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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2013
Details of Income Taxes as Reported
     Years Ended December 31,
     2013 2012 2011
     (in millions)
 Federal:         
   Current $ (45) $ (52) $ 20
   Deferred   676   698   786
 Total Federal   631   646   806
           
 State and Local:         
   Current   29   35   37
   Deferred   24   (77)   (25)
 Total State and Local   53   (42)   12
           
 Income Tax Expense $ 684 $ 604 $ 818
Reconciliation of Federal Statutory Tax Rate to Reported Tax Rate
 Years Ended December 31,
 2013 2012 2011
 (in millions)
Net Income$ 1,484 $ 1,262 $ 1,949
Extraordinary Item, Net of Tax of $112 million in 2011  -   -   (373)
Income Before Extraordinary Item  1,484   1,262   1,576
Income Tax Expense  684   604   818
Pretax Income$ 2,168 $ 1,866 $ 2,394
         
Income Taxes on Pretax Income at Statutory Rate (35%)$ 759 $ 653 $ 838
Increase (Decrease) in Income Taxes resulting from the following items:        
  Depreciation  47   39   41
  Investment Tax Credits, Net  (14)   (14)   (15)
  Energy Production Credits  -   -   (18)
  State and Local Income Taxes, Net  29   (33)   (22)
  Removal Costs  (21)   (18)   (20)
  AFUDC  (31)   (39)   (42)
  Valuation Allowance  5   6   86
  U.K. Windfall Tax  (80)   15   -
  Other  (10)   (5)   (30)
Income Tax Expense$ 684 $ 604 $ 818
         
Effective Income Tax Rate  31.5%   32.4%   34.2%
Reconciliation of Significant Temporary Differences
   December 31,
   2013 2012
   (in millions)
 Deferred Tax Assets $ 2,900 $ 2,900
 Deferred Tax Liabilities   (13,088)   (12,098)
 Net Deferred Tax Liabilities $ (10,188) $ (9,198)
        
 Property Related Temporary Differences $ (7,508) $ (6,752)
 Amounts Due from Customers for Future Federal Income Taxes   (273)   (289)
 Deferred State Income Taxes   (765)   (683)
 Securitized Assets   (870)   (780)
 Regulatory Assets   (609)   (781)
 Deferred Income Taxes on Other Comprehensive Loss   66   184
 Accrued Nuclear Decommissioning   (554)   (475)
 Net Operating Loss Carryforward   233   194
 Tax Credit Carryforward   109   104
 Valuation Allowance   (97)   (92)
 All Other, Net   80   172
 Net Deferred Tax Liabilities $ (10,188) $ (9,198)
State Net Income Tax Operating Loss Carryforwards
   State Net Income  
   Tax Operating  
   Loss Year of
 State Carryforward Expiration
   (in millions)  
 Indiana $ 50 2033
 Louisiana   428 2028
 Oklahoma   241 2033
 Tennessee   9 2026
 Virginia   301 2031
 West Virginia   725 2032
Summary of Interest Income, Expense And Reversal
  Years Ended December 31,
  2013 2012 2011
  (in millions)
 Interest Expense$ 1 $ 11 $8
 Interest Income  51   -  22
 Reversal of Prior Period Interest Expense  -   1  13
Amounts Accrued for Interest Related to Uncertain Tax Positions
  December 31,
  2013 2012
  (in millions)
 Accrual for Receipt of Interest$ 43 $ -
 Accrual for Payment of Interest and Penalties  5   7
Reconciliation of Beginning and Ending Unrecognized Tax Benefits
   2013 2012 2011
   (in millions)
 Balance as of January 1, $ 267 $ 168 $ 219
 Increase - Tax Positions Taken During a Prior Period   -   23   51
 Decrease - Tax Positions Taken During a Prior Period   (94)   (16)   (43)
 Increase - Tax Positions Taken During the Current Year   2   121   10
 Decrease - Tax Positions Taken During the Current Year   -   -   -
 Decrease - Settlements with Taxing Authorities   -   (25)   (31)
 Decrease - Lapse of the Applicable Statute of Limitations   -   (4)   (38)
 Balance as of December 31, $ 175 $ 267 $ 168
Appalachian Power Co [Member]
 
