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Consolidated Statements of Cash Flows - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash flows from (used in) operating activities [abstract]      
Net income R$ 2,307,799 R$ 2,135,667 R$ 1,223,987
Adjustments to reconcile net income for the period with cash generation from operating activities:      
Unrealized monetary and exchange variation and debt charges – net 2,071,041 1,951,552 1,298,681
 Interest - bonus from the grant of concession agreements under the quota system  (120,800) (114,370) (118,439)
 Remuneration of transmission concession contracts  (833,630) (730,094) (769,248)
 Provision for allocation of PIS and Cofins credits  0 0 1,821,933
Income tax and social contribution 177,999 371,104 368,035
 Deferred income tax and social contribution  421,436 (17,047) (649,134)
 Equity in earnings of investees  (281,202) (307,809) (478,577)
Appropriation of post-employment benefits obligations 257,711 267,741 266,273
 Creation for research and development and energy efficiency programs  181,675 165,459 155,705
 Recognition of fair value of assets from the indemnity for the concession  (82,424) (62,167) (79,169)
 Sectorial financial assets and liabilities result  (923,724) (1,070,196) (1,847,863)
Depreciation and amortization 1,465,478 1,382,040 1,233,097
 Provision arising from the voluntary dismissal program  18,306 610,057 0
Long-Term Incentive Plan - ILP 5,595 0 0
Net operating estimated losses, provisions and reversals 345,102 92,235 717,531
 Realization of added value in business combinations  (722) (722) (721)
 Fair value in energy purchase and sale operations  36,604 (5,045) (32,748)
 Derivatives fair value  0 0 2,907
Loss on disposal of accounts receivable related to concession 3,265 270 26,533
 Loss on disposal of contract assets  14,496 16,728 8,829
 Loss on disposal of property, plant and equipment  32,234 10,458 7,850
 Loss on disposal of intangible assets  76,183 78,728 55,053
 Result of write-offs of use rights of assets and liabilities of leases - net  (4,774) 726 (146)
Result on the sale of properties (264,434) 0 0
Total  4,903,214 4,775,315 3,210,369
 Decrease (increase) in assets      
 Trade accounts receivable  602,196 188,437 1,482,232
Dividends and interest on own capital received 223,985 174,826 67,732
Judicial deposits 18,427 33,298 1,521
 Sectorial financial assets  354,421 36,964 966,466
Other receivables (73,515) (11,555) 69,208
 Inventories  38,402 18,741 7,326
Income tax and social contribution recoverable (295,650) (201,003) (488,495)
 Other taxes recoverable  (50,731) (138,520) 236,843
 Prepaid expenses  (342) (2,281) (6,585)
 Related parties  715 (201) (1,135)
Total decrease (increase) in assets   817,908 98,706 2,335,113
 Increase (decrease) in liabilities       
 Payroll, social charges and accruals  (313,552) 297,343 (191,643)
 Suppliers  72,730 19,506 (347,157)
 Other taxes  882,575 974,083 884,140
Post-employment benefits (219,780) (224,809) (200,697)
 Sectorial charges due  (16,641) 14,978 (151,898)
 Research and development and energy efficiency   (336,956) (255,295) (202,073)
Payable related to the concession (110,385) (115,736) (106,370)
 Other accounts payable  (131,259) 149,450 106,269
Provisions for legal claims (345,138) (372,838) (239,741)
Total increase (decrease) in liabilities  (518,406) 486,682 (449,170)
 CASH GENERATED BY OPERATING ACTIVITIES 5,202,716 5,360,703 5,096,312
 Income tax and social contribution paid  (219,219) (294,676) (124,381)
 Loans and financing - interest due and paid  (471,276) (521,134) (337,455)
Debentures - interest due and paid (1,089,013) (1,127,607) (890,123)
 Charges for lease liabilities paid  (33,292) (24,284) (19,531)
 NET CASH GENERATED BY OPERATING ACTIVITIES FROM  CONTINUING OPERATIONS 3,389,916 3,393,002 3,724,822
 NET CASH GENERATED BY OPERATING ACTIVITIES FROM  DISCONTINUED OPERATIONS  3,620 125,474 177,827
 NET CASH GENERATED FROM OPERATING ACTIVITIES 3,393,536 3,518,476 3,902,649
 CASH FLOWS FROM INVESTMENT ACTIVITIES       
 Financial investments   (32,939) (44,061) 44,190
 Additions to contract assets  (2,174,902) (1,973,215) (1,909,603)
 Acquisitions of subsidiaries - effect on cash  0 (911,450) (18,031)
Investment disposal 47,066 58,132 0
 Additions in investments 0 (10,780) (4,829)
 Capital reduction of investees  37,129 0 61,536
 Additions to property, plant and equipment   (137,635) (204,805) (381,938)
Gains (losses) on disposals of property, plant and equipment 11,440 0 0
 Additions to intangible assets  (4,098,286) (13,388) (8,319)
 NET CASH USED BY INVESTMENT ACTIVITIES  FROM CONTINUING OPERATIONS  (6,348,127) (3,099,567) (2,216,994)
 NET CASH USED BY INVESTMENT ACTIVITIES  FROM DISCONTINUED OPERATIONS  608,713 (35,524) (558,002)
Cash flows from (used in) investing activities (5,739,414) (3,135,091) (2,774,996)
Cash flows from (used in) financing activities [abstract]      
 Loans and financing obtained from third parties 5,051 45,325 1,891,954
 Transaction costs of loans and financing obtained from third parties (1,693) (6,886) (19,781)
 Issue of debentures  3,920,000 2,900,000 1,500,000
 Transaction costs in the issuing of debentures  (60,623) (60,677) (14,445)
 Payments of principal - loans and financing (261,753) (260,971) (1,000,319)
Payments of principal - debentures (1,079,912) (1,193,910) (2,051,481)
 Amortization of principal of lease liabilities  (70,949) (69,293) (57,212)
 Capital increase  0 2,031,619 0
 Transaction costs in capital increase  0 (14,941) 0
Share buyback (50,044) 0 0
 Dividends and interest on own capital paid  (1,586,565) (750,371) (2,167,769)
 NET CASH GENERATED (USED) BY FINANCING ACTIVITIES FROM CONTINUING OPERATIONS  813,512 2,619,895 (1,919,053)
 NET CASH GENERATED (USED) BY FINANCING ACTIVITIES FROM DISCONTINUED OPERATIONS  (9,656) 76,677 (2,988)
 NET CASH GENERATED (USED) FROM FINANCING ACTIVITIES  803,856 2,696,572 (1,922,041)
 Cash and cash equivalents at the beginning of the period  5,634,623 2,678,457 3,472,845
 Cash and cash equivalents at the end of the period  4,161,939 5,634,623 2,552,407
 Cash and cash equivalents variations from discontinued operations  (69,338) 123,791 126,050
Increase (decrease) in cash and cash equivalents after effect of exchange rate changes R$ (1,542,022) R$ 3,079,957 R$ (794,388)