Customers, Traders and Power Transport Concession Holders (Tables)

12 Months Ended

Dec. 31, 2017


	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		2017		2016
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.