v3.19.1

Property, Plant and Equipment, Net | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment, Net [Abstract] |
Property, Plant and Equipment, Net | Property, Plant and Equipment, Net As of December 31, 2018 and 2017, the components of property, plant and equipment are stated at cost less accumulated depreciation as follows (in millions):
| 2018 |  | 2017 |  | Depreciable Lives
Buildings, machinery and equipment | $ | 16,400 |  |  | $ | 16,506 |  |  | 1.5 – 46 Years
Geothermal properties | 1,501 |  |  | 1,494 |  |  | 13 – 58 Years
Other | 286 |  |  | 236 |  |  | 3 – 46 Years
| 18,187 |  |  | 18,236 |  |  |
Less: Accumulated depreciation | 6,832 |  |  | 6,383 |  |  |
| 11,355 |  |  | 11,853 |  |  |
Land | 121 |  |  | 117 |  |  |
Construction in progress | 966 |  |  | 754 |  |  |
Property, plant and equipment, net | $ | 12,442 |  |  | $ | 12,724 |  |  |
Total depreciation expense, including amortization of capital lease assets, recorded for the years ended December 31, 2018, 2017 and 2016, was $684 million, $638 million and $628 million, respectively. We have various debt instruments that are collateralized by our property, plant and equipment. See Note 8 for a discussion of such instruments. Depreciable Lives — During the fourth quarter of 2017, we reviewed our accounting policies related to depreciation associated with our estimates of useful lives related to our componentized balance of plant parts. During the first quarter of 2018, we reviewed our accounting policies related to depreciation associated with our estimates of useful lives related to our rotable parts. As a result, the useful lives of our componentized balance of plant parts are now generally estimated to range from 6 to 25 years and the useful lives of our rotable parts are now generally estimated to range from 1.5 to 12 years. Our change in the estimated useful lives for componentized balance of plant parts and rotable parts is considered a change in accounting estimate and will result in changes to our depreciation expense prospectively. The change in estimate resulted in a (decrease) to our net income attributable to Calpine of $(24) million for the year ended December 31, 2018. 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 8 for further information regarding these assets under capital leases. Geothermal Properties This component primarily includes power plants and related equipment associated with 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 $29 million, $26 million and $21 million for the years ended December 31, 2018, 2017 and 2016, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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