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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2012
Details of Income Taxes as Reported
     Years Ended December 31,
     2012 2011 2010
     (in millions)
 Federal:         
   Current $ (52) $ 20 $ (134)
   Deferred   698   786   760
 Total Federal   646   806   626
           
 State and Local:         
   Current   35   37   (20)
   Deferred   (77)   (25)   38
 Total State and Local   (42)   12   18
           
 International:         
   Current   -   -   (1)
   Deferred   -   -   -
 Total International   -   -   (1)
           
 Income Tax Expense $ 604 $ 818 $ 643
Reconciliation of Federal Statutory Tax Rate to Reported Tax Rate
 Years Ended December 31,
 2012 2011 2010
 (in millions)
Net Income$ 1,262 $ 1,949 $ 1,218
Extraordinary Item, Net of Tax of $(112) million in 2011  -   (373)   -
Income Before Extraordinary Item  1,262   1,576   1,218
Income Tax Expense  604   818   643
Pretax Income$ 1,866 $ 2,394 $ 1,861
         
Income Taxes on Pretax Income at Statutory Rate (35%)$ 653 $ 838 $ 651
Increase (Decrease) in Income Taxes resulting from the following items:        
  Depreciation  39   41   47
  Investment Tax Credits, Net  (14)   (15)   (16)
  Energy Production Credits  -   (18)   (20)
  State and Local Income Taxes, Net  (33)   (22)   11
  Removal Costs  (18)   (20)   (19)
  AFUDC  (39)   (42)   (33)
  Medicare Subsidy  3   1   12
  Valuation Allowance  6   86   -
  Tax Reserve Adjustments  17   2   (16)
  Other  (10)   (33)   26
Income Tax Expense$ 604 $ 818 $ 643
         
Effective Income Tax Rate  32.4%   34.2%   34.6%
Reconciliation of Significant Temporary Differences
   December 31,
   2012 2011
   (in millions)
 Deferred Tax Assets $ 2,900 $ 2,855
 Deferred Tax Liabilities   (12,098)   (11,185)
 Net Deferred Tax Liabilities $ (9,198) $ (8,330)
        
 Property Related Temporary Differences $ (6,752) $ (5,963)
 Amounts Due from Customers for Future Federal Income Taxes   (289)   (259)
 Deferred State Income Taxes   (683)   (668)
 Securitized Transition Assets   (780)   (621)
 Regulatory Assets   (781)   (1,208)
 Postretirement Benefits   266   424
 Accrued Pensions   104   149
 Deferred Income Taxes on Other Comprehensive Loss   184   254
 Accrued Nuclear Decommissioning   (475)   (436)
 Net Operating Loss Carryforward   194   125
 Tax Credit Carryforward   104   182
 Valuation Allowance   (92)   (86)
 All Other, Net   (198)   (223)
 Net Deferred Tax Liabilities $ (9,198) $ (8,330)
State Net Income Tax Operating Loss Carryforwards
   State Net Income  
   Tax Operating  
   Loss Year of
 State Carryforward Expiration
   (in millions)  
 Louisiana $ 314 2027
 Oklahoma   137 2031
 Tennessee   13 2026
 Virginia   329 2031
 West Virginia   897 2032
Summary of Interest Income, Expense And Reversal
  Years Ended December 31,
  2012 2011 2010
  (in millions)
 Interest Expense$ 11 $8 $ 8
 Interest Income  -  22   11
 Reversal of Prior Period Interest Expense  1  13   5
Amounts Accrued for Interest Related to Uncertain Tax Positions
  December 31,
  2012 2011
  (in millions)
 Accrual for Receipt of Interest$ - $ 13
 Accrual for Payment of Interest and Penalties  7   6
Reconciliation of Beginning and Ending Unrecognized Tax Benefits
   2012 2011 2010
   (in millions)
 Balance as of January 1, $ 168 $ 219 $ 237
 Increase - Tax Positions Taken During a Prior Period   23   51   40
 Decrease - Tax Positions Taken During a Prior Period   (16)   (43)   (43)
 Increase - Tax Positions Taken During the Current Year   121   10   -
 Decrease - Tax Positions Taken During the Current Year   -   -   (6)
 Decrease - Settlements with Taxing Authorities   (25)   (31)   (2)
 Decrease - Lapse of the Applicable Statute of Limitations   (4)   (38)   (7)
 Balance as of December 31, $ 267 $ 168 $ 219
Appalachian Power Co [Member]
  
Details of Income Taxes as Reported
Year Ended December 31, 2012 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ 28,307 $ (9,221) $ 100,447 $ 18,634 $ (214,353)
 Deferred   138,460   53,067   45,685   48,916   260,761
 Deferred Investment Tax Credits   (1,240)   (4,502)   (1,849)   (856)   (550)
Income Tax Expense  $ 165,527 $ 39,344 $ 144,283 $ 66,694 $ 45,858
                 
Year Ended December 31, 2011 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ (15,136) $ (86,471) $ 96,893 $ 6,904 $ 40,727
 Deferred   107,565   141,014   119,184   61,581   16,726
 Deferred Investment Tax Credits   (2,569)   (2,783)   (2,380)   (856)   (550)
Income Tax Expense  $ 89,860 $ 51,760 $ 213,697 $ 67,629 $ 56,903
                 
Year Ended December 31, 2010 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ (66,216) $ 1,795 $ 11,403 $ (46,528) $ (16,066)
 Deferred   144,413   63,947   292,831   92,695   81,764
 Deferred Investment Tax Credits   (3,967)   (2,316)   (2,928)   3,933   (1,484)
Income Tax Expense  $ 74,230 $ 63,426 $ 301,306 $ 50,100 $ 64,214
Reconciliation of Federal Statutory Tax Rate to Reported Tax Rate
APCoYears Ended December 31,
 2012 2011 2010
 (in thousands)
Net Income$ 257,503 $ 162,758 $ 136,668
Income Tax Expense  165,527   89,860   74,230
Pretax Income$ 423,030 $ 252,618 $ 210,898
         
