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Leases (Tables)
 12 Months Ended
Dec. 31, 2012
Lease Rental Costs
  Years Ended December 31,
Lease Rental Costs 2012 2011 2010
  (in millions)
Net Lease Expense on Operating Leases $ 346 $ 343 $ 343
Amortization of Capital Leases   73   72   97
Interest on Capital Leases   29   32   26
Total Lease Rental Costs $ 448 $ 447 $ 466
Property, Plant and Equipment and Related Obligations Under Capital Leases
   December 31,
 Property, Plant and Equipment Under Capital Leases 2012 2011
   (in millions)
 Generation $ 117 $ 104
 Other Property, Plant and Equipment   495   485
 Total Property, Plant and Equipment Under Capital Leases   612   589
 Accumulated Amortization   173   137
 Net Property, Plant and Equipment Under Capital Leases $ 439 $ 452
         
 Obligations Under Capital Leases      
 Noncurrent Liability $ 375 $ 384
 Liability Due Within One Year   74   74
 Total Obligations Under Capital Leases $ 449 $ 458
Future Minimum Lease Payments
     Noncancelable
 Future Minimum Lease Payments Capital Leases Operating Leases
    (in millions)
 2013 $ 95 $ 302
 2014   79   275
 2015   65   257
 2016   59   233
 2017   63   219
 Later Years   244   1,034
 Total Future Minimum Lease Payments   605 $ 2,320
 Less Estimated Interest Element   156   
 Estimated Present Value of Future Minimum      
  Lease Payments $ 449   
Future Minimum Lease Payments of Rockport Lease
 Future Minimum Lease Payments AEGCo I&M
    (in millions)
 2013 $ 74 $ 74
 2014   74   74
 2015   74   74
 2016   74   74
 2017   74   74
 Later Years   369   369
 Total Future Minimum Lease Payments $ 739 $ 739
Appalachian Power Co [Member]
  
Lease Rental Costs
Year Ended December 31, 2012 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Net Lease Expense on Operating Leases $ 15,633 $ 95,509 $ 59,836 $ 5,283 $ 5,797
Amortization of Capital Leases   7,429   8,429   10,906   3,839   14,793
Interest on Capital Leases   1,782   1,738   3,307   815   9,041
Total Lease Rental Costs $ 24,844 $ 105,676 $ 74,049 $ 9,937 $ 29,631
                
Year Ended December 31, 2011 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Net Lease Expense on Operating Leases $ 13,488 $ 94,317 $ 59,983 $ 6,532 $ 5,990
Amortization of Capital Leases   7,880   8,762   13,118   4,438   12,694
Interest on Capital Leases   1,898   2,115   3,753   1,098   9,651
Total Lease Rental Costs $ 23,266 $ 105,194 $ 76,854 $ 12,068 $ 28,335
                
Year Ended December 31, 2010 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Net Lease Expense on Operating Leases $ 18,034 $ 91,973 $ 62,887 $ 2,649 $ 5,877
Amortization of Capital Leases   7,002   31,178   12,069   3,992   11,742
Interest on Capital Leases   1,598   2,298   3,132   1,057   9,892
Total Lease Rental Costs $ 26,634 $ 125,449 $ 78,088 $ 7,698 $ 27,511
Property, Plant and Equipment and Related Obligations Under Capital Leases
December 31, 2012 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Property, Plant and Equipment Under               
 Capital Leases:               
Generation $ 11,798 $ 19,102 $ 39,080 $ 3,624 $ 27,745
Other Property, Plant and Equipment   20,944   22,697   35,666   15,614   154,166
Total Property, Plant and Equipment   32,742   41,799   74,746   19,238   181,911
Accumulated Amortization   10,282   13,154   27,513   6,738   50,440
Net Property, Plant and Equipment               
 Under Capital Leases $ 22,460 $ 28,645 $ 47,233 $ 12,500 $ 131,471
                 
