Property, Plant and Equipment, Net

3 Months Ended

Mar. 31, 2012

Property, Plant and Equipment, Net [Abstract]

Property, Plant and Equipment Disclosure [Text Block]

(3) Property, Plant and Equipment, Net

Property, plant and equipment, net consists of the following (in millions):

		As of
	Depreciable	March 31,			December 31,
	Life	2012			2011
Regulated assets:
Utility generation, distribution and transmission system	5-80 years	$	40,608		$	40,180
Interstate pipeline assets	3-80 years	6,253			6,245
		46,861			46,425
Accumulated depreciation and amortization		(14,643		)	(14,390		)
Regulated assets, net		32,218			32,035
Nonregulated assets:
Independent power plants	5-30 years	677			677
Other assets	3-30 years	437			429
		1,114			1,106
Accumulated depreciation and amortization		(549		)	(533		)
Nonregulated assets, net		565			573
Net operating assets		32,783			32,608
Construction work-in-progress		2,045			1,559
Property, plant and equipment, net		$	34,828		$	34,167

Construction work-in-progress includes $1.8 billion and $1.6 billion as of March 31, 2012 and December 31, 2011, respectively, related to the construction of regulated assets.

The Company completed various acquisitions totaling $109 million during the three-month period ended March 31, 2012. The purchase price for each acquisition was allocated to the assets acquired, which relate primarily to development and construction costs for the 550-megawatt Topaz solar project ("Topaz Project") and the 81-megawatt Bishop Hill II wind-powered generation project. There were no material liabilities assumed.