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RECEIVABLES FROM CUSTOMERS, TRADERS AND CONCESSION HOLDERS (Tables) | 12 Months Ended
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Dec. 31, 2021
Schedule of trade and other receivables | 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 |  | 2021 |  | 2020
Billed supply |  |  | 1,765 |  |  |  | 720 |  |  |  | 455 |  |  |  | 470 |  |  |  | 3,410 |  |  |  | 3,125 |
Unbilled supply |  |  | 930 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 930 |  |  |  | 1,145 |
Other concession holders — wholesale supply |  |  | 20 |  |  |  | 30 |  |  |  | 1 |  |  |  | 1 |  |  |  | 52 |  |  |  | 50 |
Other concession holders — wholesale supply, unbilled |  |  | 265 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 265 |  |  |  | 260 |
CCEE (Power Trading Chamber) |  |  | 72 |  |  |  | 96 |  |  |  | — |  |  |  | 1 |  |  |  | 169 |  |  |  | 210 |
Concession Holders — power transport |  |  | 63 |  |  |  | 16 |  |  |  | 13 |  |  |  | 78 |  |  |  | 170 |  |  |  | 161 |
Concession Holders — power transport, unbilled |  |  | 319 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 319 |  |  |  | 295 |
(–) Provision for doubtful receivables |  |  | (201 | ) |  |  | (35 | ) |  |  | (88 | ) |  |  | (509 | ) |  |  | (833 | ) |  |  | (712 | )
|  |  | 3,233 |  |  |  | 827 |  |  |  | 381 |  |  |  | 41 |  |  |  | 4,482 |  |  |  | 4,534 |
Current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,430 |  |  |  | 4,373 |
Non-current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 52 |  |  |  | 161 |
Schedule of provision for allowance for doubtful accounts | The provision for expected credit losses of accounts receivable 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: Schedule of provision for allowance for doubtful accounts
|  | 2021 |  | 2020
Residential |  |  | 221 |  |  |  | 110 |
Industrial |  |  | 185 |  |  |  | 188 |
Commercial, services and others |  |  | 220 |  |  |  | 190 |
Rural |  |  | 34 |  |  |  | 30 |
Public authorities |  |  | 45 |  |  |  | 83 |
Public lighting |  |  | 2 |  |  |  | 2 |
Public services |  |  | 38 |  |  |  | 35 |
Charges for use of the network (TUSD) |  |  | 88 |  |  |  | 74 |
|  |  | 833 |  |  |  | 712 |
Schedule of changes in provision for doubtful accounts | Changes in the provision for expected credit losses of accounts receivable in 2021, 2020 and 2019 are as follows: Schedule of changes in provision for doubtful accounts
Balance at December 31, 2018 |  |  | 751 |
Additions, net |  |  | 238 |
Disposals |  |  | (179 | )
Balance at December 31, 2019 |  |  | 810 |
Additions, net |  |  | 146 |
Disposals |  |  | (244 | )
Balance at December 31, 2020 |  |  | 712 |
Additions, net (Note 28) |  |  | 144 |
Disposals |  |  | (23 | )
Balance at December 31, 2021 |  |  | 833 |

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