Property, Plant and Equipment, Net

12 Months Ended

Dec. 31, 2014

Property, Plant and Equipment, Net [Abstract]

As of December 31, 2014 and 2013, the components of property, plant and equipment are stated at cost less accumulated depreciation as follows (in millions):



	2014		2013		Depreciable Lives
Buildings, machinery and equipment	$	16,059	$	15,838	3 – 47 Years
Geothermal properties	1,294		1,265		13 – 59 Years
Other	203		164		3 – 47 Years
	17,556		17,267
Less: Accumulated depreciation	4,984		4,897
	12,572		12,370
Land	120		103
Construction in progress	498		522
Property, plant and equipment, net	$	13,190	$	12,995

We have various debt instruments that are collateralized by our property, plant and equipment. See Note 6 for a 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 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 $19 million, $38 million and $38 million for the years ended December 31, 2014, 2013 and 2012, respectively.

- 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.

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