Details of Income Taxes as Reported
Year Ended December 31, 2013 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ 58,441 $ (49,067) $ 92,625 $ 7,689 $ (10,866)
 Deferred   75,714   129,109   134,463   53,788   81,888
 Deferred Investment Tax Credits   (1,220)   (4,931)   (1,418)   4,408   (1,561)
Income Tax Expense  $ 132,935 $ 75,111 $ 225,670 $ 65,885 $ 69,461
                 
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
Reconciliation of Federal Statutory Tax Rate to Reported Tax Rate
APCoYears Ended December 31,
 2013 2012 2011
 (in thousands)
Net Income$ 193,211 $ 257,503 $ 162,758
Income Tax Expense  132,935   165,527   89,860
Pretax Income$ 326,146 $ 423,030 $ 252,618
         
Income Taxes on Pretax Income at Statutory Rate (35%)$ 114,151 $ 148,061 $ 88,416
Increase (Decrease) in Income Taxes Resulting from the Following Items:        
  Depreciation  20,286   20,424   17,923
  Investment Tax Credits, Net  (1,220)   (1,240)   (2,569)
  State and Local Income Taxes, Net  2,707   3,175   (35,532)
  Removal Costs  (6,454)   (6,641)   (4,447)
  AFUDC  (1,420)   (1,145)   (5,314)
  Medicare Subsidy  -   382   4,908
  Valuation Allowance  5,062   5,674   30,541
  Other  (177)   (3,163)   (4,066)
Income Tax Expense$ 132,935 $ 165,527 $ 89,860
         
Effective Income Tax Rate  40.8%   39.1%   35.6%
Reconciliation of Significant Temporary Differences
 APCo December 31,
   2013 2012
   (in thousands)
 Deferred Tax Assets $ 548,966 $ 526,665
 Deferred Tax Liabilities   (2,788,306)   (2,467,063)
 Net Deferred Tax Liabilities $ (2,239,340) $ (1,940,398)
        
 Property Related Temporary Differences $ (1,725,853) $ (1,416,426)
 Amounts Due from Customers for Future Federal Income Taxes   (94,775)   (100,520)
 Deferred State Income Taxes   (246,247)   (230,490)
 Regulatory Assets   (104,824)   (161,274)
 Securitized Assets   (130,834)   -
 Deferred Income Taxes on Other Comprehensive Loss   (1,589)   16,099
 Deferred Fuel and Purchased Power   24,646   (115,900)
 Net Operating Loss Carryforward   45,177   69,580
 Tax Credit Carryforward   21,940   13,199
 Valuation Allowance   (41,277)   (36,215)
 All Other, Net   14,296   21,549
 Net Deferred Tax Liabilities $ (2,239,340) $ (1,940,398)
State Net Income Tax Operating Loss Carryforwards
      State Net Income   
     Tax Operating  
     Loss Year of
 Company State Carryforward Expiration
      (in thousands)   
 APCo Tennessee $ 8,810  2026
 APCo Virginia   300,637  2031
 APCo West Virginia   489,860  2032
 I&M Indiana   50,425  2033
 OPCo West Virginia   235,636  2032
 PSO Oklahoma   110,615  2033
 SWEPCo Louisiana   422,946  2028
 SWEPCo Oklahoma   2,835  2033
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 $ 21,432 $ 8,504 $ 76,481 $ 28,255
 I&M   2,587   2,587   -   -
 OPCo   20,000   1,714   -   -
 PSO   565   543   21,114   21,114
 SWEPCo   884   759   -   -
Summary of Interest Income, Expense And Reversal
  Years Ended December 31,
  2013 2012
      Reversal of     Reversal of
      Prior Period     Prior Period
  Interest Interest Interest Interest Interest Interest
Company Expense Income Expense Expense Income Expense
  (in thousands)
APCo $ - $ 1,089 $ - $ 62 $ - $ 183
I&M   -   597   -   1,355   -   -
OPCo   -   1,892   -   266   -   504
PSO   -   135   -   259   -   294
SWEPCo   215   -   -   286   -   271

