Commitments and Contingencies (Tables)

3 Months Ended

6 Months Ended

Jun. 30, 2023

Jun. 30, 2023

Commitments and Contingencies Disclosure [Abstract]

Lease, Cost

Components of lease expense:

	Three Months Ended June 30
(Millions of Dollars)	2023		2022
Operating leases
PPA capacity payments	$	14	$	13
Other operating leases (a)	1		1
Total operating lease expense (b)	$	15	$	14

(a)Includes $1 million of short-term lease expense for 2023 and an immaterial short-term lease expense for 2022.

(b)PPA capacity payments are included in electric fuel and purchased power on the statements of income. Expense for other operating leases is included in operating and maintenance expense and electric fuel and purchased power.

	Six Months Ended June 30
(Millions of Dollars)	2023		2022
Operating leases
PPA capacity payments	$	27	$	26
Other operating leases (a)	2		3
Total operating lease expense (b)	$	29	$	29

(a)Includes $1 million of short-term lease expense for 2023 and an immaterial short-term lease expense for 2022.

(b)PPA capacity payments are included in electric fuel and purchased power on the statements of income. Expense for other operating leases is included in operating and maintenance expense and electric fuel and purchased power.

Lessee, Operating Lease, Liability, Maturity

Commitments under operating leases as of June 30, 2023:

(Millions of Dollars)	PPA Operating Leases		Other Operating Leases		Total Operating Leases
Total minimum obligation	$	474	$	51	$	525
Interest component of obligation	(93)		(13)		(106)
Present value of minimum obligation	$	381	$	38	419
Less current portion					(32)
Noncurrent operating lease liabilities					$	387