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CONSOLIDATED STATEMENT OF CASH FLOWS - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
CASH FLOW FROM OPERATIONS      
Net income for the year R$ 4,094 R$ 3,753 R$ 2,865
ADJUSTMENTS:      
Deferred income tax and social contribution (924) (210) 252
Depreciation and amortization 1,182 1,049 989
Loss on write-off of net residual value of unrecoverable concession financial assets, concessional contract asset, PP&E and Intangible assets 74 47 39
Fair value adjustment of financial assets 172
Renegotiation of hydrological risk costs (Law 14,052/20), net (1,032)
Write off related to contractual assets 1 11 (12)
Bargain purchase (5) (4) (51)
Discount and premium on repurchase of debt securities 47 491
Share of loss of subsidiaries and joint ventures, net (843) (182) (357)
Remeasuring of concession financial and concession contract assets (1,245) (1,306) (801)
Periodic tariff reset adjustments (237) (552)
Interest and monetary variation 853 1,381 1,202
Exchange variation on loans and debentures (338) 353 1,742
Reimbursement of PIS/Pasep and Cofins over ICMS credits to customers - realization (2,360) (1,317) (266)
Gains arising from the sale of non-current asset held for sale (52) (109)
Appropriation of transaction costs 7 20 15
Provisions for operating losses and expected credit losses 433 375 423
Change in fair value of derivative financial instruments 438 538 (1,753)
CVA (Parcel A items Compensation) Account and Other financial components in tariff adjustments 1,147 (2,146) (455)
Post-employment obligations 666 86 491
Other 130 (24) 56
Total  3,477 1,537 3,827
Receivables from customers, traders and concession holders (440) (90) (78)
CVA and Other financial components in tariff adjustments 191 15 1,467
Recoverable taxes 2,490 1,668 (59)
Income tax and social contribution tax credits 149 (555) (162)
Escrow deposits 31 (70) 1,538
Dividends received from investees 708 499 387
Contractual assets and concession financial assets 620 713 688
Other assets 87 (267) 187
Total (increase) / decrease in assets  3,836 1,913 3,968
Increase (decrease) in liabilities      
Suppliers 149 325 278
Taxes payable 408 5 824
Income tax and social contribution tax payable 1,000 1,206 690
Payroll and related charges 35 12 13
Regulatory charges (240) 78 132
Post-employment obligations (482) (422) (367)
Other liabilities 18 101 106
Total increase (decrease) in liabilities  888 1,305 1,676
Cash generated by operating activities 8,201 4,755 9,471
Interest paid on loans and debentures (1,010) (1,589) (1,081)
Interest paid on leasing contracts (4) (3) (4)
Income tax and social contribution tax paid (704) (500) (240)
Cash inflows from settlement of derivatives instruments 129 1,022 461
NET CASH FROM OPERATING ACTIVITIES 6,612 3,685 8,607
INVESTING ACTIVITIES      
Marketable securities 200 2,047 (3,368)
Restricted cash 43 (51)
Investments      
Acquisition of equity investees (52) (56) (120)
Arising from the sale of equity interest, net of costs of sales 52 1,367
Cash arising from business combination 27
Loans to related parties (27)
Property, plant and equipment (173) (182) (132)
Intangible assets (119) (51) (41)
Contract assets - distribution of gas and energy infrastructure (3,112) (1,798) (1,364)
NET CASH FROM USED IN INVESTING ACTIVITIES (3,204) 1,370 (5,076)
FINANCING ACTIVITIES      
Proceeds from loans and debentures 1,981 13 826
Interest on capital and dividends paid (2,094) (1,416) (598)
Payment of loans and debentures (2,613) (4,437) (2,531)
Leasing liabilities paid (66) (70) (84)
NET CASH USED IN FINANCING ACTIVITIES (2,792) (5,910) (2,387)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS FOR THE YEAR 616 (855) 1,144
Cash and cash equivalents at the beginning of the year 825 1,680 536
Cash and cash equivalents at the end of the year R$ 1,441 R$ 825 R$ 1,680