Obligations Under Capital Leases:               
Noncurrent Liability $ 16,375 $ 22,842 $ 36,381 $ 8,864 $ 114,161
Liability Due Within One Year   6,085   5,803   14,707   3,636   17,599
                 
Total Obligations Under Capital Leases $ 22,460 $ 28,645 $ 51,088 $ 12,500 $ 131,760

December 31, 2011 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Property, Plant and Equipment Under               
 Capital Leases:               
Generation $ 11,712 $ 16,100 $ 36,689 $ 3,617 $ 20,453
Other Property, Plant and Equipment   25,201   27,712   36,264   16,441   145,273
Total Property, Plant and Equipment   36,913   43,812   72,953   20,058   165,726
Accumulated Amortization   9,886   12,779   22,075   5,196   38,163
Net Property, Plant and Equipment               
 Under Capital Leases $ 27,027 $ 31,033 $ 50,878 $ 14,862 $ 127,563
                 
Obligations Under Capital Leases:               
Noncurrent Liability $ 19,293 $ 23,117 $ 40,152 $ 11,101 $ 112,802
Liability Due Within One Year   7,734   7,916   14,096   3,761   15,058
                 
Total Obligations Under Capital Leases $ 27,027 $ 31,033 $ 54,248 $ 14,862 $ 127,860
Future Minimum Lease Payments
Capital Leases APCo I&M OPCo PSO SWEPCo
  (in thousands)
2013 $ 6,988 $ 6,827 $ 13,669 $ 4,222 $ 25,706
2014   4,596   5,649   10,371   3,149   23,702
2015   3,849   4,279   7,383   1,921   21,585
2016   3,372   3,504   6,743   1,636   18,728
2017   2,809   3,344   6,322   1,646   20,103
Later Years   3,748   11,781   17,905   1,709   60,112
Total Future Minimum Lease               
 Payments   25,362   35,384   62,393   14,283   169,936
Less Estimated Interest Element   2,902   6,739   11,305   1,782   38,176
Estimated Present Value of Future               
 Minimum Lease Payments $ 22,460 $ 28,645 $ 51,088 $ 12,501 $ 131,760
                 
Noncancelable Operating Leases APCo I&M OPCo PSO SWEPCo
  (in thousands)
2013 $ 15,693 $ 98,719 $ 58,968 $ 2,383 $ 5,893
2014   13,959   98,673   55,261   1,858   4,279
2015   11,054   97,266   52,287   1,524   3,672
2016   10,270   89,872   46,002   1,231   3,030
2017   9,819   84,142   42,678   1,048   2,681
Later Years   47,613   423,279   68,094   1,723   10,297
Total Future Minimum Lease               
 Payments $ 108,408 $ 891,951 $ 323,290 $ 9,767 $ 29,852
Maximum Potential Loss
   Maximum 
 Company Potential Loss 
   (in thousands) 
 APCo $ 3,463 
 I&M   2,432 
 OPCo   4,003 
 PSO   1,171 
 SWEPCo   2,405 
Indiana Michigan Power Co [Member]
  
Lease Rental Costs
Year Ended December 31, 2012 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Net Lease Expense on Operating Leases $ 15,633 $ 95,509 $ 59,836 $ 5,283 $ 5,797
Amortization of Capital Leases   7,429   8,429   10,906   3,839   14,793
Interest on Capital Leases   1,782   1,738   3,307   815   9,041
Total Lease Rental Costs $ 24,844 $ 105,676 $ 74,049 $ 9,937 $ 29,631
                
Year Ended December 31, 2011 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Net Lease Expense on Operating Leases $ 13,488 $ 94,317 $ 59,983 $ 6,532 $ 5,990
Amortization of Capital Leases   7,880   8,762   13,118   4,438   12,694
Interest on Capital Leases   1,898   2,115   3,753   1,098   9,651
Total Lease Rental Costs $ 23,266 $ 105,194 $ 76,854 $ 12,068 $ 28,335
                
