Selected Balance Sheet Data

9 Months Ended

Sep. 30, 2020

Balance Sheet Related Disclosures [Abstract]

Selected Balance Sheet Data

(Millions of Dollars)	Sept. 30, 2020		Dec. 31, 2019
Accounts receivable, net
Accounts receivable	$	350.6	$	324.9
Less allowance for bad debts	(25.7)		(21.0)
Accounts receivable, net	$	324.9	$	303.9

(Millions of Dollars)	Sept. 30, 2020		Dec. 31, 2019
Inventories
Materials and supplies	$	63.9	$	62.6
Fuel	63.8		77.1
Natural gas	49.3		52.3
Total inventories	$	177.0	$	192.0

(Millions of Dollars)	Sept. 30, 2020		Dec. 31, 2019
Property, plant and equipment, net
Electric plant	$	15,512.7	$	14,361.9
Natural gas plant	4,894.2		4,631.4
Common and other property	1,157.3		1,113.5
Plant to be retired (a)	286.8		259.9
Construction work in progress	613.5		912.7
Total property, plant and equipment	22,464.5		21,279.4
Less accumulated depreciation	(5,260.0)		(5,124.4)
Property, plant and equipment, net	$	17,204.5	$	16,155.0

(a)In 2018, the CPUC approved early retirement of PSCo’s Comanche Units 1 and 2 in approximately 2022 and 2025, respectively. PSCo also expects Craig Unit 1 to be retired early in 2025. Amounts are presented net of accumulated depreciation.