Related Party Transactions

12 Months Ended

Dec. 31, 2021

Xcel Energy Services Inc. provides management, administrative and other services for the subsidiaries of Xcel Energy Inc., including NSP-Minnesota. The services are provided and billed to each subsidiary in accordance with service agreements executed by each subsidiary. NSP-Minnesota uses the services 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.

The electric production and transmission costs of the entire NSP System are shared by NSP-Minnesota and NSP-Wisconsin. The Interchange Agreement provides for the sharing of all costs of generation and transmission facilities of the system, including capital costs.

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