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CONSOLIDATED STATEMENT OF CASH FLOWS - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
OPERATIONAL ACTIVITIES      
Income before income tax and social contribution R$ 10,620,784 R$ 1,396,363 R$ 4,333,995
Adjustments to reconcile profit with cash generated by operations:      
Depreciation and amortization 3,987,775 3,621,342 2,690,269
Net exchange and monetary changes 3,363,144 3,342,161 650,770
Financial charges 5,865,332 6,095,390 4,980,707
Result of equity method investments (2,503,207) (2,062,090) (2,369,777)
Other income and expenditure (136,540) (651,280) (186,924)
Transmission revenues (19,292,579) (17,432,037) (15,774,884)
Construction cost - transmission 4,286,914 3,291,132 1,671,307
Regulatory remeasurements - Transmission contracts (6,129,771) 12,144 (365,178)
Operating provisions (reversals) (180,019) 2,481,054 6,928,425
Fixed and intangible asset write off 157,248 632,441 440,775
Income from hedging and derivatives 1,940,087 1,521,637 356,494
Others 894,482 637,869 1,310,565
Adjustments to reconcile profit with cash generated by operations (7,747,134) 1,489,763 332,549
(Accruals) / decreases in operating assets      
Accounts Receivable, net 1,111,674 (927,096) (408,364)
Marketable securities, net     (1,499,907)
Reimbursement right 752,350 473,496 1,036,409
Others 673,834 109,683 (436,278)
(Accruals) / decreases in operating assets 2,537,858 (343,917) (1,308,140)
Increases / (decreases) in operating liabilities      
Suppliers (614,240) (526,425) 233,911
Advances   (162,275) 104,964
Payroll (775,899) (813,498) 222,345
Regulatory fees 365,508 (280,680) 159,695
Others (605,675) 217,985 (382,451)
Increases / (decreases) in operating liabilities (1,630,306) (1,564,893) 338,464
Payment of interests (6,650,869) (5,512,449) (3,211,343)
Receipt of allowed annual revenue - RAP 19,248,186 18,287,910 14,623,582
Receipt of dividends and interest on equity 1,506,336 1,329,703 1,494,560
Payment of judicial contingencies (3,776,063) (2,672,962) (4,222,504)
Securities and restricted deposits 195,871 (733,354) (1,199,426)
Payment of income tax and social contribution (1,488,382) (2,930,778) (2,607,461)
Supplementary social security (430,698) (510,048) (469,943)
Net cash from operating activities of continuing operations 12,385,583 8,235,338 8,104,333
Net cash (used in) operating activities of discontinued operations     (2,908,844)
Net cash of operating activities 12,385,583 8,235,338 5,195,489
FINANCING ACTIVITIES      
Receipt for issuing shares     30,648,282
Loans and financing obtained and debentures obtained 29,965,839 11,821,045 8,500,000
Payment of loans and financing and debentures - principal (16,009,832) (13,763,329) (6,734,696)
Payment of dividends and interest on equity (1,307,858) (864,192) (1,490,058)
Payment to dissident shareholders - merge of shares   (226,057)  
Repurchase of shares (115,099) (1,967,218)  
Payment of obligations with CDE and revitalization of basins - principal (1,974,965) (1,433,816)  
Payment of leases - principal (757,196) (765,525) (721,074)
Others   443,961 44,746
Net cash from (used in) financing activities of continuing operations 9,800,889 (6,755,131) 30,247,200
Net cash from (used in) financing activities of discontinued operations     (174,814)
Net cash from (used in) financing activities 9,800,889 (6,755,131) 30,072,386
INVESTING ACTIVITIES      
Acquisition of debentures   (450,000)  
Receipt of loans and financing 12,675 982,425 2,358,352
Marketable Securities, net (3,064,434) 3,143,232  
Interest Received - Marketable Securities 529,802 4,066,478 3,763,966
Receipt of financial charges 57,665 172,457 316,278
Acquisition of property, plant and equipment (3,099,474) (3,862,770) (1,585,639)
Acquisition of intangible assets (425,891) (258,371) (32,038,772)
Transmission infrastructure - contractual assets (4,286,914) (3,269,358) (1,652,992)
Acquisition / capital injection in shareholdings, net of cash acquired (176,643) (1,439,478) (74,307)
Disposal of investments in shareholdings 2,449,160 907,004 1,169,784
Others (656,267) (116,617) (57,832)
Net cash (used in) investing activities of continuing operations (8,660,321) (124,998) (27,801,162)
Net cash from (used in) investing activities of discontinued operations   952,036 3,079,754
Net cash provided by (used in) investing activities (8,660,321) 827,038 (24,721,408)
Increase in cash and cash equivalents 13,526,151 2,307,245 10,546,467
Cash and cash equivalents at the beginning of the fiscal year 13,046,371 10,739,126  
Cash and cash equivalents at the end of the year R$ 26,572,522 13,046,371 10,739,126
Increase (decrease) in cash and cash equivalents from discontinued operations   R$ 952,036 R$ (3,904)