Commitment and Contingencies (Tables)

3 Months Ended

6 Months Ended

Jun. 30, 2022

Jun. 30, 2022

Commitments and Contingencies Disclosure [Abstract]

Lease, Cost

Components of lease expense:

	Three Months Ended June 30
(Millions of Dollars)	2022		2021
Operating leases
PPA capacity payments	$	24	$	17
Other operating leases (a)	2		3
Total operating lease expense (b)	$	26	$	20

(a)Includes short-term lease expense of $1 million for 2022 and 2021, respectively.

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

	Six Months Ended June 30
(Millions of Dollars)	2022		2021
Operating leases
PPA capacity payments	$	49	$	36
Other operating leases (a)	4		5
Total operating lease expense (b)	$	53	$	41

(a)Includes short-term lease expense of $1 million for 2022 and 2021, respectively.

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

Lessee, Operating Lease, Liability, Maturity

Commitments under operating leases as of June 30, 2022:

(Millions of Dollars)	PPA Operating Leases		Other Operating Leases		Total Operating Leases
Total minimum obligation	$	366	$	69	$	435
Interest component of obligation	(25)		(11)		(36)
Present value of minimum obligation	$	341	$	58	399
Less current portion					(96)
Noncurrent operating lease liabilities					$	303