Schedule II, Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2017

Valuation and Qualifying Accounts [Abstract]

Schedule II, Valuation and Qualifying Accounts

PUBLIC SERVICE CO. OF COLORADO AND SUBSIDIARIES

VALUATION AND QUALIFYING ACCOUNTS

YEARS ENDED DEC. 31, 2017, 2016 AND 2015

(amounts in thousands)

			Additions
	Balance at Jan. 1		Charged to Costs and Expenses		Charged to Other Accounts(a)		Deductions from Reserves(b)		Balance at Dec. 31
Allowance for bad debts:
2017	$	19,612	$	14,303	$	3,968	$	18,277	$	19,606
2016	20,122		14,121		4,447		19,078		19,612
2015	23,122		13,052		5,175		21,227		20,122

^(a)  Recovery of amounts previously written off.

^(b)  Deductions relate primarily to bad debt write-offs.