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Property, Plant and Equipment, Net | 12 Months Ended
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Dec. 31, 2012
Property, Plant and Equipment, Net [Abstract] |
Property, Plant and Equipment, Net | Property, Plant and Equipment, Net As of December 31, 2012 and 2011, the components of property, plant and equipment, are stated at cost less accumulated depreciation as follows (in millions):
| 2012 |  | 2011 |  | Depreciable Lives
Buildings, machinery and equipment | $ | 14,774 |  |  | $ | 15,074 |  |  | 3 – 47 Years
Geothermal properties | 1,243 |  |  | 1,163 |  |  | 13 – 59 Years
Other | 142 |  |  | 156 |  |  | 3 – 47 Years
| 16,159 |  |  | 16,393 |  |  |
Less: Accumulated depreciation | 4,390 |  |  | 4,158 |  |  |
| 11,769 |  |  | 12,235 |  |  |
Land | 98 |  |  | 91 |  |  |
Construction in progress | 1,138 |  |  | 693 |  |  |
Property, plant and equipment, net | $ | 13,005 |  |  | $ | 13,019 |  |  |
Total depreciation expense, including amortization of leased assets, recorded in income from operations and discontinued operations for the years ended December 31, 2012, 2011 and 2010, was $557 million, $560 million and $568 million, respectively. We have various debt instruments that are collateralized by our property, plant and equipment. See Note 6 for a detailed discussion of such instruments. Buildings, Machinery and Equipment This component primarily includes power plants and related equipment. Included in buildings, machinery and equipment are assets under capital leases. See Note 6 for further information regarding these assets under capital leases. Geothermal Properties This component primarily includes our Geysers Assets. Other This component primarily includes software and emission reduction credits that are power plant specific and not available to be sold. Capitalized Interest The total amount of interest capitalized was $38 million, $24 million and $15 million for the years ended December 31, 2012, 2011 and 2010, respectively.

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- Definition The entire disclosure for 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. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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