   Year Ended December 31, 2011
       Reversal of
         Prior Period
   Interest Interest Interest
 Company Expense Income Expense
           
   (in thousands)
 APCo $ 737 $ 3,229 $ 2,416
 I&M   -   2,681   638
 OPCo   1,213   5,173   4,019
 PSO   239   344   3,123
 SWEPCo   1,382   1,991   2,255
Amounts Accrued for Interest Related to Uncertain Tax Positions
   December 31,
 Company 2013 2012
   (in thousands)
 APCo $ - $ -
 I&M   -   -
 OPCo   -   -
 PSO   209   15
 SWEPCo   172   -

   December 31,
 Company 2013 2012
   (in thousands)
 APCo $ 158 $ 271
 I&M   957   1,337
 OPCo   407   451
 PSO   562   424
 SWEPCo   1,167   1,061
Reconciliation of Beginning and Ending Unrecognized Tax Benefits
 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2013$ 5,253 $ 15,085 $ 11,052 $ 2,273 $ 9,553
Increase - Tax Positions Taken During              
  a Prior Period  -   -   -   -   -
Decrease - Tax Positions Taken During              
  a Prior Period  (4,089)   (11,921)   (8,966)   (103)   (3,158)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   14   1,301
Decrease - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Settlements with Taxing              
  Authorities  -   -   -   -   (94)
Decrease - Lapse of the Applicable              
  Statute of Limitations  -   -   -   -   -
Balance as of December 31, 2013$ 1,164 $ 3,164 $ 2,086 $ 2,184 $ 7,602

 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
Unrecognized Tax Benefits Affecting Effective Tax Rate
 Company 2013 2012 2011
   (in thousands)
 APCo $ - $ - $ 806
 I&M   1,220   1,220   654
 OPCo   674   674   21,177
 PSO   827   818   1,882
 SWEPCo   4,357   3,512   3,717
Indiana Michigan Power Co [Member]
 
Details of Income Taxes as Reported
Year Ended December 31, 2013 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ 58,441 $ (49,067) $ 92,625 $ 7,689 $ (10,866)
 Deferred   75,714   129,109   134,463   53,788   81,888
 Deferred Investment Tax Credits   (1,220)   (4,931)   (1,418)   4,408   (1,561)
Income Tax Expense  $ 132,935 $ 75,111 $ 225,670 $ 65,885 $ 69,461
                 
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
Reconciliation of Federal Statutory Tax Rate to Reported Tax Rate
I&MYears Ended December 31,
 2013 2012 2011
 (in thousands)
Net Income$ 177,504 $ 118,457 $ 149,674
Income Tax Expense  75,111   39,344   51,760
Pretax Income$ 252,615 $ 157,801 $ 201,434
         
Income Taxes on Pretax Income at Statutory Rate (35%)$ 88,415 $ 55,230 $ 70,502
Increase (Decrease) in Income Taxes Resulting from the Following Items:        
  Depreciation  10,057   8,659   7,895
  Investment Tax Credits, Net  (4,931)   (4,502)   (2,783)
  State and Local Income Taxes, Net  (882)   (1,559)   (1,376)
  Removal Costs  (9,432)   (5,490)   (5,566)
  AFUDC  (10,555)   (7,218)   (9,223)
  Other  2,439   (5,776)   (7,689)
Income Tax Expense$ 75,111 $ 39,344 $ 51,760
         
Effective Income Tax Rate  29.7%   24.9%   25.7%
Reconciliation of Significant Temporary Differences
 I&M December 31,
   2013 2012
   (in thousands)
 Deferred Tax Assets $ 843,630 $ 831,724
 Deferred Tax Liabilities   (2,043,810)   (1,842,791)
 Net Deferred Tax Liabilities $ (1,200,180) $ (1,011,067)
        
