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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2013
Appalachian Power Co [Member]
  
Affiliated Revenues
Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2013               
 Sales under Interconnection Agreement $ 193,651 $ 218,164 $ 924,313 $ - $ -
 Direct Sales to East Affiliates   129,014   -   152,689   14   1
 Direct Sales to West Affiliates   578   391   804   10,761   35,410
 Direct Sales to AEPEP   -   -   -   -   (136)
 Transmission Agreement and Transmission               
  Coordination Agreement Sales   461   (681)   53,405   -   14,715
 Other Revenues   23,780   1,525   35,643   3,471   1,822
 Total Affiliated Revenues $ 347,484 $ 219,399 $ 1,166,854 $ 14,246 $ 51,812

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
 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
Affiliated Purchases
Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2013               
 Purchases under Interconnection Agreement $ 830,954 $ 181,688 $ 199,283 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   1,481   411
 Direct Purchases from West Affiliates   5   3   6   35,410   10,761
 Purchases from AEGCo   -   251,518   148,459   -   -
 Natural Gas Purchases from AEPES   -   -   1,984   -   -
 Total Affiliated Purchases $ 830,959 $ 433,209 $ 349,732 $ 36,891 $ 11,172

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   -   -
 Natural 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   -   -
 Natural Gas Purchases from AEPES   -   -   2,689   -   -
 Total Affiliated Purchases $ 819,182 $ 353,484 $ 515,613 $ 50,092 $ 11,808
Transmission Agreement
    Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 APCo $ 40,609 $ 20,264 $ 4,608
 I&M   19,947   5,689   1,538
 OPCo   8,946   6,090   17,186
Coal Transloading
 AEGCo      
     Year Ended 
     December 31, 
  Company 2013 
    (in thousands) 
  I&M $ 6,820 
  OPCo   322 

 OPCo          
    Years Ended December 31, 
 Company 2013 2012 2011 
   (in thousands) 
 APCo $ (11)(a)$ 942 $ 31 
 I&M   15,596(b)  32,639(b)  21,852(b)

(a)              Includes annual true-up of 2012 estimated revenues.

(b)       Includes $7.3 million, $14.5 million and $9.3 million in 2013, 2012 and 2011, respectively, of amounts purchased by I&M on behalf of AEGCo for Rockport Plant through July 31, 2013.
Railcar Maintenance
 AEGCo      
     Year Ended 
     December 31, 
  Company 2013 
    (in thousands) 
  I&M $ 1,073 
  OPCo   41 
  PSO   106 
  SWEPCo   1,237 

 OPCo          
    Years Ended December 31, 
 Company 2013 2012 2011 
   (in thousands) 
 APCo $ 3 $ 88 $ 9 
 I&M   1,285(a)  3,343(a)  3,012(a)
 PSO   59   281   542 
 SWEPCo   1,204   2,102   2,348 

(a)        Includes $608 thousand, $1.5 million and $1.3 million in 2013, 2012 and 2011, respectively, of amounts purchased by I&M on behalf of AEGCo for Rockport Plant through July 31, 2013.
Barging, Urea Transloading and Other Services
    Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 AEGCo $ 19,719 $ 19,961 $ 15,460
 APCo   30,876   34,725   27,455
 KPCo   50   74   122
 OPCo   40,562   39,956   36,980
 AEP River Operations LLC – (Nonutility         
  Subsidiary of AEP)   22,648   20,917   25,356
Central Machine Shop
    Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 AEGCo $ 26 $ 80 $ 102
 I&M   2,451   1,280   2,157
 KPCo   687   277   298
 OPCo   4,679   3,838   3,684
 PSO   606   1,198   53
 SWEPCo   168   145   946
Affiliate Railcar Agreement
 December 31, 2013
 Billing Company
                  
 Billed Company AGR APCo I&M PSO SWEPCo
      (in thousands)
 AGR $ - $ 698 $ 33 $ 2 $ 19
 APCo   775   -   -   -   -
 I&M   (391)   507   -   195   854
 PSO   (90)   20   595   -   329
 SWEPCo   (245)   140   1,395   43   -

