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Property, Plant & Equipment | 12 Months Ended
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Dec. 31, 2011
PROPERTY, PLANT & EQUIPMENT | 3. PROPERTY, PLANT & EQUIPMENT The following table summarizes the components of the electric generation and distribution assets and other property, plant and equipment with their estimated useful lives:
|  | Estimated |  | December 31,
|  | Useful Life |  | 2011 |  | 2010
|  |  |  | (in millions)
Electric generation and distribution facilities |  | 5 - 69 yrs. |  | $ | 27,627 |  | $ | 23,133
Other buildings |  | 3 - 50 yrs. |  |  | 2,927 |  |  | 2,085
Furniture, fixtures and equipment |  | 3 - 31 yrs. |  |  | 481 |  |  | 484
Other |  | 1 - 46 yrs. |  |  | 913 |  |  | 812
Total electric generation and distribution assets and other |  |  |  |  | 31,948 |  |  | 26,514
Accumulated depreciation |  |  |  |  | (9,145) |  |  | (8,643)
Net electric generation and distribution assets and other(1) |  |  |  | $ | 22,803 |  | $ | 17,871
Net electric generation and distribution assets and other related to our businesses included in discontinued operations or held for sale of $622 million and $1.2 b illion as of December 31, 2011 and 2010, respectively, were excluded from the table above and were included in the noncurrent assets of discontinued and held for sale businesses. The amounts in the table above are stated net of impairment losses recognized as further discussed in Note 20—Impairment Expense. The following table summarizes interest capitalized during development and construction on qualifying assets for the years ended December 31, 2011, 2010 and 2009:
|  | 2011 |  | 2010 |  | 2009
|  | (in millions)
Interest capitalized during development and construction |  | $ | 176 |  | $ | 188 |  | $ | 183
Government subsidies and r ecoveries of liquidat ed damages from construction delays are reflected as a reduction in the related projects' construction costs. During 2011, the Company recovered liquidated damages of €139 million ($180 million) from the EPC contractor at Maritza, which were used to reduce the carrying amount of related plant and equipment. Approximately $13.5 billion of property, plant and equipment, net of accumulated depreciation, was mortgaged, pledged or subject to liens as of December 31, 2011. Depreciation expense, including the amortization of assets record ed under capital leases, was $1.2 b illion, $1.1 b illion and $891 million for the years ended December 31, 2011, 2010 and 2009, respectively. Net electric generation and distribution assets and other include unamortized internal use software costs of $157 million and $164 million as of December 31, 2011 and 2010, respectively. Amortization expense associated with software costs was $46 million, $50 million and $46 million for the years ended December 31, 2011, 2010 and 2009. The following table summarizes regulated and non-regulated generation and distribution property, plant and equipment and accumulated depreciation as of December 31, 2011 and 2010:
|  | 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 |  |  | 17,480 |  |  | 14,508
Non-regulated accumulated depreciation |  |  | (4,116) |  |  | (3,682)
Non-regulated generation, distribution assets, and other, net |  |  | 13,364 |  |  | 10,826
Net electric generation and distribution assets, and other |  | $ | 22,803 |  | $ | 17,871
The following table summarizes the amounts recognized, which were related to asset retirement obligations, for the years ended December 31, 2011 and 2010:
|  | 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
The Company's asset retirement obligations covered by the relevant guidance primarily include active ash landfills, water treatment basins and the removal or dismantlement of certain plant and equipment. The fair value of legally restricted assets for purposes of settling asset retirement obligations was $1 million at December 31, 2011. There were no legally restricted assets at December 31, 2010. Ownership o f Coal-Fired Facilities DP&L has undivided ownership interests in seven coal-fired generation facilities jointly owned with other utilities. As of December 31, 2011, DP&L had $48 million of construction work in process at such facilities. DP&L's share of the operating cost s of such facilities is included in Cost of Sales in the Consolidated Statement of Operations and its share of investment in the facilities is included in Property, Plant and Equipment in the Consolidated Balance Sheet. DP&L's undivided ownership interest in such facilities at December 31, 2011 is as follows:
|  |  | DP&L Share |  | DP&L Investment
|  |  |  |  | Production |  | Gross |  |  |  | Construction |
|  |  |  |  | Capacity |  | Plant |  | Accumulated |  | Work In |
|  |  | Ownership |  | (MW) |  | In Service |  | Depreciation |  | Process |
|  |  |  |  |  |  | ($ 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 |

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- Definition The entire disclosure for 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. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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