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Consolidated Statement of Cash Flow - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CASH FLOW FROM OPERATIONS      
Net income for the year R$ 1,002 R$ 334 R$ 2,469
Adjustments to reconcile net income to net cash flows:      
Income tax and Social Contribution taxes 644 33 893
Depreciation and amortization 850 834 835
Loss on write off of net residual value of unrecoverable Concession financial assets , PP&E and Intangible assets 48 109 124
Gain on sale of investments (197) (315)  
Impairment of Investments   763  
Generation Indemnity Revenue (271)    
Adjustment to BRR for transmission assets (75)    
Share of loss (profit) of associates and joint ventures 252 302 (393)
Interest and monetary variation 801 741 802
Appropriation of transaction costs 67 68 16
Gain in accounts receivable from the MG State Govt.-AFAC (239)    
Fair value gain (loss) on shareholding transaction     (729)
Provisions for operating losses 854 704 1,401
Derivative financial instruments-Swap 32    
CVA (Portion A items Compensation) Account and Other financial components in tariff adjustments (988) 1,455 (1,704)
Tax Anmesty Program (PRCT) 283    
Post-retirement obligation (164) 447 285
Total 2,899 5,475 3,999
(Increase) / decrease in assets      
Customers and traders and Concession holders - Transport of electricity (818) (56) (1,475)
Accounts Receivable from the State of Minas Gerais 46    
CVA and Other financial components in tariff adjustments 586 341 1,529
Energy Development Account (CDE) (10) 8 273
Recoverable taxes 10 19 167
Income and social contribution tax credit (62) (62) (77)
Escrow deposits (4) (28) (67)
Dividends received from investments 354 683 487
Concession financial assets 398 (1,941) 10
Advances to suppliers (116) (120) (131)
Gas drawing rights 537 (193) (141)
Others 122 105 (248)
Total (increase) / decrease in assets 1,043 (1,244) 327
Increase (decrease) in liabilities      
Suppliers 403 38 297
Taxes payable (248) 38 202
Income and social contribution taxes payable 14 24 (105)
Payroll and related charges (18) 4 26
Regulatory charges (73) 92 386
Advances from clients 52    
Post-retirement obligation (282) (239) (208)
Derivative financial instruments - Put options (830) (150)  
Others (357) (167) 156
Total increase (decrease) in liabilities (1,339) (360) 754
Cash generated by operating activities 2,603 3,871 5,080
Interest paid on loans and financings (1,797) (2,369) (1,331)
Income and Social Contribution taxes paid (226) (289) (741)
NET CASH FROM OPERATING ACTIVITIES 580 1,213 3,008
INVESTING ACTIVITIES      
Marketable securities (4) 1,400 (1,499)
Financial assets     (145)
Restricted cash 261 (367) 1
Investments 0 0 0
Acquisition of equity investees (38)   (310)
Disposal of investments 766 949  
Capital contributions in investees (254) (1,455) (181)
Property, plant and equipment (83) (120) (126)
Intangible assets (1,034) (1,021) (957)
NET CASH USED IN INVESTING ACTIVITIES (386) (614) (3,217)
FINANCING ACTIVITIES      
Subscription of shares, to be capitalized 1,215    
Proceeds from Loans, financings and debentures 3,308 5,737 5,739
Borrowing costs (11)    
Payment of loans, financings and debentures (4,131) (5,591) (4,696)
Interest on capital and dividends paid (540) (675) (796)
NET CASH (USED IN) FROM FINANCING ACTIVITIES (159) (529) 247
Net increase in cash and cash equivalents 35 70 38
Cash and cash equivalents at the beginning of the year 995 925 887
Cash and cash equivalents at the end of the year R$ 1,030 R$ 995 R$ 925