Jointly Owned Facilities (Tables)

12 Months Ended

Dec. 31, 2015

Jointly Owned Utility Plant, Net Ownership Amount [Abstract]

Schedule Of Jointly Owned Facilities

As of December 31, 2015, our interests in jointly-owned generating facilities and transmission systems included on our Balance Sheets were as follows (in thousands):

Interest in jointly-owned facilities	Plant in Service		Construction Work in Progress		Accumulated Depreciation
Wyodak Plant	$	111,532	$	1,039	$	56,812
Transmission Tie	$	19,648	$	—	$	5,390
Wygen III	$	137,860	$	446	$	16,217
Cheyenne Prairie	$	91,081	$	—	$	3,301