quota system  (114,370) (118,439) (134,482)
 Remuneration of transmission concession contracts  (730,094) (769,248) (1,084,986)
 Provision for allocation of PIS and Cofins credits  1,821,933
 Income tax and social contribution  371,104 368,035 566,272
 Deferred income tax and social contribution  (17,047) (649,134) 806,344
 Equity in earnings of investees  (307,809) (478,577) (303,137)
 Appropriation of post-employment benefits obligations  267,741 266,273 245,360
 Creation for research and development and energy efficiency programs  165,459 155,705 171,601
 Recognition of fair value of assets from the indemnity for the concession  (62,167) (79,169) (108,733)
 Sectorial financial assets and liabilities result  (1,070,196) (1,847,863) (2,502,324)
 Depreciation and amortization  1,382,040 1,233,097 1,017,293
 Provision arising from the voluntary dismissal program  610,057
 Net operating estimated losses, provisions and reversals  92,235 717,531 366,332
 Realization of added value in business combinations  (722) (721) (722)
 Fair value in energy purchase and sale operations  (5,045) (32,748) 35,818
 Derivatives fair value  2,907 20,401
 Loss on disposal of accounts receivable related to concession 270 26,533 13
 Loss on disposal of contract assets  16,728 8,829 7,155
 Loss on disposal of property, plant and equipment  10,458 7,850 11,031
 Loss on disposal of intangible assets  78,728 55,053 30,623
 Result of write-offs of use rights of assets and liabilities of leases - net  726 (146) (177)
Total  4,775,315 3,210,369 1,572,809
 Decrease (increase) in assets      
 Trade accounts receivable  188,437 1,482,232 (321,663)
 Dividends and interest on own capital received   174,826 67,732 82,937
 CRC transferred to the Government of the State of Paraná  1,646,614
 Judicial deposits  33,298 1,521 (87,785)
 Sectorial financial assets  36,964 966,466 1,509,802
 Other receivables   (11,555) 69,208 (179,301)
 Inventories  18,741 7,326 (30,334)
 Income tax and social contribution recoverable  (201,003) (488,495) (259,807)
 Other taxes recoverable  (138,520) 236,843 (72,431)
 Prepaid expenses  (2,281) (6,585) (16,178)
 Related parties  (201) (1,135)
Total decrease (increase) in assets   98,706 2,335,113 2,271,854
 Increase (decrease) in liabilities       
 Payroll, social charges and accruals  297,343 (191,643) 16,713
 Suppliers  19,506 (347,157) (12,227)
 Other taxes  974,083 884,140 834,634
 Post-employment benefits  (224,809) (200,697) (198,090)
 Sectorial charges due  14,978 (151,898) 164,674
 Research and development and energy efficiency   (255,295) (202,073) (230,328)
 Payable related to the concession  (115,736) (106,370) (88,430)
 Other accounts payable  149,450 106,269 22,278
 Provisions for legal claims (372,838) (239,741) (207,720)
Total increase (decrease) in liabilities  486,682 (449,170) 301,504
 CASH GENERATED BY OPERATING ACTIVITIES 5,360,703 5,096,312 4,146,167
 Income tax and social contribution paid  (294,676) (124,381) (745,150)
 Loans and financing - interest due and paid  (521,134) (337,455) (193,421)
 Debentures - interest due and paid  (1,127,607) (890,123) (343,524)
 Charges for lease liabilities paid  (24,284) (19,531) (5,135)
 NET CASH GENERATED BY OPERATING ACTIVITIES FROM  CONTINUING OPERATIONS 3,393,002 3,724,822 2,858,937
 NET CASH GENERATED BY OPERATING ACTIVITIES FROM  DISCONTINUED OPERATIONS  125,474 177,827 527,895
 NET CASH GENERATED FROM OPERATING ACTIVITIES 3,518,476 3,902,649 3,386,832
 CASH FLOWS FROM INVESTMENT ACTIVITIES       
 Financial investments   (44,061) 44,190 (39,274)
 Additions to contract assets  (1,973,215) (1,909,603) (1,468,516)
 Acquisitions of subsidiaries - effect on cash  (911,450) (18,031) (501,886)
 Investment disposal - advance  58,132
 Additions in investments (10,780) (4,829) (30,970)
 Capital reduction of investees  61,536
 Additions to property, plant and equipment   (204,805) (381,938) (338,129)
 Additions to intangible assets  (13,388) (8,319) (4,546)
 NET CASH USED BY INVESTMENT ACTIVITIES  FROM CONTINUING OPERATIONS  (3,099,567) (2,216,994) (2,383,321)
 NET CASH USED BY INVESTMENT ACTIVITIES  FROM DISCONTINUED OPERATIONS  (35,524) (558,002) 2,415,229
 NET CASH USED FROM INVESTING ACTIVITIES (3,135,091) (2,774,996) 31,908
 CASH FLOWS FROM FINANCING ACTIVITIES       
 Loans and financing obtained from third parties 45,325 1,891,954 134,313
 Transaction costs of loans and financing obtained from third parties (6,886) (19,781) (1,647)
 Issue of debentures  2,900,000 1,500,000 3,000,000
 Transaction costs in the issuing of debentures  (60,677) (14,445) (35,030)
 Payments of principal - loans and financing (260,971) (1,000,319) (202,577)
 Payments of principal - debentures  (1,193,910) (2,051,481) (1,831,809)
 Amortization of principal of lease liabilities  (69,293) (57,212) (48,785)
 Capital increase  2,031,619
 Transaction costs in capital increase  (14,941)
 Dividends and interest on own capital paid  (750,371) (2,167,769) (3,847,563)
 NET CASH GENERATED (USED) BY FINANCING ACTIVITIES FROM CONTINUING OPERATIONS  2,619,895 (1,919,053) (2,833,098)
 NET CASH GENERATED (USED) BY FINANCING ACTIVITIES FROM DISCONTINUED OPERATIONS  76,677 (2,988) (51,329)
 NET CASH GENERATED (USED) FROM FINANCING ACTIVITIES  2,696,572 (1,922,041) (2,884,427)
 TOTAL EFFECTS ON CASH AND CASH EQUIVALENTS  3,079,957 (794,388) 534,313
 Cash and cash equivalents at the beginning of the period  2,678,457 3,472,845 3,222,768
 Cash and cash equivalents at the end of the period  5,634,623 2,552,407 3,167,940
 Cash and cash equivalents variations from discontinued operations  123,791 126,050 589,141
 CHANGE IN CASH AND CASH EQUIVALENTS   R$ 3,079,957 R$ (794,388) R$ 534,313