Selected Balance Sheet Data

12 Months Ended

Dec. 31, 2014

Balance Sheet Related Disclosures [Abstract]

Selected Balance Sheet Data

Selected Balance Sheet Data

(Thousands of Dollars)	Dec. 31, 2014			Dec. 31, 2013
Accounts receivable, net
Accounts receivable	$	346,007		$	351,180
Less allowance for bad debts	(23,122		)	(22,505		)
	$	322,885		$	328,675

(Thousands of Dollars)	Dec. 31, 2014		Dec. 31, 2013
Inventories
Materials and supplies	$	55,491	$	53,127
Fuel	80,963		86,062
Natural gas	102,525		98,818
	$	238,979	$	238,007

(Thousands of Dollars)	Dec. 31, 2014			Dec. 31, 2013
Property, plant and equipment, net
Electric plant	$	10,927,867		$	10,177,056
Natural gas plant	3,210,242			2,757,605
Common and other property	827,708			762,916
Plant to be retired (a)	71,534			101,279
Construction work in progress	828,620			952,469
Total property, plant and equipment	15,865,971			14,751,325
Less accumulated depreciation	(4,239,015		)	(4,008,928		)
	$	11,626,956		$	10,742,397

^(a)  As a result of the CPUC’s 2010 approval of PSCo’s CACJA compliance plan and the December 2013 approval of PSCo’s preferred plans for applicable generating resources, PSCo has received approval for early retirement of Cherokee Unit 3 and Valmont Unit 5 between 2015 and 2017. Amounts are presented net of accumulated depreciation.