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Customers, Traders and Power Transport Concession Holders (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Summary of Trade and Other Receivables |
|  | Balances not yet due |  |  | Up to 90 days past due |  |  | More than 90 days past due |  |  | 2017 |  |  | 2016 |
Billed supply |  |  | 1,309 |  |  |  | 698 |  |  |  | 680 |  |  |  | 2,687 |  |  |  | 2,568 |
Unbilled supply |  |  | 994 |  |  |  | — |  |  |  | — |  |  |  | 994 |  |  |  | 920 |
Other concession holders – wholesale supply |  |  | 9 |  |  |  | 21 |  |  |  | (4 | ) |  |  | 26 |  |  |  | 80 |
Other concession holders – wholesale supply, unbilled |  |  | 283 |  |  |  | — |  |  |  | — |  |  |  | 283 |  |  |  | 343 |
CCEE (Wholesale Trading Exchange) |  |  | 255 |  |  |  | 119 |  |  |  | 8 |  |  |  | 382 |  |  |  | 1 |
Concession Holders – power transport |  |  | 75 |  |  |  | 5 |  |  |  | 79 |  |  |  | 159 |  |  |  | 124 |
Concession Holders – power transport, unbilled |  |  | 177 |  |  |  | — |  |  |  | — |  |  |  | 177 |  |  |  | 195 |
(–) Provision for doubtful receivables |  |  | — |  |  |  | — |  |  |  | (568 | ) |  |  | (568 | ) |  |  | (660 | )
|  |  | 3,102 |  |  |  | 843 |  |  |  | 195 |  |  |  | 4,140 |  |  |  | 3,571 |
Current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,885 |  |  |  | 3,425 |
Non-current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 255 |  |  |  | 146 |
Summary 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 as follows:
|  | 2017 |  |  | 2016 |
Residential |  |  | 160 |  |  |  | 245 |
Industrial |  |  | 178 |  |  |  | 133 |
Commercial, services and others |  |  | 117 |  |  |  | 152 |
Rural |  |  | 17 |  |  |  | 24 |
Public authorities |  |  | 12 |  |  |  | 10 |
Public lighting |  |  | 5 |  |  |  | 5 |
Public services |  |  | 10 |  |  |  | 15 |
Charges for use of the network (TUSD) |  |  | 68 |  |  |  | 68 |
Others |  |  | 1 |  |  |  | 8 |
|  |  | 568 |  |  |  | 660 |
Summary of Changes in Provision for Doubtful Accounts | Changes in the allowance for doubtful accounts in 2017, 2016 and 2015 are as follows:
Balance at December 31, 2014 |  |  | 650 |
Additions, net |  |  | 175 |
Written off |  |  | (200 | )
Balance at December 31, 2015 |  |  | 625 |
Additions, net |  |  | 382 |
Written off |  |  | (347 | )
Balance at December 31, 2016 |  |  | 660 |
Additions, net |  |  | 248 |
Written off |  |  | (340 | )
Balance at December 31, 2017 |  |  | 568 |
Summary of Advances from Customers | Cemig GT receives advance payments for the sale of energy from certain customers. Advance payments related to services not yet provide are as follows:
Balance at December 31, 2016 |  |  | 181 |
Addition |  |  | 325 |
Supply completed |  |  | (318 | )
Monetary adjustment |  |  | 45 |
Balance at December 31, 2017 |  |  | 233 |
Summary of Terms of Advances from Clients | Advance payments are adjusted until the actual delivery of the power supply under the following terms:
2017 |  |  | 2017 |  |  | 2016 |
Counterparty |  | Specified period for billing |  |  | Index for adjusting prepaid amounts |  | GWh deliverable |  |  |
BTG Pactual |  |  | Jan. 2018 |  |  | 1.57% p.m. |  |  | 137 |  |  |  | 18 |  |  |  | 181 |
BTG Pactual |  |  | Jan. 2018 |  |  | 1.2% p.m. |  |  | 172 |  |  |  | 26 |  |  |  | — |
Deal Comercializadora |  |  | Jan. 2018 |  |  | 1.2% p.m. |  |  | 5 |  |  |  | 1 |  |  |  | — |
White Martins Gases Industriais Ltda. |  |  | Feb. 2018 to Mar. 2019 |  |  | 124% of CDI |  |  | 334 |  |  |  | 146 |  |  |  | — |
White Martins Gases Industriais Ltda. (1) |  |  | Feb. 2018 to Jul. 2019 |  |  | 124% of CDI |  |  | — |  |  |  | 42 |  |  |  | — |
|  |  |  |  |  |  |  |  |  |  |  |  | 233 |  |  |  | 181 |
(1) | Contracts signed with Cemig D, relating to the billing of Contract for Use of the Distribution System (CUSD), containing the components: transportation and other charges.

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