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12. Trade receivables (Tables) | 12 Months Ended
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Dec. 31, 2018
Trade Receivables Tables Abstract |
Trade receivables |
|  |  | 12.31.18 |  | 12.31.17
Current: |  |  |  |  |
Sales of electricity - Billed |  |  | 4,622,701 |  | 4,359,990
Sales of electricity – Unbilled |  |  | 3,735,956 |  | 4,404,135
Framework Agreement |  |  | 10,377 |  | 230,953
Fee payable for the expansion of the transportation and others |  |  | 22,969 |  | 33,952
Receivables in litigation |  |  | 97,158 |  | 33,736
Allowance for the impairment of trade receivables |  |  | (901,255) |  | (677,529)
Total Current |  |  | 7,587,906 |  | 8,385,237
Allowance for the impairment of trade receivables |
|  |  | 12.31.18 |  | 12.31.17 |  | 12.31.16
Balance at beginning of year |  |  | 677,529 |  | 383,439 |  | 146,238
Change of accounting standard (Note 6) - Adjustment by model of expected losses IFRS 9 |  |  | 82,041 |  | - |  | -
Balance at beginning of year restated |  |  | 759,570 |  | 383,439 |  | 146,238
Increase |  |  | 916,036 |  | 391,615 |  | 388,339
Decrease |  |  | (307,137) |  | (64,348) |  | (56,062)
Result from exposure to inflation |  |  | (467,214) |  | (33,177) |  | (95,076)
Balance at end of the period |  |  | 901,255 |  | 677,529 |  | 383,439
Aging analysis of trade receivables |
|  |  | 12.31.18 |  | 12.31.17
Not due |  |  | 10,377 |  | 230,953
Past due |  |  | 1,149,406 |  | 897,752
Up to 3 months |  |  | 6,428,123 |  | 7,256,532
Total other receivables |  |  | 7,587,906 |  | 8,385,237
Sensitivity analysis |
| - | 5% increase in the uncollectibility rate estimate
|  |  | 12.31.18
Contingencies |  |  | 946,318
change |  |  | 45,063
| - | 5% decrease in the uncollectibility rate estimate
|  |  | 12.31.18
Contingencies |  |  | 856,192
change |  |  | (45,063)

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