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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
SCE's utility property, plant and equipment included in the consolidated balance sheets is composed of the following:
December 31,
(in millions)20242023
Distribution$37,093 $34,573 
Transmission19,189 18,526 
Generation4,217 3,593 
General plant and other7,046 6,383 
Accumulated depreciation(14,207)(12,910)
53,338 50,165 
Construction work in progress5,585 5,590 
Nuclear fuel, at amortized cost124 122 
Total utility property, plant and equipment$59,047 $55,877 
Capitalized Software Costs
SCE capitalizes costs incurred during the application development stage of internal use software projects to property, plant and equipment. SCE amortizes capitalized software costs ratably over their useful lives, primarily 5 and 7 year lives, commencing upon operational use. Capitalized software costs, included in general plant and other above, was $2.5 billion and $2.1 billion at December 31, 2024 and 2023, respectively, and accumulated amortization was $1.1 billion and $0.9 billion, at December 31, 2024 and 2023, respectively. Amortization expense for capitalized software was $416 million, $358 million, and $344 million in 2024, 2023, and 2022, respectively. At December 31, 2024, amortization expense is estimated to be $428 million, $371 million, $288 million, $186 million, and $72 million for 2025 through 2029, respectively.
Jointly Owned Utility Projects
SCE owns undivided interests in transmission and generating assets for which each participant provides its own financing. SCE's proportionate share of these assets is reflected in the consolidated balance sheets and included in the above table. SCE's proportionate share of expenses for each project is reflected in the consolidated statements of income.
The following is SCE's investment in each asset as of December 31, 2024:
(in millions)Plant in
Service		Construction
Work in
Progress		Accumulated
Depreciation		Nuclear Fuel
(at amortized cost)		TotalOwnership
Interest
Transmission systems:
Eldorado$448 $40 $(71)$— $417 71 %
Pacific Intertie356 8 (121)— 243 50 %
Generating station:
Palo Verde (nuclear)2,249 62 (1,694)124 741 16 %
Total$3,053 $110 $(1,886)$124 $1,401 
In addition to the jointly owned assets in the table above, SCE has ownership interests in jointly owned power poles with other companies.