 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   -
Ownership and Investment in OVEC
    December 31, 2013
 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 2013 2012 2011
   (in thousands)
 APCo $ 104,396 $ 98,417 $ 114,311
 I&M   52,230   49,239   57,192
 OPCo   132,607   125,013   145,207
Purchases from OVEC under Interconnection Agreement
    Year Ended
 Company December 31, 2011
   (in thousands)
 APCo $ 21,110
 I&M   12,942
 OPCo   27,566
Related Party Sales of Property
 Sales         
   Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 APCo $ 3,212 $ 6,643 $ 3,978
 I&M   5,031   3,296   441
 OPCo   59,818   4,163   12,113
 PSO   5,651   1,782   442
 SWEPCo   1,617   1,731   650
Related Party Purchases of Property
 Purchases         
   Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 APCo $ 5,199 $ 2,522 $ 2,312
 I&M   964   285   3,678
 OPCo   5,311   10,608   3,045
 PSO   1,710   1,867   475
 SWEPCo   8,440   7,266   2,993
Indiana Michigan Power Co [Member]
  
Affiliated Revenues
Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2013               
 Sales under Interconnection Agreement $ 193,651 $ 218,164 $ 924,313 $ - $ -
 Direct Sales to East Affiliates   129,014   -   152,689   14   1
 Direct Sales to West Affiliates   578   391   804   10,761   35,410
 Direct Sales to AEPEP   -   -   -   -   (136)
 Transmission Agreement and Transmission               
  Coordination Agreement Sales   461   (681)   53,405   -   14,715
 Other Revenues   23,780   1,525   35,643   3,471   1,822
 Total Affiliated Revenues $ 347,484 $ 219,399 $ 1,166,854 $ 14,246 $ 51,812

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
 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
Affiliated Purchases
Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2013               
 Purchases under Interconnection Agreement $ 830,954 $ 181,688 $ 199,283 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   1,481   411
 Direct Purchases from West Affiliates   5   3   6   35,410   10,761
 Purchases from AEGCo   -   251,518   148,459   -   -
 Natural Gas Purchases from AEPES   -   -   1,984   -   -
 Total Affiliated Purchases $ 830,959 $ 433,209 $ 349,732 $ 36,891 $ 11,172

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   -   -
 Natural 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   -   -
 Natural Gas Purchases from AEPES   -   -   2,689   -   -
 Total Affiliated Purchases $ 819,182 $ 353,484 $ 515,613 $ 50,092 $ 11,808
Transmission Agreement
    Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 APCo $ 40,609 $ 20,264 $ 4,608
 I&M   19,947   5,689   1,538
 OPCo   8,946   6,090   17,186
Coal Transloading
 AEGCo      
     Year Ended 
     December 31, 
  Company 2013 
    (in thousands) 
  I&M $ 6,820 
  OPCo   322 

 OPCo          
    Years Ended December 31, 
 Company 2013 2012 2011 
   (in thousands) 
 APCo $ (11)(a)$ 942 $ 31 
 I&M   15,596(b)  32,639(b)  21,852(b)

(a)              Includes annual true-up of 2012 estimated revenues.

(b)       Includes $7.3 million, $14.5 million and $9.3 million in 2013, 2012 and 2011, respectively, of amounts purchased by I&M on behalf of AEGCo for Rockport Plant through July 31, 2013.
Railcar Maintenance
 AEGCo      
     Year Ended 
     December 31, 
  Company 2013 
    (in thousands) 
  I&M $ 1,073 
  OPCo   41 
  PSO   106 
  SWEPCo   1,237 

 OPCo          
    Years Ended December 31, 
 Company 2013 2012 2011 
   (in thousands) 
 APCo $ 3 $ 88 $ 9 
 I&M   1,285(a)  3,343(a)  3,012(a)
 PSO   59   281   542 
 SWEPCo   1,204   2,102   2,348 

