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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment |
Property, Plant and Equipment | Note 2.Property, Plant and Equipment SCE's property, plant and equipment included in the consolidated balance sheets is composed of the following:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
(in millions) |  | 2021 |  | 2020
Distribution | ​ | $ | 30,821 | ​ | $ | 28,663
Transmission | ​ |  | 17,016 | ​ |  | 15,669
Generation | ​ |  | 3,769 | ​ |  | 3,709
General plant and other | ​ |  | 6,108 | ​ |  | 5,129
Accumulated depreciation | ​ |  | (11,407) | ​ |  | (10,681)
​ | ​ |  | 46,307 | ​ |  | 42,489
Construction work in progress | ​ |  | 4,067 | ​ |  | 5,033
Nuclear fuel, at amortized cost | ​ |  | 123 | ​ |  | 131
Total utility property, plant and equipment | ​ | $ | 50,497 | ​ | $ | 47,653
​ 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 the expected lives of the software, primarily ranging from 5 to 7 years and commencing upon operational use. Capitalized software costs, included in general plant and other above, were $2.0 billion and $1.2 billion at December 31, 2021 and 2020, respectively, and accumulated amortization was $0.6 billion and $0.6 billion, at December 31, 2021 and 2020, respectively. Amortization expense for capitalized software was $311 million, $218 million and $190 million in 2021, 2020 and 2019, respectively. At December 31, 2021, amortization expense is estimated to be $338 million, $310 million, $272 million, $220 million and $144 million for 2022 through 2026, 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, 2021:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Construction | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Plant in |  | Work in |  | Accumulated |  | Nuclear Fuel |  | Net Book |  | Ownership |
(in millions) | ​ | Service | ​ | Progress | ​ | Depreciation | ​ | (at amortized cost) | ​ | Value | ​ | Interest |
Transmission systems: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  |
Eldorado | ​ | $ | 336 | ​ | $ | 94 | ​ | $ | 49 | ​ | $ | — | ​ | $ | 381 | ​ | 86 | %
Pacific Intertie |  | ​ | 351 |  | ​ | 1 |  | ​ | 75 |  | ​ | — |  | ​ | 277 |  | 50 | %
Generating station: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  |  | ​
Palo Verde (nuclear) |  | ​ | 2,146 |  | ​ | 53 |  | ​ | 1,629 |  | ​ | 123 |  | ​ | 693 |  | 16 | %
Total | ​ | $ | 2,833 | ​ | $ | 148 | ​ | $ | 1,753 | ​ | $ | 123 | ​ | $ | 1,351 |  |  | ​
​ In addition to the jointly owned assets in the table above, SCE has ownership interests in jointly owned power poles with other companies.

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