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12. Trade receivables
 12 Months Ended
Dec. 31, 2018
Trade Receivables  
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

 

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: 

 

       12.31.18     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

 

The aging analysis of these trade receivables is as follows: 

 

       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

 

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

  

       12.31.18 
Contingencies                    946,318
change                      45,063

 

-5% decrease in the uncollectibility rate estimate

  

       12.31.18 
Contingencies                    856,192
change                   (45,063)