Selected Balance Sheet Data

3 Months Ended

Mar. 31, 2021

Balance Sheet Related Disclosures [Abstract]

Selected Balance Sheet Data

(Millions of Dollars)	March 31, 2021		Dec. 31, 2020
Accounts receivable, net
Accounts receivable	$	410	$	371
Less allowance for bad debts	(31)		(29)
Accounts receivable, net	$	379	$	342

(Millions of Dollars)	March 31, 2021		Dec. 31, 2020
Inventories
Materials and supplies	$	63	$	63
Fuel	64		73
Natural gas	31		53
Total inventories	$	158	$	189

(Millions of Dollars)	March 31, 2021		Dec. 31, 2020
Property, plant and equipment, net
Electric plant	$	15,854	$	15,736
Natural gas plant	5,104		5,037
Common and other property	1,197		1,191
Plant to be retired (a)	214		225
Construction work in progress	594		510
Total property, plant and equipment	22,963		22,699
Less accumulated depreciation	(5,347)		(5,229)
Property, plant and equipment, net	$	17,616	$	17,470

(a)Includes regulator-approved retirements of Comanche Units 1 and 2 and jointly owned Craig Unit 1. Also includes PSCo’s planned retirement of jointly owned Craig Unit 2.