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11. Other receivables (Tables)
12 Months Ended
Dec. 31, 2018
Other Receivables Tables Abstract  
Other receivables
  Note    12.31.18     12.31.17 
Non-current:          
                                   -                                -
Financial credit                          30,484                       54,661
Related parties  35.d                          4,662                         8,015
Advances to suppliers       37                     765,595                                -
Total Non-current                       800,741                       62,676
           
Current:          
Prepaid expenses                           5,312                         7,362
Advances to suppliers                         81,440                         9,791
Advances to personnel                           1,700                         3,293
Security deposits                         16,695                       15,249
Financial credit                          58,425                       17,159
Receivables from electric activities                         98,390                     169,157
Related parties  35.d                          1,946                         1,614
Guarantee deposits on derivative financial
instruments
                             -                       88,667
Judicial deposits                         30,482                       23,795
Credit with SBS Bank Company                           25,000                                -
Other                                24                                2
Allowance for the impairment of other receivables                      (77,297)                    (39,870)
Total Current                       242,117                     296,219
Roll forward of the allowance for the impairment of other receivables
       12.31.18     12.31.17     12.31.16 
Balance at beginning of year                         39,870                       63,940                      32,712
Increase                         61,467                                -                      45,032
Result from exposure to inflation                      (24,040)                                (12,704)                                (13,804)
Recovery                                  -                    (11,366)                                -
Balance at end of the period                         77,297                       39,870                      63,940
Aging analysis
       12.31.18     12.31.17 
Without expiry date                      48,358                    39,526
Past due                      34,854                  129,288
Up to 3 months                     130,564                  110,759
From 3 to 6 months                       20,415                      8,418
From 6 to 9 months                         4,881                      4,198
From 9 to 12 months                         3,045                      4,030
More than 12 months                     800,741                    62,676
Total other receivables                    1,042,858                     358,895