Property Plant and Equipment Property Plant and Equipment

12 Months Ended

Dec. 31, 2022

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Disclosure

Major classes of property, plant and equipment

(Millions of Dollars)	Dec. 31, 2022		Dec. 31, 2021
Property, plant and equipment, net
Electric plant	$	49,639	$	48,680
Natural gas plant	8,514		7,758
Common and other property	2,970		2,602
Plant to be retired (a)	2,217		1,200
CWIP	2,124		1,969
Total property, plant and equipment	65,464		62,209
Less accumulated depreciation	(17,502)		(17,060)
Nuclear fuel	3,183		3,081
Less accumulated amortization	(2,892)		(2,773)
Property, plant and equipment, net	$	48,253	$	45,457

(a)Amounts as of Dec. 31, 2021 include Sherco Units 1, 2 and 3 and A.S. King for NSP-Minnesota; Comanche Unit 1 and 2 and Craig Units 1 and 2 for PSCo; and Tolk and coal generation assets at Harrington pending facility gas conversion for SPS. Following the June 2022 approval of PSCo’s revised resource plan settlement, amounts as of Dec. 31, 2022 include the addition of Comanche Unit 3, Hayden Units 1 and 2 and coal generation assets at Pawnee pending facility gas conversion as well as the removal of Comanche Unit 1 that was retired in 2022. Amounts are presented net of accumulated depreciation.

Joint Ownership of Generation, Transmission and Gas Facilities

The utility subsidiaries’ jointly owned assets as of Dec. 31, 2022:

(Millions of Dollars, Except Percent Owned)	Plant in Service		Accumulated Depreciation		Percent Owned
NSP-Minnesota
Electric generation:
Sherco Unit 3	$	623	$	468	59	%
Sherco common facilities	180		115		80
Sherco substation	5		4		59
Electric transmission:
Grand Meadow	11		3		50
Huntley Wilmarth	49		1		50
CapX2020	818		124		51
Total NSP-Minnesota (a)	$	1,686	$	715

(a)Projects additionally include $4 million in CWIP.

(Millions of Dollars, Except Percent Owned)	Plant in Service		Accumulated Depreciation		Percent Owned
NSP-Wisconsin
Electric transmission:
La Crosse, WI to Madison, WI	$	177	$	20	37	%
CapX2020	166		34		80
Total NSP-Wisconsin (a)	$	343	$	54

(a)Projects additionally include $1 million in CWIP.

(Millions of Dollars, Except Percent Owned)	Plant in Service		Accumulated Depreciation		Percent Owned
PSCo
Electric generation:
Hayden Unit 1	$	157	$	99	76	%
Hayden Unit 2	151		81		37
Hayden common facilities	42		29		53
Craig Units 1 and 2	82		51		10
Craig common facilities	39		24		7
Comanche Unit 3	918		174		67
Comanche common facilities	28		3		82
Electric transmission:
Transmission and other facilities	186		72		Various
Gas transmission:
Rifle, CO to Avon, CO	25		9		60
Gas transmission compressor	8		2		50
Total PSCo (a)	$	1,636	$	544

(a)Projects additionally include $10 million in CWIP.

Each company’s share of operating expenses and construction expenditures is included in the applicable utility accounts. Respective owners are responsible for providing their own financing.