Property Plant and Equipment Property Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Public Utility Property, Plant, and Equipment

Major classes of property, plant and equipment

(Millions of Dollars)	Dec. 31, 2020		Dec. 31, 2019
Property, plant and equipment, net
Electric plant	$	9,229	$	8,453
Plant to be retired (a)	316		—
CWIP	146		486
Total property, plant and equipment	9,691		8,939
Less accumulated depreciation	(2,088)		(2,307)
Property, plant and equipment, net	$	7,603	$	6,632

(a)Includes expected retirement of Tolk and conversion of Harrington to natural gas.