Income Taxes on Pretax Income at Statutory Rate (35%)$ 148,061 $ 88,416 $ 73,814
Increase (Decrease) in Income Taxes Resulting from the Following Items:        
  Depreciation  20,424   17,923   18,134
  Investment Tax Credits, Net  (1,240)   (2,569)   (3,967)
  State and Local Income Taxes, Net  3,175   (35,532)   (7,189)
  Removal Costs  (6,641)   (4,447)   (6,709)
  AFUDC  (1,145)   (5,314)   (1,860)
  Medicare Subsidy  382   4,908   (1,159)
  Valuation Allowance  5,674   30,541   -
  Other  (3,163)   (4,066)   3,166
Income Tax Expense$ 165,527 $ 89,860 $ 74,230
         
Effective Income Tax Rate  39.1%   35.6%   35.2%
Reconciliation of Significant Temporary Differences
 APCo December 31,
   2012 2011
   (in thousands)
 Deferred Tax Assets $ 526,665 $ 591,379
 Deferred Tax Liabilities   (2,467,063)   (2,341,814)
 Net Deferred Tax Liabilities $ (1,940,398) $ (1,750,435)
        
 Property Related Temporary Differences $ (1,416,426) $ (1,303,698)
 Amounts Due from Customers for Future Federal Income Taxes   (100,520)   (95,960)
 Deferred State Income Taxes   (230,490)   (235,296)
 Regulatory Assets   (161,274)   (194,161)
 Postretirement Benefits   45,044   61,109
 Accrued Pensions   41,643   45,782
 Deferred Income Taxes on Other Comprehensive Loss   16,099   31,523
 Deferred Fuel and Purchased Power   (115,900)   (131,137)
 Net Operating Loss Carryforward   69,580   88,721
 Tax Credit Carryforward   13,199   37,850
 Valuation Allowance   (36,215)   (30,541)
 All Other, Net   (65,138)   (24,627)
 Net Deferred Tax Liabilities $ (1,940,398) $ (1,750,435)
State Net Income Tax Operating Loss Carryforwards
      State Net Income   
     Tax Operating  
     Loss Year of
 Company State Carryforward Expiration
      (in thousands)   
 APCo Tennessee $ 12,513  2026
 APCo Virginia   328,850  2031
 APCo West Virginia   583,890  2032
 OPCo West Virginia   312,791  2032
 PSO Oklahoma   99,792  2031
 SWEPCo Louisiana   313,750  2027
Summary of Tax Credit Carryforwards
      Federal Tax   State Tax
      Credit    Credit
   Total Federal Carryforward Total State Carryforward
   Tax Credit Subject to Tax Credit Subject to
 Company Carryforward Expiration Carryforward Expiration
   (in thousands)
 APCo $ 12,692 $ 4,476 $ 65,653 $ 29,297
 I&M   2,487   2,487   -   -
 OPCo   21,321   1,548   -   -
 PSO   401   381   16,194   -
 SWEPCo   2,537   899   -   -
Summary of Interest Income, Expense And Reversal
  Years Ended December 31,
  2012 2011
      Reversal of     Reversal of
      Prior Period     Prior Period
  Interest Interest Interest Interest Interest Interest
Company Expense Income Expense Expense Income Expense
  (in thousands)
APCo $ 62 $ - $ 183 $ 737 $ 3,229 $ 2,416
I&M   1,355   -   -   -   2,681   638
OPCo   266   -   504   1,213   5,173   4,019
PSO   259   -   294   239   344   3,123
SWEPCo   286   -   271   1,382   1,991   2,255

   Year Ended December 31, 2010
       Reversal of
         Prior Period
   Interest Interest Interest
 Company Expense Income Expense
           
   (in thousands)
 APCo $ 2,330 $ - $ 1,146
 I&M   -   209   159
 OPCo   3,948   -   1,653
 PSO   455   -   871
 SWEPCo   749   -   320
Amounts Accrued for Interest Related to Uncertain Tax Positions
   December 31,
 Company 2012 2011
   (in thousands)
 APCo $ - $ 70
 I&M   -   759
 OPCo   -   869
 PSO   15   134
 SWEPCo   -   452

   December 31,
 Company 2012 2011
   (in thousands)
 APCo $ 271 $ 120
 I&M   1,337   145
 OPCo   451   1,513
 PSO   424   426
 SWEPCo   1,061   668
Reconciliation of Beginning and Ending Unrecognized Tax Benefits
 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2012$ 7,311 $ 14,071 $ 43,565 $ 3,585 $ 9,031
Increase - Tax Positions Taken During              
  a Prior Period  -   2,266   1,360   421   2,806
Decrease - Tax Positions Taken During              
  a Prior Period  (384)   (1,252)   (13,582)   (92)   (775)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Settlements with Taxing              
  Authorities  (1,674)   -   (20,291)   -   -
Decrease - Lapse of the Applicable              
  Statute of Limitations  -   -   -   (1,641)   (1,509)
Balance as of December 31, 2012$ 5,253 $ 15,085 $ 11,052 $ 2,273 $ 9,553

 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2011$ 13,267 $ 17,871 $ 68,655 $ 9,845 $ 14,410
Increase - Tax Positions Taken During              
  a Prior Period  5,990   9,256   11,330   1,339   14,355
Decrease - Tax Positions Taken During              
  a Prior Period  (2,100)   (8,622)   (20,299)   (1,171)   (2,706)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Settlements with Taxing              
  Authorities  (2,587)   (1,424)   (6,935)   (1,178)   (12,997)
Decrease - Lapse of the Applicable              
  Statute of Limitations  (7,259)   (3,010)   (9,186)   (5,250)   (4,031)
Balance as of December 31, 2011$ 7,311 $ 14,071 $ 43,565 $ 3,585 $ 9,031