Year Ended December 31, 2010 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Net Lease Expense on Operating Leases $ 18,034 $ 91,973 $ 62,887 $ 2,649 $ 5,877
Amortization of Capital Leases   7,002   31,178   12,069   3,992   11,742
Interest on Capital Leases   1,598   2,298   3,132   1,057   9,892
Total Lease Rental Costs $ 26,634 $ 125,449 $ 78,088 $ 7,698 $ 27,511
Property, Plant and Equipment and Related Obligations Under Capital Leases
December 31, 2012 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Property, Plant and Equipment Under               
 Capital Leases:               
Generation $ 11,798 $ 19,102 $ 39,080 $ 3,624 $ 27,745
Other Property, Plant and Equipment   20,944   22,697   35,666   15,614   154,166
Total Property, Plant and Equipment   32,742   41,799   74,746   19,238   181,911
Accumulated Amortization   10,282   13,154   27,513   6,738   50,440
Net Property, Plant and Equipment               
 Under Capital Leases $ 22,460 $ 28,645 $ 47,233 $ 12,500 $ 131,471
                 
Obligations Under Capital Leases:               
Noncurrent Liability $ 16,375 $ 22,842 $ 36,381 $ 8,864 $ 114,161
Liability Due Within One Year   6,085   5,803   14,707   3,636   17,599
                 
Total Obligations Under Capital Leases $ 22,460 $ 28,645 $ 51,088 $ 12,500 $ 131,760

December 31, 2011 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Property, Plant and Equipment Under               
 Capital Leases:               
Generation $ 11,712 $ 16,100 $ 36,689 $ 3,617 $ 20,453
Other Property, Plant and Equipment   25,201   27,712   36,264   16,441   145,273
Total Property, Plant and Equipment   36,913   43,812   72,953   20,058   165,726
Accumulated Amortization   9,886   12,779   22,075   5,196   38,163
Net Property, Plant and Equipment               
 Under Capital Leases $ 27,027 $ 31,033 $ 50,878 $ 14,862 $ 127,563
                 
Obligations Under Capital Leases:               
Noncurrent Liability $ 19,293 $ 23,117 $ 40,152 $ 11,101 $ 112,802
Liability Due Within One Year   7,734   7,916   14,096   3,761   15,058
                 
Total Obligations Under Capital Leases $ 27,027 $ 31,033 $ 54,248 $ 14,862 $ 127,860
Future Minimum Lease Payments
Capital Leases APCo I&M OPCo PSO SWEPCo
  (in thousands)
2013 $ 6,988 $ 6,827 $ 13,669 $ 4,222 $ 25,706
2014   4,596   5,649   10,371   3,149   23,702
2015   3,849   4,279   7,383   1,921   21,585
2016   3,372   3,504   6,743   1,636   18,728
2017   2,809   3,344   6,322   1,646   20,103
Later Years   3,748   11,781   17,905   1,709   60,112
Total Future Minimum Lease               
 Payments   25,362   35,384   62,393   14,283   169,936
Less Estimated Interest Element   2,902   6,739   11,305   1,782   38,176
Estimated Present Value of Future               
 Minimum Lease Payments $ 22,460 $ 28,645 $ 51,088 $ 12,501 $ 131,760
                 
Noncancelable Operating Leases APCo I&M OPCo PSO SWEPCo
  (in thousands)
2013 $ 15,693 $ 98,719 $ 58,968 $ 2,383 $ 5,893
2014   13,959   98,673   55,261   1,858   4,279
2015   11,054   97,266   52,287   1,524   3,672
2016   10,270   89,872   46,002   1,231   3,030
2017   9,819   84,142   42,678   1,048   2,681
Later Years   47,613   423,279   68,094   1,723   10,297
Total Future Minimum Lease               
 Payments $ 108,408 $ 891,951 $ 323,290 $ 9,767 $ 29,852
Maximum Potential Loss
   Maximum 
 Company Potential Loss 
   (in thousands) 
 APCo $ 3,463 
 I&M   2,432 
 OPCo   4,003 
 PSO   1,171 
 SWEPCo   2,405 
Future Minimum Lease Payments of Rockport Lease
 Future Minimum Lease Payments I&M
    (in millions)
 2013 $ 74
 2014   74
 2015   74
 2016   74
 2017   74
 Later Years   369
 Total Future Minimum Lease Payments $ 739
Ohio Power Co [Member]
  
