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Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2021

Significant affiliate transactions among the companies and related parties including billings under the Interchange Agreement for the years ended Dec. 31:


(Millions of Dollars)	2021		2020		2019
Operating revenues:
Electric	$	501	$	440	$	457
Gas	1		1		1
Operating expenses:
Purchased power	67		59		61
Transmission expense	121		109		116
Other operating expenses — paid to Xcel Energy Services Inc.	615		584		533
Interest expense	—		—		1

Accounts receivable and payable with affiliates at Dec. 31:


	2021				2020
(Millions of Dollars)	Accounts Receivable		Accounts Payable		Accounts Receivable		Accounts Payable
NSP-Wisconsin	$	13	$	—	$	6	$	—
PSCo	16		—		1		—
SPS	—		2		—		3
Other subsidiaries of Xcel Energy Inc.	—		61		25		63
	$	29	$	63	$	32	$	66