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Financing Activities (Tables)
 6 Months Ended
Jun. 30, 2013
Long-term Debt
 Type of Debt June 30, 2013 December 31, 2012
   (in millions)
 Senior Unsecured Notes $ 12,458 $ 12,712
 Pollution Control Bonds   1,982   1,958
 Notes Payable   462   427
 Securitization Bonds   2,150   2,281
 Spent Nuclear Fuel Obligation (a)   265   265
 Other Long-term Debt    338   140
 Fair Value of Interest Rate Hedges   (10)   3
 Unamortized Discount, Net   (27)   (29)
 Total Long-term Debt Outstanding   17,618   17,757
 Long-term Debt Due Within One Year   1,819   2,171
 Long-term Debt  $ 15,799 $ 15,586

(a)       Pursuant to the Nuclear Waste Policy Act of 1982, I&M, a nuclear licensee, has an obligation to the United States Department of Energy for spent nuclear fuel disposal. The obligation includes a one-time fee for nuclear fuel consumed prior to April 7, 1983. Trust fund assets related to this obligation were $308 million and $308 million as of June 30, 2013 and December 31, 2012, respectively, and are included in Spent Nuclear Fuel and Decommissioning Trusts on our condensed balance sheets.

 
Long-term Debt Issuances
      Principal   Interest  
 Company Type of Debt Amount  Rate Due Date
 Issuances:  (in millions) (%)  
 AEP  Other Long-term Debt $ 200(a) Variable 2015
 I&M  Senior Unsecured Notes   250  3.20 2023
 I&M Notes Payable   101  Variable 2017
 OPCo Pollution Control Bonds  50  Variable 2014
             
 Non-Registrant:          
 AEPTCo Senior Unsecured Notes   25  4.83 2043
 TCC Pollution Control Bonds  120  4.00 2030
 TNC  Senior Unsecured Notes   125  3.09 2023
 TNC  Senior Unsecured Notes   75  4.48 2043
 Total Issuances   $ 946(b)    

(a)       Draw on a $1 billion term credit facility due in May 2015.

(b)       Amount indicated on the statement of cash flows is net of issuance costs and premium or discount and will not tie to the total issuances.
Retirements and Principal Payments
      Principal   Interest  
 Company Type of Debt Amount Paid  Rate Due Date
 Retirements and   (in millions) (%)  
  Principal Payments:          
 I&M Notes Payable $ 6  5.44 2013
 I&M Notes Payable   10  4.00 2014
 I&M Notes Payable   8  Variable 2015
 I&M Notes Payable   10  Variable 2016
 I&M Notes Payable   7  2.12 2016
 I&M Notes Payable   21  Variable 2016
 I&M Pollution Control Bonds   40  5.25 2025
 I&M Other Long-term Debt   2  Variable 2015
 OPCo Senior Unsecured Notes   250  5.50 2013
 OPCo Senior Unsecured Notes   250  5.50 2013
 OPCo Pollution Control Bonds   56  5.10 2013
 OPCo Pollution Control Bonds   50  5.15 2026
 SWEPCo Notes Payable   1  4.58 2032
             
 Non-Registrant:          
 AEP Subsidiaries Notes Payable   1  Variable 2017
 AEP Subsidiaries Notes Payable   1  7.59 - 8.03 2026
 AEGCo Senior Unsecured Notes   4  6.33 2037
 TCC Securitization Bonds   67  4.98 2013
 TCC Securitization Bonds   38  5.96 2013
 TCC Securitization Bonds   26  0.88 2017
 TNC Senior Unsecured Notes   225  5.50 2013
 Total Retirements and          
  Principal Payments   $ 1,073     
Short Term Debt
Short-term Debt            
               
Our outstanding short-term debt was as follows:           
               
    June 30, 2013 December 31, 2012
    Outstanding Interest Outstanding Interest
 Type of DebtAmountRate (a) AmountRate (a)
   (in millions)    (in millions)   
 Securitized Debt for Receivables (b) $ 688  0.23% $ 657  0.26%
 Commercial Paper   850  0.32%   321  0.42%
 Line of Credit – Sabine (c)   -  -%   3  1.82%
 Total Short-term Debt $ 1,538    $ 981   

(a)       Weighted average rate.

