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Consolidated Statement of Income - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CONTINUING OPERATIONS      
NET REVENUE R$ 22,266 R$ 21,712 R$ 18,773
COST OF ENERGY AND GAS      
Energy purchased for resale (11,084) (10,919) (8,273)
Charges for use of the national grid (1,480) (1,174) (947)
Gas purchased for resale (1,238) (1,071) (878)
Cost of purchased energy sold (13,802) (13,164) (10,098)
OTHER OPERATING COSTS      
Personnel (1,098) (1,270) (1,348)
Materials (81) (73) (41)
Outsourced services (913) (759) (720)
Depreciation and amortization (761) (787) (802)
Operating provisions, net (40) (226) (171)
Infrastructure construction cost (897) (1,119) (1,193)
Others (85) (90) (57)
Other costs (3,875) (4,324) (4,332)
TOTAL COST (17,677) (17,488) (14,430)
Gross Profit 4,589 4,224 4,343
OPERATING EXPENSES      
Selling expenses (264) (248) (382)
General and administrative expenses (672) (763) (667)
Operating provisions (167) (353) (5)
Other operating (expenses) income, net (640) 34 (420)
Operating expense (1,743) (1,330) (1,474)
Share of loss, net, of subsidiaries and joint ventures (104) (252) (302)
Remeasurement of previously held equity interest in subsidiaries acquired (119)    
Impairment loss on Investments (127)   (763)
Income before finance income (expenses) and taxes 2,496 2,642 1,804
Finance income 1,706 804 1,041
Finance expenses (2,224) (1,800) (2,478)
Income before income and social contribution taxes 1,978 1,646 367
Current income and social contribution taxes (583) (446) (174)
Deferred income and social contribution taxes (16) (198) 141
NET INCOME (LOSS) FROM CONTINUING OPERATIONS 1,379 1,002 334
DISCONTINUED OPERATIONS      
Net income after tax for the year from discontinued operations 363    
NET INCOME FOR THE YEAR 1,742 1,002 334
Equity holders of the parent      
Net income from continuing operations 1,378 1,001 334
Net income from discontinued operations 322    
Net income for the year attributed to equity holder the parent 1,700 1,001 334
Non-controlling interests      
Net income from continuing operations 1 1  
Net income from discontinued operations 41    
Net income from Non-controlling interests 42 1 1
NET INCOME FOR THE YEAR R$ 1,742 R$ 1,002 R$ 334
Preferred shares [member]      
Non-controlling interests      
Basic earnings per share - R$ R$ 1.17 R$ 0.84 R$ 0.35
Diluted earnings per share - R$ 1.17 0.84 0.32
Basic earnings per share from continuing operations - R$ 0.95 0.84 0.35
Diluted earnings per share from continuing operations - R$ 0.95 0.84 0.32
Common shares [member]      
Non-controlling interests      
Basic earnings per share - R$ 1.17 0.37 0.10
Diluted earnings per share - R$ 1.17 0.37 0.07
Basic earnings per share from continuing operations - R$ 0.95 0.37 0.10
Diluted earnings per share from continuing operations - R$ R$ 0.95 R$ 0.37 R$ 0.07