 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2010$ 17,292 $ 20,007 $ 65,551 $ 12,216 $ 10,163
Increase - Tax Positions Taken During              
  a Prior Period  4,177   4,964   19,214   151   6,128
Decrease - Tax Positions Taken During              
  a Prior Period  (6,376)   (5,287)   (8,837)   (1,200)   (376)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Tax Positions Taken During              
  the Current Year  (1,015)   (1,487)   (1,749)   (517)   (691)
Decrease - Settlements with Taxing              
  Authorities  (811)   (236)   (70)   (265)   (4)
Decrease - Lapse of the Applicable              
  Statute of Limitations  -   (90)   (5,454)   (540)   (810)
Balance as of December 31, 2010$ 13,267 $ 17,871 $ 68,655 $ 9,845 $ 14,410
Unrecognized Tax Benefits Affecting Effective Tax Rate
 Company 2012 2011 2010
   (in thousands)
 APCo $ - $ 806 $ 1,109
 I&M   1,220   654   1,664
 OPCo   674   21,177   28,749
 PSO   818   1,882   1,977
 SWEPCo   3,512   3,717   2,481
American Recovery Act Cash Flow Benefit
 Company (in thousands)
 APCo $ 170,466
 I&M   78,456
 OPCo   141,111
 PSO   10,741
 SWEPCo   -
Health Care Acts
   Net Reduction Tax  
   to Deferred Regulatory Decrease in
 Company Tax Assets Assets, Net Net Income
   (in thousands)
 APCo $ 9,397 $8,831 $ 566
 I&M   7,212  6,528   684
 OPCo   12,771  6,990   5,781
 PSO   3,172  3,172   -
 SWEPCo   3,412  3,412   -
Small Business Act
 Company (in thousands)
 APCo $ 43,379
 I&M   49,740
 OPCo   124,637
 PSO   -
 SWEPCo   30,269
Indiana Michigan Power Co [Member]
  
Details of Income Taxes as Reported
Year Ended December 31, 2012 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ 28,307 $ (9,221) $ 100,447 $ 18,634 $ (214,353)
 Deferred   138,460   53,067   45,685   48,916   260,761
 Deferred Investment Tax Credits   (1,240)   (4,502)   (1,849)   (856)   (550)
Income Tax Expense  $ 165,527 $ 39,344 $ 144,283 $ 66,694 $ 45,858
                 
Year Ended December 31, 2011 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ (15,136) $ (86,471) $ 96,893 $ 6,904 $ 40,727
 Deferred   107,565   141,014   119,184   61,581   16,726
 Deferred Investment Tax Credits   (2,569)   (2,783)   (2,380)   (856)   (550)
Income Tax Expense  $ 89,860 $ 51,760 $ 213,697 $ 67,629 $ 56,903
                 
Year Ended December 31, 2010 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ (66,216) $ 1,795 $ 11,403 $ (46,528) $ (16,066)
 Deferred   144,413   63,947   292,831   92,695   81,764
 Deferred Investment Tax Credits   (3,967)   (2,316)   (2,928)   3,933   (1,484)
Income Tax Expense  $ 74,230 $ 63,426 $ 301,306 $ 50,100 $ 64,214
Reconciliation of Federal Statutory Tax Rate to Reported Tax Rate
I&MYears Ended December 31,
 2012 2011 2010
 (in thousands)
Net Income$ 118,457 $ 149,674 $ 126,091
Income Tax Expense  39,344   51,760   63,426
Pretax Income$ 157,801 $ 201,434 $ 189,517
         
Income Taxes on Pretax Income at Statutory Rate (35%)$ 55,230 $ 70,502 $ 66,331
Increase (Decrease) in Income Taxes Resulting from the Following Items:        
  Depreciation  8,659   7,895   11,419
  Investment Tax Credits, Net  (4,502)   (2,783)   (2,316)
  State and Local Income Taxes, Net  (1,559)   (1,376)   3,966
  Removal Costs  (5,490)   (5,566)   (3,663)
  AFUDC  (7,218)   (9,223)   (9,032)
  Nuclear Fuel Disposal Costs  225   (1,400)   (1,655)
  Other  (6,001)   (6,289)   (1,624)
Income Tax Expense$ 39,344 $ 51,760 $ 63,426
         
Effective Income Tax Rate  24.9%   25.7%   33.5%
Reconciliation of Significant Temporary Differences
 I&M December 31,
   2012 2011
   (in thousands)
 Deferred Tax Assets $ 831,724 $ 773,679
 Deferred Tax Liabilities   (1,842,791)   (1,700,182)
 Net Deferred Tax Liabilities $ (1,011,067) $ (926,503)
        
 Property Related Temporary Differences $ (351,682) $ (305,400)
 Amounts Due from Customers for Future Federal Income Taxes   (37,633)   (28,551)
 Deferred State Income Taxes   (112,388)   (107,497)
 Deferred Income Taxes on Other Comprehensive Loss   15,553   15,196
 Accrued Nuclear Decommissioning   (475,223)   (435,916)
 Postretirement Benefits   27,323   51,037
 Net Operating Loss Carryforward   31,233   12,986
 Accrued Pensions   24,746   27,819
 Regulatory Assets   (88,696)   (116,474)
 All Other, Net   (44,300)   (39,703)
 Net Deferred Tax Liabilities $ (1,011,067) $ (926,503)
Summary of Tax Credit Carryforwards
      Federal Tax   State Tax
      Credit    Credit
   Total Federal Carryforward Total State Carryforward
   Tax Credit Subject to Tax Credit Subject to
 Company Carryforward Expiration Carryforward Expiration
   (in thousands)
 APCo $ 12,692 $ 4,476 $ 65,653 $ 29,297
 I&M   2,487   2,487   -   -
 OPCo   21,321   1,548   -   -
 PSO   401   381   16,194   -
 SWEPCo   2,537   899   -   -
Summary of Interest Income, Expense And Reversal
  Years Ended December 31,
  2012 2011
      Reversal of     Reversal of
      Prior Period     Prior Period
  Interest Interest Interest Interest Interest Interest
Company Expense Income Expense Expense Income Expense
  (in thousands)
APCo $ 62 $ - $ 183 $ 737 $ 3,229 $ 2,416
I&M   1,355   -   -   -   2,681   638
OPCo   266   -   504   1,213   5,173   4,019
PSO   259   -   294   239   344   3,123
SWEPCo   286   -   271   1,382   1,991   2,255

   Year Ended December 31, 2010
       Reversal of
         Prior Period
   Interest Interest Interest
 Company Expense Income Expense
           
