Property, Plant and Equipment |
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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:
(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.
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