(b)       Amount of securitized debt for receivables as accounted for under the ''Transfers and Servicing'' accounting guidance.

(c)       This line of credit does not reduce available liquidity under AEP's credit facilities.
Comparative Accounts Receivable Information
    Three Months Ended  Six Months Ended  
    June 30, June 30, 
    2013 2012 2013 2012 
   (dollars in millions) 
 Effective Interest Rates on Securitization of             
  Accounts Receivable   0.22%  0.26%  0.23%  0.26%
 Net Uncollectible Accounts Receivable             
  Written Off $ 7 $ 6 $ 14 $ 14 
Customer Accounts Receivable Managed Portfolio
    June 30, December 31,
    2013 2012
    (in millions)
 Accounts Receivable Retained Interest and Pledged as Collateral      
  Less Uncollectible Accounts $ 954 $ 835
 Total Principal Outstanding   688   657
 Delinquent Securitized Accounts Receivable   45   37
 Bad Debt Reserves Related to Securitization/Sale of Accounts Receivable   21   21
 Unbilled Receivables Related to Securitization/Sale of Accounts Receivable   369   316
Appalachian Power Co [Member]
  
Retirements and Principal Payments
      Principal  Interest  
 Company Type of Debt Amount Paid Rate Due Date
 Retirements and   (in thousands) (%)  
  Principal Payments:         
 APCo Land Note $ 14 13.718 2026
 I&M Notes Payable   6,083 5.44 2013
 I&M Notes Payable   9,811 4.00 2014
 I&M Notes Payable   8,054 Variable 2015
 I&M Notes Payable   9,731 Variable 2016
 I&M Notes Payable   6,739 2.12 2016
 I&M Notes Payable   20,859 Variable 2016
 I&M Other Long-term Debt   454 6.00 2025
 I&M Other Long-term Debt   2,062 Variable 2015
 I&M Pollution Control Bonds   40,000 5.25 2025
 OPCo Pollution Control Bonds   56,000 5.10 2013
 OPCo Pollution Control Bonds   50,000 5.15 2026
 OPCo Senior Unsecured Notes   250,000 5.50 2013
 OPCo Senior Unsecured Notes   250,000 5.50 2013
 PSO Notes Payable   200 3.00 2027
 SWEPCo Notes Payable   1,625 4.58 2032
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
               Net   
               Loans to   
   Maximum Maximum Average Average (Borrowings from) Authorized
   Borrowings Loans  Borrowings Loans  the Utility Short-term
   from the Utility to the Utility from the Utility to the Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool June 30, 2013 Limit
   (in thousands)
 APCo $ 217,174 $ 23,871 $ 100,093 $ 23,478 $ (64,480) $ 600,000
 I&M   23,135   355,659   8,308   198,197   273,117   500,000
 OPCo   410,456   169,284   241,993   31,664   (281,672)   600,000
 PSO   46,806   25,343   20,136   11,603   (25,276)   300,000
 SWEPCo   15,386   153,830   4,473   49,757   14,806   350,000
Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool
   Six Months Ended June 30,
   2013 2012
 Maximum Interest Rate  0.43%  0.56%
 Minimum Interest Rate  0.32%  0.45%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
   Average Interest Rate  Average Interest Rate
   for Funds Borrowed   for Funds Loaned
   from the Utility Money Pool for   to the Utility Money Pool for
   Six Months Ended June 30, Six Months Ended June 30,
 Company 2013 20122013 2012
 APCo  0.36%  0.49%  0.36%  0.49%
 I&M  0.36%  -%  0.35%  0.49%
 OPCo  0.35%  0.47%  0.37%  0.51%
 PSO  0.34%  -%  0.38%  0.48%
 SWEPCo  0.34%  0.53%  0.37%  0.48%
Accounts Receivable and Accrued Unbilled Revenues
    June 30, December 31,
 Company 2013 2012
    (in thousands)
 APCo $ 146,352 $ 153,719
 I&M   139,932   123,447
 OPCo   339,389   300,675
 PSO   127,497   85,530
 SWEPCo   166,278   132,449
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
    Three Months Ended June 30, Six Months Ended June 30,
 Company 2013 2012 2013 2012
    (in thousands)
 APCo $ 1,459 $ 1,556 $ 3,015 $ 3,686
 I&M   1,530   1,521   2,982   3,064
 OPCo   4,695   4,622   9,364   10,538
 PSO   1,351   1,825   2,765   3,557
 SWEPCo   1,384   1,548   2,764   2,934
Proceeds on Sale of Receivables to AEP Credit
    Three Months Ended June 30, Six Months Ended June 30,
 Company 2013 2012 2013 2012
    (in thousands)
 APCo $ 342,984 $ 295,879 $ 741,177 $ 642,405
 I&M   361,417   320,415   713,247   659,996
 OPCo   661,959   656,737   1,358,917   1,494,634
 PSO   321,620   303,729   561,895   576,524
 SWEPCo   389,076   379,114   721,012   700,722
Indiana Michigan Power Co [Member]
  