   (in thousands)
 APCo $ 2,330 $ - $ 1,146
 I&M   -   209   159
 OPCo   3,948   -   1,653
 PSO   455   -   871
 SWEPCo   749   -   320
Amounts Accrued for Interest Related to Uncertain Tax Positions
   December 31,
 Company 2012 2011
   (in thousands)
 APCo $ - $ 70
 I&M   -   759
 OPCo   -   869
 PSO   15   134
 SWEPCo   -   452

   December 31,
 Company 2012 2011
   (in thousands)
 APCo $ 271 $ 120
 I&M   1,337   145
 OPCo   451   1,513
 PSO   424   426
 SWEPCo   1,061   668
Reconciliation of Beginning and Ending Unrecognized Tax Benefits
 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2012$ 7,311 $ 14,071 $ 43,565 $ 3,585 $ 9,031
Increase - Tax Positions Taken During              
  a Prior Period  -   2,266   1,360   421   2,806
Decrease - Tax Positions Taken During              
  a Prior Period  (384)   (1,252)   (13,582)   (92)   (775)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Settlements with Taxing              
  Authorities  (1,674)   -   (20,291)   -   -
Decrease - Lapse of the Applicable              
  Statute of Limitations  -   -   -   (1,641)   (1,509)
Balance as of December 31, 2012$ 5,253 $ 15,085 $ 11,052 $ 2,273 $ 9,553

 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2011$ 13,267 $ 17,871 $ 68,655 $ 9,845 $ 14,410
Increase - Tax Positions Taken During              
  a Prior Period  5,990   9,256   11,330   1,339   14,355
Decrease - Tax Positions Taken During              
  a Prior Period  (2,100)   (8,622)   (20,299)   (1,171)   (2,706)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Settlements with Taxing              
  Authorities  (2,587)   (1,424)   (6,935)   (1,178)   (12,997)
Decrease - Lapse of the Applicable              
  Statute of Limitations  (7,259)   (3,010)   (9,186)   (5,250)   (4,031)
Balance as of December 31, 2011$ 7,311 $ 14,071 $ 43,565 $ 3,585 $ 9,031

 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2010$ 17,292 $ 20,007 $ 65,551 $ 12,216 $ 10,163
Increase - Tax Positions Taken During              
  a Prior Period  4,177   4,964   19,214   151   6,128
Decrease - Tax Positions Taken During              
  a Prior Period  (6,376)   (5,287)   (8,837)   (1,200)   (376)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Tax Positions Taken During              
  the Current Year  (1,015)   (1,487)   (1,749)   (517)   (691)
Decrease - Settlements with Taxing              
  Authorities  (811)   (236)   (70)   (265)   (4)
Decrease - Lapse of the Applicable              
  Statute of Limitations  -   (90)   (5,454)   (540)   (810)
Balance as of December 31, 2010$ 13,267 $ 17,871 $ 68,655 $ 9,845 $ 14,410
Unrecognized Tax Benefits Affecting Effective Tax Rate
 Company 2012 2011 2010
   (in thousands)
 APCo $ - $ 806 $ 1,109
 I&M   1,220   654   1,664
 OPCo   674   21,177   28,749
 PSO   818   1,882   1,977
 SWEPCo   3,512   3,717   2,481
American Recovery Act Cash Flow Benefit
 Company (in thousands)
 APCo $ 170,466
 I&M   78,456
 OPCo   141,111
 PSO   10,741
 SWEPCo   -
Health Care Acts
   Net Reduction Tax  
   to Deferred Regulatory Decrease in
 Company Tax Assets Assets, Net Net Income
   (in thousands)
 APCo $ 9,397 $8,831 $ 566
 I&M   7,212  6,528   684
 OPCo   12,771  6,990   5,781
 PSO   3,172  3,172   -
 SWEPCo   3,412  3,412   -
Small Business Act
 Company (in thousands)
 APCo $ 43,379
 I&M   49,740
 OPCo   124,637
 PSO   -
 SWEPCo   30,269
Ohio Power Co [Member]
  
Details of Income Taxes as Reported
Year Ended December 31, 2012 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ 28,307 $ (9,221) $ 100,447 $ 18,634 $ (214,353)
 Deferred   138,460   53,067   45,685   48,916   260,761
 Deferred Investment Tax Credits   (1,240)   (4,502)   (1,849)   (856)   (550)
Income Tax Expense  $ 165,527 $ 39,344 $ 144,283 $ 66,694 $ 45,858
                 
Year Ended December 31, 2011 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ (15,136) $ (86,471) $ 96,893 $ 6,904 $ 40,727
 Deferred   107,565   141,014   119,184   61,581   16,726
 Deferred Investment Tax Credits   (2,569)   (2,783)   (2,380)   (856)   (550)
Income Tax Expense  $ 89,860 $ 51,760 $ 213,697 $ 67,629 $ 56,903
                 
Year Ended December 31, 2010 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ (66,216) $ 1,795 $ 11,403 $ (46,528) $ (16,066)
 Deferred   144,413   63,947   292,831   92,695   81,764
 Deferred Investment Tax Credits   (3,967)   (2,316)   (2,928)   3,933   (1,484)
Income Tax Expense  $ 74,230 $ 63,426 $ 301,306 $ 50,100 $ 64,214
Reconciliation of Federal Statutory Tax Rate to Reported Tax Rate
OPCoYears Ended December 31,
 2012 2011 2010
 (in thousands)
Net Income$ 343,534 $ 464,993 $ 541,616
Income Tax Expense  144,283   213,697   301,306
Pretax Income$ 487,817 $ 678,690 $ 842,922
         
Income Taxes on Pretax Income at Statutory Rate (35%)$ 170,736 $ 237,542 $ 295,023
Increase (Decrease) in Income Taxes Resulting from the Following Items:        
  Depreciation  5,239   6,368   11,443
  Investment Tax Credits, Net  (1,849)   (2,380)   (2,928)
  State and Local Income Taxes, Net  (18,291)   (3,222)   906
  Parent Company Loss Benefit  (11,915)   (7,117)   (9,583)
  Other  363   (17,494)   6,445
Income Tax Expense$ 144,283 $ 213,697 $ 301,306
         
