Property Plant and Equipment Property Plant and Equipment

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Disclosure

Major classes of property, plant and equipment


(Millions of Dollars)	Dec. 31, 2023		Dec. 31, 2022
Property, plant and equipment, net
Electric plant	$	52,494	$	49,639
Natural gas plant	9,080		8,514
Common and other property	3,190		2,970
Plant to be retired (a)	2,055		2,217
CWIP	2,873		2,124
Total property, plant and equipment	69,692		65,464
Less accumulated depreciation	(18,399)		(17,502)
Nuclear fuel	3,337		3,183
Less accumulated amortization	(2,988)		(2,892)
Property, plant and equipment, net	$	51,642	$	48,253

(a)Amounts include Sherco 1 and 3 and A.S. King for NSP-Minnesota; Comanche Units 2 and 3, Craig Units 1 and 2, Hayden Units 1 and 2 and coal generation assets at Pawnee pending facility gas conversion for PSCo; and Tolk Unit 1 and 2 and coal generation assets at Harrington pending facility gas conversion for SPS. The Dec. 31, 2022 balance also includes Sherco 2, which was retired on Dec. 31, 2023. 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, 2023:


(Millions of Dollars, Except Percent Owned)	Plant in Service		Accumulated Depreciation		Percent Owned
NSP-Minnesota
Electric generation:
Sherco Unit 3	$	633	$	480	59	%
Sherco common facilities	185		121		80
Sherco substation	5		4		59
Electric transmission:
Grand Meadow	11		4		50
Huntley Wilmarth	49		2		50
CapX2020	820		141		51
Total NSP-Minnesota (a)	$	1,703	$	752

(a)Projects additionally include $2 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	$	178	$	25	37	%
CapX2020	169		39		80
Total NSP-Wisconsin (a)	$	347	$	64

(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	$	108	76	%
Hayden Unit 2	151		87		37
Hayden common facilities	44		31		53
Craig Units 1 and 2	82		55		10
Craig common facilities	39		25		7
Comanche Unit 3	916		191		67
Comanche common facilities	29		4		77
Electric transmission:
Transmission and other facilities	189		75		Various
Gas transmission:
Rifle, CO to Avon, CO	28		9		60
Gas transmission compressor	8		2		50
Total PSCo (a)	$	1,643	$	587

(a)Projects additionally include $18 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.