 Property Related Temporary Differences $ (390,829) $ (351,682)
 Amounts Due from Customers for Future Federal Income Taxes   (39,137)   (37,633)
 Deferred State Income Taxes   (137,162)   (112,388)
 Deferred Income Taxes on Other Comprehensive Loss   8,351   15,553
 Accrued Nuclear Decommissioning   (553,794)   (475,223)
 Net Operating Loss Carryforward   15,690   31,233
 Regulatory Assets   (59,008)   (88,696)
 All Other, Net   (44,291)   7,769
 Net Deferred Tax Liabilities $ (1,200,180) $ (1,011,067)
State Net Income Tax Operating Loss Carryforwards
      State Net Income   
     Tax Operating  
     Loss Year of
 Company State Carryforward Expiration
      (in thousands)   
 APCo Tennessee $ 8,810  2026
 APCo Virginia   300,637  2031
 APCo West Virginia   489,860  2032
 I&M Indiana   50,425  2033
 OPCo West Virginia   235,636  2032
 PSO Oklahoma   110,615  2033
 SWEPCo Louisiana   422,946  2028
 SWEPCo Oklahoma   2,835  2033
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 $ 21,432 $ 8,504 $ 76,481 $ 28,255
 I&M   2,587   2,587   -   -
 OPCo   20,000   1,714   -   -
 PSO   565   543   21,114   21,114
 SWEPCo   884   759   -   -
Summary of Interest Income, Expense And Reversal
  Years Ended December 31,
  2013 2012
      Reversal of     Reversal of
      Prior Period     Prior Period
  Interest Interest Interest Interest Interest Interest
Company Expense Income Expense Expense Income Expense
  (in thousands)
APCo $ - $ 1,089 $ - $ 62 $ - $ 183
I&M   -   597   -   1,355   -   -
OPCo   -   1,892   -   266   -   504
PSO   -   135   -   259   -   294
SWEPCo   215   -   -   286   -   271

   Year Ended December 31, 2011
       Reversal of
         Prior Period
   Interest Interest Interest
 Company Expense Income Expense
           
   (in thousands)
 APCo $ 737 $ 3,229 $ 2,416
 I&M   -   2,681   638
 OPCo   1,213   5,173   4,019
 PSO   239   344   3,123
 SWEPCo   1,382   1,991   2,255
Amounts Accrued for Interest Related to Uncertain Tax Positions
   December 31,
 Company 2013 2012
   (in thousands)
 APCo $ - $ -
 I&M   -   -
 OPCo   -   -
 PSO   209   15
 SWEPCo   172   -

   December 31,
 Company 2013 2012
   (in thousands)
 APCo $ 158 $ 271
 I&M   957   1,337
 OPCo   407   451
 PSO   562   424
 SWEPCo   1,167   1,061
Reconciliation of Beginning and Ending Unrecognized Tax Benefits
 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2013$ 5,253 $ 15,085 $ 11,052 $ 2,273 $ 9,553
Increase - Tax Positions Taken During              
  a Prior Period  -   -   -   -   -
Decrease - Tax Positions Taken During              
  a Prior Period  (4,089)   (11,921)   (8,966)   (103)   (3,158)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   14   1,301
Decrease - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Settlements with Taxing              
  Authorities  -   -   -   -   (94)
Decrease - Lapse of the Applicable              
  Statute of Limitations  -   -   -   -   -
Balance as of December 31, 2013$ 1,164 $ 3,164 $ 2,086 $ 2,184 $ 7,602

 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
Unrecognized Tax Benefits Affecting Effective Tax Rate
 Company 2013 2012 2011
   (in thousands)
 APCo $ - $ - $ 806
 I&M   1,220   1,220   654
 OPCo   674   674   21,177
 PSO   827   818   1,882
 SWEPCo   4,357   3,512   3,717
Ohio Power Co [Member]
 
Details of Income Taxes as Reported
Year Ended December 31, 2013 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ 58,441 $ (49,067) $ 92,625 $ 7,689 $ (10,866)
 Deferred   75,714   129,109   134,463   53,788   81,888
 Deferred Investment Tax Credits   (1,220)   (4,931)   (1,418)   4,408   (1,561)
Income Tax Expense  $ 132,935 $ 75,111 $ 225,670 $ 65,885 $ 69,461
                 
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
Reconciliation of Federal Statutory Tax Rate to Reported Tax Rate
OPCoYears Ended December 31,
 2013 2012 2011
 (in thousands)
Net Income$ 409,980 $ 343,534 $ 464,993
Income Tax Expense  225,670   144,283   213,697
Pretax Income$ 635,650 $ 487,817 $ 678,690
         