Effective Income Tax Rate  29.6%   31.5%   35.7%
Reconciliation of Significant Temporary Differences
 OPCo December 31,
   2012 2011
   (in thousands)
 Deferred Tax Assets $ 505,003 $ 574,007
 Deferred Tax Liabilities   (2,851,068)   (2,834,046)
 Net Deferred Tax Liabilities $ (2,346,065) $ (2,260,039)
        
 Property Related Temporary Differences $ (2,061,841) $ (1,966,581)
 Amounts Due from Customers for Future Federal Income Taxes   (59,291)   (59,699)
 Deferred State Income Taxes   (90,001)   (98,093)
 Regulatory Assets   (190,273)   (205,925)
 Postretirement Benefits   50,421   74,447
 Accrued Pensions   (43,928)   (30,853)
 Deferred Income Taxes on Other Comprehensive Loss   89,236   106,466
 Impairment Loss   100,459   -
 Deferred Fuel and Purchased Power   (199,997)   (194,509)
 All Other, Net   59,150   114,708
 Net Deferred Tax Liabilities $ (2,346,065) $ (2,260,039)
State Net Income Tax Operating Loss Carryforwards
      State Net Income   
     Tax Operating  
     Loss Year of
 Company State Carryforward Expiration
      (in thousands)   
 APCo Tennessee $ 12,513  2026
 APCo Virginia   328,850  2031
 APCo West Virginia   583,890  2032
 OPCo West Virginia   312,791  2032
 PSO Oklahoma   99,792  2031
 SWEPCo Louisiana   313,750  2027
Summary of Tax Credit Carryforwards
      Federal Tax   State Tax
      Credit    Credit
   Total Federal Carryforward Total State Carryforward
   Tax Credit Subject to Tax Credit Subject to
 Company Carryforward Expiration Carryforward Expiration
   (in thousands)
 APCo $ 12,692 $ 4,476 $ 65,653 $ 29,297
 I&M   2,487   2,487   -   -
 OPCo   21,321   1,548   -   -
 PSO   401   381   16,194   -
 SWEPCo   2,537   899   -   -
Summary of Interest Income, Expense And Reversal
  Years Ended December 31,
  2012 2011
      Reversal of     Reversal of
      Prior Period     Prior Period
  Interest Interest Interest Interest Interest Interest
Company Expense Income Expense Expense Income Expense
  (in thousands)
APCo $ 62 $ - $ 183 $ 737 $ 3,229 $ 2,416
I&M   1,355   -   -   -   2,681   638
OPCo   266   -   504   1,213   5,173   4,019
PSO   259   -   294   239   344   3,123
SWEPCo   286   -   271   1,382   1,991   2,255

   Year Ended December 31, 2010
       Reversal of
         Prior Period
   Interest Interest Interest
 Company Expense Income Expense
           
   (in thousands)
 APCo $ 2,330 $ - $ 1,146
 I&M   -   209   159
 OPCo   3,948   -   1,653
 PSO   455   -   871
 SWEPCo   749   -   320
Amounts Accrued for Interest Related to Uncertain Tax Positions
   December 31,
 Company 2012 2011
   (in thousands)
 APCo $ - $ 70
 I&M   -   759
 OPCo   -   869
 PSO   15   134
 SWEPCo   -   452

   December 31,
 Company 2012 2011
   (in thousands)
 APCo $ 271 $ 120
 I&M   1,337   145
 OPCo   451   1,513
 PSO   424   426
 SWEPCo   1,061   668
Reconciliation of Beginning and Ending Unrecognized Tax Benefits
 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2012$ 7,311 $ 14,071 $ 43,565 $ 3,585 $ 9,031
Increase - Tax Positions Taken During              
  a Prior Period  -   2,266   1,360   421   2,806
Decrease - Tax Positions Taken During              
  a Prior Period  (384)   (1,252)   (13,582)   (92)   (775)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Settlements with Taxing              
  Authorities  (1,674)   -   (20,291)   -   -
Decrease - Lapse of the Applicable              
  Statute of Limitations  -   -   -   (1,641)   (1,509)
Balance as of December 31, 2012$ 5,253 $ 15,085 $ 11,052 $ 2,273 $ 9,553

 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2011$ 13,267 $ 17,871 $ 68,655 $ 9,845 $ 14,410
Increase - Tax Positions Taken During              
  a Prior Period  5,990   9,256   11,330   1,339   14,355
Decrease - Tax Positions Taken During              
  a Prior Period  (2,100)   (8,622)   (20,299)   (1,171)   (2,706)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Settlements with Taxing              
  Authorities  (2,587)   (1,424)   (6,935)   (1,178)   (12,997)
Decrease - Lapse of the Applicable              
  Statute of Limitations  (7,259)   (3,010)   (9,186)   (5,250)   (4,031)
Balance as of December 31, 2011$ 7,311 $ 14,071 $ 43,565 $ 3,585 $ 9,031

 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2010$ 17,292 $ 20,007 $ 65,551 $ 12,216 $ 10,163
Increase - Tax Positions Taken During              
  a Prior Period  4,177   4,964   19,214   151   6,128
Decrease - Tax Positions Taken During              
  a Prior Period  (6,376)   (5,287)   (8,837)   (1,200)   (376)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Tax Positions Taken During              
  the Current Year  (1,015)   (1,487)   (1,749)   (517)   (691)
Decrease - Settlements with Taxing              
  Authorities  (811)   (236)   (70)   (265)   (4)
Decrease - Lapse of the Applicable              
  Statute of Limitations  -   (90)   (5,454)   (540)   (810)
Balance as of December 31, 2010$ 13,267 $ 17,871 $ 68,655 $ 9,845 $ 14,410
Unrecognized Tax Benefits Affecting Effective Tax Rate
 Company 2012 2011 2010
   (in thousands)
 APCo $ - $ 806 $ 1,109
 I&M   1,220   654   1,664
 OPCo   674   21,177   28,749
 PSO   818   1,882   1,977
 SWEPCo   3,512   3,717   2,481
American Recovery Act Cash Flow Benefit
 Company (in thousands)
 APCo $ 170,466
 I&M   78,456
 OPCo   141,111
 PSO   10,741
 SWEPCo   -
Health Care Acts
   Net Reduction Tax  
   to Deferred Regulatory Decrease in
 Company Tax Assets Assets, Net Net Income
   (in thousands)
 APCo $ 9,397 $8,831 $ 566
 I&M   7,212  6,528   684
 OPCo   12,771  6,990   5,781
 PSO   3,172  3,172   -
 SWEPCo   3,412  3,412   -
Small Business Act
 Company (in thousands)
 APCo $ 43,379
 I&M   49,740
 OPCo   124,637
 PSO   -
 SWEPCo   30,269
Public Service Co of Oklahoma [Member]
  