(a)        Includes $608 thousand, $1.5 million and $1.3 million in 2013, 2012 and 2011, respectively, of amounts purchased by I&M on behalf of AEGCo for Rockport Plant through July 31, 2013.
Barging, Urea Transloading and Other Services
    Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 AEGCo $ 19,719 $ 19,961 $ 15,460
 APCo   30,876   34,725   27,455
 KPCo   50   74   122
 OPCo   40,562   39,956   36,980
 AEP River Operations LLC – (Nonutility         
  Subsidiary of AEP)   22,648   20,917   25,356
Central Machine Shop
    Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 AEGCo $ 26 $ 80 $ 102
 I&M   2,451   1,280   2,157
 KPCo   687   277   298
 OPCo   4,679   3,838   3,684
 PSO   606   1,198   53
 SWEPCo   168   145   946
Affiliate Railcar Agreement
 December 31, 2013
 Billing Company
                  
 Billed Company AGR APCo I&M PSO SWEPCo
      (in thousands)
 AGR $ - $ 698 $ 33 $ 2 $ 19
 APCo   775   -   -   -   -
 I&M   (391)   507   -   195   854
 PSO   (90)   20   595   -   329
 SWEPCo   (245)   140   1,395   43   -

 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   -
Ownership and Investment in OVEC
    December 31, 2013
 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 2013 2012 2011
   (in thousands)
 APCo $ 104,396 $ 98,417 $ 114,311
 I&M   52,230   49,239   57,192
 OPCo   132,607   125,013   145,207
Purchases from OVEC under Interconnection Agreement
    Year Ended
 Company December 31, 2011
   (in thousands)
 APCo $ 21,110
 I&M   12,942
 OPCo   27,566
Related Party Sales of Property
 Sales         
   Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 APCo $ 3,212 $ 6,643 $ 3,978
 I&M   5,031   3,296   441
 OPCo   59,818   4,163   12,113
 PSO   5,651   1,782   442
 SWEPCo   1,617   1,731   650
Related Party Purchases of Property
 Purchases         
   Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 APCo $ 5,199 $ 2,522 $ 2,312
 I&M   964   285   3,678
 OPCo   5,311   10,608   3,045
 PSO   1,710   1,867   475
 SWEPCo   8,440   7,266   2,993
Ohio Power Co [Member]
  
Affiliated Revenues
Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2013               
 Sales under Interconnection Agreement $ 193,651 $ 218,164 $ 924,313 $ - $ -
 Direct Sales to East Affiliates   129,014   -   152,689   14   1
 Direct Sales to West Affiliates   578   391   804   10,761   35,410
 Direct Sales to AEPEP   -   -   -   -   (136)
 Transmission Agreement and Transmission               
  Coordination Agreement Sales   461   (681)   53,405   -   14,715
 Other Revenues   23,780   1,525   35,643   3,471   1,822
 Total Affiliated Revenues $ 347,484 $ 219,399 $ 1,166,854 $ 14,246 $ 51,812

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
 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
Affiliated Purchases
Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2013               
 Purchases under Interconnection Agreement $ 830,954 $ 181,688 $ 199,283 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   1,481   411
 Direct Purchases from West Affiliates   5   3   6   35,410   10,761
 Purchases from AEGCo   -   251,518   148,459   -   -
 Natural Gas Purchases from AEPES   -   -   1,984   -   -
 Total Affiliated Purchases $ 830,959 $ 433,209 $ 349,732 $ 36,891 $ 11,172

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   -   -
 Natural 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   -   -
 Natural Gas Purchases from AEPES   -   -   2,689   -   -
 Total Affiliated Purchases $ 819,182 $ 353,484 $ 515,613 $ 50,092 $ 11,808
Transmission Agreement
    Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 APCo $ 40,609 $ 20,264 $ 4,608
 I&M   19,947   5,689   1,538
 OPCo   8,946   6,090   17,186
Coal Transloading
 AEGCo      
     Year Ended 
     December 31, 
  Company 2013 
    (in thousands) 
  I&M $ 6,820 
  OPCo   322 

 OPCo          
    Years Ended December 31, 
 Company 2013 2012 2011 
   (in thousands) 
 APCo $ (11)(a)$ 942 $ 31 
 I&M   15,596(b)  32,639(b)  21,852(b)

(a)              Includes annual true-up of 2012 estimated revenues.

