Property Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

Public Utility Property, Plant, and Equipment

Major classes of property, plant and equipment

(Millions of Dollars)	Dec. 31, 2021		Dec. 31, 2020
Property, plant and equipment, net
Electric plant	$	19,154	$	18,948
Natural gas plant	1,864		1,707
Common and other property	1,007		955
Plant to be retired (a)	719		136
CWIP	984		1,150
Total property, plant and equipment	23,728		22,896
Less accumulated depreciation	(7,606)		(7,898)
Nuclear fuel	3,081		2,970
Less accumulated amortization	(2,773)		(2,660)
Property, plant and equipment, net	$	16,430	$	15,308

(a)Includes regulator-approved retirements of Sherco Units 1, 2 and 3 and A.S. King.

Schedule of Jointly Owned Utility Plants

Joint Ownership of Generation and Transmission Facilities

Jointly owned assets as of Dec. 31, 2021:

(Millions of Dollars, Except Percent Owned)	Plant in Service		Accumulated Depreciation		Percent Owned
Electric generation:
Sherco Unit 3	$	620	$	451	59	%
Sherco common facilities	178		108		80
Sherco substation	5		4		59
Electric transmission:
Grand Meadow	11		3		50
Huntley Wilmarth	48		1		50
CapX2020	952		127		51
Total (a)	$	1,814	$	694

(a)Projects additionally include $7 million in CWIP.