Lease Rental Costs
Year Ended December 31, 2012 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Net Lease Expense on Operating Leases $ 15,633 $ 95,509 $ 59,836 $ 5,283 $ 5,797
Amortization of Capital Leases   7,429   8,429   10,906   3,839   14,793
Interest on Capital Leases   1,782   1,738   3,307   815   9,041
Total Lease Rental Costs $ 24,844 $ 105,676 $ 74,049 $ 9,937 $ 29,631
                
Year Ended December 31, 2011 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Net Lease Expense on Operating Leases $ 13,488 $ 94,317 $ 59,983 $ 6,532 $ 5,990
Amortization of Capital Leases   7,880   8,762   13,118   4,438   12,694
Interest on Capital Leases   1,898   2,115   3,753   1,098   9,651
Total Lease Rental Costs $ 23,266 $ 105,194 $ 76,854 $ 12,068 $ 28,335
                
Year Ended December 31, 2010 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Net Lease Expense on Operating Leases $ 18,034 $ 91,973 $ 62,887 $ 2,649 $ 5,877
Amortization of Capital Leases   7,002   31,178   12,069   3,992   11,742
Interest on Capital Leases   1,598   2,298   3,132   1,057   9,892
Total Lease Rental Costs $ 26,634 $ 125,449 $ 78,088 $ 7,698 $ 27,511
Property, Plant and Equipment and Related Obligations Under Capital Leases
December 31, 2012 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Property, Plant and Equipment Under               
 Capital Leases:               
Generation $ 11,798 $ 19,102 $ 39,080 $ 3,624 $ 27,745
Other Property, Plant and Equipment   20,944   22,697   35,666   15,614   154,166
Total Property, Plant and Equipment   32,742   41,799   74,746   19,238   181,911
Accumulated Amortization   10,282   13,154   27,513   6,738   50,440
Net Property, Plant and Equipment               
 Under Capital Leases $ 22,460 $ 28,645 $ 47,233 $ 12,500 $ 131,471
                 
Obligations Under Capital Leases:               
Noncurrent Liability $ 16,375 $ 22,842 $ 36,381 $ 8,864 $ 114,161
Liability Due Within One Year   6,085   5,803   14,707   3,636   17,599
                 
Total Obligations Under Capital Leases $ 22,460 $ 28,645 $ 51,088 $ 12,500 $ 131,760

December 31, 2011 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Property, Plant and Equipment Under               
 Capital Leases:               
Generation $ 11,712 $ 16,100 $ 36,689 $ 3,617 $ 20,453
Other Property, Plant and Equipment   25,201   27,712   36,264   16,441   145,273
Total Property, Plant and Equipment   36,913   43,812   72,953   20,058   165,726
Accumulated Amortization   9,886   12,779   22,075   5,196   38,163
Net Property, Plant and Equipment               
 Under Capital Leases $ 27,027 $ 31,033 $ 50,878 $ 14,862 $ 127,563
                 
Obligations Under Capital Leases:               
Noncurrent Liability $ 19,293 $ 23,117 $ 40,152 $ 11,101 $ 112,802
Liability Due Within One Year   7,734   7,916   14,096   3,761   15,058
                 
