Selected Balance Sheet Data

3 Months Ended

Mar. 31, 2017

Balance Sheet Related Disclosures [Abstract]

Selected Balance Sheet Data

Selected Balance Sheet Data

(Thousands of Dollars)	March 31, 2017			Dec. 31, 2016
Accounts receivable, net
Accounts receivable	$	321,506		$	324,512
Less allowance for bad debts	(20,093		)	(19,612		)
	$	301,413		$	304,900

(Thousands of Dollars)	March 31, 2017		Dec. 31, 2016
Inventories
Materials and supplies	$	72,427	$	66,161
Fuel	53,769		66,429
Natural gas	35,527		69,630
	$	161,723	$	202,220

(Thousands of Dollars)	March 31, 2017			Dec. 31, 2016
Property, plant and equipment, net
Electric plant	$	12,363,931		$	12,304,436
Natural gas plant	3,748,344			3,710,772
Common and other property	937,353			919,955
Plant to be retired (a)	22,202			31,839
Construction work in progress	583,846			484,340
Total property, plant and equipment	17,655,676			17,451,342
Less accumulated depreciation	(4,642,258		)	(4,601,543		)
	$	13,013,418		$	12,849,799

^(a)  In the fourth quarter of 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.