Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2014

Property, Plant and Equipment [Abstract]

Property, Pland and Equipment with Useful Life Classification

The following table summarizes the components of the electric generation and distribution assets and other property, plant and equipment with their estimated useful lives. The amounts are stated net of impairment losses recognized as further discussed in Note 21—Asset Impairment Expense.



	Estimated Useful Life	December 31,
	Estimated Useful Life	2014			2013
	(in years)	(in millions)
Electric generation and distribution facilities	5 - 68	$	27,488		$	27,619
Other buildings	5 - 53	1,694			1,726
Furniture, fixtures and equipment	2 - 31	307			312
Other	1 - 50	970			939
Total electric generation and distribution assets and other		30,459			30,596
Accumulated depreciation		(9,962		)	(9,604		)
Net electric generation and distribution assets and other⁽¹⁾⁽²⁾		$	20,497		$	20,992


⁽¹⁾	Net electric generation and distribution assets and other related to the Company's held-for-sale businesses of $1.2 billion as of December 31, 2013, were excluded from the table above and were included in the noncurrent assets of discontinued and held-for-sale businesses in the consolidated balance sheets. There were no discontinued and held-for-sale businesses at December 31, 2014.


⁽²⁾	Net electric generation and distribution assets and other include unamortized internal-use software costs of $115 million and $133 million as of December 31, 2014 and 2013, respectively.

Interest Capitalized During Development And Construction

The following table summarizes depreciation expense (including the amortization of assets recorded under capital leases), amortization of internal-use software and interest capitalized during development and construction on qualifying assets for the periods indicated:



	December 31,
	2014		2013		2012
	(in millions)
Depreciation expense (including amortization of assets recorded under capital leases)	$	1,204	$	1,193	$	1,173
Amortization of internal-use software	33		36		45
Interest capitalized during development and construction	120		84		88

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

The following table summarizes regulated and non-regulated generation and distribution property, plant and equipment and accumulated depreciation as of the periods indicated:



	December 31,
	2014			2013
	(in millions)
Regulated generation, distribution assets and other, gross	$	13,103		$	13,031
Regulated accumulated depreciation	(4,841		)	(4,732		)
Regulated generation, distribution assets and other, net	8,262			8,299
Non-regulated generation, distribution assets and other, gross	17,356			17,565
Non-regulated accumulated depreciation	(5,121		)	(4,872		)
Non-regulated generation, distribution assets and other, net	12,235			12,693
Net electric generation and distribution assets and other	$	20,497		$	20,992

Schedule of Change in Asset Retirement Obligation

The following table summarizes the amounts recognized related to asset retirement obligations for the periods indicated:



	December 31,
	2014			2013
	(in millions)
Balance at January 1	$	142		$	120
Additional liabilities incurred	51			1
Liabilities settled	(11		)	(4		)
Accretion expense	12			9
Change in estimated cash flows	15			16
Balance at December 31	$	209		$	142

Schedule of Jointly Owned Utility Plants

DP&L’s undivided ownership interest in such facilities at December 31, 2014 is as follows:



	DP&L Share			DP&L Investment
	Ownership		Production Capacity (MW)	Gross Plant In Service		Accumulated Depreciation		Construction Work In Process
Production units:				($ in millions)
Conesville Unit 4	17	%	129	$	24	$	2	$	1
Killen Station	67	%	402	308		19		2
Miami Fort Units 7 and 8	36	%	368	214		23		2
Stuart Station	35	%	808	219		16		14
Zimmer Station	28	%	365	182		35		6
Transmission	various		—	42		6		—
Total			2,072	$	989	$	101	$	25

- 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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