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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2012
Appalachian Power Co [Member]
  
Affiliated Revenues
Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2012               
 Sales under Interconnection Agreement $ 166,733 $ 265,923 $ 643,486 $ - $ -
 Direct Sales to East Affiliates   124,519   -   136,142   34   142
 Direct Sales to West Affiliates   314   218   454   18,861   23,695
 Direct Sales to AEPEP   -   -   -   -   (583)
 Transmission Agreement and Transmission               
  Coordination Agreement Sales   (1,289)   758   26,295   8   12,338
 Natural Gas Contracts with AEPES   -   -   -   -   -
 Other Revenues   27,922   1,509   40,917   3,700   1,849
 Total Affiliated Revenues $ 318,199 $ 268,408 $ 847,294 $ 22,603 $ 37,441

Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2011               
 Sales under Interconnection Agreement $ 186,788 $ 308,336 $ 823,703 $ - $ -
 Direct Sales to East Affiliates   126,737   -   115,120   124   3,535
 Direct Sales to West Affiliates   1,492   908   1,936   10,624   43,714
 Direct Sales to AEPEP   -   -   -   -   (637)
 Transmission Agreement and Transmission                
  Coordination Agreement Sales   2,348   9,379   3,375   111   8,962
 Natural Gas Contracts with AEPES   154   92   196   3   4
 Other Revenues   42,283   1,469   33,669   3,330   2,037
 Total Affiliated Revenues $ 359,802 $ 320,184 $ 977,999 $ 14,192 $ 57,615

Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2010               
 Sales under Interconnection Agreement $ 158,873 $ 327,992 $ 839,441 $ - $ -
 Direct Sales to East Affiliates   123,832   -   115,406   1,210   1,248
 Direct Sales to West Affiliates   3,471   1,931   4,125   19,629   39,851
 Direct Sales to AEPEP   -   -   -   -   (286)
 Direct Sales to Transmission Companies   44   1,848   236   30   1
 Natural Gas Contracts with AEPES   (2,171)   (1,087)   (2,330)   2   3
 Other Revenues   32,158   267   34,407   2,657   11,053
 Total Affiliated Revenues $ 316,207 $ 330,951 $ 991,285 $ 23,528 $ 51,870
Affiliated Purchases
Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2012               
 Purchases under Interconnection Agreement $ 661,185 $ 147,502 $ 174,240 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   683   368
 Direct Purchases from West Affiliates   53   36   75   23,695   18,861
 Purchases from AEGCo   -   238,866   203,583   -   -
 Gas Purchases from AEPES   -   -   2,808   -   -
 Total Affiliated Purchases $ 661,238 $ 386,404 $ 380,706 $ 24,378 $ 19,229

Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2011               
 Purchases under Interconnection Agreement $ 818,943 $ 124,598 $ 326,871 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   6,378   1,184
 Direct Purchases from West Affiliates   239   147   312   43,714   10,624
 Purchases from AEGCo   -   228,739   185,741   -   -
 Gas Purchases from AEPES   -   -   2,689   -   -
 Total Affiliated Purchases $ 819,182 $ 353,484 $ 515,613 $ 50,092 $ 11,808

Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2010               
 Purchases under Interconnection Agreement $ 916,791 $ 91,129 $ 268,964 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   6,162   4,078
 Direct Purchases from West Affiliates   825   466   996   39,851   19,629
 Direct Purchases from AEGCo   -   235,740   113,801   -   -
 Gas Purchases from AEPES   -   -   2,857   -   -
 Total Affiliated Purchases $ 917,616 $ 327,335 $ 386,618 $ 46,013 $ 23,707
Transmission Agreement
    Years Ended December 31,
 Company 2012 2011
   (in thousands)
 APCo $ 20,264 $ 4,608
 I&M   5,689   1,538
 OPCo   6,090   17,186
Original Transmission Agreement
    Year Ended
 Company December 31, 2010
   (in thousands)
 APCo $ (16,079)
 I&M   (25,188)
 OPCo   49,281
Coal Transloading
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 942 $ 31 $ -
 I&M   32,639   21,852   17,208
Railcar Maintenance
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 88 $ 9 $ 7
 I&M   3,343   3,012   1,870
 PSO   281   542   522
 SWEPCo   2,102   2,348   1,044
Barging, Urea Transloading and Other Services
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 AEGCo $ 19,961 $ 15,460 $ 12,548
 APCo   34,725   27,455   28,241
 KPCo   74   122   133
 OPCo   39,956   36,980   44,160
 AEP River Operations LLC – (Nonutility         
  Subsidiary of AEP)   20,917   25,356   20,729
Central Machine Shop
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 AEGCo $ 80 $ 102 $ 180
 I&M   1,280   2,157   2,112
 KPCo   277   298   368
 OPCo   3,838   3,684   3,665
 PSO   1,198   53   412
 SWEPCo   145   946   560
Affiliate Coal Purchases
   Year Ended
 Company December 31, 2010
   (in thousands)
 APCo $ 2,830
 I&M   1,383
 KPCo   837
 PSO   796
 SWEPCo   1,526
Affiliate Railcar Agreement
 December 31, 2012
 Billing Company
                  
