Selected Balance Sheet Data

9 Months Ended

Sep. 30, 2017

Balance Sheet Related Disclosures [Abstract]

Selected Balance Sheet Data

Selected Balance Sheet Data

(Thousands of Dollars)	Sept. 30, 2017			Dec. 31, 2016
Accounts receivable, net
Accounts receivable	$	319,051		$	324,512
Less allowance for bad debts	(19,684		)	(19,612		)
	$	299,367		$	304,900

(Thousands of Dollars)	Sept. 30, 2017		Dec. 31, 2016
Inventories
Materials and supplies	$	69,051	$	66,161
Fuel	56,247		66,429
Natural gas	80,342		69,630
	$	205,640	$	202,220

(Thousands of Dollars)	Sept. 30, 2017			Dec. 31, 2016
Property, plant and equipment, net
Electric plant	$	12,542,171		$	12,304,436
Natural gas plant	3,904,223			3,710,772
Common and other property	943,117			919,955
Plant to be retired (a)	11,412			31,839
Construction work in progress	874,399			484,340
Total property, plant and equipment	18,275,322			17,451,342
Less accumulated depreciation	(4,724,834		)	(4,601,543		)
	$	13,550,488		$	12,849,799

^(a)  In the third quarter of 2017, PSCo early retired Valmont Unit 5 and converted 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.