| 12.31.17 | 12.31.16 | ||||
| Current: | |||||
| Sales of electricity - Billed | 2,952,780 | 2,522,265 | |||
| Sales of electricity – Unbilled | 2,982,677 | 1,582,591 | |||
| Framework Agreement | 156,412 | 10,938 | |||
| Fee payable for the expansion of the transportation and others | 22,994 | 22,397 | |||
| Receivables in litigation | 22,847 | 22,551 | |||
| Allowance for the impairment of trade receivables | (458,853) | (259,682) | |||
| Total Current | 5,678,857 | 3,901,060 |
The carrying amount of the Company’s trade receivables approximates their fair value.
The roll forward of the allowance for the impairment of trade receivables is as follows:
| 12.31.17 | 12.31.16 | 12.31.15 | |||||
| Balance at beginning of year | 259,682 | 79,361 | 84,562 | ||||
| Increase | 242,750 | 210,745 | 22,979 | ||||
| Decrease | (43,579) | (30,424) | (28,180) | ||||
| Balance at end of the period | 458,853 | 259,682 | 79,361 |
The aging analysis of these trade receivables is as follows:
| 12.31.17 | 12.31.16 | ||||
| Not due | 156,412 | 8,222 | |||
| Past due | 607,998 | 421,661 | |||
| Up to 3 months | 4,914,447 | 3,471,177 | |||
| Total other receivables | 5,678,857 | 3,901,060 |
At the Statement of Financial Position date, the maximum exposure to credit risk is the carrying amount of each class of trade receivables.
The carrying amount of the Company’s trade receivables is denominated in Argentine pesos.
Sensitivity analysis of the allowance for impairment of trade receivables:
| - | 5% increase in the uncollectibility rate estimate |
| 12.31.17 | |||
| Contingencies | 481,796 | ||
| change | 22,943 |
| - | 5% decrease in the uncollectibility rate estimate |
| 12.31.17 | |||
| Contingencies | 435,910 | ||
| change | (22,943) |