Long-term Debt Issuances
     Principal  Interest  
 Company Type of Debt Amount (a) Rate Due Date
 Issuances:   (in thousands) (%)  
 I&M Notes Payable $ 101,354 Variable 2017
 I&M Senior Unsecured Notes   250,000 3.20 2023
 OPCo Long-term Debt - Affiliated   200,000(b)Variable 2015
 OPCo Pollution Control Bonds   50,000 Variable 2014

(a)       Amounts indicated on the statements of cash flows are net of issuance costs and premium or discount and will not tie to the issuance amounts.

(b)       Intercompany issuance from AEP consisting of a draw on a $1 billion term credit facility due in May 2015.
Retirements and Principal Payments
      Principal  Interest  
 Company Type of Debt Amount Paid Rate Due Date
 Retirements and   (in thousands) (%)  
  Principal Payments:         
 APCo Land Note $ 14 13.718 2026
 I&M Notes Payable   6,083 5.44 2013
 I&M Notes Payable   9,811 4.00 2014
 I&M Notes Payable   8,054 Variable 2015
 I&M Notes Payable   9,731 Variable 2016
 I&M Notes Payable   6,739 2.12 2016
 I&M Notes Payable   20,859 Variable 2016
 I&M Other Long-term Debt   454 6.00 2025
 I&M Other Long-term Debt   2,062 Variable 2015
 I&M Pollution Control Bonds   40,000 5.25 2025
 OPCo Pollution Control Bonds   56,000 5.10 2013
 OPCo Pollution Control Bonds   50,000 5.15 2026
 OPCo Senior Unsecured Notes   250,000 5.50 2013
 OPCo Senior Unsecured Notes   250,000 5.50 2013
 PSO Notes Payable   200 3.00 2027
 SWEPCo Notes Payable   1,625 4.58 2032
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
               Net   
               Loans to   
   Maximum Maximum Average Average (Borrowings from) Authorized
   Borrowings Loans  Borrowings Loans  the Utility Short-term
   from the Utility to the Utility from the Utility to the Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool June 30, 2013 Limit
   (in thousands)
 APCo $ 217,174 $ 23,871 $ 100,093 $ 23,478 $ (64,480) $ 600,000
 I&M   23,135   355,659   8,308   198,197   273,117   500,000
 OPCo   410,456   169,284   241,993   31,664   (281,672)   600,000
 PSO   46,806   25,343   20,136   11,603   (25,276)   300,000
 SWEPCo   15,386   153,830   4,473   49,757   14,806   350,000
Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool
   Six Months Ended June 30,
   2013 2012
 Maximum Interest Rate  0.43%  0.56%
 Minimum Interest Rate  0.32%  0.45%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
   Average Interest Rate  Average Interest Rate
   for Funds Borrowed   for Funds Loaned
   from the Utility Money Pool for   to the Utility Money Pool for
   Six Months Ended June 30, Six Months Ended June 30,
 Company 2013 20122013 2012
 APCo  0.36%  0.49%  0.36%  0.49%
 I&M  0.36%  -%  0.35%  0.49%
 OPCo  0.35%  0.47%  0.37%  0.51%
 PSO  0.34%  -%  0.38%  0.48%
 SWEPCo  0.34%  0.53%  0.37%  0.48%
Accounts Receivable and Accrued Unbilled Revenues
    June 30, December 31,
 Company 2013 2012
    (in thousands)
 APCo $ 146,352 $ 153,719
 I&M   139,932   123,447
 OPCo   339,389   300,675
 PSO   127,497   85,530
 SWEPCo   166,278   132,449
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
    Three Months Ended June 30, Six Months Ended June 30,
 Company 2013 2012 2013 2012
    (in thousands)
 APCo $ 1,459 $ 1,556 $ 3,015 $ 3,686
 I&M   1,530   1,521   2,982   3,064
 OPCo   4,695   4,622   9,364   10,538
 PSO   1,351   1,825   2,765   3,557
 SWEPCo   1,384   1,548   2,764   2,934
Proceeds on Sale of Receivables to AEP Credit
    Three Months Ended June 30, Six Months Ended June 30,
 Company 2013 2012 2013 2012
    (in thousands)
 APCo $ 342,984 $ 295,879 $ 741,177 $ 642,405
 I&M   361,417   320,415   713,247   659,996
 OPCo   661,959   656,737   1,358,917   1,494,634
 PSO   321,620   303,729   561,895   576,524
 SWEPCo   389,076   379,114   721,012   700,722
Ohio Power Co [Member]
  
