SUPPLEMENTARY INFORMATION (Notes)

3 Months Ended

Mar. 31, 2018

Supplemental Cash Flow Elements [Abstract]

Pass through costs

Pass through costs are costs for which we receive a direct contractually committed reimbursement from municipal clients which sponsor an energy-from-waste project. These costs generally include utility charges, insurance premiums, ash residue transportation and disposal, and certain chemical costs. These costs are recorded net of municipal client reimbursements as a reduction to "Plant operating expense," in our condensed consolidated statement of operations.

Pass through costs were as follows (in millions):



	Three Months Ended March 31,
	2018		2017
Pass through costs	$	14	$	10

Other operating expenses, net

Insurance Recoveries

Fairfax County Energy-from-Waste Facility

In February 2017, our Fairfax County energy-from-waste facility experienced a fire in the front-end receiving portion of the facility. During the first quarter of 2017, we completed our evaluation of the impact of this event and recorded an immaterial asset impairment, which we have since recovered from insurance proceeds. The facility resumed operations in December 2017. We expect receipt of remaining insurance recoveries for both property loss and business interruption in the remainder of 2018.

The cost of repair or replacement of assets and business interruption losses is insured under the terms of applicable insurance policies, subject to deductibles. We recorded insurance gains, as a reduction to "Other operating expense, net," in our condensed consolidated statement of operations as follows (in millions):



	Three Months Ended March 31,
	2018		2017
Insurance gains for property and clean-up costs, net of impairment charges	$	7	$	1
Insurance gains for business interruption costs, net of costs incurred	$	7	$	1