Joint Ownership of Generation, Transmission and Gas Facilities (Tables)

12 Months Ended

Dec. 31, 2017

Joint Ownership of Generation, Transmission and Gas Facilities [Abstract]

Investments in Jointly Owned Generation, Transmission and Gas Facilities

Following are the investments by Xcel Energy Inc.’s utility subsidiaries in jointly owned generation, transmission and gas facilities and the related ownership percentages as of Dec. 31, 2017:

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Ownership %
NSP-Minnesota
Electric Generation:
Sherco Unit 3	$	612	$	411	$	1	59	%
Sherco Common Facilities Units 1, 2 and 3	145		99		1		80
Sherco Substation	5		3		—		59
Electric Transmission:
Grand Meadow Line and Substation	11		2		—		50
CapX2020 Transmission	1,039		138		2		51
Total NSP-Minnesota	$	1,812	$	653	$	4

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Ownership %
NSP-Wisconsin
Electric Transmission:
CapX2020 Transmission	$	162	$	12	$	103	81	%
La Crosse, Wis. to Madison, Wis.	—		—		102		37
Total NSP-Wisconsin	$	162	$	12	$	205

(Millions of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Ownership %
PSCo
Electric Generation:
Hayden Unit 1	$	150	$	72	$	1	76	%
Hayden Unit 2	149		65		—		37
Hayden Common Facilities	39		20		—		53
Craig Units 1 and 2	81		39		—		10
Craig Common Facilities 1, 2 and 3	39		20		—		7
Comanche Unit 3	890		118		—		67
Comanche Common Facilities	24		2		3		82
Electric Transmission:
Transmission and other facilities, including substations	177		67		1		Various
Gas Transportation:
Rifle, Colo. to Avon, Colo.	22		8		—		60
Gas Transportation Compressor	8		1		—		50
Total PSCo	$	1,579	$	412	$	5