Property, Plant and Equipment

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Property, plant and equipment

Property, Plant and Equipment

The Company’s major classes of property, plant, and equipment were as follows:

	December 31, 2020		December 31, 2019		Depreciable Lives
	(In millions)
Facilities and equipment	$	9,254	$	7,676	2 - 45 Years
Land and improvements	224		173
Construction in progress (a)	62		94
Total property, plant and equipment	9,540		7,943
Accumulated depreciation	(2,323)		(1,880)
Net property, plant and equipment	$	7,217	$	6,063

(a) As of December 31, 2020 and 2019, construction in progress includes $14 million and $10 million of capital expenditures that relate to prepaid long-term service agreements in the Conventional segment, respectively.

    Depreciation expense related to property, plant and equipment during the years ended December 31, 2020, 2019 and 2018 was $420 million, $395 million and $330 million, respectively. The Company accelerated depreciation of the Pinnacle wind project in connection with the repowering project in 2020, which resulted in additional depreciation expense in the amount of $9 million. The Company accelerated depreciation of the Wildorado Wind and Elbow Creek projects in connection with the repowering project in 2019, which resulted in additional depreciation expense in the amount of $54 million.

The Company recorded long-lived asset impairments during the year ended December 31, 2020 and December 31, 2019, as further described in Note 9, Asset Impairments.