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8. RECEIVABLES FROM CUSTOMERS, TRADERS AND POWER TRANSPORT CONCESSION HOLDERS (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of trade and other receivables [abstract] |
Schedule of trade and other receivables |
|  | Balances not yet due |  |  | Up to 90 days past due |  |  | More than 91 up to 360 days past due |  |  | More than 361 days past due |  |  | 2020 |  |  | 2019 |
Billed supply |  |  | 1,518 |  |  |  | 637 |  |  |  | 387 |  |  |  | 583 |  |  |  | 3,125 |  |  |  | 3,130 |
Unbilled supply |  |  | 1,145 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,145 |  |  |  | 1,204 |
Other concession holders – wholesale supply |  |  | 18 |  |  |  | 26 |  |  |  | 1 |  |  |  | 5 |  |  |  | 50 |  |  |  | 47 |
Other concession holders – wholesale supply, unbilled |  |  | 260 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 260 |  |  |  | 204 |
CCEE (Power Trading Chamber) |  |  | 21 |  |  |  | 189 |  |  |  | — |  |  |  | — |  |  |  | 210 |  |  |  | 386 |
Concession Holders – power transport |  |  | 45 |  |  |  | 14 |  |  |  | 17 |  |  |  | 85 |  |  |  | 161 |  |  |  | 187 |
Concession Holders – power transport, unbilled |  |  | 295 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 295 |  |  |  | 253 |
(–) Provision for doubtful receivables |  |  | (278 | ) |  |  | (12 | ) |  |  | (15 | ) |  |  | (407 | ) |  |  | (712 | ) |  |  | (810 | )
|  |  | 3,024 |  |  |  | 854 |  |  |  | 390 |  |  |  | 266 |  |  |  | 4,534 |  |  |  | 4,601 |
Current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,373 |  |  |  | 4,524 |
Non-current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 161 |  |  |  | 77 |
Schedule of provision for allowance for doubtful accounts | The allowance for doubtful accounts is considered to be sufficient to cover any potential losses in the realization of accounts receivable, and the breakdown by type of customers is as follows:
|  | 2020 |  | 2019
Residential |  |  | 110 |  |  |  | 131 |
Industrial |  |  | 188 |  |  |  | 197 |
Commercial, services and others |  |  | 190 |  |  |  | 161 |
Rural |  |  | 30 |  |  |  | 32 |
Public authorities |  |  | 83 |  |  |  | 201 |
Public lighting |  |  | 2 |  |  |  | 2 |
Public services |  |  | 35 |  |  |  | 31 |
Charges for use of the network (TUSD) |  |  | 74 |  |  |  | 55 |
|  |  | 712 |  |  |  | 810 |
Schedule of changes in provision for doubtful accounts | Changes in the allowance for doubtful accounts in 2020, 2019 and 2018 are as follows:
Balance at December 31, 2017 |  |  | 568 |
Effect of adoption of IFRS 9 on Jan. 1, 2018 |  |  | 150 |
Additions, net (Note 30 d) |  |  | 264 |
Write-off |  |  | (231 | )
Balance at December 31, 2018 |  |  | 751 |
Additions, net (Note 30 d) |  |  | 238 |
Disposals |  |  | (179 | )
Balance at December 31, 2019 |  |  | 810 |
Additions, net (Note 30 d) |  |  | 146 |
Disposals |  |  | (244 | )
Balance at December 31, 2020 |  |  | 712 |

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