Income Taxes on Pretax Income at Statutory Rate (35%)$ 222,478 $ 170,736 $ 237,542
Increase (Decrease) in Income Taxes Resulting from the Following Items:        
  Depreciation  6,759   5,239   6,368
  Investment Tax Credits, Net  (1,418)   (1,849)   (2,380)
  State and Local Income Taxes, Net  3,327   (18,291)   (3,222)
  Parent Company Loss Benefit  (2,154)   (11,915)   (7,117)
  Other  (3,322)   363   (17,494)
Income Tax Expense$ 225,670 $ 144,283 $ 213,697
         
Effective Income Tax Rate  35.5%   29.6%   31.5%
Reconciliation of Significant Temporary Differences
 OPCo December 31,
   2013 2012
   (in thousands)
 Deferred Tax Assets $ 183,085 $ 505,003
 Deferred Tax Liabilities   (1,477,691)   (2,851,068)
 Net Deferred Tax Liabilities $ (1,294,606) $ (2,346,065)
        
 Property Related Temporary Differences $ (841,607) $ (2,061,841)
 Amounts Due from Customers for Future Federal Income Taxes   (51,946)   (59,291)
 Deferred State Income Taxes   (28,569)   (90,001)
 Regulatory Assets   (215,535)   (190,273)
 Deferred Income Taxes on Other Comprehensive Loss   (3,812)   89,236
 Impairment Loss   -   100,459
 Deferred Fuel and Purchased Power   (176,192)   (199,997)
 All Other, Net   23,055   65,643
 Net Deferred Tax Liabilities $ (1,294,606) $ (2,346,065)
State Net Income Tax Operating Loss Carryforwards
      State Net Income   
     Tax Operating  
     Loss Year of
 Company State Carryforward Expiration
      (in thousands)   
 APCo Tennessee $ 8,810  2026
 APCo Virginia   300,637  2031
 APCo West Virginia   489,860  2032
 I&M Indiana   50,425  2033
 OPCo West Virginia   235,636  2032
 PSO Oklahoma   110,615  2033
 SWEPCo Louisiana   422,946  2028
 SWEPCo Oklahoma   2,835  2033
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 $ 21,432 $ 8,504 $ 76,481 $ 28,255
 I&M   2,587   2,587   -   -
 OPCo   20,000   1,714   -   -
 PSO   565   543   21,114   21,114
 SWEPCo   884   759   -   -
Summary of Interest Income, Expense And Reversal
  Years Ended December 31,
  2013 2012
      Reversal of     Reversal of
      Prior Period     Prior Period
  Interest Interest Interest Interest Interest Interest
Company Expense Income Expense Expense Income Expense
  (in thousands)
APCo $ - $ 1,089 $ - $ 62 $ - $ 183
I&M   -   597   -   1,355   -   -
OPCo   -   1,892   -   266   -   504
PSO   -   135   -   259   -   294
SWEPCo   215   -   -   286   -   271

   Year Ended December 31, 2011
       Reversal of
         Prior Period
   Interest Interest Interest
 Company Expense Income Expense
           
   (in thousands)
 APCo $ 737 $ 3,229 $ 2,416
 I&M   -   2,681   638
 OPCo   1,213   5,173   4,019
 PSO   239   344   3,123
 SWEPCo   1,382   1,991   2,255
Amounts Accrued for Interest Related to Uncertain Tax Positions
   December 31,
 Company 2013 2012
   (in thousands)
 APCo $ - $ -
 I&M   -   -
 OPCo   -   -
 PSO   209   15
 SWEPCo   172   -

   December 31,
 Company 2013 2012
   (in thousands)
 APCo $ 158 $ 271
 I&M   957   1,337
 OPCo   407   451
 PSO   562   424
 SWEPCo   1,167   1,061
Reconciliation of Beginning and Ending Unrecognized Tax Benefits
 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2013$ 5,253 $ 15,085 $ 11,052 $ 2,273 $ 9,553
Increase - Tax Positions Taken During              
  a Prior Period  -   -   -   -   -
Decrease - Tax Positions Taken During              
  a Prior Period  (4,089)   (11,921)   (8,966)   (103)   (3,158)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   14   1,301
Decrease - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Settlements with Taxing              
  Authorities  -   -   -   -   (94)
Decrease - Lapse of the Applicable              
  Statute of Limitations  -   -   -   -   -
Balance as of December 31, 2013$ 1,164 $ 3,164 $ 2,086 $ 2,184 $ 7,602