(b)       Includes $7.3 million, $14.5 million and $9.3 million in 2013, 2012 and 2011, respectively, of amounts purchased by I&M on behalf of AEGCo for Rockport Plant through July 31, 2013.
Railcar Maintenance
 AEGCo      
     Year Ended 
     December 31, 
  Company 2013 
    (in thousands) 
  I&M $ 1,073 
  OPCo   41 
  PSO   106 
  SWEPCo   1,237 

 OPCo          
    Years Ended December 31, 
 Company 2013 2012 2011 
   (in thousands) 
 APCo $ 3 $ 88 $ 9 
 I&M   1,285(a)  3,343(a)  3,012(a)
 PSO   59   281   542 
 SWEPCo   1,204   2,102   2,348 

(a)        Includes $608 thousand, $1.5 million and $1.3 million in 2013, 2012 and 2011, respectively, of amounts purchased by I&M on behalf of AEGCo for Rockport Plant through July 31, 2013.
Barging, Urea Transloading and Other Services
    Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 AEGCo $ 19,719 $ 19,961 $ 15,460
 APCo   30,876   34,725   27,455
 KPCo   50   74   122
 OPCo   40,562   39,956   36,980
 AEP River Operations LLC – (Nonutility         
  Subsidiary of AEP)   22,648   20,917   25,356
Central Machine Shop
    Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 AEGCo $ 26 $ 80 $ 102
 I&M   2,451   1,280   2,157
 KPCo   687   277   298
 OPCo   4,679   3,838   3,684
 PSO   606   1,198   53
 SWEPCo   168   145   946
Affiliate Railcar Agreement
 December 31, 2013
 Billing Company
                  
 Billed Company AGR APCo I&M PSO SWEPCo
      (in thousands)
 AGR $ - $ 698 $ 33 $ 2 $ 19
 APCo   775   -   -   -   -
 I&M   (391)   507   -   195   854
 PSO   (90)   20   595   -   329
 SWEPCo   (245)   140   1,395   43   -

 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   -
Ownership and Investment in OVEC
    December 31, 2013
 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 2013 2012 2011
   (in thousands)
 APCo $ 104,396 $ 98,417 $ 114,311
 I&M   52,230   49,239   57,192
 OPCo   132,607   125,013   145,207
Purchases from OVEC under Interconnection Agreement
    Year Ended
 Company December 31, 2011
   (in thousands)
 APCo $ 21,110
 I&M   12,942
 OPCo   27,566
Related Party Sales of Property
 Sales         
   Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 APCo $ 3,212 $ 6,643 $ 3,978
 I&M   5,031   3,296   441
 OPCo   59,818   4,163   12,113
 PSO   5,651   1,782   442
 SWEPCo   1,617   1,731   650
Related Party Purchases of Property
 Purchases         
   Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 APCo $ 5,199 $ 2,522 $ 2,312
 I&M   964   285   3,678
 OPCo   5,311   10,608   3,045
 PSO   1,710   1,867   475
 SWEPCo   8,440   7,266   2,993
Public Service Co of Oklahoma [Member]
  
Affiliated Revenues
Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2013               
 Sales under Interconnection Agreement $ 193,651 $ 218,164 $ 924,313 $ - $ -
 Direct Sales to East Affiliates   129,014   -   152,689   14   1
 Direct Sales to West Affiliates   578   391   804   10,761   35,410
 Direct Sales to AEPEP   -   -   -   -   (136)
 Transmission Agreement and Transmission               
  Coordination Agreement Sales   461   (681)   53,405   -   14,715
 Other Revenues   23,780   1,525   35,643   3,471   1,822
 Total Affiliated Revenues $ 347,484 $ 219,399 $ 1,166,854 $ 14,246 $ 51,812

