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Related Party Transactions

12 Months Ended

Dec. 31, 2020

l Energy Services Inc. provides management, administrative and other services for the subsidiaries of Xcel Energy Inc., including SPS. The services are provided and billed to each subsidiary in accordance with service agreements executed by each subsidiary. SPS uses the service provided by Xcel Energy Services Inc. whenever possible. Costs are charged directly to the subsidiary and are allocated if they cannot be directly assigned.

Xcel Energy Inc., NSP-Minnesota, NSP-Wisconsin, PSCo and SPS have established a utility money pool arrangement.

See Note 5 for further information.

Significant affiliate transactions among the companies and related parties for the years ended Dec. 31:


(Millions of Dollars)	2020		2019		2018
Operating expenses:

Other operating expenses — paid to Xcel Energy Services Inc.	$	200	$	192	$	195
Interest expense	—		—		1

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	$	3	$	—	$	4	$	—
PSCo	6		—		—		—
Other subsidiaries of Xcel Energy Inc.	—		17		—		20
	$	9	$	17	$	4	$	20