Long-term Debt Issuances
     Principal  Interest  
 Company Type of Debt Amount (a) Rate Due Date
 Issuances:   (in thousands) (%)  
 I&M Notes Payable $ 101,354 Variable 2017
 I&M Senior Unsecured Notes   250,000 3.20 2023
 OPCo Long-term Debt - Affiliated   200,000(b)Variable 2015
 OPCo Pollution Control Bonds   50,000 Variable 2014

(a)       Amounts indicated on the statements of cash flows are net of issuance costs and premium or discount and will not tie to the issuance amounts.

(b)       Intercompany issuance from AEP consisting of a draw on a $1 billion term credit facility due in May 2015.
Retirements and Principal Payments
      Principal  Interest  
 Company Type of Debt Amount Paid Rate Due Date
 Retirements and   (in thousands) (%)  
  Principal Payments:         
 APCo Land Note $ 14 13.718 2026
 I&M Notes Payable   6,083 5.44 2013
 I&M Notes Payable   9,811 4.00 2014
 I&M Notes Payable   8,054 Variable 2015
 I&M Notes Payable   9,731 Variable 2016
 I&M Notes Payable   6,739 2.12 2016
 I&M Notes Payable   20,859 Variable 2016
 I&M Other Long-term Debt   454 6.00 2025
 I&M Other Long-term Debt   2,062 Variable 2015
 I&M Pollution Control Bonds   40,000 5.25 2025
 OPCo Pollution Control Bonds   56,000 5.10 2013
 OPCo Pollution Control Bonds   50,000 5.15 2026
 OPCo Senior Unsecured Notes   250,000 5.50 2013
 OPCo Senior Unsecured Notes   250,000 5.50 2013
 PSO Notes Payable   200 3.00 2027
 SWEPCo Notes Payable   1,625 4.58 2032
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
               Net   
               Loans to   
   Maximum Maximum Average Average (Borrowings from) Authorized
   Borrowings Loans  Borrowings Loans  the Utility Short-term
   from the Utility to the Utility from the Utility to the Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool June 30, 2013 Limit
   (in thousands)
 APCo $ 217,174 $ 23,871 $ 100,093 $ 23,478 $ (64,480) $ 600,000
 I&M   23,135   355,659   8,308   198,197   273,117   500,000
 OPCo   410,456   169,284   241,993   31,664   (281,672)   600,000
 PSO   46,806   25,343   20,136   11,603   (25,276)   300,000
 SWEPCo   15,386   153,830   4,473   49,757   14,806   350,000
Nonutility Money Pool Activity
             
