Selected Balance Sheet Data

9 Months Ended

Sep. 30, 2016

Balance Sheet Related Disclosures [Abstract]

Selected Balance Sheet Data

Selected Balance Sheet Data

(Thousands of Dollars)	Sept. 30, 2016			Dec. 31, 2015
Accounts receivable, net
Accounts receivable	$	289,135		$	321,004
Less allowance for bad debts	(19,023		)	(20,122		)
	$	270,112		$	300,882

(Thousands of Dollars)	Sept. 30, 2016		Dec. 31, 2015
Inventories
Materials and supplies	$	58,949	$	58,128
Fuel	78,246		78,586
Natural gas	80,079		68,848
	$	217,274	$	205,562

(Thousands of Dollars)	Sept. 30, 2016			Dec. 31, 2015
Property, plant and equipment, net
Electric plant	$	12,136,597		$	11,856,126
Natural gas plant	3,590,746			3,420,249
Common and other property	867,340			862,840
Plant to be retired (a)	36,852			38,249
Construction work in progress	559,808			408,963
Total property, plant and equipment	17,191,343			16,586,427
Less accumulated depreciation	(4,562,971		)	(4,414,216		)
	$	12,628,372		$	12,172,211

^(a)  In 2017, PSCo expects to both early retire Valmont Unit 5 and convert Cherokee Unit 4 from a coal-fueled generating facility to natural gas. PSCo also expects Craig Unit 1 to be early retired in approximately 2025.  Amounts are presented net of accumulated depreciation.