Property, Plant and Equipment

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Property, plant and equipment as of December 31, 2023, consisted of:


As of December 31, 2023	Regulated		Nonregulated		Total
(Millions)
Electric generation, distribution, transmission and other	$	19,729	$	14,620	$	34,349
Natural gas transportation, distribution and other	5,751		14		5,765
Other common operating property	—		341		341
Total Property, Plant and Equipment in Service	25,480		14,975		40,455
Total accumulated depreciation	(6,742)		(5,737)		(12,479)
Total Net Property, Plant and Equipment in Service	18,738		9,238		27,976
Construction work in progress	2,902		1,979		4,881
Total Property, Plant and Equipment	$	21,640	$	11,217	$	32,857

Property, plant and equipment as of December 31, 2022, consisted of:


As of December 31, 2022	Regulated		Nonregulated		Total
(Millions)
Electric generation, distribution, transmission and other	$	18,634	$	14,096	$	32,730
Natural gas transportation, distribution and other	5,392		14		5,406
Other common operating property	—		317		317
Total Property, Plant and Equipment in Service	24,026		14,427		38,453
Total accumulated depreciation	(6,277)		(5,265)		(11,542)
Total Net Property, Plant and Equipment in Service	17,749		9,162		26,911
Construction work in progress	2,225		1,858		4,083
Total Property, Plant and Equipment	$	19,974	$	11,020	$	30,994

Capitalized interest costs were $115 million, $53 million and $33 million for the years ended December 31, 2023, 2022 and 2021, respectively. Accrued liabilities for property, plant and equipment additions were $653 million, $481 million and $297 million as of December 31, 2023, 2022 and 2021, respectively.

We impaired or wrote off amounts of $6 million, $11 million and $20 million for the years ended December 31, 2023, 2022 and 2021, respectively, resulting from reassessment of the economic feasibility of our various Renewables development projects under construction.

Depreciation expense for the years ended December 31, 2023, 2022 and 2021, amounted to $1,143 million, $1,071 million and $1,001 million, respectively.