Details of Income Taxes as Reported
Year Ended December 31, 2012 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ 28,307 $ (9,221) $ 100,447 $ 18,634 $ (214,353)
 Deferred   138,460   53,067   45,685   48,916   260,761
 Deferred Investment Tax Credits   (1,240)   (4,502)   (1,849)   (856)   (550)
Income Tax Expense  $ 165,527 $ 39,344 $ 144,283 $ 66,694 $ 45,858
                 
Year Ended December 31, 2011 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ (15,136) $ (86,471) $ 96,893 $ 6,904 $ 40,727
 Deferred   107,565   141,014   119,184   61,581   16,726
 Deferred Investment Tax Credits   (2,569)   (2,783)   (2,380)   (856)   (550)
Income Tax Expense  $ 89,860 $ 51,760 $ 213,697 $ 67,629 $ 56,903
                 
Year Ended December 31, 2010 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ (66,216) $ 1,795 $ 11,403 $ (46,528) $ (16,066)
 Deferred   144,413   63,947   292,831   92,695   81,764
 Deferred Investment Tax Credits   (3,967)   (2,316)   (2,928)   3,933   (1,484)
Income Tax Expense  $ 74,230 $ 63,426 $ 301,306 $ 50,100 $ 64,214
Reconciliation of Federal Statutory Tax Rate to Reported Tax Rate
PSOYears Ended December 31,
 2012 2011 2010
 (in thousands)
Net Income$ 114,141 $ 124,628 $ 72,787
Income Tax Expense  66,694   67,629   50,100
Pretax Income$ 180,835 $ 192,257 $ 122,887
         
Income Taxes on Pretax Income at Statutory Rate (35%)$ 63,292 $ 67,290 $ 43,010
Increase (Decrease) in Income Taxes Resulting from the Following Items:        
  Depreciation  (10)   (165)   (166)
  Investment Tax Credits, Net  (781)   (781)   (781)
  State and Local Income Taxes, Net  6,953   4,744   10,307
  Other  (2,760)   (3,459)   (2,270)
Income Tax Expense$ 66,694 $ 67,629 $ 50,100
         
Effective Income Tax Rate  36.9%   35.2%   40.8%
Reconciliation of Significant Temporary Differences
 PSO December 31,
   2012 2011
   (in thousands)
 Deferred Tax Assets $ 101,561 $ 121,181
 Deferred Tax Liabilities   (835,054)   (840,631)
 Net Deferred Tax Liabilities $ (733,493) $ (719,450)
        
 Property Related Temporary Differences $ (640,859) $ (626,456)
 Amounts Due from Customers for Future Federal Income Taxes   (1,325)   (1,023)
 Deferred State Income Taxes   (95,378)   (89,605)
 Regulatory Assets   (57,367)   (77,016)
 Postretirement Benefits   13,541   25,607
 Accrued Pensions   7,570   12,978
 Deferred Income Taxes on Other Comprehensive Loss   (3,489)   (3,849)
 Deferred Federal Income Taxes on Deferred State Income Taxes   39,050   36,018
 Net Operating Loss Carryforward   3,892   5,247
 Tax Credit Carryforward   401   6,872
 All Other, Net   471   (8,223)
 Net Deferred Tax Liabilities $ (733,493) $ (719,450)
State Net Income Tax Operating Loss Carryforwards
      State Net Income   
     Tax Operating  
     Loss Year of
 Company State Carryforward Expiration
      (in thousands)   
 APCo Tennessee $ 12,513  2026
 APCo Virginia   328,850  2031
 APCo West Virginia   583,890  2032
 OPCo West Virginia   312,791  2032
 PSO Oklahoma   99,792  2031
 SWEPCo Louisiana   313,750  2027
Summary of Tax Credit Carryforwards
      Federal Tax   State Tax
      Credit    Credit
   Total Federal Carryforward Total State Carryforward
   Tax Credit Subject to Tax Credit Subject to
 Company Carryforward Expiration Carryforward Expiration
   (in thousands)
 APCo $ 12,692 $ 4,476 $ 65,653 $ 29,297
 I&M   2,487   2,487   -   -
 OPCo   21,321   1,548   -   -
 PSO   401   381   16,194   -
 SWEPCo   2,537   899   -   -
Summary of Interest Income, Expense And Reversal
  Years Ended December 31,
  2012 2011
      Reversal of     Reversal of
      Prior Period     Prior Period
  Interest Interest Interest Interest Interest Interest
Company Expense Income Expense Expense Income Expense
  (in thousands)
APCo $ 62 $ - $ 183 $ 737 $ 3,229 $ 2,416
I&M   1,355   -   -   -   2,681   638
OPCo   266   -   504   1,213   5,173   4,019
PSO   259   -   294   239   344   3,123
SWEPCo   286   -   271   1,382   1,991   2,255

   Year Ended December 31, 2010
       Reversal of
         Prior Period
   Interest Interest Interest
 Company Expense Income Expense
           
   (in thousands)
 APCo $ 2,330 $ - $ 1,146
 I&M   -   209   159
 OPCo   3,948   -   1,653
 PSO   455   -   871
 SWEPCo   749   -   320
Amounts Accrued for Interest Related to Uncertain Tax Positions
   December 31,
 Company 2012 2011
   (in thousands)
 APCo $ - $ 70
 I&M   -   759
 OPCo   -   869
 PSO   15   134
 SWEPCo   -   452