Total Obligations Under Capital Leases $ 27,027 $ 31,033 $ 54,248 $ 14,862 $ 127,860
Future Minimum Lease Payments
Capital Leases APCo I&M OPCo PSO SWEPCo
  (in thousands)
2013 $ 6,988 $ 6,827 $ 13,669 $ 4,222 $ 25,706
2014   4,596   5,649   10,371   3,149   23,702
2015   3,849   4,279   7,383   1,921   21,585
2016   3,372   3,504   6,743   1,636   18,728
2017   2,809   3,344   6,322   1,646   20,103
Later Years   3,748   11,781   17,905   1,709   60,112
Total Future Minimum Lease               
 Payments   25,362   35,384   62,393   14,283   169,936
Less Estimated Interest Element   2,902   6,739   11,305   1,782   38,176
Estimated Present Value of Future               
 Minimum Lease Payments $ 22,460 $ 28,645 $ 51,088 $ 12,501 $ 131,760
                 
Noncancelable Operating Leases APCo I&M OPCo PSO SWEPCo
  (in thousands)
2013 $ 15,693 $ 98,719 $ 58,968 $ 2,383 $ 5,893
2014   13,959   98,673   55,261   1,858   4,279
2015   11,054   97,266   52,287   1,524   3,672
2016   10,270   89,872   46,002   1,231   3,030
2017   9,819   84,142   42,678   1,048   2,681
Later Years   47,613   423,279   68,094   1,723   10,297
Total Future Minimum Lease               
 Payments $ 108,408 $ 891,951 $ 323,290 $ 9,767 $ 29,852
Maximum Potential Loss
   Maximum 
 Company Potential Loss 
   (in thousands) 
 APCo $ 3,463 
 I&M   2,432 
 OPCo   4,003 
 PSO   1,171 
 SWEPCo   2,405 
Public Service Co of Oklahoma [Member]
  
Lease Rental Costs
Year Ended December 31, 2012 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Net Lease Expense on Operating Leases $ 15,633 $ 95,509 $ 59,836 $ 5,283 $ 5,797
Amortization of Capital Leases   7,429   8,429   10,906   3,839   14,793
Interest on Capital Leases   1,782   1,738   3,307   815   9,041
Total Lease Rental Costs $ 24,844 $ 105,676 $ 74,049 $ 9,937 $ 29,631
                
Year Ended December 31, 2011 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Net Lease Expense on Operating Leases $ 13,488 $ 94,317 $ 59,983 $ 6,532 $ 5,990
Amortization of Capital Leases   7,880   8,762   13,118   4,438   12,694
Interest on Capital Leases   1,898   2,115   3,753   1,098   9,651
Total Lease Rental Costs $ 23,266 $ 105,194 $ 76,854 $ 12,068 $ 28,335
                
Year Ended December 31, 2010 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Net Lease Expense on Operating Leases $ 18,034 $ 91,973 $ 62,887 $ 2,649 $ 5,877
Amortization of Capital Leases   7,002   31,178   12,069   3,992   11,742
Interest on Capital Leases   1,598   2,298   3,132   1,057   9,892
Total Lease Rental Costs $ 26,634 $ 125,449 $ 78,088 $ 7,698 $ 27,511
Property, Plant and Equipment and Related Obligations Under Capital Leases
December 31, 2012 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Property, Plant and Equipment Under               
 Capital Leases:               
Generation $ 11,798 $ 19,102 $ 39,080 $ 3,624 $ 27,745
Other Property, Plant and Equipment   20,944   22,697   35,666   15,614   154,166
Total Property, Plant and Equipment   32,742   41,799   74,746   19,238   181,911
Accumulated Amortization   10,282   13,154   27,513   6,738   50,440
Net Property, Plant and Equipment               
 Under Capital Leases $ 22,460 $ 28,645 $ 47,233 $ 12,500 $ 131,471
                 
Obligations Under Capital Leases:               
Noncurrent Liability $ 16,375 $ 22,842 $ 36,381 $ 8,864 $ 114,161
Liability Due Within One Year   6,085   5,803   14,707   3,636   17,599
                 