 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
Unrecognized Tax Benefits Affecting Effective Tax Rate
 Company 2013 2012 2011
   (in thousands)
 APCo $ - $ - $ 806
 I&M   1,220   1,220   654
 OPCo   674   674   21,177
 PSO   827   818   1,882
 SWEPCo   4,357   3,512   3,717
Public Service Co of Oklahoma [Member]
 
Details of Income Taxes as Reported
Year Ended December 31, 2013 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ 58,441 $ (49,067) $ 92,625 $ 7,689 $ (10,866)
 Deferred   75,714   129,109   134,463   53,788   81,888
 Deferred Investment Tax Credits   (1,220)   (4,931)   (1,418)   4,408   (1,561)
Income Tax Expense  $ 132,935 $ 75,111 $ 225,670 $ 65,885 $ 69,461
                 
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
Reconciliation of Federal Statutory Tax Rate to Reported Tax Rate
PSOYears Ended December 31,
 2013 2012 2011
 (in thousands)
Net Income$ 97,796 $ 114,141 $ 124,628
Income Tax Expense  65,885   66,694   67,629
Pretax Income$ 163,681 $ 180,835 $ 192,257
         
Income Taxes on Pretax Income at Statutory Rate (35%)$ 57,288 $ 63,292 $ 67,290
Increase (Decrease) in Income Taxes Resulting from the Following Items:        
  Depreciation  164   (10)   (165)
  Investment Tax Credits, Net  (776)   (781)   (781)
  State and Local Income Taxes, Net  5,423   6,953   4,744
  Tax Adjustments  5,268   201   (1,827)
  Other  (1,482)   (2,961)   (1,632)
Income Tax Expense$ 65,885 $ 66,694 $ 67,629
         
Effective Income Tax Rate  40.3%   36.9%   35.2%
Reconciliation of Significant Temporary Differences
 PSO December 31,
   2013 2012
   (in thousands)
 Deferred Tax Assets $ 107,567 $ 101,561
 Deferred Tax Liabilities   (936,791)   (835,054)
 Net Deferred Tax Liabilities $ (829,224) $ (733,493)
        
 Property Related Temporary Differences $ (736,160) $ (640,859)
 Amounts Due from Customers for Future Federal Income Taxes   (31)   (1,325)
 Deferred State Income Taxes   (99,126)   (95,378)
 Regulatory Assets   (39,414)   (57,367)
 Deferred Income Taxes on Other Comprehensive Loss   (3,100)   (3,489)
 Deferred Federal Income Taxes on Deferred State Income Taxes   40,362   39,050
 Net Operating Loss Carryforward   4,314   3,892
 Tax Credit Carryforward   565   401
 All Other, Net   3,366   21,582
 Net Deferred Tax Liabilities $ (829,224) $ (733,493)
State Net Income Tax Operating Loss Carryforwards
      State Net Income   
     Tax Operating  
     Loss Year of
 Company State Carryforward Expiration
      (in thousands)   
 APCo Tennessee $ 8,810  2026
 APCo Virginia   300,637  2031
 APCo West Virginia   489,860  2032
 I&M Indiana   50,425  2033
 OPCo West Virginia   235,636  2032
 PSO Oklahoma   110,615  2033
 SWEPCo Louisiana   422,946  2028
 SWEPCo Oklahoma   2,835  2033
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 $ 21,432 $ 8,504 $ 76,481 $ 28,255
 I&M   2,587   2,587   -   -
 OPCo   20,000   1,714   -   -
 PSO   565   543   21,114   21,114
 SWEPCo   884   759   -   -
Summary of Interest Income, Expense And Reversal
  Years Ended December 31,
  2013 2012
      Reversal of     Reversal of
      Prior Period     Prior Period
  Interest Interest Interest Interest Interest Interest
Company Expense Income Expense Expense Income Expense
  (in thousands)
APCo $ - $ 1,089 $ - $ 62 $ - $ 183
I&M   -   597   -   1,355   -   -
OPCo   -   1,892   -   266   -   504
PSO   -   135   -   259   -   294
SWEPCo   215   -   -   286   -   271

