Related Party Transactions

12 Months Ended

Dec. 31, 2023

Related Party Transactions [Abstract]

Related Party Transactions

12. Related Party Transactions

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

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)	2023		2022		2021
Operating revenues:
Electric	$	204	$	202	$	189
Operating expenses:
Purchased power (a)	424		445		408
Transmission expense	69		68		64
Natural gas purchased for resale	1		—		1
Other operating expenses — paid to Xcel Energy Services Inc.	119		114		99
Interest income	1		—		—
Interest expense	1		1		—

(a)Amount includes $16 million deferred fuel cost regulatory asset for the year ended Dec. 31 2023, and an immaterial amount of fuel costs amortized or deferred for the years ended Dec. 31, 2022 and 2021.

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

	2023				2022
(Millions of Dollars)	Accounts Receivable		Accounts Payable		Accounts Receivable		Accounts Payable
NSP-Minnesota	$	—	$	9	$	—	$	4
PSCo	1		—		2		—
Other subsidiaries of Xcel Energy Inc.	12		13		6		15
	$	13	$	22	$	8	$	19