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SUPPLEMENTAL CASH FLOW INFORMATION
 12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Information [Abstract]  
SUPPLEMENTAL CASH FLOW INFORMATION
SUPPLEMENTAL CASH FLOW INFORMATION
CASH TRANSACTIONS
 
Years Ended December 31,
(in millions)
2018
 
2017
 
2016
Interest, Net of Amounts Capitalized
$
67

 
$
61

 
$
61

Income Taxes (1)
—

 
—

 
—


(1) 
TEP did not pay federal or state income taxes due to net operating loss carryforwards offsetting taxable income.
NON-CASH TRANSACTIONS
Other significant non-cash investing and financing activities that affected recognized assets and liabilities but did not result in cash receipts or payments were as follows:
 
Years Ended December 31,
(in millions)
2018
 
2017
 
2016
Gila River Unit 2, Capital Lease
$
164

 
$
—

 
$
—

Accrued Capital Expenditures
31

 
24

 
29

Asset Retirement Obligations Increase (Decrease) (1)
20

 
10

 
(1
)
Renewable Energy Credits
3

 
2

 
2

Commitment to Purchase Capital Lease Interests
—

 
—

 
36

Net Cost of Removal Increase (Decrease) (2)
(4
)
 
(88
)
 
8

(1) 
The non-cash additions to AROs and related capitalized assets represent a revision of estimated asset retirement cost due to changes in timing and amount of the expected future AROs.
(2) 
Represents an accrual for future cost of retirement net of salvage values that does not impact earnings. As approved in the 2017 TEP Rate Order, TEP implemented new depreciation reserves and rates effective March 1, 2018. See Note 2 for additional information.