   Year Ended December 31, 2011
       Reversal of
         Prior Period
   Interest Interest Interest
 Company Expense Income Expense
           
   (in thousands)
 APCo $ 737 $ 3,229 $ 2,416
 I&M   -   2,681   638
 OPCo   1,213   5,173   4,019
 PSO   239   344   3,123
 SWEPCo   1,382   1,991   2,255
Amounts Accrued for Interest Related to Uncertain Tax Positions
   December 31,
 Company 2013 2012
   (in thousands)
 APCo $ - $ -
 I&M   -   -
 OPCo   -   -
 PSO   209   15
 SWEPCo   172   -

   December 31,
 Company 2013 2012
   (in thousands)
 APCo $ 158 $ 271
 I&M   957   1,337
 OPCo   407   451
 PSO   562   424
 SWEPCo   1,167   1,061
Reconciliation of Beginning and Ending Unrecognized Tax Benefits
 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2013$ 5,253 $ 15,085 $ 11,052 $ 2,273 $ 9,553
Increase - Tax Positions Taken During              
  a Prior Period  -   -   -   -   -
Decrease - Tax Positions Taken During              
  a Prior Period  (4,089)   (11,921)   (8,966)   (103)   (3,158)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   14   1,301
Decrease - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Settlements with Taxing              
  Authorities  -   -   -   -   (94)
Decrease - Lapse of the Applicable              
  Statute of Limitations  -   -   -   -   -
Balance as of December 31, 2013$ 1,164 $ 3,164 $ 2,086 $ 2,184 $ 7,602

 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
Unrecognized Tax Benefits Affecting Effective Tax Rate
 Company 2013 2012 2011
   (in thousands)
 APCo $ - $ - $ 806
 I&M   1,220   1,220   654
 OPCo   674   674   21,177
 PSO   827   818   1,882
 SWEPCo   4,357   3,512   3,717
Southwestern Electric Power Co [Member]
 
Details of Income Taxes as Reported
Year Ended December 31, 2013 APCo I&M OPCo PSO SWEPCo
   (in thousands)
Income Tax Expense (Credit):               
 Current $ 58,441 $ (49,067) $ 92,625 $ 7,689 $ (10,866)
 Deferred   75,714   129,109   134,463   53,788   81,888
 Deferred Investment Tax Credits   (1,220)   (4,931)   (1,418)   4,408   (1,561)
Income Tax Expense  $ 132,935 $ 75,111 $ 225,670 $ 65,885 $ 69,461
                 
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
Reconciliation of Federal Statutory Tax Rate to Reported Tax Rate
SWEPCoYears Ended December 31,
 2013 2012 2011
 (in thousands)
Net Income$ 153,819 $ 202,513 $ 165,126
Income Tax Expense  69,461   45,858   56,903
Pretax Income$ 223,280 $ 248,371 $ 222,029
         
Income Taxes on Pretax Income at Statutory Rate (35%)$ 78,148 $ 86,930 $ 77,710
Increase (Decrease) in Income Taxes Resulting from the Following Items:        
  Depreciation  3,086   2,105   (7)
  Depletion  (3,472)   (3,276)   (1,506)
  Investment Tax Credits, Net  (1,561)   (550)   (550)
  State and Local Income Taxes, Net  (1,453)   (18,010)   4,004
  AFUDC  (2,381)   (19,879)   (16,962)
  Other  (2,906)   (1,462)   (5,786)
Income Tax Expense$ 69,461 $ 45,858 $ 56,903
         
Effective Income Tax Rate  31.1%   18.5%   25.6%
Reconciliation of Significant Temporary Differences
 SWEPCo December 31,
   2013 2012
   (in thousands)
 Deferred Tax Assets $ 359,529 $ 286,133
 Deferred Tax Liabilities   (1,453,710)   (1,260,281)
 Net Deferred Tax Liabilities $ (1,094,181) $ (974,148)
        
