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

12 Months Ended

Dec. 31, 2016

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

Investments in Jointly Owned Generation, Transmission and Gas Facilities

Following are the investments by PSCo in jointly owned generation, transmission and gas facilities and the related ownership percentages as of Dec. 31, 2016:

(Thousands of Dollars)	Plant in Service		Accumulated Depreciation		CWIP		Ownership %
Electric Generation:
Hayden Unit 1	$	149,221	$	67,415	$	97	76	%
Hayden Unit 2	148,795		64,024		64		37
Hayden Common Facilities	38,230		18,951		282		53
Craig Units 1 and 2	60,318		37,570		15,730		10
Craig Common Facilities 1, 2 and 3	37,925		19,312		183		7
Comanche Unit 3	892,978		112,254		6		67
Comanche Common Facilities	24,694		1,821		636		82
Electric Transmission:
Transmission and other facilities, including substations	166,840		65,619		4,313		Various
Gas Transportation:
Rifle, Colo. to Avon, Colo.	23,406		7,679		—		60
Gas Transportation Compressor	8,397		368		—		50
Total	$	1,550,804	$	395,013	$	21,311