Total Obligations Under Capital Leases $ 22,460 $ 28,645 $ 51,088 $ 12,500 $ 131,760

December 31, 2011 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Property, Plant and Equipment Under               
 Capital Leases:               
Generation $ 11,712 $ 16,100 $ 36,689 $ 3,617 $ 20,453
Other Property, Plant and Equipment   25,201   27,712   36,264   16,441   145,273
Total Property, Plant and Equipment   36,913   43,812   72,953   20,058   165,726
Accumulated Amortization   9,886   12,779   22,075   5,196   38,163
Net Property, Plant and Equipment               
 Under Capital Leases $ 27,027 $ 31,033 $ 50,878 $ 14,862 $ 127,563
                 
Obligations Under Capital Leases:               
Noncurrent Liability $ 19,293 $ 23,117 $ 40,152 $ 11,101 $ 112,802
Liability Due Within One Year   7,734   7,916   14,096   3,761   15,058
                 
Total Obligations Under Capital Leases $ 27,027 $ 31,033 $ 54,248 $ 14,862 $ 127,860
Future Minimum Lease Payments
Capital Leases APCo I&M OPCo PSO SWEPCo
  (in thousands)
2013 $ 6,988 $ 6,827 $ 13,669 $ 4,222 $ 25,706
2014   4,596   5,649   10,371   3,149   23,702
2015   3,849   4,279   7,383   1,921   21,585
2016   3,372   3,504   6,743   1,636   18,728
2017   2,809   3,344   6,322   1,646   20,103
Later Years   3,748   11,781   17,905   1,709   60,112
Total Future Minimum Lease               
 Payments   25,362   35,384   62,393   14,283   169,936
Less Estimated Interest Element   2,902   6,739   11,305   1,782   38,176
Estimated Present Value of Future               
 Minimum Lease Payments $ 22,460 $ 28,645 $ 51,088 $ 12,501 $ 131,760
                 
Noncancelable Operating Leases APCo I&M OPCo PSO SWEPCo
  (in thousands)
2013 $ 15,693 $ 98,719 $ 58,968 $ 2,383 $ 5,893
2014   13,959   98,673   55,261   1,858   4,279
2015   11,054   97,266   52,287   1,524   3,672
2016   10,270   89,872   46,002   1,231   3,030
2017   9,819   84,142   42,678   1,048   2,681
Later Years   47,613   423,279   68,094   1,723   10,297
Total Future Minimum Lease               
 Payments $ 108,408 $ 891,951 $ 323,290 $ 9,767 $ 29,852
Maximum Potential Loss
   Maximum 
 Company Potential Loss 
   (in thousands) 
 APCo $ 3,463 
 I&M   2,432 
 OPCo   4,003 
 PSO   1,171 
 SWEPCo   2,405 
Southwestern Electric Power Co [Member]
  
Lease Rental Costs
Year Ended December 31, 2012 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Net Lease Expense on Operating Leases $ 15,633 $ 95,509 $ 59,836 $ 5,283 $ 5,797
Amortization of Capital Leases   7,429   8,429   10,906   3,839   14,793
Interest on Capital Leases   1,782   1,738   3,307   815   9,041
Total Lease Rental Costs $ 24,844 $ 105,676 $ 74,049 $ 9,937 $ 29,631
                
Year Ended December 31, 2011 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Net Lease Expense on Operating Leases $ 13,488 $ 94,317 $ 59,983 $ 6,532 $ 5,990
Amortization of Capital Leases   7,880   8,762   13,118   4,438   12,694
Interest on Capital Leases   1,898   2,115   3,753   1,098   9,651
Total Lease Rental Costs $ 23,266 $ 105,194 $ 76,854 $ 12,068 $ 28,335
                