 Property Related Temporary Differences $ (1,172,431) $ (997,337)
 Amounts Due from Customers for Future Federal Income Taxes   (43,116)   (43,090)
 Deferred State Income Taxes   (118,179)   (98,630)
 Regulatory Assets   (5,290)   (12,922)
 Deferred Income Taxes on Other Comprehensive Loss   4,548   9,618
 Impairment Loss - Turk Plant   21,295   21,700
 Net Operating Loss Carryforward   189,128   104,738
 All Other, Net   29,864   41,775
 Net Deferred Tax Liabilities $ (1,094,181) $ (974,148)
State Net Income Tax Operating Loss Carryforwards
      State Net Income   
     Tax Operating  
     Loss Year of
 Company State Carryforward Expiration
      (in thousands)   
 APCo Tennessee $ 8,810  2026
 APCo Virginia   300,637  2031
 APCo West Virginia   489,860  2032
 I&M Indiana   50,425  2033
 OPCo West Virginia   235,636  2032
 PSO Oklahoma   110,615  2033
 SWEPCo Louisiana   422,946  2028
 SWEPCo Oklahoma   2,835  2033
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 $ 21,432 $ 8,504 $ 76,481 $ 28,255
 I&M   2,587   2,587   -   -
 OPCo   20,000   1,714   -   -
 PSO   565   543   21,114   21,114
 SWEPCo   884   759   -   -
Summary of Interest Income, Expense And Reversal
  Years Ended December 31,
  2013 2012
      Reversal of     Reversal of
      Prior Period     Prior Period
  Interest Interest Interest Interest Interest Interest
Company Expense Income Expense Expense Income Expense
  (in thousands)
APCo $ - $ 1,089 $ - $ 62 $ - $ 183
I&M   -   597   -   1,355   -   -
OPCo   -   1,892   -   266   -   504
PSO   -   135   -   259   -   294
SWEPCo   215   -   -   286   -   271

   Year Ended December 31, 2011
       Reversal of
         Prior Period
   Interest Interest Interest
 Company Expense Income Expense
           
   (in thousands)
 APCo $ 737 $ 3,229 $ 2,416
 I&M   -   2,681   638
 OPCo   1,213   5,173   4,019
 PSO   239   344   3,123
 SWEPCo   1,382   1,991   2,255
Amounts Accrued for Interest Related to Uncertain Tax Positions
   December 31,
 Company 2013 2012
   (in thousands)
 APCo $ - $ -
 I&M   -   -
 OPCo   -   -
 PSO   209   15
 SWEPCo   172   -

   December 31,
 Company 2013 2012
   (in thousands)
 APCo $ 158 $ 271
 I&M   957   1,337
 OPCo   407   451
 PSO   562   424
 SWEPCo   1,167   1,061
Reconciliation of Beginning and Ending Unrecognized Tax Benefits
 APCo I&M OPCo PSO SWEPCo
 (in thousands)
Balance as of January 1, 2013$ 5,253 $ 15,085 $ 11,052 $ 2,273 $ 9,553
Increase - Tax Positions Taken During              
  a Prior Period  -   -   -   -   -
Decrease - Tax Positions Taken During              
  a Prior Period  (4,089)   (11,921)   (8,966)   (103)   (3,158)
Increase - Tax Positions Taken During              
  the Current Year  -   -   -   14   1,301
Decrease - Tax Positions Taken During              
  the Current Year  -   -   -   -   -
Decrease - Settlements with Taxing              
  Authorities  -   -   -   -   (94)
Decrease - Lapse of the Applicable              
  Statute of Limitations  -   -   -   -   -
Balance as of December 31, 2013$ 1,164 $ 3,164 $ 2,086 $ 2,184 $ 7,602

 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
Unrecognized Tax Benefits Affecting Effective Tax Rate
 Company 2013 2012 2011
   (in thousands)
 APCo $ - $ - $ 806
 I&M   1,220   1,220   654
 OPCo   674   674   21,177
 PSO   827   818   1,882
 SWEPCo   4,357   3,512   3,717