Property Plant and Equipment Property Plant and Equipment

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Disclosure

Major classes of property, plant and equipment

(Millions of Dollars)	Dec. 31, 2019			Dec. 31, 2018
Property, plant and equipment
Electric plant	$	44,355		$	41,472
Natural gas plant	6,560			6,210
Common and other property	2,341			2,154
Plant to be retired (a)	259			322
CWIP	2,329			2,091
Total property, plant and equipment	55,844			52,249
Less accumulated depreciation	(16,735		)	(15,659		)
Nuclear fuel	2,909			2,771
Less accumulated amortization	(2,535		)	(2,417		)
Property, plant and equipment, net	$	39,483		$	36,944

^(a)  In 2018, the CPUC approved early retirement of PSCo’s Comanche Units 1 and 2 in approximately 2022 and 2025, respectively. PSCo also expects Craig Unit 1 to be retired early in 2025.  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, 2019:

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Percent Owned
NSP-Minnesota
Electric generation:
Sherco Unit 3	$	603	$	426	$	4	59	%
Sherco common facilities	145		103		2		80
Sherco substation	5		3		—		59
Electric transmission:
CapX2020	972		92		2		51
Grand Meadow	11		3		—		50
Total NSP-Minnesota	$	1,736	$	627	$	8

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Percent Owned
NSP-Wisconsin
Electric transmission:
La Crosse, WI to Madison, WI	$	187	$	7	$	—	37	%
CapX2020	169		19		—		80
Total NSP-Wisconsin	$	356	$	26	$	—

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Percent Owned
PSCo
Electric generation:
Hayden Unit 1	$	152	$	81	$	—	76	%
Hayden Unit 2	149		71		—		37
Hayden common facilities	41		22		—		53
Craig Units 1 and 2	81		41		—		10
Craig common facilities	39		22		—		7
Comanche Unit 3	887		149		1		67
Comanche common facilities	29		3		—		82
Electric transmission:
Transmission and other facilities	174		62		1		Various
Gas transmission:
Rifle, CO to Avon, CO	22		7		—		60
Gas transmission compressor	9		1		—		50
Total PSCo	$	1,583	$	459	$	2

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.