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Schedule II, Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2018
SEC Schedule, 12-09, 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, 2018, 2017 AND 2016
 
Allowance for bad debts
(Millions of Dollars)
2018
 
2017
 
2016
Balance at Jan. 1
$
19.6

 
$
19.6

 
$
20.1

Additions Charged to Costs and Expenses
16.4

 
14.3

 
14.1

Additions Charged to Other Accounts (a)
4.7

 
4.0

 
4.5

Deductions from Reserves (b)
(20.2
)
 
(18.3
)
 
(19.1
)
Balance at Dec. 31
$
20.5

 
$
19.6

 
$
19.6

(a) 
Recovery of amounts previously written off.
(b) 
Deductions relate primarily to bad debt write-offs.