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Property Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2011

Property Plant And Equipment Tables [Abstract]

	Estimated	December 31,
	Useful Life	2011		2010

		(in millions)
Electric generation and distribution facilities	5 - 69 yrs.	$	26,905	$	22,365
Other buildings	3 - 50 yrs.		2,924		2,082
Furniture, fixtures and equipment	3 - 31 yrs.		476		479
Other	1 - 46 yrs.		838		761
Total electric generation and distribution assets and other			31,143		25,687
Accumulated depreciation			(8,944)		(8,447)
Net electric generation and distribution assets and other⁽¹⁾		$	22,199	$	17,240

Interest Capitalized During Development And Construction


	2011		2010		2009

	(in millions)
Interest capitalized during development and construction	$	176	$	188	$	183

Net Asset Value Of Regulated And Non-Regulated Assets And Accumulated Depreciation

	December 31,
	2011		2010

	(in millions)
Regulated assets	$	14,468	$	12,006
Regulated accumulated depreciation		(5,029)		(4,961)
Regulated generation, distribution assets, and other, net		9,439		7,045
Non-regulated assets		16,675		13,681
Non-regulated accumulated depreciation		(3,915)		(3,486)
Non-regulated generation, distribution assets, and other, net		12,760		10,195
Net electric generation and distribution assets, and other	$	22,199	$	17,240

Schedule of Change in Asset Retirement Obligation [Table Text Block]

	2011		2010

	(in millions)
Balance at January 1	$	88	$	60
Additional liabilities incurred		1		22
Assumed in business combination		24		-
Accretion expense		6		5
Change in estimated cash flows		(1)		1
Translation adjustments		(1)		-
Balance at December 31	$	117	$	88

Schedule of Jointly Owned Utility Plants [Table Text Block]

		DP&L Share		DP&L Investment

			Production	Gross				Construction
			Capacity	Plant		Accumulated		Work In
		Ownership	(MW)	In Service		Depreciation		Process

				($ in millions)

Production Units:
	Beckjord Unit 6	50%	210	$	-	$	-	$	-
	Conesville Unit 4	17%	129		-		-		2
	East Bend Station	31%	186		-		-		2
	Killen Station	67%	402		331		-		4
	Miami Fort Units 7 and 8	36%	368		239		1		2
	Stuart Station	35%	820		181		1		14
	Zimmer Station	28%	365		161		2		24
Transmission		various			34		-		-
	Total		2,480	$	946	$	4	$	48

- 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.

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- Definition

Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants.

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