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Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2020

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


(Millions of Dollars)	2020		2019		2018
Operating revenues:
Electric	$	168	$	177	$	158
Operating expenses:
Purchased power	379		394		411
Transmission expense	61		64		63
Natural gas purchased for resale	1		1		—
Other operating expenses — paid to Xcel Energy Services Inc.	92		87		87

Accounts receivable and payable with affiliates at Dec. 31 were:


	2020				2019
(Millions of Dollars)	Accounts Receivable		Accounts Payable		Accounts Receivable		Accounts Payable
NSP-Minnesota	$	—	$	6	$	—	$	8
PSCo	1		—		—		—
Other subsidiaries of Xcel Energy Inc.	9		9		—		11
	$	10	$	15	$	—	$	19