Schedule II, Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2025

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule II, Valuation and Qualifying Accounts

Southwestern Public Service Co. Valuation and Qualifying Accounts Years Ended Dec. 31

	Allowance for bad debts									NOL and tax credit valuation allowances
(Millions of Dollars)	2025			2024			2023			2025			2024			2023
Balance at Jan. 1	$	12		$	15		$	13		$	—		$	2		$	—
Additions charged to costs and expenses	8			8			11			6			10			2
Additions charged to other accounts	2		(a)	2		(a)	1		(a)	—			—			—
Deductions from reserves	(12)		(b)	(13)		(b)	(10)		(b)	(6)		(c)	(12)		(c)	—		(c)
Balance at Dec. 31	$	10		$	12		$	15		$	—		$	—		$	2

(a)Recovery of amounts previously written-off.

(b)Deductions related primarily to bad debt write-offs.