Selected Balance Sheet Data (Tables)

9 Months Ended

Sep. 30, 2022

Balance Sheet Related Disclosures [Abstract]

Accounts receivable, net

(Millions of Dollars)	Sept. 30, 2022		Dec. 31, 2021
Accounts receivable, net
Accounts receivable	$	1,308	$	1,124
Less allowance for bad debts	(112)		(106)
Accounts receivable, net	$	1,196	$	1,018

Inventories

(Millions of Dollars)	Sept. 30, 2022		Dec. 31, 2021
Inventories
Materials and supplies	$	321	$	289
Fuel	234		182
Natural gas	315		160
Total inventories	$	870	$	631

Property, plant and equipment, net

(Millions of Dollars)	Sept. 30, 2022		Dec. 31, 2021
Property, plant and equipment, net
Electric plant	$	48,959	$	48,680
Natural gas plant	8,199		7,758
Common and other property	2,824		2,602
Plant to be retired (a)	2,258		1,200
Construction work in progress	2,445		1,969
Total property, plant and equipment	64,685		62,209
Less accumulated depreciation	(17,639)		(17,060)
Nuclear fuel	3,105		3,081
Less accumulated amortization	(2,864)		(2,773)
Property, plant and equipment, net	$	47,287	$	45,457

(a)Amounts as of Dec. 31, 2021 include Sherco Units 1, 2 and 3 and A.S. King for NSP-Minnesota; Comanche Unit 1 and 2 and Craig Units 1 and 2 for PSCo; and Tolk and coal generation assets at Harrington pending facility gas conversion for SPS. Following the June 2022 approval of PSCo’s revised resource plan settlement, amounts as of Sept. 30, 2022 include the addition of Comanche Unit 3, Hayden Units 1 and 2 and coal generation assets at Pawnee pending facility gas conversion. Amounts are presented net of accumulated depreciation.