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
 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
Affiliated Purchases
Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2013               
 Purchases under Interconnection Agreement $ 830,954 $ 181,688 $ 199,283 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   1,481   411
 Direct Purchases from West Affiliates   5   3   6   35,410   10,761
 Purchases from AEGCo   -   251,518   148,459   -   -
 Natural Gas Purchases from AEPES   -   -   1,984   -   -
 Total Affiliated Purchases $ 830,959 $ 433,209 $ 349,732 $ 36,891 $ 11,172

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   -   -
 Natural 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   -   -
 Natural Gas Purchases from AEPES   -   -   2,689   -   -
 Total Affiliated Purchases $ 819,182 $ 353,484 $ 515,613 $ 50,092 $ 11,808
Transmission Coordination Agreement
    Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 PSO $ 14,700 $ 12,300 $ 9,000
 SWEPCo   (14,700)   (12,300)   (9,000)
Coal Transloading
 AEGCo      
     Year Ended 
     December 31, 
  Company 2013 
    (in thousands) 
  I&M $ 6,820 
  OPCo   322 

 OPCo          
    Years Ended December 31, 
 Company 2013 2012 2011 
   (in thousands) 
 APCo $ (11)(a)$ 942 $ 31 
 I&M   15,596(b)  32,639(b)  21,852(b)

(a)              Includes annual true-up of 2012 estimated revenues.

(b)       Includes $7.3 million, $14.5 million and $9.3 million in 2013, 2012 and 2011, respectively, of amounts purchased by I&M on behalf of AEGCo for Rockport Plant through July 31, 2013.
Railcar Maintenance
 AEGCo      
     Year Ended 
     December 31, 
  Company 2013 
    (in thousands) 
  I&M $ 1,073 
  OPCo   41 
  PSO   106 
  SWEPCo   1,237 

 OPCo          
    Years Ended December 31, 
 Company 2013 2012 2011 
   (in thousands) 
 APCo $ 3 $ 88 $ 9 
 I&M   1,285(a)  3,343(a)  3,012(a)
 PSO   59   281   542 
 SWEPCo   1,204   2,102   2,348 

(a)        Includes $608 thousand, $1.5 million and $1.3 million in 2013, 2012 and 2011, respectively, of amounts purchased by I&M on behalf of AEGCo for Rockport Plant through July 31, 2013.
Central Machine Shop
    Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 AEGCo $ 26 $ 80 $ 102
 I&M   2,451   1,280   2,157
 KPCo   687   277   298
 OPCo   4,679   3,838   3,684
 PSO   606   1,198   53
 SWEPCo   168   145   946
Affiliate Railcar Agreement
 December 31, 2013
 Billing Company
                  
 Billed Company AGR APCo I&M PSO SWEPCo
      (in thousands)
 AGR $ - $ 698 $ 33 $ 2 $ 19
 APCo   775   -   -   -   -
 I&M   (391)   507   -   195   854
 PSO   (90)   20   595   -   329
 SWEPCo   (245)   140   1,395   43   -

 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   -
Related Party Sales of Property
 Sales         
   Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 APCo $ 3,212 $ 6,643 $ 3,978
 I&M   5,031   3,296   441
 OPCo   59,818   4,163   12,113
 PSO   5,651   1,782   442
 SWEPCo   1,617   1,731   650
Related Party Purchases of Property
 Purchases         
   Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 APCo $ 5,199 $ 2,522 $ 2,312
 I&M   964   285   3,678
 OPCo   5,311   10,608   3,045
 PSO   1,710   1,867   475
 SWEPCo   8,440   7,266   2,993
Southwestern Electric Power Co [Member]
  
Affiliated Revenues
Related Party Revenues APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2013               
 Sales under Interconnection Agreement $ 193,651 $ 218,164 $ 924,313 $ - $ -
 Direct Sales to East Affiliates   129,014   -   152,689   14   1
 Direct Sales to West Affiliates   578   391   804   10,761   35,410
 Direct Sales to AEPEP   -   -   -   -   (136)
 Transmission Agreement and Transmission               
  Coordination Agreement Sales   461   (681)   53,405   -   14,715
 Other Revenues   23,780   1,525   35,643   3,471   1,822
 Total Affiliated Revenues $ 347,484 $ 219,399 $ 1,166,854 $ 14,246 $ 51,812