 Maximum Maximum Average Average Borrowings 
 Borrowings Loans  Borrowings Loans  from the Nonutility 
 from the Nonutility to the Nonutility from the Nonutility to the Nonutility Money Pool as of 
 Money Pool Money Pool Money Pool Money Pool June 30, 2013 
 (in thousands)
 $ 1,047 $ 1,027 $ 115 $ 208 $ 58 
Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool
   Six Months Ended June 30,
   2013 2012
 Maximum Interest Rate  0.43%  0.56%
 Minimum Interest Rate  0.32%  0.45%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
   Average Interest Rate  Average Interest Rate
   for Funds Borrowed   for Funds Loaned
   from the Utility Money Pool for   to the Utility Money Pool for
   Six Months Ended June 30, Six Months Ended June 30,
 Company 2013 20122013 2012
 APCo  0.36%  0.49%  0.36%  0.49%
 I&M  0.36%  -%  0.35%  0.49%
 OPCo  0.35%  0.47%  0.37%  0.51%
 PSO  0.34%  -%  0.38%  0.48%
 SWEPCo  0.34%  0.53%  0.37%  0.48%
Maximum, Minimum and Average Interest Rates for Funds Borrowed from and Loaned to the Nonutility Money Pool
  Maximum Minimum Maximum Minimum Average Average
  Interest Rate Interest Rate Interest Rate Interest Rate Interest Rate Interest Rate
  for Funds for Funds for Funds for Funds for Funds for Funds
Six Months Borrowed from Borrowed from Loaned to Loaned to Borrowed from Loaned to
Ended the Nonutility the Nonutility the Nonutility the Nonutility the Nonutility the Nonutility
June 30, Money Pool Money PoolMoney Pool Money Pool Money Pool Money Pool
2013  0.61%  0.57%  0.35%  0.32%  0.61%  0.34%
Accounts Receivable and Accrued Unbilled Revenues
    June 30, December 31,
 Company 2013 2012
    (in thousands)
 APCo $ 146,352 $ 153,719
 I&M   139,932   123,447
 OPCo   339,389   300,675
 PSO   127,497   85,530
 SWEPCo   166,278   132,449
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
    Three Months Ended June 30, Six Months Ended June 30,
 Company 2013 2012 2013 2012
    (in thousands)
 APCo $ 1,459 $ 1,556 $ 3,015 $ 3,686
 I&M   1,530   1,521   2,982   3,064
 OPCo   4,695   4,622   9,364   10,538
 PSO   1,351   1,825   2,765   3,557
 SWEPCo   1,384   1,548   2,764   2,934
Proceeds on Sale of Receivables to AEP Credit
    Three Months Ended June 30, Six Months Ended June 30,
 Company 2013 2012 2013 2012
    (in thousands)
 APCo $ 342,984 $ 295,879 $ 741,177 $ 642,405
 I&M   361,417   320,415   713,247   659,996
 OPCo   661,959   656,737   1,358,917   1,494,634
 PSO   321,620   303,729   561,895   576,524
 SWEPCo   389,076   379,114   721,012   700,722
Public Service Co Of Oklahoma [Member]
  
