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Consolidated Statement of Income - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
NET REVENUE R$ 21,712 R$ 18,773 R$ 21,868
COST OF ENERGY AND GAS      
Energy purchased for resale (10,919) (8,273) (9,542)
Charges for the use of the national grid (1,174) (947) (999)
Gas purchased for resale (1,071) (878) (1,051)
Cost of purchased energy sold (13,164) (10,098) (11,592)
OTHER COSTS      
Personnel and managers (1,270) (1,348) (1,143)
Materials (73) (41) (126)
Outsourced services (759) (720) (740)
Depreciation and amortization (787) (802) (811)
Operating provisions, net (226) (171) (23)
Infrastructure construction cost (1,119) (1,193) (1,252)
Other (90) (57) (96)
Other costs (4,324) (4,332) (4,191)
TOTAL COST (17,488) (14,430) (15,783)
GROSS PROFIT 4,224 4,343 6,085
OPERATING EXPENSES 1,330 1,474 2,504
Selling expenses (248) (382) (175)
General and administrative expenses (763) (667) (674)
Operating provisions (353) (5) (1,203)
Other operating revenues (expenses) 34 (420) (452)
Operating expense (1,330) (1,474) (2,504)
Share of (loss) profit, net, of associates and joint ventures (252) (302) 393
Impairment loss on Investments   (763)  
Fair value gain on shareholding transaction     729
Income before finance income (expenses) and taxes 2,642 1,804 4,703
Finance income 804 1,041 863
Finance expenses (1,800) (2,478) (2,204)
Income before income tax and social contribution tax 1,646 367 3,362
Current income and social contribution taxes (446) (174) (881)
Deferred income and social contribution taxes (198) 141 (12)
NET INCOME (LOSS) FOR THE YEAR 1,002 334 2,469
Total of net income for the year attributed to:      
Equity holders of the parent 1,001 334 2,469
Non-controllinginterests 1    
NET INCOME (LOSS) FOR THE YEAR R$ 1,002 R$ 334 R$ 2,469
Preferred shares [member]      
Total of net income for the year attributed to:      
Basic earnings per preferred share - R$ R$ 0.84 R$ 0.35 R$ 1.96
Basic earnings per preferred share - R$ 0.84 0.32 1.96
Common shares [member]      
Total of net income for the year attributed to:      
Basic earnings per preferred share - R$ 0.37 0.10 1.96
Basic earnings per preferred share - R$ R$ 0.37 R$ 0.07 R$ 1.96