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Consolidated Statement of Cash Flow - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CASH FLOW FROM OPERATIONS      
Net income for the year from continuing operations R$ 1,379 R$ 1,002 R$ 334
Net income for the year from discontinuing operations 363    
Net income for the year 1,742 1,002 334
Adjustments to reconcile net income to net cash flows:      
Non-controlling interests (42) (1) (1)
Income tax and social contribution taxes 16 198 (141)
Depreciation and amortization 850 850 834
Loss on write-off of net residual value of unrecoverable Concession financial assets , PP&E and Intangible assets 61 48 109
Impairment of contract assets 42    
Gain on sale of investments (378) (197) (315)
Impairment loss on investments 127   763
Generation Indemnity Revenue (55) (271)  
Adjustment to Remuneration Assets Base - BRR for transmission assets   (75)  
Share of loss, net, of subsidiaries and joint ventures 104 252 302
Updating of concession financial and concession contract assets (585) (753) (1,110)
Interest and monetary variation 1,207 1,498 1,851
Exchange variation on loans 582 56  
Reversal of monetary updating on Advance for Future Capital Increase - AFAC   (239)  
Tax Anmesty Program (PRCT)   283  
Appropriation of transaction costs 33 67 68
Provisions for operating losses 466 854 704
Provision for reimbursement for suspension of energy supply - Renova (60)    
Net loss on derivative instruments at fair value through profit or loss (893) 32  
CVA (Parcel A items Compensation) Account and Other financial components in tariff adjustments (1,973) (988) 1,455
Remeasurement of previously held equity interest in subsidiaries acquired 119    
Loss on other credits 12    
Post-employment obligations 405 (164) 447
Total 1,780 2,452 5,301
(Increase) / decrease in assets      
Customers and traders and Concession holders - Transport of electricity (391) (818) (56)
Accounts Receivable from the State of Minas Gerais   46  
CVA and Other financial components in tariff adjustments 909 586 341
Energy Development Account (CDE)   (10) 8
Recoverable taxes 38 10 19
Income and social contribution tax credits 615 385 (62)
Escrow deposits (109) (4) (28)
Dividends received from investees 311 354 683
Concession financial assets: reimbursement - generation plants 1,139    
Concession contract and financial assets 565 398 (1,941)
Advances to suppliers 29 (116) (120)
Gas drawing rights 75 537 (193)
Others (27) 122 105
Total (increase) / decrease in assets 3,154 1,490 (1,244)
Increase (decrease) in liabilities      
Suppliers (553) 403 38
Taxes payable (291) (248) 38
Income and social contribution taxes payable (6) 14 198
Payroll and related charges 77 (18) 4
Regulatory charges (70) (73) 92
Advances from customers (153) 52  
Post-employment obligations (307) (282) (239)
Derivative financial instruments -Put options (555) (830) (150)
Others (165) (357) (167)
Total increase (decrease) in liabilities (2,023) (1,339) (186)
Cash generated by operating activities 2,911 2,603 3,871
Interest paid on loans and financing (1,290) (1,797) (2,369)
Income and social contribution taxes paid (650) (226) (289)
Cash inflows from settlement of derivatives instruments 37    
NET CASH FROM OPERATING ACTIVITIES 1,008 580 1,213
INVESTING ACTIVITIES      
Marketable securities 276 (4) 1,400
Restricted cash 15 261 (367)
Investments 0 0 0
Acquisition of equity investees (109) (38)  
Disposal of investments 655 766 949
Capital contributions in investees (241) (254) (1,455)
Cash arising from business combination 71    
Property, plant and equipment (77) (83) (120)
Concession contract assets - gas and distribution infrastructure (771)    
Intangible assets (30) (1,034) (1,021)
NET CASH USED IN INVESTING ACTIVITIES (211) (386) (614)
FINANCING ACTIVITIES      
Subscription of shares, to be capitalized   1,215  
Capital increase 110    
Interest on capital and dividends paid (509) (540) (675)
Proceeds from Loans, financings and debentures 2,990 3,308 5,737
Borrowing costs   (11)  
Payment of loans, financing and debentures (3,527) (4,131) (5,591)
NET CASH USED IN FINANCING ACTIVITIES (936) (159) (529)
Net (decrease) increase in cash and cash equivalents for the year (139) 35 70
Cash and cash equivalents at the beginning of the year 1,030 995 925
Cash and cash equivalents at the end of the year R$ 891 R$ 1,030 R$ 995