Retirements and Principal Payments
      Principal  Interest  
 Company Type of Debt Amount Paid Rate Due Date
 Retirements and   (in thousands) (%)  
  Principal Payments:         
 APCo Land Note $ 14 13.718 2026
 I&M Notes Payable   6,083 5.44 2013
 I&M Notes Payable   9,811 4.00 2014
 I&M Notes Payable   8,054 Variable 2015
 I&M Notes Payable   9,731 Variable 2016
 I&M Notes Payable   6,739 2.12 2016
 I&M Notes Payable   20,859 Variable 2016
 I&M Other Long-term Debt   454 6.00 2025
 I&M Other Long-term Debt   2,062 Variable 2015
 I&M Pollution Control Bonds   40,000 5.25 2025
 OPCo Pollution Control Bonds   56,000 5.10 2013
 OPCo Pollution Control Bonds   50,000 5.15 2026
 OPCo Senior Unsecured Notes   250,000 5.50 2013
 OPCo Senior Unsecured Notes   250,000 5.50 2013
 PSO Notes Payable   200 3.00 2027
 SWEPCo Notes Payable   1,625 4.58 2032
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
               Net   
               Loans to   
   Maximum Maximum Average Average (Borrowings from) Authorized
   Borrowings Loans  Borrowings Loans  the Utility Short-term
   from the Utility to the Utility from the Utility to the Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool June 30, 2013 Limit
   (in thousands)
 APCo $ 217,174 $ 23,871 $ 100,093 $ 23,478 $ (64,480) $ 600,000
 I&M   23,135   355,659   8,308   198,197   273,117   500,000
 OPCo   410,456   169,284   241,993   31,664   (281,672)   600,000
 PSO   46,806   25,343   20,136   11,603   (25,276)   300,000
 SWEPCo   15,386   153,830   4,473   49,757   14,806   350,000
Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool
   Six Months Ended June 30,
   2013 2012
 Maximum Interest Rate  0.43%  0.56%
 Minimum Interest Rate  0.32%  0.45%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
   Average Interest Rate  Average Interest Rate
   for Funds Borrowed   for Funds Loaned
   from the Utility Money Pool for   to the Utility Money Pool for
   Six Months Ended June 30, Six Months Ended June 30,
 Company 2013 20122013 2012
 APCo  0.36%  0.49%  0.36%  0.49%
 I&M  0.36%  -%  0.35%  0.49%
 OPCo  0.35%  0.47%  0.37%  0.51%
 PSO  0.34%  -%  0.38%  0.48%
 SWEPCo  0.34%  0.53%  0.37%  0.48%
Accounts Receivable and Accrued Unbilled Revenues
    June 30, December 31,
 Company 2013 2012
    (in thousands)
 APCo $ 146,352 $ 153,719
 I&M   139,932   123,447
 OPCo   339,389   300,675
 PSO   127,497   85,530
 SWEPCo   166,278   132,449
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
    Three Months Ended June 30, Six Months Ended June 30,
 Company 2013 2012 2013 2012
    (in thousands)
 APCo $ 1,459 $ 1,556 $ 3,015 $ 3,686
 I&M   1,530   1,521   2,982   3,064
 OPCo   4,695   4,622   9,364   10,538
 PSO   1,351   1,825   2,765   3,557
 SWEPCo   1,384   1,548   2,764   2,934
Proceeds on Sale of Receivables to AEP Credit
    Three Months Ended June 30, Six Months Ended June 30,
 Company 2013 2012 2013 2012
    (in thousands)
 APCo $ 342,984 $ 295,879 $ 741,177 $ 642,405
 I&M   361,417   320,415   713,247   659,996
 OPCo   661,959   656,737   1,358,917   1,494,634
 PSO   321,620   303,729   561,895   576,524
 SWEPCo   389,076   379,114   721,012   700,722
Southwestern Electric Power Co [Member]
  
