Selected Balance Sheet Data

6 Months Ended

Jun. 30, 2014

Balance Sheet Related Disclosures [Abstract]

Selected Balance Sheet Data

Selected Balance Sheet Data

(Thousands of Dollars)	June 30, 2014			Dec. 31, 2013
Accounts receivable, net
Accounts receivable	$	291,856		$	351,180
Less allowance for bad debts	(21,461		)	(22,505		)
	$	270,395		$	328,675

(Thousands of Dollars)	June 30, 2014		Dec. 31, 2013
Inventories
Materials and supplies	$	53,452	$	53,127
Fuel	82,680		86,062
Natural gas	70,385		98,818
	$	206,517	$	238,007

(Thousands of Dollars)	June 30, 2014			Dec. 31, 2013
Property, plant and equipment, net
Electric plant	$	10,356,644		$	10,177,056
Natural gas plant	2,866,667			2,757,605
Common and other property	751,236			762,916
Plant to be retired (a)	85,808			101,279
Construction work in progress	1,191,676			952,469
Total property, plant and equipment	15,252,031			14,751,325
Less accumulated depreciation	(4,126,553		)	(4,008,928		)
	$	11,125,478		$	10,742,397

^(a)  As a result of the 2010 Colorado Public Utilities Commission (CPUC) approval of PSCo’s Clean Air Clean Jobs Act (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.