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Selected Balance Sheet Data (Tables)
 12 Months Ended
Dec. 31, 2013
Balance Sheet Related Disclosures [Abstract]  
Accounts Receivable, Net
(Thousands of Dollars)
 
Dec. 31, 2013
 
Dec. 31, 2012
Accounts receivable, net
 
 
 
 
Accounts receivable
 
$
351,180

 
$
299,379

Less allowance for bad debts
 
(22,505
)
 
(21,918
)
 
 
$
328,675

 
$
277,461
Inventories
(Thousands of Dollars)
 
Dec. 31, 2013
 
Dec. 31, 2012
Inventories
 
 
 
 
Materials and supplies
 
$
53,127

 
$
54,486

Fuel
 
86,062

 
89,246

Natural gas
 
98,818

 
80,062

 
 
$
238,007

 
$
223,794
Property, Plant and Equipment, Net
(Thousands of Dollars)
 
Dec. 31, 2013
 
Dec. 31, 2012
Property, plant and equipment, net
 
 
 
 
Electric plant
 
$
10,177,056

 
$
9,782,163

Natural gas plant
 
2,757,605

 
2,583,394

Common and other property
 
762,916

 
761,712

Plant to be retired (a)
 
101,279

 
152,730

Construction work in progress
 
952,469

 
506,225

Total property, plant and equipment
 
14,751,325

 
13,786,224

Less accumulated depreciation
 
(4,008,928
)
 
(3,755,233
)
 
 
$
10,742,397

 
$
10,030,991



(a) 
As a result of the CPUC’s 2010 approval of PSCo’s CACJA compliance plan, subsequent CPCNs and the December 2013 approval of PSCo’s preferred plans for applicable generating resources, PSCo has received approval for early retirement of Cherokee Units 1, 2 and 3, Arapahoe Units 3 and 4 and Valmont Unit 5 between 2011 and 2017. In 2011, Cherokee Unit 2 was retired, in 2012, Cherokee Unit 1 was retired, and in 2013, Arapahoe Units 3 and 4 were retired. Amounts are presented net of accumulated depreciation.