 Billed Company APCo I&M OPCo PSO SWEPCo
   (in thousands)
 APCo $ - $ 2 $ 1,960 $ - $ 2
 I&M   148   -   889   48   843
 KPCo   98   -   41   -   -
 OPCo   854   170   -   5   99
 PSO   204   322   74   -   176
 SWEPCo   543   1,468   321   21   -

 December 31, 2011
 Billing Company
                  
 Billed Company APCo I&M OPCo PSO SWEPCo
   (in thousands)
 APCo $ - $ - $ 1,373 $ - $ -
 I&M   91   -   1,190   80   787
 KPCo   289   -   355   -   -
 OPCo   840   170   -   8   66
 PSO   289   842   234   -   382
 SWEPCo   12   2,662   605   91   -
Ownership and Investment in OVEC
    December 31, 2012
 Company Ownership Investment
         
      (in thousands)
 AEP  39.17% $ 3,978
 OPCo  4.30%   430
 Total  43.47% $ 4,408
Purchased Power from OVEC
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 98,417 $ 114,311 $ 105,307
 I&M   49,239   57,192   52,687
 OPCo   125,013   145,207   133,776
Purchases from OVEC under Interconnection Agreement
    Year Ended
 Company December 31, 2011
   (in thousands)
 APCo $ 21,110
 I&M   12,942
 OPCo   27,566

    Year Ended December 31, 2010
    Reported in Reported in
 Company Revenues Expenses
         
   (in thousands)
 APCo $ 6,631 $ 3,635
 I&M   3,721   1,980
 OPCo   7,937   4,231
Related Party Sales of Property
 Sales         
   Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 6,643 $ 3,978 $ 2,004
 I&M   3,296   441   1,842
 OPCo   4,163   12,113   8,919
 PSO   1,782   442   2,156
 SWEPCo   1,731   650   5,233
Related Party Purchases of Property
 Purchases         
   Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 2,522 $ 2,312 $ 4,732
 I&M   285   3,678   4,117
 OPCo   10,608   3,045   1,652
 PSO   1,867   475   5,146
 SWEPCo   7,266   2,993   2,612
Indiana Michigan Power Co [Member]
  
Affiliated Revenues
Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2012               
 Sales under Interconnection Agreement $ 166,733 $ 265,923 $ 643,486 $ - $ -
 Direct Sales to East Affiliates   124,519   -   136,142   34   142
 Direct Sales to West Affiliates   314   218   454   18,861   23,695
 Direct Sales to AEPEP   -   -   -   -   (583)
 Transmission Agreement and Transmission               
  Coordination Agreement Sales   (1,289)   758   26,295   8   12,338
 Natural Gas Contracts with AEPES   -   -   -   -   -
 Other Revenues   27,922   1,509   40,917   3,700   1,849
 Total Affiliated Revenues $ 318,199 $ 268,408 $ 847,294 $ 22,603 $ 37,441

Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2011               
 Sales under Interconnection Agreement $ 186,788 $ 308,336 $ 823,703 $ - $ -
 Direct Sales to East Affiliates   126,737   -   115,120   124   3,535
 Direct Sales to West Affiliates   1,492   908   1,936   10,624   43,714
 Direct Sales to AEPEP   -   -   -   -   (637)
 Transmission Agreement and Transmission                
  Coordination Agreement Sales   2,348   9,379   3,375   111   8,962
 Natural Gas Contracts with AEPES   154   92   196   3   4
 Other Revenues   42,283   1,469   33,669   3,330   2,037
 Total Affiliated Revenues $ 359,802 $ 320,184 $ 977,999 $ 14,192 $ 57,615

Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2010               
 Sales under Interconnection Agreement $ 158,873 $ 327,992 $ 839,441 $ - $ -
 Direct Sales to East Affiliates   123,832   -   115,406   1,210   1,248
 Direct Sales to West Affiliates   3,471   1,931   4,125   19,629   39,851
 Direct Sales to AEPEP   -   -   -   -   (286)
 Direct Sales to Transmission Companies   44   1,848   236   30   1
 Natural Gas Contracts with AEPES   (2,171)   (1,087)   (2,330)   2   3
 Other Revenues   32,158   267   34,407   2,657   11,053
 Total Affiliated Revenues $ 316,207 $ 330,951 $ 991,285 $ 23,528 $ 51,870
Affiliated Purchases
Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2012               
 Purchases under Interconnection Agreement $ 661,185 $ 147,502 $ 174,240 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   683   368
 Direct Purchases from West Affiliates   53   36   75   23,695   18,861
 Purchases from AEGCo   -   238,866   203,583   -   -
 Gas Purchases from AEPES   -   -   2,808   -   -
 Total Affiliated Purchases $ 661,238 $ 386,404 $ 380,706 $ 24,378 $ 19,229

Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2011               
 Purchases under Interconnection Agreement $ 818,943 $ 124,598 $ 326,871 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   6,378   1,184
 Direct Purchases from West Affiliates   239   147   312   43,714   10,624
 Purchases from AEGCo   -   228,739   185,741   -   -
 Gas Purchases from AEPES   -   -   2,689   -   -
 Total Affiliated Purchases $ 819,182 $ 353,484 $ 515,613 $ 50,092 $ 11,808

Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2010               
 Purchases under Interconnection Agreement $ 916,791 $ 91,129 $ 268,964 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   6,162   4,078
 Direct Purchases from West Affiliates   825   466   996   39,851   19,629
 Direct Purchases from AEGCo   -   235,740   113,801   -   -
 Gas Purchases from AEPES   -   -   2,857   -   -
 Total Affiliated Purchases $ 917,616 $ 327,335 $ 386,618 $ 46,013 $ 23,707
Transmission Agreement
    Years Ended December 31,
 Company 2012 2011
   (in thousands)
 APCo $ 20,264 $ 4,608
 I&M   5,689   1,538
 OPCo   6,090   17,186
Original Transmission Agreement
    Year Ended
 Company December 31, 2010
   (in thousands)
 APCo $ (16,079)
 I&M   (25,188)
 OPCo   49,281
Coal Transloading
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 942 $ 31 $ -
 I&M   32,639   21,852   17,208
Railcar Maintenance
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 88 $ 9 $ 7
 I&M   3,343   3,012   1,870
 PSO   281   542   522
 SWEPCo   2,102   2,348   1,044
Barging, Urea Transloading and Other Services
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 AEGCo $ 19,961 $ 15,460 $ 12,548
 APCo   34,725   27,455   28,241
 KPCo   74   122   133
 OPCo   39,956   36,980   44,160
 AEP River Operations LLC – (Nonutility         
  Subsidiary of AEP)   20,917   25,356   20,729
Central Machine Shop
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 AEGCo $ 80 $ 102 $ 180
 I&M   1,280   2,157   2,112
 KPCo   277   298   368
 OPCo   3,838   3,684   3,665
 PSO   1,198   53   412
 SWEPCo   145   946   560
Affiliate Coal Purchases
   Year Ended
 Company December 31, 2010
   (in thousands)
 APCo $ 2,830
 I&M   1,383
 KPCo   837
 PSO   796
 SWEPCo   1,526
Affiliate Railcar Agreement
 December 31, 2012
 Billing Company
                  
