Selected Balance Sheet Data



(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



(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



(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.