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
 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
Affiliated Purchases
Related Party Purchases APCo I&M OPCo PSO SWEPCo
     (in thousands)
Year Ended December 31, 2013               
 Purchases under Interconnection Agreement $ 830,954 $ 181,688 $ 199,283 $ - $ -
 Direct Purchases from East Affiliates   -   -   -   1,481   411
 Direct Purchases from West Affiliates   5   3   6   35,410   10,761
 Purchases from AEGCo   -   251,518   148,459   -   -
 Natural Gas Purchases from AEPES   -   -   1,984   -   -
 Total Affiliated Purchases $ 830,959 $ 433,209 $ 349,732 $ 36,891 $ 11,172

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   -   -
 Natural 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   -   -
 Natural Gas Purchases from AEPES   -   -   2,689   -   -
 Total Affiliated Purchases $ 819,182 $ 353,484 $ 515,613 $ 50,092 $ 11,808
Transmission Coordination Agreement
    Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 PSO $ 14,700 $ 12,300 $ 9,000
 SWEPCo   (14,700)   (12,300)   (9,000)
Coal Transloading
 AEGCo      
     Year Ended 
     December 31, 
  Company 2013 
    (in thousands) 
  I&M $ 6,820 
  OPCo   322 

 OPCo          
    Years Ended December 31, 
 Company 2013 2012 2011 
   (in thousands) 
 APCo $ (11)(a)$ 942 $ 31 
 I&M   15,596(b)  32,639(b)  21,852(b)

(a)              Includes annual true-up of 2012 estimated revenues.

(b)       Includes $7.3 million, $14.5 million and $9.3 million in 2013, 2012 and 2011, respectively, of amounts purchased by I&M on behalf of AEGCo for Rockport Plant through July 31, 2013.
Railcar Maintenance
 AEGCo      
     Year Ended 
     December 31, 
  Company 2013 
    (in thousands) 
  I&M $ 1,073 
  OPCo   41 
  PSO   106 
  SWEPCo   1,237 

 OPCo          
    Years Ended December 31, 
 Company 2013 2012 2011 
   (in thousands) 
 APCo $ 3 $ 88 $ 9 
 I&M   1,285(a)  3,343(a)  3,012(a)
 PSO   59   281   542 
 SWEPCo   1,204   2,102   2,348 

(a)        Includes $608 thousand, $1.5 million and $1.3 million in 2013, 2012 and 2011, respectively, of amounts purchased by I&M on behalf of AEGCo for Rockport Plant through July 31, 2013.
Central Machine Shop
    Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 AEGCo $ 26 $ 80 $ 102
 I&M   2,451   1,280   2,157
 KPCo   687   277   298
 OPCo   4,679   3,838   3,684
 PSO   606   1,198   53
 SWEPCo   168   145   946
Affiliate Railcar Agreement
 December 31, 2013
 Billing Company
                  
 Billed Company AGR APCo I&M PSO SWEPCo
      (in thousands)
 AGR $ - $ 698 $ 33 $ 2 $ 19
 APCo   775   -   -   -   -
 I&M   (391)   507   -   195   854
 PSO   (90)   20   595   -   329
 SWEPCo   (245)   140   1,395   43   -

 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   -
Related Party Sales of Property
 Sales         
   Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 APCo $ 3,212 $ 6,643 $ 3,978
 I&M   5,031   3,296   441
 OPCo   59,818   4,163   12,113
 PSO   5,651   1,782   442
 SWEPCo   1,617   1,731   650
Related Party Purchases of Property
 Purchases         
   Years Ended December 31,
 Company 2013 2012 2011
   (in thousands)
 APCo $ 5,199 $ 2,522 $ 2,312
 I&M   964   285   3,678
 OPCo   5,311   10,608   3,045
 PSO   1,710   1,867   475
 SWEPCo   8,440   7,266   2,993