 Billed Company APCo I&M OPCo PSO SWEPCo
   (in thousands)
 APCo $ - $ 2 $ 1,960 $ - $ 2
 I&M   148   -   889   48   843
 KPCo   98   -   41   -   -
 OPCo   854   170   -   5   99
 PSO   204   322   74   -   176
 SWEPCo   543   1,468   321   21   -

 December 31, 2011
 Billing Company
                  
 Billed Company APCo I&M OPCo PSO SWEPCo
   (in thousands)
 APCo $ - $ - $ 1,373 $ - $ -
 I&M   91   -   1,190   80   787
 KPCo   289   -   355   -   -
 OPCo   840   170   -   8   66
 PSO   289   842   234   -   382
 SWEPCo   12   2,662   605   91   -
Ownership and Investment in OVEC
    December 31, 2012
 Company Ownership Investment
         
      (in thousands)
 AEP  39.17% $ 3,978
 OPCo  4.30%   430
 Total  43.47% $ 4,408
Purchased Power from OVEC
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 98,417 $ 114,311 $ 105,307
 I&M   49,239   57,192   52,687
 OPCo   125,013   145,207   133,776
Purchases from OVEC under Interconnection Agreement
    Year Ended
 Company December 31, 2011
   (in thousands)
 APCo $ 21,110
 I&M   12,942
 OPCo   27,566

    Year Ended December 31, 2010
    Reported in Reported in
 Company Revenues Expenses
         
   (in thousands)
 APCo $ 6,631 $ 3,635
 I&M   3,721   1,980
 OPCo   7,937   4,231
Related Party Sales of Property
 Sales         
   Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 6,643 $ 3,978 $ 2,004
 I&M   3,296   441   1,842
 OPCo   4,163   12,113   8,919
 PSO   1,782   442   2,156
 SWEPCo   1,731   650   5,233
Related Party Purchases of Property
 Purchases         
   Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 2,522 $ 2,312 $ 4,732
 I&M   285   3,678   4,117
 OPCo   10,608   3,045   1,652
 PSO   1,867   475   5,146
 SWEPCo   7,266   2,993   2,612
Ohio Power Co [Member]
  
Affiliated Revenues
Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2012               
 Sales under Interconnection Agreement $ 166,733 $ 265,923 $ 643,486 $ - $ -
 Direct Sales to East Affiliates   124,519   -   136,142   34   142
 Direct Sales to West Affiliates   314   218   454   18,861   23,695
 Direct Sales to AEPEP   -   -   -   -   (583)
 Transmission Agreement and Transmission               
  Coordination Agreement Sales   (1,289)   758   26,295   8   12,338
 Natural Gas Contracts with AEPES   -   -   -   -   -
 Other Revenues   27,922   1,509   40,917   3,700   1,849
 Total Affiliated Revenues $ 318,199 $ 268,408 $ 847,294 $ 22,603 $ 37,441

Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2011               
 Sales under Interconnection Agreement $ 186,788 $ 308,336 $ 823,703 $ - $ -
 Direct Sales to East Affiliates   126,737   -   115,120   124   3,535
 Direct Sales to West Affiliates   1,492   908   1,936   10,624   43,714
 Direct Sales to AEPEP   -   -   -   -   (637)
 Transmission Agreement and Transmission                
  Coordination Agreement Sales   2,348   9,379   3,375   111   8,962
 Natural Gas Contracts with AEPES   154   92   196   3   4
 Other Revenues   42,283   1,469   33,669   3,330   2,037
 Total Affiliated Revenues $ 359,802 $ 320,184 $ 977,999 $ 14,192 $ 57,615

Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2010               
 Sales under Interconnection Agreement $ 158,873 $ 327,992 $ 839,441 $ - $ -
 Direct Sales to East Affiliates   123,832   -   115,406   1,210   1,248
 Direct Sales to West Affiliates   3,471   1,931   4,125   19,629   39,851
 Direct Sales to AEPEP   -   -   -   -   (286)
 Direct Sales to Transmission Companies   44   1,848   236   30   1
 Natural Gas Contracts with AEPES   (2,171)   (1,087)   (2,330)   2   3
 Other Revenues   32,158   267   34,407   2,657   11,053
 Total Affiliated Revenues $ 316,207 $ 330,951 $ 991,285 $ 23,528 $ 51,870
Affiliated Purchases
Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2012               
 Purchases under Interconnection Agreement $ 661,185 $ 147,502 $ 174,240 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   683   368
 Direct Purchases from West Affiliates   53   36   75   23,695   18,861
 Purchases from AEGCo   -   238,866   203,583   -   -
 Gas Purchases from AEPES   -   -   2,808   -   -
 Total Affiliated Purchases $ 661,238 $ 386,404 $ 380,706 $ 24,378 $ 19,229

Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2011               
 Purchases under Interconnection Agreement $ 818,943 $ 124,598 $ 326,871 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   6,378   1,184
 Direct Purchases from West Affiliates   239   147   312   43,714   10,624
 Purchases from AEGCo   -   228,739   185,741   -   -
 Gas Purchases from AEPES   -   -   2,689   -   -
 Total Affiliated Purchases $ 819,182 $ 353,484 $ 515,613 $ 50,092 $ 11,808

Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2010               
 Purchases under Interconnection Agreement $ 916,791 $ 91,129 $ 268,964 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   6,162   4,078
 Direct Purchases from West Affiliates   825   466   996   39,851   19,629
 Direct Purchases from AEGCo   -   235,740   113,801   -   -
 Gas Purchases from AEPES   -   -   2,857   -   -
 Total Affiliated Purchases $ 917,616 $ 327,335 $ 386,618 $ 46,013 $ 23,707
Transmission Agreement
    Years Ended December 31,
 Company 2012 2011
   (in thousands)
 APCo $ 20,264 $ 4,608
 I&M   5,689   1,538
 OPCo   6,090   17,186
Original Transmission Agreement
    Year Ended
 Company December 31, 2010
   (in thousands)
 APCo $ (16,079)
 I&M   (25,188)
 OPCo   49,281
Coal Transloading
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 942 $ 31 $ -
 I&M   32,639   21,852   17,208
Railcar Maintenance
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 88 $ 9 $ 7
 I&M   3,343   3,012   1,870
 PSO   281   542   522
 SWEPCo   2,102   2,348   1,044
Barging, Urea Transloading and Other Services
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 AEGCo $ 19,961 $ 15,460 $ 12,548
 APCo   34,725   27,455   28,241
 KPCo   74   122   133
 OPCo   39,956   36,980   44,160
 AEP River Operations LLC – (Nonutility         
  Subsidiary of AEP)   20,917   25,356   20,729
Central Machine Shop
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 AEGCo $ 80 $ 102 $ 180
 I&M   1,280   2,157   2,112
 KPCo   277   298   368
 OPCo   3,838   3,684   3,665
 PSO   1,198   53   412
 SWEPCo   145   946   560
Affiliate Coal Purchases
   Year Ended
 Company December 31, 2010
   (in thousands)
 APCo $ 2,830
 I&M   1,383
 KPCo   837
 PSO   796
 SWEPCo   1,526
Affiliate Railcar Agreement
 December 31, 2012
 Billing Company
                  
 Billed Company APCo I&M OPCo PSO SWEPCo
   (in thousands)
 APCo $ - $ 2 $ 1,960 $ - $ 2
 I&M   148   -   889   48   843
 KPCo   98   -   41   -   -
 OPCo   854   170   -   5   99
 PSO   204   322   74   -   176
 SWEPCo   543   1,468   321   21   -

 December 31, 2011
 Billing Company
                  
 Billed Company APCo I&M OPCo PSO SWEPCo
   (in thousands)
 APCo $ - $ - $ 1,373 $ - $ -
 I&M   91   -   1,190   80   787
 KPCo   289   -   355   -   -
 OPCo   840   170   -   8   66
 PSO   289   842   234   -   382
 SWEPCo   12   2,662   605   91   -
Ownership and Investment in OVEC
    December 31, 2012
 Company Ownership Investment
         
      (in thousands)
 AEP  39.17% $ 3,978
 OPCo  4.30%   430
 Total  43.47% $ 4,408
Purchased Power from OVEC
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 98,417 $ 114,311 $ 105,307
 I&M   49,239   57,192   52,687
 OPCo   125,013   145,207   133,776
Purchases from OVEC under Interconnection Agreement
    Year Ended
 Company December 31, 2011
   (in thousands)
 APCo $ 21,110
 I&M   12,942
 OPCo   27,566

