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Property, Plant & Equipment | 12 Months Ended
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Dec. 31, 2012
PROPERTY, PLANT & EQUIPMENT | 3. PROPERTY, PLANT AND 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. The amounts are stated net of impairment losses recognized as further discussed in Note 21—Asset I mpairment Expense.
|  | Estimated |  | December 31,
|  | Useful Life |  | 2012 |  | 2011
|  | (in years) |  | (in millions)
Electric generation and distribution facilities |  | 5 - 68 |  | $ | 27,586 |  | $ | 26,821
Other buildings |  | 3 - 50 |  |  | 2,840 |  |  | 2,924
Furniture, fixtures and equipment |  | 3 - 31 |  |  | 472 |  |  | 476
Other |  | 1 - 46 |  |  | 939 |  |  | 847
Total electric generation and distribution assets and other |  |  |  |  | 31,837 |  |  | 31,068
Accumulated depreciation |  |  |  |  | (9,723) |  |  | (8,944)
Net electric generation and distribution assets and other(1)(2) |  |  |  | $ | 22,114 |  | $ | 22,124
Net electric generation and distribution assets and other related to our held for sale businesses of $1.2 b illion as of December 31, 2011, were excluded from the table above and were included in the noncurrent assets of discontinued and held for sale businesses in the consolidated balance sheet. There were no amounts excluded as of December 31, 2012. Net electric generation and distribution assets, and other include unamortized internal use software costs of $153 million and $156 million as of December 31, 2012 and 2011, respectively. 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 years ended December 31, 2012, 2011 and 2010:
|  |  | 2012 |  | 2011 |  | 2010
|  |  | (in millions)
Depreciation expense (including amortization of assets |  |  |  |  |  |  |  |  |
| recorded under capital leases) |  | $ | 1,251 |  | $ | 1,154 |  | $ | 1,010
Amortization of internal use software |  |  | 48 |  |  | 46 |  |  | 50
Interest capitalized during development and construction |  |  | 111 |  |  | 176 |  |  | 188
P roperty, plant and equipment, net of accumulated depreciation, of $16.0 billion and $15.2 billion was mortgaged, pledged or subject to liens as of December 31, 2012 and 2011, respectively. The following table summarizes regulated and non-regulated generation and distribution property, plant and equipment and accumulated depreciation as of December 31, 2012 and 2011:
|  | December 31,
|  | 2012 |  | 2011
|  | (in millions)
Regulated assets |  | $ | 14,650 |  | $ | 14,398
Regulated accumulated depreciation |  |  | (5,221) |  |  | (5,029)
Regulated generation, distribution assets and other, net |  |  | 9,429 |  |  | 9,369
Non-regulated assets |  |  | 17,187 |  |  | 16,670
Non-regulated accumulated depreciation |  |  | (4,502) |  |  | (3,915)
Non-regulated generation, distribution assets and other, net |  |  | 12,685 |  |  | 12,755
Net electric generation and distribution assets and other |  | $ | 22,114 |  | $ | 22,124
The following table summarizes the amounts recognized, which were related to asset retirement obligations, for the years ended December 31, 2012 and 2011:
|  | 2012 |  | 2011
|  | (in millions)
Balance at January 1 |  | $ | 117 |  | $ | 88
Additional liabilities incurred |  |  | 3 |  |  | 1
Assumed in business combination |  |  | - |  |  | 24
Liabilities settled |  |  | (3) |  |  | -
Accretion expense |  |  | 7 |  |  | 6
Change in estimated cash flows |  |  | 3 |  |  | (1)
Translation adjustments |  |  | 1 |  |  | (1)
Balance at December 31 |  | $ | 128 |  | $ | 117
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. There were no legally restricted assets for purposes of settling asset retirement o bligations at December 31, 2012. The fair value of legally restricted assets for purposes of settling asset retirement obligations was $1 million at December 31, 2011. 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, 2012, DP&L had $36 million of construction work in process at such facilities. DP&L's share of the operating cost s of such facilities is included in Cost of Sales in the Consolidated Statement of Operations and its share of investment in the facilities is included in Property, Plant and Equipment in the Consolidated Balance Sheet. DP&L's undivided ownership interest in such facilities at December 31, 2012 is as follows:
|  |  | DP&L Share |  | DP&L Investment
|  |  |  |  | Production |  | Gross |  |  |  | Construction |
|  |  |  |  | Capacity |  | Plant |  | Accumulated |  | Work In |
|  |  | Ownership |  | (MW) |  | In Service |  | Depreciation |  | Process |
|  |  |  |  |  |  | ($ in millions) |
Production units: |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Beckjord Unit 6 |  | 50% |  | 207 |  | $ | - |  | $ | - |  | $ | - |
| Conesville Unit 4 |  | 17% |  | 129 |  |  | 41 |  |  | 3 |  |  | 11 |
| East Bend Station |  | 31% |  | 186 |  |  | 8 |  |  | 2 |  |  | 3 |
| Killen Station |  | 67% |  | 402 |  |  | 299 |  |  | - |  |  | 5 |
| Miami Fort Units 7 and 8 |  | 36% |  | 368 |  |  | 213 |  |  | 7 |  |  | 3 |
| Stuart Station |  | 35% |  | 808 |  |  | 200 |  |  | 6 |  |  | 12 |
| Zimmer Station |  | 28% |  | 365 |  |  | 169 |  |  | 12 |  |  | 2 |
Transmission |  | various |  | - |  |  | 39 |  |  | 3 |  |  | - |
| Total |  |  |  | 2,465 |  | $ | 969 |  | $ | 33 |  | $ | 36 |

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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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