   December 31,
 Company 2012 2011
   (in thousands)
 APCo $ 271 $ 120
 I&M   1,337   145
 OPCo   451   1,513
 PSO   424   426
 SWEPCo   1,061   668
Reconciliation of Beginning and Ending Unrecognized Tax Benefits
 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2012$ 7,311 $ 14,071 $ 43,565 $ 3,585 $ 9,031
Increase - Tax Positions Taken During              
  a Prior Period  -   2,266   1,360   421   2,806
Decrease - Tax Positions Taken During              
  a Prior Period  (384)   (1,252)   (13,582)   (92)   (775)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Settlements with Taxing              
  Authorities  (1,674)   -   (20,291)   -   -
Decrease - Lapse of the Applicable              
  Statute of Limitations  -   -   -   (1,641)   (1,509)
Balance as of December 31, 2012$ 5,253 $ 15,085 $ 11,052 $ 2,273 $ 9,553

 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2011$ 13,267 $ 17,871 $ 68,655 $ 9,845 $ 14,410
Increase - Tax Positions Taken During              
  a Prior Period  5,990   9,256   11,330   1,339   14,355
Decrease - Tax Positions Taken During              
  a Prior Period  (2,100)   (8,622)   (20,299)   (1,171)   (2,706)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Settlements with Taxing              
  Authorities  (2,587)   (1,424)   (6,935)   (1,178)   (12,997)
Decrease - Lapse of the Applicable              
  Statute of Limitations  (7,259)   (3,010)   (9,186)   (5,250)   (4,031)
Balance as of December 31, 2011$ 7,311 $ 14,071 $ 43,565 $ 3,585 $ 9,031

 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2010$ 17,292 $ 20,007 $ 65,551 $ 12,216 $ 10,163
Increase - Tax Positions Taken During              
  a Prior Period  4,177   4,964   19,214   151   6,128
Decrease - Tax Positions Taken During              
  a Prior Period  (6,376)   (5,287)   (8,837)   (1,200)   (376)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Tax Positions Taken During              
  the Current Year  (1,015)   (1,487)   (1,749)   (517)   (691)
Decrease - Settlements with Taxing              
  Authorities  (811)   (236)   (70)   (265)   (4)
Decrease - Lapse of the Applicable              
  Statute of Limitations  -   (90)   (5,454)   (540)   (810)
Balance as of December 31, 2010$ 13,267 $ 17,871 $ 68,655 $ 9,845 $ 14,410
Unrecognized Tax Benefits Affecting Effective Tax Rate
 Company 2012 2011 2010
   (in thousands)
 APCo $ - $ 806 $ 1,109
 I&M   1,220   654   1,664
 OPCo   674   21,177   28,749
 PSO   818   1,882   1,977
 SWEPCo   3,512   3,717   2,481
American Recovery Act Cash Flow Benefit
 Company (in thousands)
 APCo $ 170,466
 I&M   78,456
 OPCo   141,111
 PSO   10,741
 SWEPCo   -
Health Care Acts
   Net Reduction Tax  
   to Deferred Regulatory Decrease in
 Company Tax Assets Assets, Net Net Income
   (in thousands)
 APCo $ 9,397 $8,831 $ 566
 I&M   7,212  6,528   684
 OPCo   12,771  6,990   5,781
 PSO   3,172  3,172   -
 SWEPCo   3,412  3,412   -
Small Business Act
 Company (in thousands)
 APCo $ 43,379
 I&M   49,740
 OPCo   124,637
 PSO   -
 SWEPCo   30,269
Southwestern Electric Power Co [Member]
  
Details of Income Taxes as Reported
Year Ended December 31, 2012 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ 28,307 $ (9,221) $ 100,447 $ 18,634 $ (214,353)
 Deferred   138,460   53,067   45,685   48,916   260,761
 Deferred Investment Tax Credits   (1,240)   (4,502)   (1,849)   (856)   (550)
Income Tax Expense  $ 165,527 $ 39,344 $ 144,283 $ 66,694 $ 45,858
                 
Year Ended December 31, 2011 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ (15,136) $ (86,471) $ 96,893 $ 6,904 $ 40,727
 Deferred   107,565   141,014   119,184   61,581   16,726
 Deferred Investment Tax Credits   (2,569)   (2,783)   (2,380)   (856)   (550)
Income Tax Expense  $ 89,860 $ 51,760 $ 213,697 $ 67,629 $ 56,903
                 
Year Ended December 31, 2010 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ (66,216) $ 1,795 $ 11,403 $ (46,528) $ (16,066)
 Deferred   144,413   63,947   292,831   92,695   81,764
 Deferred Investment Tax Credits   (3,967)   (2,316)   (2,928)   3,933   (1,484)
Income Tax Expense  $ 74,230 $ 63,426 $ 301,306 $ 50,100 $ 64,214
Reconciliation of Federal Statutory Tax Rate to Reported Tax Rate
SWEPCoYears Ended December 31,
 2012 2011 2010
 (in thousands)
Net Income$ 202,513 $ 165,126 $ 146,684
Income Tax Expense  45,858   56,903   64,214
Pretax Income$ 248,371 $ 222,029 $ 210,898
         
Income Taxes on Pretax Income at Statutory Rate (35%)$ 86,930 $ 77,710 $ 73,814
Increase (Decrease) in Income Taxes Resulting from the Following Items:        
  Depreciation  2,105   (7)   1,223
  Depletion  (3,276)   (1,506)   (1,506)
  Investment Tax Credits, Net  (550)   (550)   (1,484)
  State and Local Income Taxes, Net  (18,010)   4,004   (637)
  AFUDC  (19,879)   (16,962)   (15,856)
  Other  (1,462)   (5,786)   8,660
Income Tax Expense$ 45,858 $ 56,903 $ 64,214
         
Effective Income Tax Rate  18.5%   25.6%   30.4%
Reconciliation of Significant Temporary Differences
 SWEPCo December 31,
   2012 2011
   (in thousands)
 Deferred Tax Assets $ 286,133 $ 143,200
 Deferred Tax Liabilities   (1,260,281)   (800,673)
 Net Deferred Tax Liabilities $ (974,148) $ (657,473)
        
