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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2011
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment Utility Property, Plant and Equipment Utility property, plant and equipment included on the consolidated balance sheets is composed of the following:
|  | December 31,
(in millions) |  | 2011 |  | 2010
Transmission |  | $ | 6,109 |  |  | $ | 5,811 |
Distribution |  | 15,938 |  |  | 14,878 |
Generation |  | 4,063 |  |  | 3,371 |
General plant and other |  | 3,951 |  |  | 3,377 |
Accumulated depreciation |  | (6,894 | ) |  | (6,319 | )
|  | 23,167 |  |  | 21,118 |
Construction work in progress |  | 3,922 |  |  | 3,291 |
Nuclear fuel, at amortized cost |  | 480 |  |  | 369 |
Total utility property, plant and equipment |  | $ | 27,569 |  |  | $ | 24,778 |
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, ranging from 5 to 15 years and commencing upon operational use. At December 31, 2011 and 2010, capitalized software costs were $1.4 billion and $1.1 billion and accumulated amortization was $491 million and $393 million, respectively. Amortization expense for capitalized software was $156 million, $129 million and $88 million in 2011, 2010 and 2009, respectively. At December 31, 2011, amortization expense is estimated to be approximately $174 million annually for 2012 through 2016. Jointly Owned Utility Projects SCE owns interests in several generating stations and transmission systems for which each participant provides its own financing. SCE's proportionate share of these projects 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. All of the investments in the Mohave generating station and a portion of the investments in San Onofre and Palo Verde generating stations are included in regulatory assets on the consolidated balance sheets—see Note 14. The following is SCE's investment in each project as of December 31, 2011:
(in millions) |  | Plant in Service | Construction Work in Progress | Accumulated Depreciation | Nuclear Fuel (at amortized cost) | Net Book Value |  | Ownership Interest
Transmission systems: |  |  |  |  |  |  |  |
Eldorado |  | $ | 71 |  | $ | 4 |  | $ | 13 |  | $ | — |  | $ | 62 |  |  | 60%
Pacific Intertie |  | 189 |  | 2 |  | 68 |  | — |  | 123 |  |  | 50%
Generating stations: |  |  |  |  |  |  |  |
Four Corners Units 4 and 5 (coal) |  | 589 |  | 17 |  | 519 |  | — |  | 87 |  |  | 48%
Mohave (coal) |  | 327 |  | 24 |  | 287 |  | — |  | 64 |  |  | 56%
Palo Verde (nuclear) |  | 1,803 |  | 54 |  | 1,465 |  | 138 |  | 530 |  |  | 16%
San Onofre (nuclear) |  | 5,198 |  | 370 |  | 4,111 |  | 342 |  | 1,799 |  |  | 78%
Total |  | $ | 8,177 |  | $ | 471 |  | $ | 6,463 |  | $ | 480 |  | $ | 2,665 |  |  |
In addition to the projects above, SCE has ownership interests in jointly owned power poles with other companies. On November 8, 2010, SCE entered into an agreement to sell its ownership interest in Units 4 and 5 of the Four Corners coal-fired electric generating facility to the operator of the facility, Arizona Public Service Company. The sale price is $294 million, subject to certain adjustments. The closing of the sale is contingent upon the receipt of regulatory approvals and other specified closing conditions and is estimated to occur in the second half of 2012. Any gain on sale will be for the benefit of SCE's customers and, therefore, will not affect SCE's earnings.

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- Definition Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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