Property Plant and Equipment Property Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2022

Property, Plant and Equipment [Abstract]

Public Utility Property, Plant, and Equipment

Major classes of property, plant and equipment

(Millions of Dollars)	Dec. 31, 2022		Dec. 31, 2021
Property, plant and equipment, net
Electric plant	$	15,771	$	16,543
Natural gas plant	5,949		5,471
Common and other property	1,415		1,224
Plant to be retired (a)	1,305		182
CWIP	877		681
Total property, plant and equipment	25,317		24,101
Less accumulated depreciation	(5,665)		(5,657)
Property, plant and equipment, net	$	19,652	$	18,444

(a)Amounts as of Dec. 31, 2021 include Comanche Units 1 and 2 and Craig Units 1 and 2. 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.

Schedule of Jointly Owned Utility Plants

Joint Ownership of Generation, Transmission and Gas Facilities

Jointly owned assets as of Dec. 31, 2022:

(Millions of Dollars, Except Percent Owned)	Plant in Service		Accumulated Depreciation		Percent Owned
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 (a)	$	1,636	$	544