 Property Related Temporary Differences $ (997,337) $ (588,612)
 Amounts Due from Customers for Future Federal Income Taxes   (43,090)   (36,289)
 Deferred State Income Taxes   (98,630)   (70,211)
 Regulatory Assets   (12,922)   (35,349)
 Postretirement Benefits   13,039   21,654
 Accrued Pensions   5,061   5,861
 Deferred Income Taxes on Other Comprehensive Loss   9,618   14,440
 Impairment Loss - Turk Plant   21,700   17,150
 Net Operating Loss Carryforward   104,738   -
 All Other, Net   23,675   13,883
 Net Deferred Tax Liabilities $ (974,148) $ (657,473)
State Net Income Tax Operating Loss Carryforwards
      State Net Income   
     Tax Operating  
     Loss Year of
 Company State Carryforward Expiration
      (in thousands)   
 APCo Tennessee $ 12,513  2026
 APCo Virginia   328,850  2031
 APCo West Virginia   583,890  2032
 OPCo West Virginia   312,791  2032
 PSO Oklahoma   99,792  2031
 SWEPCo Louisiana   313,750  2027
Summary of Tax Credit Carryforwards
      Federal Tax   State Tax
      Credit    Credit
   Total Federal Carryforward Total State Carryforward
   Tax Credit Subject to Tax Credit Subject to
 Company Carryforward Expiration Carryforward Expiration
   (in thousands)
 APCo $ 12,692 $ 4,476 $ 65,653 $ 29,297
 I&M   2,487   2,487   -   -
 OPCo   21,321   1,548   -   -
 PSO   401   381   16,194   -
 SWEPCo   2,537   899   -   -
Summary of Interest Income, Expense And Reversal
  Years Ended December 31,
  2012 2011
      Reversal of     Reversal of
      Prior Period     Prior Period
  Interest Interest Interest Interest Interest Interest
Company Expense Income Expense Expense Income Expense
  (in thousands)
APCo $ 62 $ - $ 183 $ 737 $ 3,229 $ 2,416
I&M   1,355   -   -   -   2,681   638
OPCo   266   -   504   1,213   5,173   4,019
PSO   259   -   294   239   344   3,123
SWEPCo   286   -   271   1,382   1,991   2,255

   Year Ended December 31, 2010
       Reversal of
         Prior Period
   Interest Interest Interest
 Company Expense Income Expense
           
   (in thousands)
 APCo $ 2,330 $ - $ 1,146
 I&M   -   209   159
 OPCo   3,948   -   1,653
 PSO   455   -   871
 SWEPCo   749   -   320
Amounts Accrued for Interest Related to Uncertain Tax Positions
   December 31,
 Company 2012 2011
   (in thousands)
 APCo $ - $ 70
 I&M   -   759
 OPCo   -   869
 PSO   15   134
 SWEPCo   -   452

   December 31,
 Company 2012 2011
   (in thousands)
 APCo $ 271 $ 120
 I&M   1,337   145
 OPCo   451   1,513
 PSO   424   426
 SWEPCo   1,061   668
Reconciliation of Beginning and Ending Unrecognized Tax Benefits
 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2012$ 7,311 $ 14,071 $ 43,565 $ 3,585 $ 9,031
Increase - Tax Positions Taken During              
  a Prior Period  -   2,266   1,360   421   2,806
Decrease - Tax Positions Taken During              
  a Prior Period  (384)   (1,252)   (13,582)   (92)   (775)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Settlements with Taxing              
  Authorities  (1,674)   -   (20,291)   -   -
Decrease - Lapse of the Applicable              
  Statute of Limitations  -   -   -   (1,641)   (1,509)
Balance as of December 31, 2012$ 5,253 $ 15,085 $ 11,052 $ 2,273 $ 9,553

 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2011$ 13,267 $ 17,871 $ 68,655 $ 9,845 $ 14,410
Increase - Tax Positions Taken During              
  a Prior Period  5,990   9,256   11,330   1,339   14,355
Decrease - Tax Positions Taken During              
  a Prior Period  (2,100)   (8,622)   (20,299)   (1,171)   (2,706)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Settlements with Taxing              
  Authorities  (2,587)   (1,424)   (6,935)   (1,178)   (12,997)
Decrease - Lapse of the Applicable              
  Statute of Limitations  (7,259)   (3,010)   (9,186)   (5,250)   (4,031)
Balance as of December 31, 2011$ 7,311 $ 14,071 $ 43,565 $ 3,585 $ 9,031

 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2010$ 17,292 $ 20,007 $ 65,551 $ 12,216 $ 10,163
Increase - Tax Positions Taken During              
  a Prior Period  4,177   4,964   19,214   151   6,128
Decrease - Tax Positions Taken During              
  a Prior Period  (6,376)   (5,287)   (8,837)   (1,200)   (376)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Tax Positions Taken During              
  the Current Year  (1,015)   (1,487)   (1,749)   (517)   (691)
Decrease - Settlements with Taxing              
  Authorities  (811)   (236)   (70)   (265)   (4)
Decrease - Lapse of the Applicable              
  Statute of Limitations  -   (90)   (5,454)   (540)   (810)
Balance as of December 31, 2010$ 13,267 $ 17,871 $ 68,655 $ 9,845 $ 14,410
Unrecognized Tax Benefits Affecting Effective Tax Rate
 Company 2012 2011 2010
   (in thousands)
 APCo $ - $ 806 $ 1,109
 I&M   1,220   654   1,664
 OPCo   674   21,177   28,749
 PSO   818   1,882   1,977
 SWEPCo   3,512   3,717   2,481
American Recovery Act Cash Flow Benefit
 Company (in thousands)
 APCo $ 170,466
 I&M   78,456
 OPCo   141,111
 PSO   10,741
 SWEPCo   -
Health Care Acts
   Net Reduction Tax  
   to Deferred Regulatory Decrease in
 Company Tax Assets Assets, Net Net Income
   (in thousands)
 APCo $ 9,397 $8,831 $ 566
 I&M   7,212  6,528   684
 OPCo   12,771  6,990   5,781
 PSO   3,172  3,172   -
 SWEPCo   3,412  3,412   -
Small Business Act
 Company (in thousands)
 APCo $ 43,379
 I&M   49,740
 OPCo   124,637
 PSO   -
 SWEPCo   30,269