Retirements and Principal Payments
      Principal  Interest  
 Company Type of Debt Amount Paid Rate Due Date
 Retirements and   (in thousands) (%)  
  Principal Payments:         
 APCo Land Note $ 14 13.718 2026
 I&M Notes Payable   6,083 5.44 2013
 I&M Notes Payable   9,811 4.00 2014
 I&M Notes Payable   8,054 Variable 2015
 I&M Notes Payable   9,731 Variable 2016
 I&M Notes Payable   6,739 2.12 2016
 I&M Notes Payable   20,859 Variable 2016
 I&M Other Long-term Debt   454 6.00 2025
 I&M Other Long-term Debt   2,062 Variable 2015
 I&M Pollution Control Bonds   40,000 5.25 2025
 OPCo Pollution Control Bonds   56,000 5.10 2013
 OPCo Pollution Control Bonds   50,000 5.15 2026
 OPCo Senior Unsecured Notes   250,000 5.50 2013
 OPCo Senior Unsecured Notes   250,000 5.50 2013
 PSO Notes Payable   200 3.00 2027
 SWEPCo Notes Payable   1,625 4.58 2032
Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits
               Net   
               Loans to   
   Maximum Maximum Average Average (Borrowings from) Authorized
   Borrowings Loans  Borrowings Loans  the Utility Short-term
   from the Utility to the Utility from the Utility to the Utility Money Pool as of Borrowing
 Company Money Pool Money Pool Money Pool Money Pool June 30, 2013 Limit
   (in thousands)
 APCo $ 217,174 $ 23,871 $ 100,093 $ 23,478 $ (64,480) $ 600,000
 I&M   23,135   355,659   8,308   198,197   273,117   500,000
 OPCo   410,456   169,284   241,993   31,664   (281,672)   600,000
 PSO   46,806   25,343   20,136   11,603   (25,276)   300,000
 SWEPCo   15,386   153,830   4,473   49,757   14,806   350,000
Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool
   Six Months Ended June 30,
   2013 2012
 Maximum Interest Rate  0.43%  0.56%
 Minimum Interest Rate  0.32%  0.45%
Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool
   Average Interest Rate  Average Interest Rate
   for Funds Borrowed   for Funds Loaned
   from the Utility Money Pool for   to the Utility Money Pool for
   Six Months Ended June 30, Six Months Ended June 30,
 Company 2013 20122013 2012
 APCo  0.36%  0.49%  0.36%  0.49%
 I&M  0.36%  -%  0.35%  0.49%
 OPCo  0.35%  0.47%  0.37%  0.51%
 PSO  0.34%  -%  0.38%  0.48%
 SWEPCo  0.34%  0.53%  0.37%  0.48%
Short Term Debt
Short-term Debt            
                 
The Registrant Subsidiaries’ outstanding short-term debt was as follows:
                 
      June 30, 2013 December 31, 2012
      Outstanding Interest Outstanding Interest
 Company Type of DebtAmountRate (a) AmountRate (a)
      (in thousands)    (in thousands)   
 SWEPCo Line of Credit – Sabine $ -  -% $ 2,603  1.82%

(a) Weighted average rate.

 
Accounts Receivable and Accrued Unbilled Revenues
    June 30, December 31,
 Company 2013 2012
    (in thousands)
 APCo $ 146,352 $ 153,719
 I&M   139,932   123,447
 OPCo   339,389   300,675
 PSO   127,497   85,530
 SWEPCo   166,278   132,449
Fees Paid to AEP Credit for Customer Accounts Receivable Sold
    Three Months Ended June 30, Six Months Ended June 30,
 Company 2013 2012 2013 2012
    (in thousands)
 APCo $ 1,459 $ 1,556 $ 3,015 $ 3,686
 I&M   1,530   1,521   2,982   3,064
 OPCo   4,695   4,622   9,364   10,538
 PSO   1,351   1,825   2,765   3,557
 SWEPCo   1,384   1,548   2,764   2,934
Proceeds on Sale of Receivables to AEP Credit
    Three Months Ended June 30, Six Months Ended June 30,
 Company 2013 2012 2013 2012
    (in thousands)
 APCo $ 342,984 $ 295,879 $ 741,177 $ 642,405
 I&M   361,417   320,415   713,247   659,996
 OPCo   661,959   656,737   1,358,917   1,494,634
 PSO   321,620   303,729   561,895   576,524
 SWEPCo   389,076   379,114   721,012   700,722