    Year Ended December 31, 2010
    Reported in Reported in
 Company Revenues Expenses
         
   (in thousands)
 APCo $ 6,631 $ 3,635
 I&M   3,721   1,980
 OPCo   7,937   4,231
Related Party Sales of Property
 Sales         
   Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 6,643 $ 3,978 $ 2,004
 I&M   3,296   441   1,842
 OPCo   4,163   12,113   8,919
 PSO   1,782   442   2,156
 SWEPCo   1,731   650   5,233
Related Party Purchases of Property
 Purchases         
   Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 2,522 $ 2,312 $ 4,732
 I&M   285   3,678   4,117
 OPCo   10,608   3,045   1,652
 PSO   1,867   475   5,146
 SWEPCo   7,266   2,993   2,612
Public Service Co of Oklahoma [Member]
  
Affiliated Revenues
Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2012               
 Sales under Interconnection Agreement $ 166,733 $ 265,923 $ 643,486 $ - $ -
 Direct Sales to East Affiliates   124,519   -   136,142   34   142
 Direct Sales to West Affiliates   314   218   454   18,861   23,695
 Direct Sales to AEPEP   -   -   -   -   (583)
 Transmission Agreement and Transmission               
  Coordination Agreement Sales   (1,289)   758   26,295   8   12,338
 Natural Gas Contracts with AEPES   -   -   -   -   -
 Other Revenues   27,922   1,509   40,917   3,700   1,849
 Total Affiliated Revenues $ 318,199 $ 268,408 $ 847,294 $ 22,603 $ 37,441

Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2011               
 Sales under Interconnection Agreement $ 186,788 $ 308,336 $ 823,703 $ - $ -
 Direct Sales to East Affiliates   126,737   -   115,120   124   3,535
 Direct Sales to West Affiliates   1,492   908   1,936   10,624   43,714
 Direct Sales to AEPEP   -   -   -   -   (637)
 Transmission Agreement and Transmission                
  Coordination Agreement Sales   2,348   9,379   3,375   111   8,962
 Natural Gas Contracts with AEPES   154   92   196   3   4
 Other Revenues   42,283   1,469   33,669   3,330   2,037
 Total Affiliated Revenues $ 359,802 $ 320,184 $ 977,999 $ 14,192 $ 57,615

Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2010               
 Sales under Interconnection Agreement $ 158,873 $ 327,992 $ 839,441 $ - $ -
 Direct Sales to East Affiliates   123,832   -   115,406   1,210   1,248
 Direct Sales to West Affiliates   3,471   1,931   4,125   19,629   39,851
 Direct Sales to AEPEP   -   -   -   -   (286)
 Direct Sales to Transmission Companies   44   1,848   236   30   1
 Natural Gas Contracts with AEPES   (2,171)   (1,087)   (2,330)   2   3
 Other Revenues   32,158   267   34,407   2,657   11,053
 Total Affiliated Revenues $ 316,207 $ 330,951 $ 991,285 $ 23,528 $ 51,870
Affiliated Purchases
Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2012               
 Purchases under Interconnection Agreement $ 661,185 $ 147,502 $ 174,240 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   683   368
 Direct Purchases from West Affiliates   53   36   75   23,695   18,861
 Purchases from AEGCo   -   238,866   203,583   -   -
 Gas Purchases from AEPES   -   -   2,808   -   -
 Total Affiliated Purchases $ 661,238 $ 386,404 $ 380,706 $ 24,378 $ 19,229

Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2011               
 Purchases under Interconnection Agreement $ 818,943 $ 124,598 $ 326,871 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   6,378   1,184
 Direct Purchases from West Affiliates   239   147   312   43,714   10,624
 Purchases from AEGCo   -   228,739   185,741   -   -
 Gas Purchases from AEPES   -   -   2,689   -   -
 Total Affiliated Purchases $ 819,182 $ 353,484 $ 515,613 $ 50,092 $ 11,808

Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2010               
 Purchases under Interconnection Agreement $ 916,791 $ 91,129 $ 268,964 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   6,162   4,078
 Direct Purchases from West Affiliates   825   466   996   39,851   19,629
 Direct Purchases from AEGCo   -   235,740   113,801   -   -
 Gas Purchases from AEPES   -   -   2,857   -   -
 Total Affiliated Purchases $ 917,616 $ 327,335 $ 386,618 $ 46,013 $ 23,707
Transmission Coordination Agreement
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 PSO $ 12,300 $ 9,000 $ 10,600
 SWEPCo   (12,300)   (9,000)   (10,500)
Railcar Maintenance
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 88 $ 9 $ 7
 I&M   3,343   3,012   1,870
 PSO   281   542   522
 SWEPCo   2,102   2,348   1,044
Central Machine Shop
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 AEGCo $ 80 $ 102 $ 180
 I&M   1,280   2,157   2,112
 KPCo   277   298   368
 OPCo   3,838   3,684   3,665
 PSO   1,198   53   412
 SWEPCo   145   946   560
Affiliate Coal Purchases
   Year Ended
 Company December 31, 2010
   (in thousands)
 APCo $ 2,830
 I&M   1,383
 KPCo   837
 PSO   796
 SWEPCo   1,526
Affiliate Railcar Agreement
 December 31, 2012
 Billing Company
                  
 Billed Company APCo I&M OPCo PSO SWEPCo
   (in thousands)
 APCo $ - $ 2 $ 1,960 $ - $ 2
 I&M   148   -   889   48   843
 KPCo   98   -   41   -   -
 OPCo   854   170   -   5   99
 PSO   204   322   74   -   176
 SWEPCo   543   1,468   321   21   -

 December 31, 2011
 Billing Company
                  
 Billed Company APCo I&M OPCo PSO SWEPCo
   (in thousands)
 APCo $ - $ - $ 1,373 $ - $ -
 I&M   91   -   1,190   80   787
 KPCo   289   -   355   -   -
 OPCo   840   170   -   8   66
 PSO   289   842   234   -   382
 SWEPCo   12   2,662   605   91   -
Related Party Sales of Property
 Sales         
   Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 6,643 $ 3,978 $ 2,004
 I&M   3,296   441   1,842
 OPCo   4,163   12,113   8,919
 PSO   1,782   442   2,156
 SWEPCo   1,731   650   5,233
Related Party Purchases of Property
 Purchases         
   Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 2,522 $ 2,312 $ 4,732
 I&M   285   3,678   4,117
 OPCo   10,608   3,045   1,652
 PSO   1,867   475   5,146
 SWEPCo   7,266   2,993   2,612
Southwestern Electric Power Co [Member]
  
Affiliated Revenues
Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2012               
 Sales under Interconnection Agreement $ 166,733 $ 265,923 $ 643,486 $ - $ -
 Direct Sales to East Affiliates   124,519   -   136,142   34   142
 Direct Sales to West Affiliates   314   218   454   18,861   23,695
 Direct Sales to AEPEP   -   -   -   -   (583)
 Transmission Agreement and Transmission               
  Coordination Agreement Sales   (1,289)   758   26,295   8   12,338
 Natural Gas Contracts with AEPES   -   -   -   -   -
 Other Revenues   27,922   1,509   40,917   3,700   1,849
 Total Affiliated Revenues $ 318,199 $ 268,408 $ 847,294 $ 22,603 $ 37,441

Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2011               
 Sales under Interconnection Agreement $ 186,788 $ 308,336 $ 823,703 $ - $ -
 Direct Sales to East Affiliates   126,737   -   115,120   124   3,535
 Direct Sales to West Affiliates   1,492   908   1,936   10,624   43,714
 Direct Sales to AEPEP   -   -   -   -   (637)
 Transmission Agreement and Transmission                
  Coordination Agreement Sales   2,348   9,379   3,375   111   8,962
 Natural Gas Contracts with AEPES   154   92   196   3   4
 Other Revenues   42,283   1,469   33,669   3,330   2,037
 Total Affiliated Revenues $ 359,802 $ 320,184 $ 977,999 $ 14,192 $ 57,615

Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2010               
 Sales under Interconnection Agreement $ 158,873 $ 327,992 $ 839,441 $ - $ -
 Direct Sales to East Affiliates   123,832   -   115,406   1,210   1,248
 Direct Sales to West Affiliates   3,471   1,931   4,125   19,629   39,851
 Direct Sales to AEPEP   -   -   -   -   (286)
 Direct Sales to Transmission Companies   44   1,848   236   30   1
 Natural Gas Contracts with AEPES   (2,171)   (1,087)   (2,330)   2   3
 Other Revenues   32,158   267   34,407   2,657   11,053
 Total Affiliated Revenues $ 316,207 $ 330,951 $ 991,285 $ 23,528 $ 51,870
Affiliated Purchases
Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2012               
 Purchases under Interconnection Agreement $ 661,185 $ 147,502 $ 174,240 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   683   368
 Direct Purchases from West Affiliates   53   36   75   23,695   18,861
 Purchases from AEGCo   -   238,866   203,583   -   -
 Gas Purchases from AEPES   -   -   2,808   -   -
 Total Affiliated Purchases $ 661,238 $ 386,404 $ 380,706 $ 24,378 $ 19,229

Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2011               
 Purchases under Interconnection Agreement $ 818,943 $ 124,598 $ 326,871 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   6,378   1,184
 Direct Purchases from West Affiliates   239   147   312   43,714   10,624
 Purchases from AEGCo   -   228,739   185,741   -   -
 Gas Purchases from AEPES   -   -   2,689   -   -
 Total Affiliated Purchases $ 819,182 $ 353,484 $ 515,613 $ 50,092 $ 11,808

Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2010               
 Purchases under Interconnection Agreement $ 916,791 $ 91,129 $ 268,964 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   6,162   4,078
 Direct Purchases from West Affiliates   825   466   996   39,851   19,629
 Direct Purchases from AEGCo   -   235,740   113,801   -   -
 Gas Purchases from AEPES   -   -   2,857   -   -
 Total Affiliated Purchases $ 917,616 $ 327,335 $ 386,618 $ 46,013 $ 23,707
Transmission Coordination Agreement
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 PSO $ 12,300 $ 9,000 $ 10,600
 SWEPCo   (12,300)   (9,000)   (10,500)
Railcar Maintenance
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 88 $ 9 $ 7
 I&M   3,343   3,012   1,870
 PSO   281   542   522
 SWEPCo   2,102   2,348   1,044
Central Machine Shop
    Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 AEGCo $ 80 $ 102 $ 180
 I&M   1,280   2,157   2,112
 KPCo   277   298   368
 OPCo   3,838   3,684   3,665
 PSO   1,198   53   412
 SWEPCo   145   946   560
Affiliate Coal Purchases
   Year Ended
 Company December 31, 2010
   (in thousands)
 APCo $ 2,830
 I&M   1,383
 KPCo   837
 PSO   796
 SWEPCo   1,526
Affiliate Railcar Agreement
 December 31, 2012
 Billing Company
                  
 Billed Company APCo I&M OPCo PSO SWEPCo
   (in thousands)
 APCo $ - $ 2 $ 1,960 $ - $ 2
 I&M   148   -   889   48   843
 KPCo   98   -   41   -   -
 OPCo   854   170   -   5   99
 PSO   204   322   74   -   176
 SWEPCo   543   1,468   321   21   -

 December 31, 2011
 Billing Company
                  
 Billed Company APCo I&M OPCo PSO SWEPCo
   (in thousands)
 APCo $ - $ - $ 1,373 $ - $ -
 I&M   91   -   1,190   80   787
 KPCo   289   -   355   -   -
 OPCo   840   170   -   8   66
 PSO   289   842   234   -   382
 SWEPCo   12   2,662   605   91   -
Related Party Sales of Property
 Sales         
   Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 6,643 $ 3,978 $ 2,004
 I&M   3,296   441   1,842
 OPCo   4,163   12,113   8,919
 PSO   1,782   442   2,156
 SWEPCo   1,731   650   5,233
Related Party Purchases of Property
 Purchases         
   Years Ended December 31,
 Company 2012 2011 2010
   (in thousands)
 APCo $ 2,522 $ 2,312 $ 4,732
 I&M   285   3,678   4,117
 OPCo   10,608   3,045   1,652
 PSO   1,867   475   5,146
 SWEPCo   7,266   2,993   2,612