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CONSOLIDATED STATEMENT OF CASH FLOWS - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
CASH FLOW FROM OPERATIONS      
Net income for the year R$ 5,767 R$ 4,094 R$ 3,753
Adjustments to reconcile net income to net cash flows:      
Deferred income tax and social contribution tax 1,084 26 (210)
Depreciation and amortization 1,274 1,182 1,049
Loss on write-off of net residual value of unrecoverable concession financial assets, concessional contract asset, PP&E and Intangible assets 97 74 47
Fair value adjustment of financial assets   172  
Renegotiation of hydrological risk costs (Law 14,052/20), net   (1,032)
Write off related to contractual securities (8) 1 11
Bargain purchase   (5) (4)
Discount and premium on repurchase of debt securities   47 491
Share of loss (gain), net, of subsidiaries and joint ventures (432) (843) (182)
Remeasuring of concession financial and concession contract assets (1,246) (1,245) (1,306)
Periodic Tariff Review adjustments     (237)
Interest and monetary variation 676 493 1,381
Exchange variation on loans, financing and debentures (277) (338) 353
Reimbursement of PIS/Pasep and Cofins over ICMS credits to customers -Realization (1,909) (2,360) (1,317)
Gain on sale of non-current asset held for sale (319) (52) (109)
Transaction costs 14 7 20
Expected credit losses 175 109 144
Provision for contingencies 360 342 375
Other provisions 59 (18)  
Net gain on derivative instruments at fair value through profit or loss 177 438 538
CVA (Parcel A items Compensation) Account and Other financial components in tariff adjustments 213 1,147 (2,146)
Post-employment obligations 611 666 86
Other (46) 130 (24)
Total  6,270 4,067 1,537
Increase (decrease) in assets      
Receivables from customers (839) (440) (90)
CVA and Other financial components in tariff adjustments   191 15
Recoverable taxes 175 2,490 1,668
Income tax and social contribution tax credits 6 149 (555)
Escrow deposits 45 31 (70)
Dividends received from investees 592 708 499
Contractual assets and concession financial assets 905 620 713
Other 154 87 (267)
Total (increase) / decrease in assets  1,038 3,836 1,913
Increase (decrease) in liabilities      
Suppliers 185 149 325
Taxes payable 778 408 5
Income tax and social contribution tax payable 50 1,206
Payroll and related charges (21) 35 12
Regulatory charges 2 (240) 78
Post-employment obligations (535) (482) (422)
PIS/Pasep and Cofins over ICMS credits to customers 249 219
Other (40) (200) 101
Total increase (decrease) in liabilities  618 (61) 1,305
Cash generated by operating activities 7,926 7,842 4,755
Interest received 328 291  
Interest paid on loans, financing and debentures (1,026) (1,010) (1,589)
Interest paid on lease contracts (5) (4) (3)
Income tax and social contribution tax paid (601) (704) (500)
Cash inflows from settlement of derivatives instruments 24 129 1,022
NET CASH FLOWS FROM OPERATING ACTIVITIES 6,646 6,544 3,685
INVESTING ACTIVITIES      
Investments in marketable securities (11,238) (14,152) 0
Redemptions in marketable securities 12,360 14,420 2,047
Restricted cash     43
Acquisition of equity investees (37) (52) (56)
Arising from the sale of equity interest, net of costs of sales 669 52 1,367
Settlement of put option (780)    
Acquisition of property, plant and equipment (1,076) (173) (182)
Acquisition of intangible assets (188)
Contract assets - distribution of gas and energy infrastructure (3,679) (3,112) (1,798)
NET CASH PROVIDE BY/ USED IN INVESTING ACTIVITIES (3,969) (3,136) (1,370)
FINANCING ACTIVITIES      
Proceeds from loans and debentures 1,988 1,981 13
Interest on capital and dividends paid (1,823) (2,094) (1,416)
Payment of loans and debentures (2,679) (2,613) (4,437)
Leasing liabilities paid (67) (66) (70)
NET CASH FLOWS USED IN FINANCING ACTIVITIES (2,581) (2,792) (5,910)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS FOR THE YEAR 96 616 (855)
Cash and cash equivalents at the beginning of the year 1,441 825 1,680
Cash and cash equivalents at the end of the year R$ 1,537 R$ 1,441 R$ 825