Year Ended December 31, 2010 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Net Lease Expense on Operating Leases $ 18,034 $ 91,973 $ 62,887 $ 2,649 $ 5,877
Amortization of Capital Leases   7,002   31,178   12,069   3,992   11,742
Interest on Capital Leases   1,598   2,298   3,132   1,057   9,892
Total Lease Rental Costs $ 26,634 $ 125,449 $ 78,088 $ 7,698 $ 27,511
Property, Plant and Equipment and Related Obligations Under Capital Leases
December 31, 2012 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Property, Plant and Equipment Under               
 Capital Leases:               
Generation $ 11,798 $ 19,102 $ 39,080 $ 3,624 $ 27,745
Other Property, Plant and Equipment   20,944   22,697   35,666   15,614   154,166
Total Property, Plant and Equipment   32,742   41,799   74,746   19,238   181,911
Accumulated Amortization   10,282   13,154   27,513   6,738   50,440
Net Property, Plant and Equipment               
 Under Capital Leases $ 22,460 $ 28,645 $ 47,233 $ 12,500 $ 131,471
                 
Obligations Under Capital Leases:               
Noncurrent Liability $ 16,375 $ 22,842 $ 36,381 $ 8,864 $ 114,161
Liability Due Within One Year   6,085   5,803   14,707   3,636   17,599
                 
Total Obligations Under Capital Leases $ 22,460 $ 28,645 $ 51,088 $ 12,500 $ 131,760

December 31, 2011 APCo I&M OPCo PSO SWEPCo
  (in thousands)
Property, Plant and Equipment Under               
 Capital Leases:               
Generation $ 11,712 $ 16,100 $ 36,689 $ 3,617 $ 20,453
Other Property, Plant and Equipment   25,201   27,712   36,264   16,441   145,273
Total Property, Plant and Equipment   36,913   43,812   72,953   20,058   165,726
Accumulated Amortization   9,886   12,779   22,075   5,196   38,163
Net Property, Plant and Equipment               
 Under Capital Leases $ 27,027 $ 31,033 $ 50,878 $ 14,862 $ 127,563
                 
Obligations Under Capital Leases:               
Noncurrent Liability $ 19,293 $ 23,117 $ 40,152 $ 11,101 $ 112,802
Liability Due Within One Year   7,734   7,916   14,096   3,761   15,058
                 
Total Obligations Under Capital Leases $ 27,027 $ 31,033 $ 54,248 $ 14,862 $ 127,860
Future Minimum Lease Payments
Capital Leases APCo I&M OPCo PSO SWEPCo
  (in thousands)
2013 $ 6,988 $ 6,827 $ 13,669 $ 4,222 $ 25,706
2014   4,596   5,649   10,371   3,149   23,702
2015   3,849   4,279   7,383   1,921   21,585
2016   3,372   3,504   6,743   1,636   18,728
2017   2,809   3,344   6,322   1,646   20,103
Later Years   3,748   11,781   17,905   1,709   60,112
Total Future Minimum Lease               
 Payments   25,362   35,384   62,393   14,283   169,936
Less Estimated Interest Element   2,902   6,739   11,305   1,782   38,176
Estimated Present Value of Future               
 Minimum Lease Payments $ 22,460 $ 28,645 $ 51,088 $ 12,501 $ 131,760
                 
Noncancelable Operating Leases APCo I&M OPCo PSO SWEPCo
  (in thousands)
2013 $ 15,693 $ 98,719 $ 58,968 $ 2,383 $ 5,893
2014   13,959   98,673   55,261   1,858   4,279
2015   11,054   97,266   52,287   1,524   3,672
2016   10,270   89,872   46,002   1,231   3,030
2017   9,819   84,142   42,678   1,048   2,681
Later Years   47,613   423,279   68,094   1,723   10,297
Total Future Minimum Lease               
 Payments $ 108,408 $ 891,951 $ 323,290 $ 9,767 $ 29,852
Maximum Potential Loss
   Maximum 
 Company Potential Loss 
   (in thousands) 
 APCo $ 3,463 
 I&M   2,432 
 OPCo   4,003 
 PSO   1,171 
 SWEPCo   2,405