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Schedule II, Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2012
Schedule II, Valuation and Qualifying Accounts [Abstract]  
Schedule II, Valuation and Qualifying Accounts
SCHEDULE II
 
SOUTHWESTERN PUBLIC SERVICE CO.
VALUATION AND QUALIFYING ACCOUNTS
YEARS ENDED DEC. 31, 2012, 2011 AND 2010
(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:
               
2012
 $5,380  $2,915  $1,202  $4,775  $4,722 
2011
  5,095   3,655   1,139   4,509   5,380 
2010
  4,415   3,990   998   4,308   5,095 

(a)
Recovery of amounts previously written off.
(b)
Principally bad debts written off.